APPLICATION NOTE
Atmel AVR600: STK600 Expansion, Routing and Socket
Boards
Atmel Microcontrollers
Introduction
This application note describes the process of developing new routing, socket and
expansion cards for the Atmel STK®600. It also describes the physical parameters for
creating such cards.
The STK600 starter kit from Atmel has a sandwich design to match a specific part
package and pin out to the generic pin headers. It also features an expansion area
where most part pins are available.
While the variety of IC packages is relatively limited, the number of possible pinouts
increases rapidly with the number of pins. I.e. a 6-pin IC can have 720 (6!) different
pinouts!
The routing / socket card design provides a lowcost solution to support upcoming
devices as the socket is the cost driving factor.
STK600 users might also want to create their own routing cards to include
specialized hardware to prototype their own design.
Figure 1. STK600 router and socket card.
8170C
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AVR
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03/2013
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Table of Contents
1.Routing Cards ...................................................................................... 3
1.1Connector footprints .......................................................................................... 3
1.2Physical dimensions and component placement .............................................. 4
1.3Atmel STK600 socket connectors pinout .......................................................... 5
1.3.1Signal descriptions .............................................................................. 8
2.Socket Cards ..................................................................................... 10
2.1Power design issues ....................................................................................... 10
2.2Connector MPN ............................................................................................... 10
2.3Physical dimensions and component placement ............................................ 10
3.Expansion Cards
................................................................................ 11
3.1Connector MPN ............................................................................................... 11
3.2Physical dimensions and component placement ............................................ 12
3.3Atmel STK600 expansion connectors pinout .................................................. 13
4.ID System .......................................................................................... 17
4.1Signal usage ................................................................................................... 17
4.2ID functions ..................................................................................................... 18
4.3Examples ........................................................................................................ 19
5.Design Example
................................................................................. 20
6.Revision History ................................................................................. 22
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1. Routing Cards
The routing cards sit between the generic socket card and the Atmel STK600. It has one pair of electric pads
underneath to mate with the STK600 spring loaded connector, and one pair of pads on top where the socket card
connector connects. A part specific card with the target IC soldered on can be viewed as a routing card without the top
pads.
1.1 Connector footprints
A routing card should have pads to mate with the following spring loaded connectors:
Table 1-1. Router card connectors.
Manufacturer and MPN Quantity Comment
SAMTEC, FSI-140-03-G-D-AD 2 80-pins to socket card (top)
SAMTEC, FSI-150-03-G-D-AD 2 100-pins to STK600 (bottom)
Figure 1-1. PCB land pattern for mating to FSI connectors.
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1.2 Physical dimensions and component placement
Figure 1-2. Routing card connector pad placement and dimensions.
Figure 1-3. Clip hole dimensions.
The board thickness should be 1.6mm to be compatible with the clips.
Note: Components on the main board might conflict with through hole mounted or secondary side mounted components.
Areas with such components are highlighted in Figure 1-4.
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Figure 1-4. Height restricted areas due to main board components.
1.3 Atmel STK600 socket connectors pinout
Figure 1-5 shows the pinout for the STK600 headers. This corresponds to the routing card connectors J1 and J2.
Figure 1-5. STK600 socket connectors’ pinout.
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Table 1-2. Atmel STK600 J201 left, routing card connector J1 pinout.
Signal name Pin number Signal name
VTG 2 1 GND
PA1 4 3 PA0
PA3 6 5 PA2
PA5 8 7 PA4
PA7 10 9 PA6
VTG 12 11 GND
PB1 14 13 PB0
PB3 16 15 PB2
PB5 18 17 PB4
PB7 20 19 PB6
VTG 22 21 GND
PC1 24 23 PC0
PC3 26 25 PC2
PC5 28 27 PC4
PC7 30 29 PC6
VTG 32 31 GND
PD1 34 33 PD0
PD3 36 35 PD2
PD5 38 37 PD4
PD7 40 39 PD6
VTG 42 41 GND
PE1 44 43 PE0
PE3 46 45 PE2
PE5 48 47 PE4
PE7 50 49 PE6
VTG 52 51 GND
PF1 54 53 PF0
PF3 56 55 PF2
PF5 58 57 PF4
PF7 60 59 PF6
VTG 62 61 GND
PG1 64 63 PG0
PG3 66 65 PG2
PG5 68 67 PG4
PG7 70 69 PG6
VTG 72 71 GND
PH1 74 73 PH0
PH3 76 75 PH2
PH5 78 77 PH4
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PH7 80 79 PH6
VTG 82 81 GND
AREF0 84 83 XTAL1
AREF1 86 85 XTAL2
TGT_MOSI 88 87 GND
TGT_MISO 90 89 TOSC1
TGT_SCK 92 91 TOSC2
TDI 94 93 TGT_RESET
TDO 96 95 GND
TMS 98 97 Vext
TCK 100 99 Vcc
Table 1-3. Atmel STK600 J202 right, routing card connector J2 pinout.
