ISP1122A
Universal Serial Bus stand-alone hub
Rev. 02 — 6 June 2000 Product specification
c
c
1. General description
The ISP1122A is a stand-alone Universal Serial Bus (USB) hub device which
complies with
USB Specification Rev. 1.1
. It integrates a Serial Interface Engine
(SIE), hub repeater, hub controller, USB data transceivers and a 3.3 V voltage
regulator. It has a configurable number of downstream ports, ranging from 2 to 5.
The ISP1122A can be bus-powered, self-powered or hybrid-powered. When it is
hybrid-powered the hub functions are powered by the upstream power supply (VBUS),
but the downstream ports are powered by an external 5 Volt supply. The low power
consumption in ‘suspend’ mode allows easy design of equipment that is compliant
with the ACPI™, OnNow™ and USB power management requirements.
The ISP1122A has built-in overcurrent sense inputs, supporting individual and global
overcurrent protection for downstream ports. All ports (including the hub) have
GoodLink™ indicator outputs for easy visual monitoring of USB traffic. The ISP1122A
has a serial I2C-bus interface for external EEPROM access and a reduced frequency
(6 MHz) crystal oscillator. These features allow significant cost savings in system
design and easy implementation of advanced USB functionality into PC peripherals.
2. Features
High performance USB hub device with integrated hub repeater, hub controller,
Serial Interface Engine (SIE), data transceivers and 3.3 V voltage regulator
Complies with
Universal Serial Bus Specification Rev. 1.1
and ACPI, OnNow and
USB power management requirements
Configurable from 2 to 5 downstream ports with automatic speed detection
Internal power-on reset and low voltage reset circuit
Supports bus-powered, hybrid-powered and self-powered application
Individual or ganged power switching for downstream ports
Individual or global port overcurrent protection with built-in sense circuits
6 MHz crystal oscillator with on-chip PLL for low EMI
Visual USB traffic monitoring (GoodLink™) for hub and downstream ports
I2C-bus interface to read vendor ID, product ID and configuration bits from
external EEPROM
Operation over the extended USB bus voltage range (4.0 to 5.5 V)
Operating temperature range 40 to +85 °C
8 kV in-circuit ESD protection for lower cost of external components
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 2 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Full-scan design with high test coverage
Available in 32-pin SDIP, SO and LQFP packages.
3. Ordering information
4. Block diagram
Table 1: Ordering information
Type number Package
Name Description Version
ISP1122AD SO32 plastic small outline package; 32 leads; body width 7.5 mm SOT287-1
ISP1122ANB SDIP32 plastic shrink dual in-line package; 32 leads (400 mil) SOT232-1
ISP1122ABD LQFP32 plastic low profile quad flat package; 32 leads; body 7 x 7 x 1.4 mm SOT358-1
This is a conceptual block diagram and does not include each individual signal.
Fig 1. Block diagram.
pagewidth
MBL169
I2C-BUS
INTERFACE
HUB
REPEATER
ISP1122A
ANALOG
Tx/Rx
D+Dovercurrent
detection
downstream
port 1
LED/
power switch
GoodLink/
POWER SWITCH/
OC DETECT
ANALOG
Tx/Rx
D+Dovercurrent
detection
downstream
port 2
LED/
power switch
GoodLink/
POWER SWITCH/
OC DETECT
ANALOG
Tx/Rx
D+Dovercurrent
detection
downstream
port 3
LED/
power switch
GoodLink/
POWER SWITCH/
OC DETECT
ANALOG
Tx/Rx
D+Dovercurrent
detection
downstream
port 4
LED/
power switch
GoodLink/
POWER SWITCH/
OC DETECT
ANALOG
Tx/Rx
D+D
full
speed
upstream
port
LED
HUB
GoodLink
ANALOG
Tx/Rx
D+Dovercurrent
detection
self/bus
powered
downstream
port 5
LED/
power switch
GoodLink/
POWER SWITCH/
OC DETECT
HUB
CONTROLLER
PACKET
GENERATOR
GENERAL
PORT
CONTROLLER
END OF
FRAME
TIMERS
PHILIPS
SIE
BIT CLOCK
RECOVERY
PLL
6 MHz
SUPPLY
REGULATOR
VCC
3.3 V
5 V
Vreg(3.3)
SDA
INDV
OPTION
SCL
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 3 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
5. Pinning information
5.1 ISP1122AD (SO32) and ISP1122ANB (SDIP32)
5.1.1 Pinning
5.1.2 Pin description
Fig 2. Pin configuration SO32. Fig 3. Pin configuration SDIP32.
handbook, halfpage
ISP1122AD
MBL163
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
Vreg(3.3)
GND
DM3
DP3
VCC
DM4
DP4
DP2
DM2
DP0
DP1
DM1
DM0
DP5
DM5
INDV/SDA
OPTION/SCL
XTAL2
XTAL1
PSW1/GL1
RESET
PSW5/GL5/GPSW
PSW4/GL4PSW3/GL3
HUBGL
SP/BP
OC5/GOC
PSW2/GL2
OC1
OC2
OC3
OC4
handbook, halfpage
ISP1122ANB
MBL164
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
Vreg(3.3)
GND
DM3
DP3
VCC
DM4
DP4
DP2
DM2
DP0
DP1
DM1
DM0
DP5
DM5
INDV/SDA
OPTION/SCL
XTAL2
XTAL1
PSW1/GL1
RESET
PSW5/GL5/GPSW
PSW4/GL4PSW3/GL3
HUBGL
SP/BP
OC5/GOC
PSW2/GL2
OC1
OC2
OC3
OC4
Table 2: Pin description for SO32 and SDIP32
Symbol[1] Pin Type Description
Vreg(3.3)[2] 1 - regulated supply voltage (3.3 V ±10%) from internal
regulator; used to connect pull-up resistor on DP0 line
PSW2/GL2[3] 2Omodes 4 to 6: power switch control output for downstream
port 2 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 2 (open-drain, 6 mA); to connect an LED
use a 330 series resistor
GND 3 - ground supply
DM3 4 AI/O downstream port 3 D connection (analog)[4]
DP3 5 AI/O downstream port 3 D+ connection (analog)[4]
VCC 6 - supply voltage; connect to USB supply VBUS (bus-powered or
hybrid-powered) or to local supply VDD (self-powered)
OC1 7 AI/I overcurrent sense input for downstream port 1 (analog[5])
OC2 8 AI/I overcurrent sense input for downstream port 2 (analog[5])
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 4 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
OC3 9 AI/I overcurrent sense input for downstream port 3 (analog[5])
OC4 10 AI/I overcurrent sense input for downstream port 4 (analog[5])
OC5/GOC[3] 11 AI/I modes 5, 7: overcurrent sense input for downstream port 5
(analog[5])
modes 0, 1, 3: global overcurrent sense input (analog[5])
DM4 12 AI/O downstream port 4 D connection (analog)[4]
DP4 13 AI/O downstream port 4 D+ connection (analog)[4]
SP/BP 14 I selects power mode:
self-powered: connect to VDD (local power supply); also use
this mode for hybrid-powered operation
bus-powered: connect to GND; disable downstream port 5 to
meet supply current requirements[4]
HUBGL 15 O hub GoodLink LED indicator output (open-drain, 6 mA);
to connect an LED use a 330 series resistor; if unused
connect to VCC via a 10 k resistor
PSW3/GL3[3] 16 O modes 4 to 6: power switch control output for downstream
port 3 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 3 (open-drain, 6 mA); to connect an LED
use a 330 series resistor
PSW4/GL4[3] 17 O modes 4 to 6: power switch control output for downstream
port 4 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 4 (open-drain, 6 mA); to connect an LED
use a 330 series resistor
PSW5/GL5/
GPSW[3] 18 O mode 5: power switch control output for downstream port 5
(open-drain, 6 mA)
modes 3, 7: GoodLink LED indicator output for downstream
port 5 (open-drain, 6 mA); to connect an LED use a 330
series resistor
modes 0 to 2: gang mode power switch control output
(open-drain, 6 mA)
XTAL1 19 I crystal oscillator input (6 MHz)
XTAL2 20 O crystal oscillator output (6 MHz)
RESET[2] 21 I reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to VCC for power-on reset
(internal POR circuit)
OPTION/SCL 22 I/O mode selection input; also functions as I2C-bus clock output
(open-drain, 6 mA)
INDV/SDA 23 I/O selects individual (HIGH) or global (LOW) power switching
and overcurrent detection; also functions as bidirectional
I2C-bus data line (open-drain, 6 mA)
DM5 24 AI/O downstream port 5 D connection (analog)[4]
DP5 25 AI/O downstream port 5 D+ connection (analog)[4]
DM1 26 AI/O downstream port 1 D connection (analog)[6]
DP1 27 AI/O downstream port 1 D+ connection (analog)[6]
Table 2: Pin description for SO32 and SDIP32
…continued
Symbol[1] Pin Type Description
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 5 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.
[2] The voltage at pin Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by
connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.
[3] See Table 4 “Mode selection”.
[4] To disable a downstream port connect both D+and Dto VCC via a 1 Mresistor; unused ports must
be disabled in reverse order starting from port 5.
[5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case,
the pin functions as a logic input (TTL level).
[6] Downstream ports 1 and 2 cannot be disabled.
