HEDR-8000 Series, HEDR-8100 Series, HEDR-8010 Series Reflective Optical Surface Mount Encoders Data Sheet Description Features The HEDR-8000/8100 Series encoders use reflective technology to sense rotary or linear position. This sensor consists of an LED light source and a photodetector IC in a single SO-8 surface mount package. When used with a reflective codewheel or codestrip, this device can sense rotary or linear position. Reflective Technology Surface Mount SO-8 Package Two Channel Quadrature Outputs for Direction Sensing Two Encoding Resolution Options: - 2.76 - 2.95 Lines/mm (70 - 75 Lines/inch) - 5.91 Lines/mm (150 Lines/inch) NOTE: HEDR-8000 series products are classified as MSL Level 3. Outline Drawing 8 7 6 5 1 NC 6.2 0.20 (0.244 0.008) 3.94 0.13 * (0.155 0.005) 3 A 1.97 REF. (0.078) REF. 1 2 3 PIN ONE INDICATOR LOCATION 4 VCC 4 1.270 TYP. (0.050) 0.38 0.08 (0.016 0.003) 1.40 0.02 (0.055 0.001) 3.18 0.13 (0.125 0.005) 0.700 R REF. (0.0276) 8 NC 7 B 6 GND 5 NOTES: *FLASH MAY ADD 0.38 (0.015) MAX. AT PARTING LINE. DIMENSIONS IN MILLIMETERS (INCHES). FOR THE 1CHANNEL HEDR-8010, PIN 6 IS CONSIDERED NC. 5.08 0.13 * (0.200 0.005) 1.84 REF. (0.072) 2 GND VLED 0.025 MIN. (0.001) 0.23 0.03 (0.009 0.001) 1.52 REF. (0.06) LEAD COPLANARITY 0.051 (0.002) 0.18 0.08 (0.007 0.003) 0.59 MIN. (0.023) ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE. The reflective surface mount optical encoders provide two square wave outputs in quadrature for count and direction information. These TTL compatible outputs correspond to the alternating reflective/non-reflective pattern of the codewheel or codestrip. The HEDR-8000/8100 series encoders can be used over a range of codewheel and codestrip resolutions. The HEDR-8000/8100 reflective encoder can operate from 2.76 to 2.95 lines per mm (70 to 75 lines per inch). The HEDR-8100 can be used with a codewheel or codestrip with 150 lines per inch (5.91 lines per mm). Applications The HEDR-8000/8100 series provides two channel motion sensing at a very low cost, making it ideal for high volume applications. Its small size and surface mount capability make it ideal for printers, copiers, card readers, and consumer product applications. Note: Avago Technologies encoders are not recommended for use in safety critical applications. Eg. ABS braking systems, power steering, life support systems and critical care medical equipment. Please contact sales representative if more clarification is needed. Theory of Operation The HEDR-8000/8100 series combines an emitter and a detector in a single surface mount SO-8 package. When used with a codewheel or codestrip, the reflective sensors translates rotary or linear motion into a two channel digital output. As seen in the block diagram, the HEDR-8000/8100 series has three key parts: a single light emitting diode (LED) light source, a photodetector IC with a set of uniquely configured photodiodes, and a pair of lenses molded into the package. The lens over the LED focuses light onto the codewheel or codestrip. Light is either reflected or not reflected back to the lens over the photodetector IC. As the codewheel rotates or codestrip passes by, an alternating pattern of light and dark corresponding to the pattern of the codewheel falls upon the photodiodes. This light is used to produce internal signals A and A, and B and B. As part of this "push-pull" detector system, these signals are fed through comparators to produce the final outputs for channels A and B. Block Diagram VLED R GND VCC CH A CH B GND 2 SIGNAL PROCESSING CIRCUITRY CODEWHEEL OR CODESTRIP Definitions Count (N): For rotary motion, the number of bar and window pairs or counts per revolution (CPR) of the codewheel. For linear motion, the number of bar and window pairs per unit length (lines per inch [LPI] or lines per mm [LPmm]). Optical Radius (Rop): For rotary motion, the distance from the codewheel's center of rotation to the center line connecting the two lenses of the encoder. One Cycle (C): 360 electrical degrees (e), 1 bar and window pair. Specular Reflectance (Rf ): a measure of a surface's reflective finish. This is quantified by the amount of light reflected when hit with an incident beam. A device called a scatterometer is used to quantify specular reflectance on a percent scale. (Contact factory for more information.) One Shaft Rotation: 360 mechanical degrees, N cycles (rotary motion only). Line Density: The number of reflective and non-reflective pairs per unit length, expressed as either lines per inch (LPI) or lines per mm (LPmm). Pulse Width (P): The number of electrical degrees that an