Signal name Pin number Signal name
VTG 2 1 GND
PJ1 4 3 PJ0
PJ3 6 5 PJ2
PJ5 8 7 PJ4
PJ7 10 9 PJ6
VTG 12 11 GND
PK1 14 13 PK0
PK3 16 15 PK2
PK5 18 17 PK4
PK7 20 19 PK6
VTG 22 21 GND
PL1 24 23 PL0
PL3 26 25 PL2
PL5 28 27 PL4
PL7 30 29 PL6
VTG 32 31 GND
PM1 34 33 PM0
PM3 36 35 PM2
PM5 38 37 PM4
PM7 40 39 PM6
VTG 42 41 GND
PN1 44 43 PN0
PN3 46 45 PN2
PN5 48 47 PN4
PN7 50 49 PN6
VTG 52 51 GND
PP1 54 53 PP0
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PP3 56 55 PP2
PP5 58 57 PP4
PP7 60 59 PP6
VTG 62 61 GND
PQ1 64 63 PQ0
PQ3 66 65 PQ2
PQ5 68 67 PQ4
PQ7 70 69 PQ6
VBUST 72 71 DP
UVCON 74 73 DN
Vcc 76 75 UID
Vext 78 77 GND
TGT_PDATA1 80 79 TGT_PDATA0
TGT_PDATA3 82 81 TGT_PDATA2
TGT_PDATA5 84 83 TGT_PDATA4
TGT_PDATA7 86 85 TGT_PDATA6
TGT_PCTRL1 88 87 TGT_PCTRL0
TGT_PCTRL3 90 89 TGT_PCTRL2
TGT_PCTRL5 92 91 TGT_PCTRL4
TGT_PCTRL7 94 93 TGT_PCTRL6
BOARD_ID1 96 95 BOARD_ID0
BOARD_ID3 98 97 BOARD_ID2
BOARD_ID5 100 99 BOARD_ID4
1.3.1 Signal descriptions
Table 1-4. Socket card connector pin description.
Atmel STK600 signal name MCU Comment
PAx, PBx etc PAx, PBx etc 1-to-1 MCU pin mapping
VTG Vcc Target supply rail controlled by Atmel AVR Studio® / STK600
GND GND
AREFx AREF Analog reference voltage, controlled by AVR Studio / STK600
XTALx XTALx Clock pins connected to oscillator on STK600
TGT_SCK, TGT_MISO, TGT_MOSI ISP pins ISP programming interface
TGT_TDI, TGT_TDO, TGT_TMS,
TGT_TCK JTAG pins JTAG programming interface
VBUST VBUS VBUS (sense) for USB
UID UID ID pin for USB OTG
UVCON UVCON
USB VBUS generation control for USB OTG. A low level on this
signal enables VBUS generation
DP, DN DP, DN USB differential pair
TGT_PDATA(0-7) (HV) data pins Data pins for high voltage (PP/HVSP) programming
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TGT_CTRL0 (HV) BS2
Control signals for High voltage Parallel Programming / Serial
Programming. Refer to AVR datasheet for further information.
On AVRs with common XA1/BS2, XA1 is used.
On AVRs with common BS1/PAGEL, BS1 is used.
TGT_CTRL1 (HV) Ready/Busy
TGT_CTRL2 (HV) /OE
TGT_CTRL3 (HV) /WR
TGT_CTRL4 (HV) BS1
TGT_CTRL5 (HV) XA0
TGT_CTRL6 (HV) XA1
TGT_CTRL7 (HV) PAGEL
BOARD_IDn none
ID system for router / socket / expansion cards, see Chapter 4 -
ID System
Notes: 1. Not all AVR will have every pin (ex. two aref pins, tosc or usb).