DM0 28 AI/O upstream port D connection (analog)
DP0 29 AI/O upstream port D+ connection (analog)
DM2 30 AI/O downstream port 2 D connection (analog)[6]
DP2 31 AI/O downstream port 2 D+ connection (analog)[6]
PSW1/GL1[3] 32 O modes 4 to 6: power switch control output for downstream
port 1 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 1 (open-drain, 6 mA); to connect an LED
use a 330 series resistor
Table 2: Pin description for SO32 and SDIP32
…continued
Symbol[1] Pin Type Description
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 6 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
5.2 ISP1122ABD (LQFP32)
5.2.1 Pinning
5.2.2 Pin description
Fig 4. Pin configuration LQFP32.
i
dth
ISP1122ABD
MBL165
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
DM3
GND
PSW2/GL2
Vreg(3.3)
PSW1/GL1
DP2
DM2
DP0
DP4
SP/BP
HUBGL
PSW3/GL3
PSW4/GL4
PSW5/GL5/GPSW
XTAL1
XTAL2
DP3
VCC
OC1
DM4
DM0
DP1
DM1
DP5
DM5
INDV/SDA
OPTION/SCL
RESET
OC2
OC3
OC4
OC5/GOC
Table 3: Pin description for LQFP32
Symbol[1] Pin Type Description
Vreg(3.3)[2] 29 - regulated supply voltage (3.3 V ±10%) from internal
regulator; used to connect pull-up resistor on DP0 line
PSW2/GL2[3] 30 O modes 4 to 6: power switch control output for downstream
port 2 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 2 (open-drain, 6 mA); to connect an LED
use a 330 series resistor
GND 31 - ground supply
DM3 32 AI/O downstream port 3 D connection (analog)[4]
DP3 1 AI/O downstream port 3 D+ connection (analog)[4]
VCC 2 - supply voltage; connect to USB supply VBUS (bus-powered or
hybrid-powered) or to local supply VDD (self-powered)
OC1 3 AI/I overcurrent sense input for downstream port 1 (analog[5])
OC2 4 AI/I overcurrent sense input for downstream port 2 (analog[5])
OC3 5 AI/I overcurrent sense input for downstream port 3 (analog[5])
OC4 6 AI/I overcurrent sense input for downstream port 4 (analog[5])
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 7 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
OC5/GOC[3] 7 AI/I modes 5, 7: overcurrent sense input for downstream port 5
(analog[5])
modes 0, 1, 3: global overcurrent sense input (analog[5])
DM4 8 AI/O downstream port 4 D connection (analog)[4]
DP4 9 AI/O downstream port 4 D+ connection (analog)[4]
SP/BP 10 I selects power mode:
self-powered: connect to VDD (local power supply); also use
this mode for hybrid-powered operation
bus-powered: connect to GND; disable downstream port 5 to
meet supply current requirements[4]
HUBGL 11 O hub GoodLink LED indicator output (open-drain, 6 mA);
to connect an LED use a 330 series resistor; if unused
connect to VCC via a 10 k resistor
PSW3/GL3[3] 12 O modes 4 to 6: power switch control output for downstream
port 3 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 3 (open-drain, 6 mA); to connect an LED
use a 330 series resistor
PSW4/GL4[3] 13 O modes 4 to 6: power switch control output for downstream
port 4 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 4 (open-drain, 6 mA); to connect an LED
use a 330 series resistor
PSW5/GL5/
GPSW[3] 14 O mode 5: power switch control output for downstream port 5
(open-drain, 6 mA)
modes 3, 7: GoodLink LED indicator output for downstream
port 5 (open-drain, 6 mA); to connect an LED use a 330
series resistor
modes 0 to 2: gang mode power switch control output
(open-drain, 6 mA)
XTAL1 15 I crystal oscillator input (6 MHz)
XTAL2 16 O crystal oscillator output (6 MHz)
RESET[2] 17 I reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to VCC for power-on reset
(internal POR circuit)
OPTION/SCL 18 I/O mode selection input; also functions as I2C-bus clock output
(open-drain, 6 mA)
INDV/SDA 19 I/O selects individual (HIGH) or global (LOW) power switching
and overcurrent detection; also functions as bidirectional
I2C-bus data line (open-drain, 6 mA)
DM5 20 AI/O downstream port 5 D connection (analog)[4]
DP5 21 AI/O downstream port 5 D+ connection (analog)[4]
DM1 22 AI/O downstream port 1 D connection (analog)[6]
DP1 23 AI/O downstream port 1 D+ connection (analog)[6]
DM0 24 AI/O upstream port D connection (analog)
DP0 25 AI/O upstream port D+ connection (analog)
Table 3: Pin description for LQFP32
…continued
Symbol[1] Pin Type Description
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 8 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.
[2] The voltage at pin Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by
connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.
[3] See Table 4 “Mode selection”.
[4] To disable a downstream port connect both D+and Dto VCC via a 1 Mresistor; unused ports must
be disabled in reverse order starting from port 5.
[5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case,
the pin functions as a logic input (TTL level).
[6] Downstream ports 1 and 2 cannot be disabled.
6. Functional description
The ISP1122A is a stand-alone USB hub with up to 5 downstream ports. The number
of ports can be configured between 2 and 5. The downstream ports can be used to
connect low-speed or full-speed USB peripherals. All standard USB requests from
the host are handled by the hardware without the need for firmware intervention. The
block diagram is shown in Figure 1.
The ISP1122A requires only a single supply voltage. An internal 3.3 V regulator
provides the supply voltage for the analog USB data transceivers.
The ISP1122A supports both bus-powered and self-powered hub operation. When
using bus-powered operation a downstream port cannot supply more than 100 mA to
a peripheral. In case of self-powered operation an external supply is used to power
the downstream ports, allowing a current consumption of max. 500 mA per port.
A basic I2C-bus interface is provided for reading vendor ID, product ID and
configuration bits from an external EEPROM upon a reset.
6.1 Analog transceivers
The integrated transceiver interfaces directly to the USB cables through external
termination resistors. They are capable of transmitting and receiving serial data at
both ‘full-speed’ (12 Mbit/s) and ‘low-speed’ (1.5 Mbit/s) data rates. The slew rates
are adjusted according to the speed of the device connected and lie within the range
mentioned in the
USB Specification Rev. 1.1
.
DM2 26 AI/O downstream port 2 D connection (analog)[6]
DP2 27 AI/O downstream port 2 D+ connection (analog)[6]
PSW1/GL1[3] 28 O modes 4 to 6: power switch control output for downstream
port 1 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 1 (open-drain, 6 mA); to connect an LED
use a 330 series resistor
Table 3: Pin description for LQFP32
…continued
Symbol[1] Pin Type Description
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 9 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
6.2 Philips Serial Interface Engine (SIE)
The Philips SIE implements the full USB protocol layer. It is completely hardwired for
speed and needs no firmware intervention. The functions of this block include:
synchronization pattern recognition, parallel/serial conversion, bit (de-)stuffing, CRC
checking/generation, Packet IDentifier (PID) verification/generation, address
recognition, handshake evaluation/generation.
6.3 Hub repeater
The hub repeater is responsible for managing connectivity on a ‘per packet’ basis. It
implements ‘packet signalling’ and ‘resume’ connectivity. Low-speed devices can be
connected to downstream ports. If a low-speed device is detected the repeater will
not propagate upstream packets to the corresponding port, unless they are preceded
by a PREAMBLE PID.
6.4 End-of-frame timers
This block contains the specified EOF1 and EOF2 timers which are used to detect
‘loss-of-activity’ and ‘babble’ error conditions in the hub repeater. The timers also
maintain the low-speed keep-alive strobe which is sent at the beginning of a frame.
6.5 General and individual port controller
The general and individual port controllers together provide status and control of
individual downstream ports. Any port status change will be reported to the host via
the hub status change (interrupt) endpoint.
6.6 GoodLink
Indication of a good USB connection is provided through GoodLink technology. An
LED can be directly connected via an external 330 resistor.
During enumeration the LED blinks on momentarily. After successful configuration of
the ISP1122A, the LED is permanently on. The LED blinks off for 100 ms upon each
successful packet transfer (with ACK). The hub GoodLink indicator blinks when the
hub receives a packet addressed to it. Downstream GoodLink indicators blink upon
an acknowledgment from the associated port. In ‘suspend’ mode the LED is off.
This feature provides a user-friendly indication of the status of the hub, the connected
downstream devices and the USB traffic. It is a useful diagnostics tool to isolate faulty
USB equipment and helps to reduce field support and hotline costs.
6.7 Bit clock recovery
The bit clock recovery circuit recovers the clock from the incoming USB data stream
using a 4×oversampling principle. It is able to track jitter and frequency drift as
specified by the
USB Specification Rev. 1.1
.
6.8 Voltage regulator
A 5 to 3.3 V DC-DC regulator is integrated on-chip to supply the analog transceiver
and internal logic. This can also be used to supply the terminal 1.5 kpull-up resistor
on the D+ line of the upstream connection.
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 10 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
6.9 PLL clock multiplier
A 6 to 48 MHz clock multiplier Phase-Locked Loop (PLL) is integrated on-chip. This
allows for the use of low-cost 6 MHz crystals. The low crystal frequency also
minimizes Electro-Magnetic Interference (EMI). The PLL requires no external
components.
6.10 Overcurrent detection
An overcurrent detection circuit for downstream ports has been integrated on-chip. It
is self-reporting, resets automatically, has a low trip time and requires no external
components. Both individual and global overcurrent detection are supported.
6.11 I2C-bus interface
A basic serial I2C-bus interface (single master, 100 kHz) is provided to read VID, PID
and configuration bits from an external I2C-bus EEPROM (e.g. Philips PCF8582 or
equivalent). At reset the ISP1122A reads 6 bytes of data from the external memory.
The I2C-bus interface timing complies with the standard mode of operation as
described in
The I
2
C-bus and how to use it
, order number 9398 393 40011.
7. Modes of operation
The ISP1122A has several modes of operation, each corresponding with a different
pin configuration. Modes are selected by means of pins INDV, OPTION and SP/BP,
as shown in Table 4.
[1] Port power switching: logic 0 = ganged, logic 1 = individual.
[2] Power mode: logic0=bus-powered, logic 1 = self-powered (or hybrid-powered).
[3] No overcurrent detection.
[4] No power switching.
Table 4: Mode selection
Mode INDV
[1] OPTION SP/BP
[2] PSWn/GLn
(n = 1 to 4) PSW5/GL5/GPSW OCn
(n = 1 to 4) OC5/GOC
0000GoodLink ganged power inactive global overcurrent
1001GoodLink ganged power inactive global overcurrent
2010GoodLink ganged power inactive[3] inactive[3]
3011GoodLink[4] GoodLink[4] inactive global overcurrent
4100individual power inactive individual
overcurrent inactive
5101individual power individual power individual
overcurrent individual
overcurrent
6110individual power inactive inactive[3] inactive[3]
7111GoodLink[4] GoodLink[4] individual
overcurrent individual
overcurrent
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 11 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
8. Endpoint descriptions
Each USB device is logically composed of several independent endpoints. An
endpoint acts as a terminus of a communication flow between the host and the
device. At design time each endpoint is assigned a unique number (endpoint
identifier, see Table 5). The combination of the device address (given by the host
during enumeration), the endpoint number and the transfer direction allows each
endpoint to be uniquely referenced.
The ISP1122A has two endpoints, endpoint 0 (control) and endpoint 1 (interrupt).
[1] IN: input for the USB host; OUT: output from the USB host.
8.1 Hub endpoint 0 (control)
All USB devices and functions must implement a default control endpoint (ID = 0).
This endpoint is used by the host to configure the device and to perform generic USB
status and control access.
The ISP1122A hub supports the following USB descriptor information through its
control endpoint 0, which can handle transfers of 64 bytes maximum:
Device descriptor
Configuration descriptor
Interface descriptor
Endpoint descriptor
Hub descriptor
String descriptor.
8.2 Hub endpoint 1 (interrupt)
Endpoint 1 is used by the ISP1122A hub to provide status change information to the
host. This endpoint can be accessed only after the hub has been configured by the
host (by sending the Set Configuration command).
Endpoint 1 is an interrupt endpoint: the host polls it once every 255 ms by sending an
IN token. If the hub has detected no change in the port status it returns a NAK (Not
AcKnowledge) response to this request, otherwise it sends the Status Change byte
(see Table 6).
Table 5: Hub endpoints
Function Ports Endpoint
identifier Transfer
type Direction[1] Max. packet
size (bytes)
Hub 0: upstream
1 to 5: downstream 0 control OUT 64
IN 64
1 interrupt IN 1
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 12 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
9. Host requests
The ISP1122A handles all standard USB requests from the host via control
endpoint 0. The control endpoint can handle a maximum of 64 bytes per transfer.
Remark: Please note that the USB data transmission order is Least Significant Bit
(LSB) first. In the following tables multi-byte variables are displayed least significant
byte first.
9.1 Standard requests
Table 7 shows the supported standard USB requests. Some requests are explicitly
unsupported. All other requests will be responded with a STALL packet.
Table 6: Status Change byte: bit allocation
Bit Symbol Description
0 Hub SC a logic 1 indicates a status change on the hub’s upstream port
1 Port 1 SC a logic 1 indicates a status change on downstream port 1
2 Port 2 SC a logic 1 indicates a status change on downstream port 2
3 Port 3 SC a logic 1 indicates a status change on downstream port 3
4 Port 4 SC a logic 1 indicates a status change on downstream port 4
5 Port 5 SC a logic 1 indicates a status change on downstream port 5
6 reserved not used
7 reserved not used
Table 7: Standard USB requests
Request name bmRequestType
byte 0 [7:0]
(Bin)
bRequest
byte 1
(Hex)
wValue
byte 2, 3
(Hex)
wIndex
byte 4, 5
(Hex)
wLength
byte 6, 7
(Hex)
Data
Address
Set Address X000 0000 05 address[1] 00, 00 00, 00 none
Configuration
Get Configuration 1000 0000 08 00, 00 00, 00 01, 00 configuration
value = 01H
Set Configuration (0) X000 0000 09 00, 00 00, 00 00, 00 none
Set Configuration (1) X000 0000 09 01, 00 00, 00 00, 00 none
Descriptor
Get Configuration
Descriptor 1000 0000 06 00, 02 00, 00 length[2] configuration,
interface and
endpoint
descriptors
Get Device Descriptor 1000 0000 06 00, 01 00, 00 length[2] device
descriptor
Get String Descriptor (0) 1000 0000 06 03, 00 00, 00 length[2] language ID
string
Get String Descriptor (1) 1000 0000 06 03, 01 00, 00 length[2] manufacturer
string
Get String Descriptor (2) 1000 0000 06 03, 02 00, 00 length[2] product string
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 13 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] Device address: 0 to 127.
[2] Returned value in bytes.
[3] MSB specifies endpoint direction: 0 = OUT, 1 = IN. The ISP1122A accepts either value.
9.2 Hub specific requests
In Table 8 the supported hub specific requests are listed, as well as some
unsupported requests. Table 9 provides the feature selectors for setting or clearing
port features.
Feature
Clear Device Feature
(REMOTE_WAKEUP) X000 0000 01 01, 00 00, 00 00, 00 none
Clear Endpoint (1)
Feature (HALT/STALL) X000 0010 01 00, 00 81, 00 00, 00 none
Set Device Feature
(REMOTE_WAKEUP) X000 0000 03 01, 00 00, 00 00, 00 none
Set Endpoint (1)
Feature (HALT/STALL) X000 0010 03 00, 00 81, 00 00, 00 none
Status
Get Device Status 1000 0000 00 00, 00 00, 00 02, 00 device status
Get Interface Status 1000 0001 00 00, 00 00, 00 02, 00 zero
Get Endpoint (0) Status 1000 0010 00 00, 00 00/80[3], 00 02, 00 endpoint 0
status
Get Endpoint (1) Status 1000 0010 00 00, 00 81, 00 02, 00 endpoint 1
status
Unsupported
Set Descriptor 0000 0000 07 XX, XX XX, XX XX, XX descriptor;
STALL
Get Interface 1000 0001 0A 00, 00 XX, XX 01, 00 STALL
Set Interface X000 0001 0B XX, XX XX, XX 00, 00 STALL
Synch Frame 1000 0010 0C 00, 00 XX, XX 02, 00 STALL
Table 7: Standard USB requests
…continued
Request name bmRequestType
byte 0 [7:0]
(Bin)
bRequest
byte 1
(Hex)
wValue
byte 2, 3
(Hex)
wIndex
byte 4, 5
(Hex)
wLength
byte 6, 7
(Hex)
Data
Table 8: Hub specific requests
Request name bmRequestType
byte 0 [7:0]
(Bin)
bRequest
byte 1
(Hex)
wValue
byte 2, 3
(Hex)
wIndex
byte 4, 5
(Hex)
wLength
byte 6, 7
(Hex)
Data
Descriptor
Get Hub Descriptor 1010 0000 06 00, 00/29[1] 00, 00 length[2], 00 hub descriptor
Feature
Clear Hub Feature
(C_LOCAL_POWER) X010 0000 01 00, 00 00, 00 00, 00 none
Clear Port Feature
(feature selectors) X010 0011 01 feature[3], 00 port[4], 00 00, 00 none
Set Port Feature
(feature selectors) X010 0011 03 feature[3], 00 port[4], 00 00, 00 none
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 14 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1]
USB Specification Rev. 1.0
uses 00H,
USB Specification Rev. 1.1
specifies 29H.
[2] Returned value in bytes.
[3] Feature selector value, see Table 9.
[4] Downstream port identifier: 1 to N with N = number of enabled ports (2 to 5).
Status
Get Hub Status 1010 0000 00 00, 00 00, 00 04, 00 hubstatusand
status change
field
Get Port Status 1010 0011 00 00, 00 port[4], 00 04, 00 port status
Unsupported
Get Bus Status 1010 0011 02 00, 00 port[4], 00 01, 00 STALL
Clear Hub Feature
(C_OVER_CURRENT) X010 0000 01 01, 00 00, 00 00, 00 STALL
Set Hub Descriptor 0010 0000 07 XX, XX 00, 00 3E, 00 STALL
Set Hub Feature
(C_LOCAL_POWER) X010 0000 03 00, 00 00, 00 00, 00 STALL
Set Hub Feature
(C_OVER_CURRENT) X010 0000 03 01, 00 00, 00 00, 00 STALL
Table 8: Hub specific requests
…continued
Request name bmRequestType
byte 0 [7:0]
(Bin)
bRequest
byte 1
(Hex)
wValue
byte 2, 3
(Hex)
wIndex
byte 4, 5
(Hex)
wLength
byte 6, 7
(Hex)
Data
Table 9: Port feature selectors
Feature selector name Value (Hex) Set feature Clear feature
PORT_CONNECTION 00 not used not used
PORT_ENABLE 01 not used disables a port
PORT_SUSPEND 02 suspends a port resumes a port
PORT_OVERCURRENT 03 not used not used
PORT_RESET 04 resets and enables a
port not used
PORT_POWER 08 powers on a port powers off a port
PORT_LOW_SPEED 09 not used not used
C_PORT_CONNECTION 10 not used clears port connection
change bit
C_PORT_ENABLE 11 not used clears port enable
change bit
C_PORT_SUSPEND 12 not used clears port suspend
change bit
C_PORT_OVERCURRENT 13 not used clears port overcurrent
change bit
C_PORT_RESET 14 not used clears port reset
change bit
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 15 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
9.3 Descriptors
The ISP1122A hub controller supports the following standard USB descriptors:
Device
Configuration
Interface
Endpoint
Hub
String.
Table 10: Device descriptor
Values in square brackets are optional.
Offset
(bytes) Field name Size
(bytes) Value
(Hex) Comments
0 bLength 1 12 descriptor length = 18 bytes
1 bDescriptorType 1 01 type = DEVICE
2 bcdUSB 2 10, 01
USB Specification Rev. 1.1
4 bDeviceClass 1 09 HUB_CLASSCODE
5 bDeviceSubClass 1 00 -
6 bDeviceProtocol 1 00 -
7 bMaxPacketSize0 1 40 packet size = 64 bytes
8 idVendor 2 CC, 04 Philips Semiconductors vendor ID
(04CC); can be customized using an
external EEPROM (see Table 23)
10 idProduct 2 22, 11 ISP1122A product ID; can be
customized using an external
EEPROM (see Table 23)
12 bcdDevice 2 01, 01 device release 1.1; silicon revision
increments this value
14 iManufacturer 1 00 no manufacturer string (default)
[01] manufacturer string enabled
(using an external EEPROM)
15 iProduct 1 00 no product string (default)
[02] product string enabled
(using an external EEPROM)
16 iSerialNumber 1 00 no serial number string
17 bNumConfigurations 1 01 one configuration
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 16 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] Selected by input SP/BP.
[2] Value in units of 2 mA.
Table 11: Configuration descriptor
Values in square brackets are optional.