2. A MCU pin will fan-out to both Pnx pin and to the programming interface(s) located at that pin.
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2. Socket Cards
Socket cards route each pin from the IC socket to separate pins on the spring loaded connectors on the bottom side,
facing the routing card.
2.1 Power design issues
As all routing is handled by the routing card, even power lines and power decoupling is ignored at the socket card. This
produces less than ideal power design, which may lead to unwanted noise, ground bounce, and other effects. It should
therefore be expected that heavily loaded designs cannot run at full speed on the Atmel STK600. Likewise, such power
design is not recommended for custom designs.
2.2 Connector MPN
Table 2-1. Socket card connector.
Manufacturer and MPN Quantity Comment
SAMTEC, FSI-140-03-G-D-AD 2 Spring loaded 80-pin connector
2.3 Physical dimensions and component placement
Figure 2-1. Socket card connector placement and dimensions.
ST1
J1 J2
45°
Note!
105mm
94mm
66mm
7mm
The board thickness should be 1.6mm to be compatible with the clips.
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3. Expansion Cards
The Atmel STK600 features an expansion area where cards for custom peripherals like memory expansion, LCD etc
can be placed. STK600 routes all part pins and power to the expansion card connectors.
3.1 Connector MPN
Table 3-1. Expansion card connector.
Manufacturer and MPN Quantity Comment
FCI, 61082-101402LF 2
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3.2
Physical dimensions and component placement
Figure 3-1. Expansion card connector placement and dimensions.
There is no requirement to board thickness.
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3.3 Atmel STK600 expansion connectors pinout
Figure 3-2. Pinout for expansion connectors.
Table 3-2. STK600 J301 “expand0” connector pinout.
Signal name Pin number Signal name
VTG 2 1 GND
PA1 4 3 PA0
PA3 6 5 PA2
PA5 8 7 PA4
PA7 10 9 PA6
VTG 12 11 GND
PB1 14 13 PB0
PB3 16 15 PB2
PB5 18 17 PB4
PB7 20 19 PB6
VTG 22 21 GND
PC1 24 23 PC0
PC3 26 25 PC2
PC5 28 27 PC4
PC7 30 29 PC6
VTG 32 31 GND
PD1 34 33 PD0
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PD3 36 35 PD2
PD5 38 37 PD4
PD7 40 39 PD6
VTG 42 41 GND
PE1 44 43 PE0
PE3 46 45 PE2
PE5 48 47 PE4
PE7 50 49 PE6
VTG 52 51 GND
PF1 54 53 PF0
PF3 56 55 PF2
PF5 58 57 PF4
PF7 60 59 PF6
VTG 62 61 GND
PG1 64 63 PG0
PG3 66 65 PG2
PG5 68 67 PG4
PG7 70 69 PG6
VTG 72 71 GND
PH1 74 73 PH0
PH3 76 75 PH2
PH5 78 77 PH4
PH7 80 79 PH6
VTG 82 81 GND
AREF0 84 83 XTAL1
AREF1 86 85 XTAL2
TGT_MOSI 88 87 GND
TGT_MISO 90 89 TOSC1
TGT_SCK 92 91 TOSC2
TDI 94 93 TGT_RESET
TDO 96 95 Vcc6
TMS 98 97 GND
TCK 100 99 Vcc6
Table 3-3. Atmel STK600 J302 “expand1” connector pinout.