Offset
(bytes) Field name Size
(bytes) Value
(Hex) Comments
0 bLength 1 09 descriptor length=9bytes
1 bDescriptorType 1 02 type = CONFIGURATION
2 wTotalLength 2 19, 00 total length of configuration, interface
and endpoint descriptors (25 bytes)
4 bNumInterfaces 1 01 one interface
5 bConfigurationValue 1 01 configuration value = 1
6 iConfiguration 1 00 no configuration string
7 bmAttributes 1 E0 self-powered with remote wake-up[1]
A0 bus-powered with remote wake-up[1]
8 MaxPower[2] 1 32 100 mA (default)
[00] 0 mA (using an external EEPROM)
[FA] 500 mA (using an external EEPROM)
Table 12: Interface descriptor
Offset
(bytes) Field name Size
(bytes) Value
(Hex) Comments
0 bLength 1 09 descriptor length=9bytes
1 bDescriptorType 1 04 type = INTERFACE
2 bInterfaceNumber 1 00 -
3 bAlternateSetting 1 01 no alternate setting
4 bNumEndpoints 1 01 status change (interrupt) endpoint
5 bInterfaceClass 1 09 HUB_CLASSCODE
6 bInterfaceSubClass 1 00 -
7 bInterfaceProtocol 1 00 no class-specific protocol
8 bInterface 1 00 no interface string
Table 13: Endpoint descriptor
Offset
(bytes) Field name Size
(bytes) Value
(Hex) Comments
0 bLength 1 07 descriptor length=7bytes
1 bDescriptorType 1 05 type = ENDPOINT
2 bEndpointAddress 1 81 endpoint 1, direction: IN
3 bmAttributes 1 03 interrupt endpoint
4 wMaxPacketSize 2 01, 00 packet size = 1 byte
6 bInterval 1 FF polling interval (255 ms)
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 17 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] ISP1122A always reports power management status on an individual basis, even for ganged/global
modes. This is compliant with
USB Specification Rev. 1.1
.
[2] Condition with no overcurrent detection is reported to the host.
[3] Value in units of 2 ms.
[1] Unicode encoded string.
Table 14: Hub descriptor
Values in square brackets are optional.
Offset
(bytes) Field name Size
(bytes) Value
(Hex) Comments
0 bDescLength 1 09 descriptor length=9bytes
1 bDescriptorType 1 29 type = HUB
2 bNbrPorts 1 05 to 02 number of enabled downstream ports;
selectable by DP/DM strapping
3 wHubCharacteristics 2 09, 00 individual power switching[1],
overcurrent protection active
(modes 0, 1, 3, 4, 5, 7)
11, 00 individual power switching[1], no
overcurrent protection (modes 2, 6)[2]
5 bPwrOn2PwrGood[3] 1 32 100 ms (default; modes 0, 1, 2, 4, 5, 6)
00 0 ms (default; modes 3, 7)
[FA] 500 ms (using an external EEPROM;
modes 0, 1, 2, 4, 5, 6); see Table 23
6 bHubContrCurrent 1 64 maximum hub controller current
(100 mA)
7 DeviceRemovable 1 00 all devices removable
8 PortPwrCtrlMask 1 FF must be all ones for compatibility with
USB Specification Rev. 1.0
Table 15: String descriptors
String descriptors are optional and therefore disabled by default; they can be enabled through
an external EEPROM.
Offset
(bytes) Field name Size
(bytes) Value
(Hex) Comments
String descriptor (0): language ID string
0 bLength 1 04 descriptor length=4bytes
1 bDescriptorType 1 03 type = STRING
2 bString 2 09, 04 LANGID code zero
String descriptor (1): manufacturer string
0 bLength 1 2E descriptor length = 46 bytes
1 bDescriptorType 1 03 type = STRING
2 bString 44 UC[1] “Philips Semiconductors”
String descriptor (2): product string
0 bLength 1 10 descriptor length = 16 bytes
1 bDescriptorType 1 03 type = STRING
2 bString 14 UC[1] “ISP1122”
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 18 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
9.4 Hub responses
This section describes the hub responses to requests from the USB host.
9.4.1 Get device status
The hub returns 2 bytes, see Table 16.
9.4.2 Get configuration
The hub returns 1 byte, see Table 17.
9.4.3 Get interface status
The hub returns 2 bytes, see Table 18.
9.4.4 Get hub status
The hub returns 4 bytes, see Table 19.
Table 16: Get device status response
Bit # Function Value Description
0 self-powered 0 bus-powered
1 self-powered
1 remote wake-up 0 no remote wake-up
1 remote wake-up enabled
2 to 15 reserved 0 -
Table 17: Get configuration response
Bit # Function Value Description
0 configuration value 0 device not configured
1 device configured
1 to 7 reserved 0 -
Table 18: Get interface status response
Bit # Function Value Description
0 to 15 reserved 0 -
Table 19: Get hub status response
Bit # Function Value Description
0 local power source 0 local power supply good
1 local power supply lost
1 overcurrent indicator 0 no overcurrent condition
1 hub overcurrent condition detected
2 to 15 reserved 0 -
16 local power status change 0 no change in local power status
1 local power status changed
17 overcurrent indicator change 0 no change in overcurrent condition
1 overcurrent condition changed
18 to 31 reserved 0 -
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 19 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
9.4.5 Get port status
The hub returns 4 bytes. The first 2 bytes contain the port status bits (wPortStatus,
see Table 20). The last 2 bytes hold the port status change bits (wPortChange, see
Table 21).
Table 20: Get port status response (wPortStatus)
Bit # Function Value Description
0 current connect status 0 no device present
1 device present on this port
1 port enabled/disabled 0 port disabled
1 port enabled
2 suspend 0 port not suspended
1 port suspended
3 overcurrent indicator 0 no overcurrent condition
1 overcurrent condition detected
4 reset 0 reset not asserted
1 reset asserted
5 to 7 reserved 0 -
8 port power 0 port powered off
1 port power on
9 low-speed device attached 0 full-speed device attached
1 low-speed device attached
10 to 15 reserved 0 -
Table 21: Get port status response (wPortChange)
Bit # Function Value Description
0 connect status change 0 no change in current connect status
1 current connect status changed
1 port enabled/disabled
change 0 no port error
1 port disabled by a port error
2 suspend change 0 no change in suspend status
1 resume complete
3 overcurrent indicator change 0 no change in overcurrent status
1 overcurrent indicator changed
4 reset change 0 no change in reset status
1 reset complete
5 to 15 reserved 0 -
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 20 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
9.4.6 Get configuration descriptor
The hub returns 25 bytes containing the configuration descriptor (9 bytes, see
Table 11), the interface descriptor (9 bytes, see Table 12) and the endpoint descriptor
(7 bytes, see Table 13).
9.4.7 Get device descriptor
The hub returns 18 bytes containing the device descriptor, see Table 10.
9.4.8 Get hub descriptor
The hub returns 9 bytes containing the hub descriptor, see Table 14.
9.4.9 Get string descriptor (0)
The hub returns 4 bytes containing the language ID, see Table 15.
9.4.10 Get string descriptor (1)
The hub returns 46 bytes containing the manufacturer name, see Table 15.
9.4.11 Get string descriptor (2)
The hub returns 16 bytes containing the product name, see Table 15.
10. I2C-bus interface
A simple I2C-bus interface is provided in the ISP1122A to read customized vendor ID,
product ID and some other configuration bits from an external EEPROM. The
interface supports single master operation at a nominal bus speed of 93.75 kHz.
The I2C-bus interface is intended for bidirectional communication between ICs via two
serial bus wires, SDA (data) and SCL (clock). Both lines are driven by open-drain
circuits and must be connected to the positive supply voltage via pull-up resistors.
10.1 Protocol
The I2C-bus protocol defines the following conditions:
Bus free: both SDA and SCL are HIGH
START: a HIGH-to-LOW transition on SDA, while SCL is HIGH
STOP: a LOW-to-HIGH transition on SDA, while SCL is HIGH
Data valid: after a START condition, data on SDA are stable during the HIGH
period of SCL; data on SDA may only change while SCL is LOW.
Each device on the I2C-bus has a unique slave address, which the master uses to
select a device for access.
The master starts a data transfer using a START condition and ends it by generating
a STOP condition. Transfers can only be initiated when the bus is free. The receiver
must acknowledge each byte by means of a LOW level on SDA during the ninth clock
pulse on SCL.
For detailed information please consult
The I
2
C-bus and how to use it
., order number
9398 393 40011.
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 21 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
10.2 Hardware connections
Via the I2C-bus interface the ISP1122A can be connected to an external EEPROM
(PCF8582 or equivalent). The hardware connections are shown in Figure 5.
The SCL and SDA pins are multiplexed with pins OPTION and INDV respectively.
The slave address which ISP1122A uses to access the EEPROM is 1010000B. Page
mode addressing is not supported, so pins A0, A1 and A2 of the EEPROM must be
connected to GND (logic 0).
10.3 Data transfer
When the ISP1122A is reset, the I2C-bus interface tries to read 6 bytes of
configuration data from an external EEPROM. If no response is detected, the levels
on inputs SDA and SCL are interpreted as INDV and OPTION to select the operating
mode (see Table 4).
The data in the EEPROM memory are organized as shown in Table 22.
[1] Vendor ID code in the Device descriptor, see Table 10.
[2] Product ID code in the Device descriptor, see Table 10.
Fig 5. EEPROM connection diagram.
i
dth
MBL166
INDV/SDA
OPTION/SCL
A1
A2
A0
SDA
SCL
VDD
RP
RP
VDD
ISP1122A
USB HUB
PCF8582
EEPROM
or
equivalent
I2C-bus
Table 22: EEPROM organization
Address
(Hex) Default value
(Hex) Contents
00 CC idVendor[1] (lower byte)
01 04 idVendor[1] (upper byte)
02 22 idProduct[2] (lower byte)
03 11 idProduct[2] (upper byte)
04 - configuration bits C7 to C0; see Table 23
05 AA signature
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 22 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] Default value at reset if no external EEPROM is present.
[2] Modifies the Hub Descriptor field ‘bPwrOn2PwrGood’, see Table 14.
[3] Modifies the Hub Descriptor field ‘MaxPower’, see Table 14.
11. Hub power modes
USB hubs can either be self-powered or bus-powered.
Self-powered — Self-powered hubs have a 5 V local power supply on board which
provide power to the hub and the downstream ports. The
USB Specification Rev. 1.1
requires that these hubs limit the current to 500 mA per downstream port and report
overcurrent conditions to the host. The hub may optionally draw 100 mA from the
USB supply (VBUS) to power the interface functions (hybrid-powered).
Bus-powered — Bus-powered hubs obtain all power from the host or an upstream
self-powered hub. The maximum current is 100 mA per downstream port. Current
limiting and reporting of overcurrent conditions are both optional.
Power switching of downstream ports can be done individually or ganged, where all
ports are switched simultaneously with one power switch. The ISP1122A supports
both modes, which can be selected using input INDV (see Table 4).
11.1 Voltage drop requirements
11.1.1 Self-powered hubs
Self-powered hubs are required to provide a minimum of 4.75 V to its output port
connectors at all legal load conditions. To comply with Underwriters Laboratory Inc.
(UL) safety requirements, the power from any port must be limited to 25 W (5 A at
5 V). Overcurrent protection may be implemented on a global or individual basis.
Table 23: Configuration bits
Bit Function Value
(Bin) Description
C0 OPTION see Table 4 “Mode selection”
C1 INDV see Table 4 “Mode selection”
C2 reserved 0[1] must always be programmed to logic 0
C3 PwrOn2PwrGood[2] 0[1] 100 ms (bPwrOn2PwrGood = 32H)
1 500 ms (bPwrOn2PwrGood = FAH)
C4 string descriptor enable 0[1] string descriptors disabled
1 string descriptors enabled (strings:
“Philips Semiconductors”, “ISP1122”)
C5 internal analog overcurrent
detection enable 0 internal analog overcurrent detection
circuit disabled; overcurrent pins OCn
function as digital inputs (TTL level)
1[1] internal analog overcurrent detection
circuit enabled
C7, C6 MaxPower[3] 00[1] 100 mA (MaxPower = 32H)
1X 500 mA (MaxPower = FAH)
01 0 mA (MaxPower = 00H)
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 23 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Assuming a 5 V ±3% power supply the worst case supply voltage is 4.85 V. This only
allows a voltage drop of 100 mV across the hub printed-circuit board (PCB) to each
downstream connector. This includes a voltage drop across:
Power supply connector
Hub PCB (power and ground traces, ferrite beads)
Power switch (FET on-resistance)
Overcurrent sense device.
PCB resistance and power supply connector resistance may cause a drop of 25 mV,
leaving only 75 mV as the voltage drop allowed across the power switch and
overcurrent sense device. The individual voltage drop components are shown in
Figure 6.
In case of global overcurrent detection an increased voltage drop is needed for the
overcurrent sense device (in this case a low-ohmic resistor). This can be realized by
using a special power supply of 5.1 V ±3%, as shown in Figure 7.
11.1.2 Bus-powered hubs
Bus-powered hubs are guaranteed to receive a supply voltage of 4.5 V at the
upstream port connector and must provide a minimum of 4.4 V to the downstream
port connectors. The voltage drop of 100 mV across bus-powered hubs includes:
Hub PCB (power and ground traces, ferrite beads)
Power switch (FET on-resistance)
Overcurrent sense device.
(1) Includes PCB traces, ferrite beads, etc.
Fig 6. Typical voltage drop components in self-powered mode using individual overcurrent detection.
5 V
POWER SUPPLY
± 3% regulated
+4.85 V(min)
04aa03
low-ohmic
PMOS switch
ISP1122A
power
switch
VBUS
D+
D
GND
SHIELD
4.75 V(min)
downstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
(1)
(1) Includes PCB traces, ferrite beads, etc.
Fig 7. Typical voltage drop components in self-powered mode using global overcurrent detection.
5.1 V KICK-UP
POWER SUPPLY
± 3% regulated
+4.95 V(min)
04aa05
low-ohmic
PMOS switch
ISP1122A
power
switch
VBUS
D+
D
GND
SHIELD
4.75 V(min)
downstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
low-ohmic
sense resistor
for overcurrent
detection
voltage drop
100 mV
(1)
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 24 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
The PCB resistance may cause a drop of 25 mV, which leaves 75 mV for the power
switch and overcurrent sense device. The voltage drop components are shown in
Figure 8.
For bus-powered hubs overcurrent protection is optional. It may be implemented for
all downstream ports on a global or individual basis.
12. Overcurrent detection
The ISP1122A has an analog overcurrent detection circuit for monitoring downstream
port lines. This circuit automatically reports an overcurrent condition to the host and
turns off the power to the faulty port. The host must reset the condition flag.
Pins OC1 to OC5/GOC are used for individual port overcurrent detection. Pin
OC5/GOC can also be used for global overcurrent detection. This is controlled by
input INDV (see Table 4).
The overcurrent detection circuit can be switched off using an external EEPROM (see
Table 23). In this case, the overcurrent pins OCn function as logic inputs (TTL level).
12.1 Overcurrent circuit description
The integrated overcurrent detection circuit of ISP1122A senses the voltage drop
across the power switch or an extra low-ohmic sense resistor. When the port draws
too much current, the voltage drop across the power switch exceeds the trip voltage
threshold (Vtrip). The overcurrent circuit detects this and switches off the power
switch control signal after a delay of 15 ms (ttrip). This delay acts as a ‘debounce’
period to minimize false tripping, especially during the inrush current produced by ‘hot
plugging’ of a USB device.
12.2 Power switch selection
From the voltage drop analysis given in Figure 6,Figure 7 and Figure 8, the power
switch has a voltage drop budget of 75 mV. For individual self-powered mode, the
current drawn per port can be up to 500 mA. Thus the power switch should have
maximum on-resistance of 150 m.
If the voltage drop due to the hub board resistance can be minimized, the power
switch can have more voltage drop budget and therefore a higher on-resistance.
Power switches with a typical on-resistance of around 100 mfit into this application.
(1) Includes PCB traces, ferrite beads, etc.
Fig 8. Typical voltage drop components in bus-powered mode (no overcurrent detection).
04aa06
low-ohmic
PMOS switch
ISP1122A
power
switch
VBUS
D+
D
GND
SHIELD
VBUS
D+
D
GND
SHIELD
4.40 V(min)4.50 V(min)
downstream
port
connector
upstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
(1)
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 25 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
The ISP1122A overcurrent detection circuit has been designed with a nominal trip
voltage (Vtrip) of 85 mV. This gives a typical trip current of approximately 850 mA for
a power switch with an on-resistance of 100 m1.
12.3 Tuning the overcurrent trip voltage
The ISP1122A trip voltage can optionally be adjusted through external components
to set the desired trip current. This is done by inserting tuning resistors at pins SP/BP
or OCn (see Figure 9). Rtu tunes up the trip voltage Vtrip and Rtd tunes it down
according to Equation 1.
(1)
with Iref(nom) =5µA and IOC(nom) = 0.5 µA.
12.4 Reference circuits
Some typical examples of port power switching and overcurrent detection modes are
given in Figure 10 to Figure 13.
The RC circuit (47 kand 0.1 µF) around the PMOS switch provides for soft turn-on.
The series resistor connecting the SP/BP pin to VCC tunes up the overcurrent trip
voltage slightly (see Figure 9). In the schematic diagram the resistor separates the
net names for pins VCC and SP/BP. This allows an automatic router to use a wide
trace for VCC and a narrow trace to connect pin SP/BP.
1. The following PMOS power switches have been tested to work well with the ISP1122A: Philips PHP109, Vishay Siliconix Si2301DS,
Fairchild FDN338P.
Vtrip Vtrip intrinsic()
Iref Rtu
IOC Rtd
+=
Iref(nom) =5µA
IOC(nom) = 0.5 µAIOC(nom) = 0.5 µA
a. Self-powered mode. b. Bus-powered mode.
Fig 9. Tuning the overcurrent trip voltage.
handbook, halfpage
MBL167
VCC Iref
Rtu Rtd
low-ohmic
PMOS switch
VCC SP/BP
ISP1122A
OCn
IOC
handbook, halfpage
MBL168
VBUS
Rtd
low-ohmic
PMOS switch
VCC SP/BP
ISP1122A
OCn
IOC
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 26 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Power switches 1 to 5 are low-ohmic PMOS devices as specified in Section 12.2.
Fig 10. Mode 5: self-powered hub; individual port power switching; individual overcurrent detection.
MBL170
handbook, full pagewidth
INDV
OPTION
PSW1/GL1
PSW5/GL5/GPSW
PSW4/GL4
PSW3/GL3
SP/BP
OC5/GOC
PSW2/GL2
OC1
OC2
OC3
OC4
5 V
POWER SUPPLY
± 3% 1
+VBUS
D+
D
GND
SHIELD
+4.85 V(min)
+4.85 V(min)
+4.75 V
(min) 1
2VBUS
D+
D
GND
SHIELD
+4.75 V
(min) 2
3
3VBUS
D+
D
GND
SHIELD
+4.75 V
(min)
VCC
GND
330 k
(5×)
100
to
1 k
4
5
VBUS
D+
D
GND
SHIELD
+4.75 V
(min) 4
120
µF
VBUS
D+
D
GND
SHIELD
+4.75 V
(min) 5
ferrite bead
downstream
ports
ISP1122A
120
µF
ferrite bead
120
µF
ferrite bead
120
µF
ferrite bead
120
µF
ferrite bead
low-ohmic
PMOS switch
47 k
0.1 µF
low-ohmic
PMOS switch
47 k
0.1 µF
low-ohmic
PMOS switch
47 k
0.1 µF
low-ohmic
PMOS switch
47 k
0.1 µF
low-ohmic
PMOS switch
47 k
0.1 µF
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 27 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Power switch is low-ohmic PMOS device as specified in Section 12.2.
Fig 11. Mode 1: self-powered hub; ganged port power switching; global overcurrent detection.
handbook, full pagewidth
MBL171
INDV
OPTION
PSW1/GL1
PSW5/GL5/GPSW
PSW4/GL4
PSW3/GL3
SP/BP
OC5/GOC
PSW2/GL2
OC1
OC2
OC3
OC4
low-ohmic
sense resistor
for overcurrent
detection
ISP1122A
5.1 V KICK-UP
POWER SUPPLY
± 3%
++4.95 V(min)
+4.95 V(min) VCC
GND
330
k
VBUS
D+
D
GND
SHIELD
+4.75 V
(min) 1
downstream
ports
120
µF
ferrite bead
VBUS
D+
D
GND
SHIELD
+4.75 V
(min) 2
120
µF
ferrite bead
VBUS
D+
D
GND
SHIELD
+4.75 V
(min) 3
120
µF
ferrite bead
VBUS
D+
D
GND
SHIELD
+4.75 V
(min) 4
120
µF
ferrite bead
VBUS
D+
D
GND
SHIELD
+4.75 V
(min) 5
120
µF
ferrite bead
100
to
1 k
low-ohmic
PMOS switch
47 k
0.1 µF
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 28 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Power switches 1 to 4 are low-ohmic PMOS devices as specified in Section 12.2.