Signal name Pin number Signal name
VTG 2 1 GND
PJ1 4 3 PJ0
PJ3 6 5 PJ2
PJ5 8 7 PJ4
PJ7 10 9 PJ6
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VTG 12 11 GND
PK1 14 13 PK0
PK3 16 15 PK2
PK5 18 17 PK4
PK7 20 19 PK6
VTG 22 21 GND
PL1 24 23 PL0
PL3 26 25 PL2
PL5 28 27 PL4
PL7 30 29 PL6
VTG 32 31 GND
PM1 34 33 PM0
PM3 36 35 PM2
PM5 38 37 PM4
PM7 40 39 PM6
VTG 42 41 GND
PN1 44 43 PN0
PN3 46 45 PN2
PN5 48 47 PN4
PN7 50 49 PN6
VTG 52 51 GND
PP1 54 53 PP0
PP3 56 55 PP2
PP5 58 57 PP4
PP7 60 59 PP6
VTG 62 61 GND
PQ1 64 63 PQ0
PQ3 66 65 PQ2
PQ5 68 67 PQ4
PQ7 70 69 PQ6
Vext 72 71 GND
Vext 74 73 GND
GND 76 75 Vcc
GND 78 77 Vcc
TGT_PDATA1 80 79 TGT_PDATA0
TGT_PDATA3 82 81 TGT_PDATA2
TGT_PDATA5 84 83 TGT_PDATA4
TGT_PDATA7 86 85 TGT_PDATA6
TGT_PCTRL1 88 87 TGT_PCTRL0
TGT_PCTRL3 90 89 TGT_PCTRL2
TGT_PCTRL5 92 91 TGT_PCTRL4
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TGT_PCTRL7 94 93 TGT_PCTRL6
Vcc3 96 95 GND
BOARD_ID1 98 97 BOARD_ID0
BOARD_ID7 100 99 BOARD_ID6
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4. ID System
The Atmel STK600 features an ID system to identify which routing, socket and expansion card is attached. The STK600
can impose voltage limitations based on the IDs, and Atmel AVR Studio will notify the user if the combination is
incorrect.
The ID system consists of two common output and two board unique input signals. Each input is one of sixteen possible
values based in the input signals – giving a total ID space of 256.
Three IDs are reserved for custom use and can be implemented without use of ICs.
Table 4-1. IDs reserved for custom use.
Type ID
Board limited to 1.8V 0xCA
Board limited to 3.3V 0xCC
No limit on voltage 0xCF
The ID 0xff indicates no board present.
4.1 Signal usage
Table 4-2. ID system signal usage.
Name Direction Function
BOARD_ID0 Output (A) Common output to functions
BOARD_ID1 Output (B) Common output to functions
BOARD_ID2 Input Input from routing card
BOARD_ID3 Input Input from routing card
BOARD_ID4 Input Input from socket card
BOARD_ID5 Input Input from socket card
BOARD_ID6 Input Input from expansion card
BOARD_ID7 Input Input from expansion card
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4.2 ID functions
The functions and their output according to input A and B:
B A 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Functions as logic expressions:
Function Expression ID
0 0 0x0
1
B
A
+ 0x1
2
B
A
0x2
3
B
0x3
4
B
A
0x4
5
A
0x5
6 BA ⊕ 0x6
7
A
B 0x7
8
A
B 0x8
9 BA ⊕ 0x9
10
A
0xA
11
A
B
B
+ 0xB
12
B
0xC
13
B
A
B
⋅+ 0xD
14
B
A
+ 0xE
15 1 0xF
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4.3 Examples
For a socket card to report the ID 0xCA:
Route BOARD_ID1 to BOARD_ID4 and BOARD_ID0 to BOARD_ID5
Figure 4-1. Socket card ID example.
For an expansion card to report the ID 0xCF:
Route BOARD_ID0 to BOARD_ID6 and VCC to BOARD_ID7
Figure 4-2. Expansion card ID example.
For a router card to report the ID 0xCC:
Route BOARD_ID1 to both BOARD_ID2 and BOARD_ID3.
Figure 4-3. Routing card ID example.
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5. Design Example
To support a new package type one would typically start with designing the socket card. The pinout between the socket
card and routing card is not defined and left to the designer. An example is given in Figure 5-1.
Next is the design of the routing card (Figure 5-3). The routing card’s role is to connect each pin from the socket card to
the corresponding pin on the Atmel STK600. In addition to decoupling etc, the routing card should also fan-out the
correct signals to programming headers.
Each card in the stack has its own board_id pins; the routing card is responsible for passing on the signal to the socket
card.
Figure 5-1. Schema capture of socket card.
Both the socket and routing card must also include the clip holes:
Figure 5-2. Clip holes included in schematic.
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Figure 5-3. Schema capture of routing card.
Copyright © 2008, Atmel Corporation
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6. Revision History
Doc. Rev. Date Comments
8170C 03/2013 Example schematics for the ID system are updated
8170B 12/2010
8170A 10/2008 Initial document release
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