Fig 12. Mode 4: bus-powered hub; individual port power switching; individual overcurrent detection.
handbook, full pagewidth
MBL172
INDV
OPTION
PSW1/GL1
PSW5/GL5/GPSW
PSW4/GL4
PSW3/GL3
SP/BP
OC5/GOC
PSW2/GL2
OC1
OC2
OC3
OC4
ISP1122A
VBUS
D+
D
GND
SHIELD
+4.50 V(min)
upstream
port
VCC
GND
1
2
3
4
+4.40 V
(min)
VBUS
D+
D
GND
SHIELD
1
downstream
ports
120
µF
ferrite bead
+4.40 V
(min)
VBUS
D+
D
GND
SHIELD
2
120
µF
ferrite bead
+4.40 V
(min)
VBUS
D+
D
GND
SHIELD
3
120
µF
ferrite bead
+4.40 V
(min)
VBUS
D+
D
GND
SHIELD
4
120
µF
ferrite bead
330 k
(4×)
low-ohmic
PMOS switch
47 k
0.1 µF
low-ohmic
PMOS switch
47 k
0.1 µF
low-ohmic
PMOS switch
47 k
0.1 µF
low-ohmic
PMOS switch
47 k
0.1 µF
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 29 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Power switch is low-ohmic PMOS device as specified in Section 12.2.
Fig 13. Mode 0: bus-powered hub; ganged port power switching; global overcurrent detection.
MBL173
handbook, full pagewidth
INDV
OPTION
PSW1/GL1
PSW5/GL5/GPSW
PSW4/GL4
PSW3/GL3
SP/BP
OC5/GOC
PSW2/GL2
OC1
OC2
OC3
OC4
ISP1122A
VBUS
D+
D
GND
SHIELD
+4.50 V(min)
upstream
port
VCC
GND
330
k
VBUS
D+
D
GND
SHIELD
+4.40 V
(min) 1
downstream
ports
120
µF
ferrite bead
VBUS
D+
D
GND
SHIELD
+4.40 V
(min) 2
120
µF
ferrite bead
VBUS
D+
D
GND
SHIELD
+4.40 V
(min) 3
120
µF
ferrite bead
VBUS
D+
D
GND
SHIELD
+4.40 V
(min) 4
120
µF
ferrite bead
low-ohmic
PMOS switch
47 k
0.1 µF
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 30 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
13. Limiting values
[1] Equivalent to discharging a 100 pF capacitor via a 1.5 k resistor (Human Body Model).
[2] Values are given for device only; in-circuit Vesd(max) =±8000 V.
[3] For open-drain pins Vesd(max) =±2000 V.
Table 24: Absolute maximum ratings
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
VCC supply voltage 0.5 +6.0 V
VIinput voltage 0.5 VCC + 0.5 V
Ilatchup latchup current VI< 0 or VI>V
CC - 200 mA
Vesd electrostatic discharge voltage ILI <15µA[1][2] -±4000[3] V
Tstg storage temperature 60 +150 °C
Ptot total power dissipation - 95 mW
Table 25: Recommended operating conditions
Symbol Parameter Conditions Min Max Unit
VCC supply voltage 4.0 5.5 V
VIinput voltage 0 5.5 V
VI(AI/O) input voltage on analog I/O pins
(D+/D)0 3.6 V
VO(od) open-drain output pull-up voltage 0 5.5 V
Tamb operating ambient temperature 40 +85 °C
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 31 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
14. Static characteristics
[1] In ‘suspend’ mode the minimum voltage is 2.7 V.
[1] Bus-powered mode.
[2] Self-powered or hybrid-powered mode.
Table 26: Static characteristics; supply pins
V
CC
= 4.0 to 5.5 V; V
GND
=0V; T
amb
=
40 to
+
85
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Vreg(3.3) regulated supply voltage 3.0[1] 3.3 3.6 V
ICC operating supply current - 18 - mA
ICC(susp) suspend supply current 1.5 k pull-up on upstream
port D+ (pin DP0) - - 270 µA
no pull-up on upstream port
D+ (pin DP0) --80µA
Table 27: Static characteristics: digital pins
V
CC
= 4.0 to 5.5 V; V
GND
=0V; T
amb
=
40 to
+
85
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Input levels
VIL LOW-level input voltage - - 0.8 V
VIH HIGH-level input voltage 2.0 - - V
Schmitt trigger inputs
Vth(LH) positive-going threshold
voltage 1.4 - 1.9 V
Vth(HL) negative-going threshold
voltage 0.9 - 1.5 V
Vhys hysteresis voltage 0.4 - 0.7 V
Output levels
VOL LOW-level output voltage
(open drain outputs) IOL = 6 mA - - 0.4 V
IOL =20µA - - 0.1 V
Leakage current
ILI input leakage current - - ±1µA
Open-drain outputs
IOZ OFF-state output current - - ±1µA
Table 28: Static characteristics: overcurrent sense pins
V
CC
= 4.0 to 5.5 V; V
GND
=0V; T
amb
=
40 to
+
85
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Vtrip overcurrent detection
trip voltage on OCn pins V=V
CC VOCn [1] 65 85 105 mV
V=V
SP/BP VOCn [2]
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 32 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] D+ is the USB positive data pin (DPn); D is the USB negative data pin (DMn).
[2] Includes external resistors of 20 Ω±1% on both D+ and D.
[3] This voltage is available at pin Vreg(3.3).
[4] In ‘suspend’ mode the minimum voltage is 2.7 V.
15. Dynamic characteristics
[1] Dependent on the crystal oscillator start-up time.
Table 29: Static characteristics: analog I/O pins (D+, D)[1]
V
CC
= 4.0 to 5.5 V; V
GND
=0V; T
amb
=
40 to
+
85
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Input levels
VDI differential input sensitivity |VI(D+)VI(D)|0.2 - - V
VCM differential common mode
voltage includes VDI range 0.8 - 2.5 V
VIL LOW-level input voltage - - 0.8 V
VIH HIGH-level input voltage 2.0 - - V
Output levels
VOL LOW-level output voltage RL= 1.5 k to +3.6V - - 0.3 V
VOH HIGH-level output voltage RL=15k to GND 2.8 - 3.6 V
Leakage current
ILZ OFF-state leakage current - - ±10 µA
Capacitance
CIN transceiver capacitance pin to GND - - 20 pF
Resistance
ZDRV[2] driver output impedance steady-state drive 28 - 44
ZINP input impedance 10 - - M
Termination
VTERM[3] termination voltage for
upstream port pull-up (RPU)3.0[4] - 3.6 V
Table 30: Dynamic characteristics
V
CC
= 4.0 to 5.5 V; V
GND
=0V; T
amb
=
40 to
+
85
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Reset
tW(RESET) pulse width on input RESET crystal oscillator running 10 - - µs
crystal oscillator stopped - 2[1] -ms
Crystal oscillator
fXTAL crystal frequency - 6 - MHz
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 33 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] Operating modes 0, 1, 4 and 5; see Table 4.
[1] Test circuit: see Figure 22.
[2] Excluding the first transition from Idle state.
[3] Characterized only, not tested. Limits guaranteed by design.
Table 31: Dynamic characteristics: overcurrent sense pins
V
CC
= 4.0 to 5.5 V; V
GND
=0V; T
amb
=
40 to
+
85
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
ttrip overcurrent trip response time
from OCn LOW to PSWn HIGH see Figure 14 [1] --15ms
Table 32: Dynamic characteristics: analog I/O pins (D+, D); full-speed mode[1]
V
CC
= 4.0 to 5.5 V; V
GND
=0V;T
amb
=
40 to
+
85
°
C; C
L
= 50 pF; R
PU
= 1.5 k
on D
+
to V
TERM
.; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Driver characteristics
tFR rise time CL=50pF;
10 to 90% of |VOH VOL|4 - 20 ns
tFF fall time CL=50pF;
10 to 90% of |VOH VOL|4 - 20 ns
FRFM differential rise/fall time
matching (tFR/tFF)[2] 90 - 111.11 %
VCRS output signal crossover voltage [2][3] 1.3 - 2.0 V
Data source timing
tDJ1 source differential jitter for
consecutive transitions see Figure 15 [2][3] 3.5 - +3.5 ns
tDJ2 source differential jitter for
paired transitions see Figure 15 [2][3] 4- +4ns
tFEOPT source EOP width see Figure 16 [3] 160 - 175 ns
tFDEOP source differential data-to-EOP
transition skew see Figure 16 [3] 2- +5ns
Receiver timing
tJR1 receiver data jitter tolerance for
consecutive transitions see Figure 17 [3] 18.5 - +18.5 ns
tJR2 receiver data jitter tolerance for
paired transitions see Figure 17 [3] 9- +9ns
tFEOPR receiver SE0 width accepted as EOP;
see Figure 16 [3] 82--ns
tFST width of SE0 during differential
transition rejected as EOP;
see Figure 18 [3] --14ns
Hub timing (downstream ports configured as full-speed)
tFHDD hub differential data delay
(without cable) see Figure 19;
CL=0pF [3] --44ns
tFSOP data bit width distortion after
SOP see Figure 19 [3] 5- +5ns
tFEOPD hub EOP delay relative to tHDD see Figure 20 [3] 0 - 15 ns
tFHESK hub EOP output width skew see Figure 20 [3] 15 - +15 ns
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 34 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] Test circuit: see Figure 22.
[2] Excluding the first transition from Idle state.
[3] Characterized only, not tested. Limits guaranteed by design.
Table 33: Dynamic characteristics: analog I/O pins (D+, D); low-speed mode[1]
V
CC
= 4.0 to 5.5 V; V
GND
=0V;T
amb
=
40 to
+
85
°
C; C
L
= 50 pF; R
PU
= 1.5 k
on D
to V
TERM
; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Driver characteristics
tLR rise time CL= 200 to 600 pF;
10 to 90% of |VOH VOL|75 - 300 ns
tLF fall time CL= 200 to 600 pF;
10 to 90% of |VOH VOL|75 - 300 ns
LRFM differential rise/fall time
matching (tLR/tLF)[2] 80 - 125 %
VCRS output signal crossover voltage [2][3] 1.3 - 2.0 V
Hub timing (downstream ports configured as low-speed)
tLHDD hub differential data delay see Figure 19 - - 300 ns
tLSOP data bit width distortion after
SOP see Figure 19 [3] 60 - +60 ns
tLEOPD hub EOP delay relative to tHDD see Figure 20 [3] 0 - 200 ns
tLHESK hub EOP output width skew see Figure 20 [3] 300 - +300 ns
Overcurrent input: OCn; power switch output: PSWn.
Reference voltage for overcurrent sensing: VCC (bus-powered mode) or VSP/BP (self-powered mode).
Fig 14. Overcurrent trip response timing.
MBL032
VCC
0 V
overcurrent
input
VCC
0 V
power switch
output
ttrip
Vtrip
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 35 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
TPERIOD is the bit duration corresponding with the USB data rate.
Fig 15. Source differential data jitter.
MGR870
TPERIOD
differential
data lines
crossover point crossover point crossover point
consecutive
transitions
N × TPERIOD + tDJ1 paired
transitions
N × TPERIOD + tDJ2
+3.3 V
0 V
TPERIOD is the bit duration corresponding with the USB data rate.
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timings a prefix ‘L’.
Fig 16. Source differential data-to-EOP transition skew and EOP width.
MGR776
TPERIOD
differential
data lines
crossover point
differential data to
SE0/ EOP skew
N × TPERIOD + tDEOP
source EOP width: tEOPT
receiver EOP width: tEOPR
crossover point
extended
+3.3 V
0 V
TPERIOD is the bit duration corresponding with the USB data rate.
Fig 17. Receiver differential data jitter.
MGR871
TPERIOD
tJR
differential
data lines
consecutive
transitions
N × TPERIOD + tJR1 paired
transitions
N × TPERIOD + tJR2
+3.3 V
0 V tJR1 tJR2
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 36 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Fig 18. Receiver SE0 width tolerance.
MGR872
differential
data lines
+3.3 V
0 V
tFST
VIH(min)
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timings a prefix ‘L’.
Fig 19. Hub differential data delay and SOP distortion.
MGR777
SOP distortion:
tSOP = tHDD (next J) tHDD(SOP)
(A) downstream hub delay (B) upstream hub delay
upstream
differential
data lines
hub delay
downstream
tHDD
hub delay
upstream
tHDD
downstream
differential
data lines
downstream
differential
data
upstream
differential
data
crossover
point crossover
point
crossover
point
crossover
point
+3.3 V
0 V
+3.3 V
0 V
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 37 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
[1] fSCL =164fXTAL.
[2] Rise time is determined by Cb and pull-up resistor value Rp (typ. 4.7 k).
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timings a prefix ‘L’.
Fig 20. Hub EOP delay and EOP skew.
MGR778
tEOP+
tEOPtEOP+
tEOP
crossover
point
extended
crossover
point
extended
EOP delay:
tEOP = max (tEOP, tEOP+)
EOP delay relative to t HDD:
tEOPD = tEOP t HDD
EOP skew:
tHESK = tEOP+ tEOP
(A) downstream EOP delay (B) upstream EOP delay
upstream
differential
data lines downstream
port
crossover
point
extended
crossover
point
extended
upstream
end of cable
downstream
differential
data lines
+3.3 V
0 V
+3.3 V
0 V
Table 34: Dynamic characteristics: I2C-bus pins (SDA, SCL)
V
CC
and T
amb
within recommended operating range; V
DD
=
+5 V; V
SS
=V
GND
; V
IL
and V
IH
between V
SS
and V
DD
.
Symbol Parameter Conditions Min Typ Max Unit
fSCL SCL clock frequency fXTAL = 6 MHz 0 93.75[1] 100 kHz
tBUF bus free time 4.7 - - µs
tSU;STA START condition set-up time 250 - - ns
tHD;STA hold time START condition 4.0 - - µs
tLOW SCL LOW time 4.7 - - µs
tHIGH SCL HIGH time 4.0 - - µs
trSCL and SDA rise time [2] - - 1000 ns
tfSCL and SDA fall time - - 300 ns
tSU;DAT data set-up time 250 - - ns
tHD;DAT data hold time 0 - - µs
tVD;DAT SCL LOW to data out valid
time - - 0.4 µs
tSU;STO STOP condition set-up time 4.0 - - µs
Cbcapacitive load for each bus
line - - 400 pF
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 38 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
16. Test information
The dynamic characteristics of the analog I/O ports (D+and D−) as listed in Table 32
and Table 33, were determined using the circuit shown in Figure 22.
Fig 21. I2C-bus timing.
PS S P
MGR779
tHD;STA
tBUF tHD;STA
tSU;STA
tSU;DAT
tf
tHIGH tSU;STO
tr
tHD;STA
tLOW
SDA
SCL
Load capacitance:
CL= 50 pF (full-speed mode)
CL= 200 pF or 600 pF (low-speed mode, minimum or maximum timing).
Speed selection:
full-speed mode (FS): 1.5 k pull-up resistor on D+
low-speed mode (LS): 1.5 k pull-up resistor on D.
Fig 22. Load impedance for D+ and D- pins.
MGR775
S1
S1
test point
test
closed
closed
open
open
D/LS
D+/LS
D/FS
D+/FS
CL
Vreg(3.3)
15 k
RPU
1.5 k
20
D.U.T.
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 39 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
17. Package outline
Fig 23. SO32 package outline.
UNIT A
max. A1A2A3bpcD
(1) E(1) eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
mm
inches
2.65
0.10
0.25
0.01
1.4
0.055
0.3
0.1 2.45
2.25 0.49
0.36 0.27
0.18 20.7
20.3 7.6
7.4 1.27 10.65
10.00 1.2
1.0 0.95
0.55 8
0
o
o
0.25 0.1
0.004
0.25
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
1.1
0.4
SOT287-1 MO-119
(1)
0.012
0.004 0.096
0.086 0.02
0.01 0.050 0.047
0.039
0.419
0.394
0.30
0.29
0.81
0.80
0.011
0.007 0.037
0.022
0.010.01
0.043
0.016
wM
bp
D
HE
Z
e
c
vMA
X
A
y
32 17
16
1
θ
A
A1
A2
Lp
Q
detail X
L
(A )
3
E
pin 1 index
0 5 10 mm
scale
SO32: plastic small outline package; 32 leads; body width 7.5 mm SOT287-1
97-05-22
99-12-27
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 40 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Fig 24. SDIP32 package outline.
UNIT b1cEe M
H
L
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
mm
DIMENSIONS (mm are the original dimensions)
SOT232-1 92-11-17
95-02-04
bmax.
w
ME
e1
1.3
0.8 0.53
0.40 0.32
0.23 29.4
28.5 9.1
8.7 3.2
2.8 0.181.778 10.16 10.7
10.2 12.2
10.5 1.6
4.7 0.51 3.8
MH
c(e )
1
ME
A
L
seating plane
A1
wM
b1
e
D
A2
Z
32
1
17
16
b
E
pin 1 index
0 5 10 mm
scale
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
(1) (1)
D(1)
Z
A
max. 12
A
min. A
max.
SDIP32: plastic shrink dual in-line package; 32 leads (400 mil) SOT232-1
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 41 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Fig 25. LQFP32 package outline.
UNIT A
max. A1A2A3bpcE
(1) eH
ELL
pZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
mm 1.60 0.20
0.05 1.45
1.35 0.25 0.4
0.3 0.18
0.12 7.1
6.9 0.8 9.15
8.85 0.9
0.5 7
0
o
o
0.25 0.11.0 0.2
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
0.75
0.45
SOT358 -1 136E03 MS-026 99-12-27
00-01-19
D(1) (1)(1)
7.1
6.9
HD
9.15
8.85
E
Z
0.9
0.5
D
bp
e
θ
EA1
A
Lp
detail X
L
(A )
3
B
8
c
D
H
bp
E
HA2
vMB
D
ZD
A
ZE
e
vMA
X
1
32
25
24 17
16
9
y
pin 1 index
wM
wM
0 2.5 5 mm
scale
LQFP32: plastic low profile quad flat package; 32 leads; body 7 x 7 x 1.4 mm SOT358-1
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 42 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
18. Soldering
18.1 Introduction
This text gives a very brief insight to a complex technology. A more in-depth account
of soldering ICs can be found in our
Data Handbook IC26; Integrated Circuit
Packages
(document order number 9398 652 90011).
There is no soldering method that is ideal for all IC packages. Wave soldering is often
preferred when through-hole and surface mount components are mixed on one
printed-circuit board. However, wave soldering is not always suitable for surface
mount ICs, or for printed-circuit boards with high population densities. In these
situations reflow soldering is often used.
18.2 Surface mount packages
18.2.1 Reflow soldering
Reflow soldering requires solder paste (a suspension of fine solder particles, flux and
binding agent) to be applied to the printed-circuit board by screen printing, stencilling
or pressure-syringe dispensing before package placement.
Several methods exist for reflowing; for example, infrared/convection heating in a
conveyor type oven. Throughput times (preheating, soldering and cooling) vary
between 100 and 200 seconds depending on heating method.
Typical reflow peak temperatures range from 215 to 250 °C. The top-surface
temperature of the packages should preferable be kept below 230 °C.
18.2.2 Wave soldering
Conventional single wave soldering is not recommended for surface mount devices
(SMDs) or printed-circuit boards with a high component density, as solder bridging
and non-wetting can present major problems.
To overcome these problems the double-wave soldering method was specifically
developed.
If wave soldering is used the following conditions must be observed for optimal
results:
Use a double-wave soldering method comprising a turbulent wave with high
upward pressure followed by a smooth laminar wave.
For packages with leads on two sides and a pitch (e):
larger than or equal to 1.27 mm, the footprint longitudinal axis is preferred to be
parallel to the transport direction of the printed-circuit board;
smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the
transport direction of the printed-circuit board.
The footprint must incorporate solder thieves at the downstream end.
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 43 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
For packages with leads on four sides, the footprint must be placed at a 45° angle
to the transport direction of the printed-circuit board. The footprint must
incorporate solder thieves downstream and at the side corners.
During placement and before soldering, the package must be fixed with a droplet of
adhesive. The adhesive can be applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the adhesive is cured.
Typical dwell time is 4 seconds at 250 °C. A mildly-activated flux will eliminate the
need for removal of corrosive residues in most applications.
18.2.3 Manual soldering
Fix the component by first soldering two diagonally-opposite end leads. Use a low
voltage (24 V or less) soldering iron applied to the flat part of the lead. Contact time
must be limited to 10 seconds at up to 300 °C.
When using a dedicated tool, all other leads can be soldered in one operation within
2 to 5 seconds between 270 and 320 °C.
18.3 Through-hole mount packages
18.3.1 Soldering by dipping or by solder wave
The maximum permissible temperature of the solder is 260 °C; solder at this
temperature must not be in contact with the joints for more than 5 seconds. The total
contact time of successive solder waves must not exceed 5 seconds.
The device may be mounted up to the seating plane, but the temperature of the
plastic body must not exceed the specified maximum storage temperature (Tstg(max)).
If the printed-circuit board has been pre-heated, forced cooling may be necessary
immediately after soldering to keep the temperature within the permissible limit.
18.3.2 Manual soldering
Apply the soldering iron (24 V or less) to the lead(s) of the package, either below the
seating plane or not more than 2 mm above it. If the temperature of the soldering iron
bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit
temperature is between 300 and 400 °C, contact may be up to 5 seconds.
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 44 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
18.4 Package related soldering information
[1] All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the
maximum temperature (with respect to time) and body size of the package, there is a risk that internal
or external package cracks may occur due to vaporization of the moisture in them (the so called
popcorn effect). For details, refer to the Drypack information in the
Data Handbook IC26; Integrated
Circuit Packages; Section: Packing Methods
.
[2] For SDIP packages, the longitudinal axis must be parallel to the transport direction of the
printed-circuit board.
[3] These packages are not suitable for wave soldering as a solder joint between the printed-circuit board
and heatsink (at bottom version) can not be achieved, and as solder may stick to the heatsink (on top
version).
[4] If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave
direction. The package footprint must incorporate solder thieves downstream and at the side corners.
[5] Wave soldering is only suitable for LQFP, QFP and TQFP packages with a pitch (e) equal to or larger
than 0.8 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.
[6] Wave soldering is only suitable for SSOP and TSSOP packages with a pitch (e) equal to or larger than
0.65 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.
Table 35: Suitability of IC packages for wave, reflow and dipping soldering methods
Mounting Package Soldering method
Wave Reflow[1] Dipping
Through-hole
mount DBS, DIP, HDIP, SDIP, SIL suitable[2] suitable
Surface mount BGA, LFBGA, SQFP,
TFBGA not suitable suitable
HBCC, HLQFP, HSQFP,
HSOP, HTQFP, HTSSOP,
SMS
not suitable[3] suitable
PLCC[4], SO, SOJ suitable suitable
LQFP, QFP, TQFP not recommended[4][5] suitable
SSOP, TSSOP, VSO not recommended[6] suitable
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 45 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
19. Revision history
Table 36: Revision history
Rev Date CPCN Description
0220000606Product specification; second version. Supersedes ISP1122A-01 of 27 March 2000
(9397 750 06986).
01 20000327 Preliminary specification; initial version.
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 46 of 48
9397 750 07175 © Philips Electronics N.V. 2000 All rights reserved.
20. Data sheet status
[1] Please consult the most recently issued data sheet before initiating or completing a design.
21. Definitions
Short-form specification — The data in a short-form specification is
extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with
the Absolute Maximum Rating System (IEC 60134). Stress above one or
more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any
other conditions above those given in the Characteristics sections of the
specification is not implied. Exposure to limiting values for extended periods
may affect device reliability.
Application information — Applications that are described herein for any
of these products are for illustrative purposes only. Philips Semiconductors
make no representation or warranty that such applications will be suitable for
the specified use without further testing or modification.
22. Disclaimers
Life support — These products are not designed for use in life support
appliances, devices, or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors
customers using or selling these products for use in such applications do so
at their own risk and agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to
make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve
design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no
licence or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products
are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
23. Licenses
24. Trademarks
ACPI — is an open industry specification for PC power management,
co-developed by Intel Corp., Microsoft Corp. and Toshiba
GoodLink — is a trademark of Royal Philips Electronics
OnNow — is a trademark of Microsoft Corp.
SMBus — is a bus specification for PC power management, developed by
Intel Corp. based on the I2C-bus from Royal Philips Electronics
SoftConnect — is a trademark of Royal Philips Electronics
Datasheet status Product status Definition[1]
Objective specification Development This data sheet contains the design target or goal specifications for product development. Specification may
change in any manner without notice.
Preliminary specification Qualification This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design and
supply the best possible product.
Product specification Production This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any
time without notice in order to improve design and supply the best possible product.
Purchase of Philips I2C components
Purchase of Philips I2C components conveys a license
under the Philips’ I2C patent to use the components in the
I2C system provided the system conforms to the I2C
specification defined by Philips. This specification can be
ordered using the code 9398 393 40011.
Philips Semiconductors ISP1122A
USB stand-alone hub
Product specification Rev. 02 — 6 June 2000 47 of 48
9397 750 07175 © Philips Electronics N.V. 2000. All rights reserved.
Philips Semiconductors - a worldwide company
Argentina: see South America
Australia: Tel. +61 2 9704 8141, Fax. +61 2 9704 8139
Austria: Tel. +43 160 101, Fax. +43 160 101 1210
Belarus: Tel. +375 17 220 0733, Fax. +375 17 220 0773
Belgium: see The Netherlands
Brazil: see South America
Bulgaria: Tel. +359 268 9211, Fax. +359 268 9102
Canada: Tel. +1 800 234 7381
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Colombia: see South America
Czech Republic: see Austria
Denmark: Tel. +45 3 288 2636, Fax. +45 3 157 0044
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Yugoslavia: Tel. +381 11 3341 299, Fax. +381 11 3342 553
For all other countries apply to: Philips Semiconductors,
International Marketing & Sales Communications,
Building BE, P.O. Box 218, 5600 MD EINDHOVEN,
The Netherlands, Fax. +31 40 272 4825
Internet: http://www.semiconductors.philips.com
(SCA69)
© Philips Electronics N.V. 2000. Printed in The Netherlands
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner.
The information presented in this document does not form part of any quotation or
contract, is believed to be accurate and reliable and may be changed without notice. No
liability will be accepted by the publisher for any consequence of its use. Publication
thereof does not convey nor imply any license under patent- or other industrial or
intellectual property rights.
Date of release: 6 June 2000 Document order number: 9397 750 07175
Contents
Philips Semiconductors ISP1122A
USB stand-alone hub
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 2
4 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 3
5.1 ISP1122AD (SO32) and ISP1122ANB (SDIP32) 3
5.1.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.2 ISP1122ABD (LQFP32) . . . . . . . . . . . . . . . . . . 6
5.2.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 Functional description . . . . . . . . . . . . . . . . . . . 8
6.1 Analog transceivers . . . . . . . . . . . . . . . . . . . . . 8
6.2 Philips Serial Interface Engine (SIE). . . . . . . . . 9
6.3 Hub repeater. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.4 End-of-frame timers . . . . . . . . . . . . . . . . . . . . . 9
6.5 General and individual port controller. . . . . . . . 9
6.6 GoodLink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.7 Bit clock recovery . . . . . . . . . . . . . . . . . . . . . . . 9
6.8 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . 9
6.9 PLL clock multiplier. . . . . . . . . . . . . . . . . . . . . 10
6.10 Overcurrent detection. . . . . . . . . . . . . . . . . . . 10
6.11 I2C-bus interface. . . . . . . . . . . . . . . . . . . . . . . 10
7 Modes of operation . . . . . . . . . . . . . . . . . . . . . 10
8 Endpoint descriptions. . . . . . . . . . . . . . . . . . . 11
8.1 Hub endpoint 0 (control). . . . . . . . . . . . . . . . . 11
8.2 Hub endpoint 1 (interrupt). . . . . . . . . . . . . . . . 11
9 Host requests. . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1 Standard requests . . . . . . . . . . . . . . . . . . . . . 12
9.2 Hub specific requests . . . . . . . . . . . . . . . . . . . 13
9.3 Descriptors . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9.4 Hub responses . . . . . . . . . . . . . . . . . . . . . . . . 18
9.4.1 Get device status . . . . . . . . . . . . . . . . . . . . . . 18
9.4.2 Get configuration . . . . . . . . . . . . . . . . . . . . . . 18
9.4.3 Get interface status. . . . . . . . . . . . . . . . . . . . . 18
9.4.4 Get hub status . . . . . . . . . . . . . . . . . . . . . . . . 18
9.4.5 Get port status . . . . . . . . . . . . . . . . . . . . . . . . 19
9.4.6 Get configuration descriptor . . . . . . . . . . . . . . 20
9.4.7 Get device descriptor . . . . . . . . . . . . . . . . . . . 20
9.4.8 Get hub descriptor . . . . . . . . . . . . . . . . . . . . . 20
9.4.9 Get string descriptor (0) . . . . . . . . . . . . . . . . . 20
9.4.10 Get string descriptor (1) . . . . . . . . . . . . . . . . . 20
9.4.11 Get string descriptor (2) . . . . . . . . . . . . . . . . . 20
10 I2C-bus interface . . . . . . . . . . . . . . . . . . . . . . . 20
10.1 Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
10.2 Hardware connections . . . . . . . . . . . . . . . . . . 21
10.3 Data transfer. . . . . . . . . . . . . . . . . . . . . . . . . . 21
11 Hub power modes . . . . . . . . . . . . . . . . . . . . . . 22
11.1 Voltage drop requirements . . . . . . . . . . . . . . . 22
11.1.1 Self-powered hubs . . . . . . . . . . . . . . . . . . . . . 22
11.1.2 Bus-powered hubs . . . . . . . . . . . . . . . . . . . . . 23
12 Overcurrent detection . . . . . . . . . . . . . . . . . . . 24
12.1 Overcurrent circuit description . . . . . . . . . . . . 24
12.2 Power switch selection . . . . . . . . . . . . . . . . . . 24
12.3 Tuning the overcurrent trip voltage. . . . . . . . . 25
12.4 Reference circuits. . . . . . . . . . . . . . . . . . . . . . 25
13 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 30
14 Static characteristics. . . . . . . . . . . . . . . . . . . . 31
15 Dynamic characteristics . . . . . . . . . . . . . . . . . 32
16 Test information. . . . . . . . . . . . . . . . . . . . . . . . 38
17 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 39
18 Soldering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
18.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 42
18.2 Surface mount packages . . . . . . . . . . . . . . . . 42
18.2.1 Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 42
18.2.2 Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 42
18.2.3 Manual soldering. . . . . . . . . . . . . . . . . . . . . . . 43
18.3 Through-hole mount packages. . . . . . . . . . . . 43
18.3.1 Soldering by dipping or by solder wave . . . . . 43
18.3.2 Manual soldering. . . . . . . . . . . . . . . . . . . . . . . 43
18.4 Package related soldering information . . . . . . 44
19 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 45
20 Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 46
21 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
22 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
23 Licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
24 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . . 46