output is high during one cycle, nominally 180e or 1/2 a cycle. Pulse Width Error (P): The deviation in electrical degrees of the pulse width from its ideal value of 180e. Gap (G): The distance from the top of the package to the surface of the reflective codewheel or codestrip. Radial and Tangential Misalignment Error (ER, ET): For rotary motion, mechanical misalignment in the radial and tangential directions relative to the codewheel. Angular Misalignment Error (EA): angular misalignment of the sensor in relation to the tangential direction. This applies for both rotary and linear motion. RADIAL State Width (S): The number of electrical degrees between a transition in the output of channel A and the neighboring transition in the output of channel B. There are 4 states per cycle, each nominally 90e. TANGENTIAL HEDR-8000 State Width Error (S): The deviation in electrical degrees of each state width from its ideal value of 90e. Phase (): The number of electrical degrees between the center of the high state on channel A and the center of the high state on channel B. This value is nominally 90e. SHAFT Phase Error (): The deviation in electrical degrees of the phase from its ideal value of 90e. CODEWHEEL Direction of Rotation: When the codewheel or codestrip moves in the direction from pin 1 to pin 4, as viewed when looking down on the lenses, channel B will lead channel A. If the codewheel or codestrip moves in the opposite direction, channel A will lead channel B. EA HEDR-8000 Output Waveforms C ALL FOUR STATES (S1 TO S4) ARE MAINTAINED. P CH. A AMPLITUDE S1 S2 S3 S4 f CH. B CODEWHEEL ROTATION OR LINEAR MOVEMENT 3 SHAFT CODEWHEEL Absolute Maximum Ratings Storage Temperature, TS -40C to 85C Operating Temperature, TA -10C to 85C Supply Voltage, VCC -0.5 V to 7 V Output Voltage, VO -0.5 V to VCC Output Current per Channel, IOUT -1.0 mA to 5 mA Note: Exposure to extreme light intensity (such as from flashbulbs or spotlights) can cause permanent damage to device. Recommended Operating Conditions Parameter Symbol Min. Temperature TA -10 Supply Voltage VCC 4.5 LED Current ILED 13 Load Capacitance CL Typ. Max. Units 85 C Notes 5.0 5.5 Volts Ripple < 100 mVp-p 15 18 mA See "Current Limiting Resistor for LED" 100 pF 2.7 K Pull-Up Velocity (rpm) x N/60 Count Frequency f 15 kHz Radial Misalignment ER 0.38 (0.015) mm (in.) Tangential Misalignment ET 0.38 (0.015) mm (in.) Angular Misalignment EA 0 1.5 deg. Codewheel or Codestrip Gap G 1.52 (0.060) 2.03 (0.080) 2.54 (0.100) mm (in.) HEDR-8000 HEDR-8010 G 1.02 (0.040) 1.52 (0.060) 2.03 (0.080) mm (in.) HEDR-8100 Codewheel or Codestrip Specular Reflectance Rf 60% Codewheel/Codestrip Tilt CT Codewheel/Codestrip Resolution LPmm (LPI) As Measured on TMA scan Scope (see Note 1) 0 2.76 (70) LPmm (LPI) 1 deg. 2.95 (75) lines/mm (lines/in.) HEDR-8000 HEDR-8010 lines/mm (lines/in.) HEDR-8100 5.91 150 Notes: 1. Contact factory for more information regarding measurement of specular reflectance. Encoding Characteristics Encoding Characteristics Over the Recommended Operating Conditions and Mounting Conditions. Parameter Symbol Typical Maximum Units Notes Pulse Width Error P 15 55 e HEDR-8010 Pulse Width Error (Ch.A,Ch.B) P 16 75 e HEDR-8100 Phase Error 10 60 e HEDR-8100 Pulse Width Error (Ch.A,Ch.B) P 15,25 55,75 e HEDR-8000 Phase Error 12 60 e HEDR-8000 Note: Typical Value was obtained at typical condition. Maximums were obtained over all range of recommended operating condition and mounting condition. 4 Electrical Characteristics Electrical Characteristics Over Recommended Operating Conditions. Typical Values at 25C. Parameter Symbol Min. Typ. Max. Units Supply Current ICC High Level Output Voltage VOH Low Level Output Voltage VOL 2.2 5.0 Notes mA 2.4 V IOH = -40 A min. 0.4 V IOL = 3.86 mA CL = 25 pF RL = 2.7 K Rise Time tr 150 200 ns Fall Time tf 50 60 ns Current Limiting Resistor for LED A resistor to limit current to the LED is required. The recommended value is 220 (10%) and should be placed in series between the 5 V supply and pin 8 of the device (VLED). This will result in an LED current of approximately 15 mA. Recommended Codewheel and Codestrip Characteristics Wb Ww Lw ROP Lw Ww Wb Parameter Symbol Min. Max. Window/Bar Ratio Ww/Wb 0.9 1.1 Rf 60 85 - 10 LPmm (LPI) 2.76 (70) 2.95 (75) lines/mm (lines/inch) HEDR-8000 HEDR-8010 LPmm (LPI) 5.91 (150) 7.09 (180) lines/mm (lines/inch) HEDR-8100 Lw 1.80 (0.071) 2.31 (0.091) mm (inches) mm (inches) Specular Reflectance Line Density Window Length Contact factory for further information on compatible codewheel and codestrips. 5 Units Notes Reflective Bars Non-reflective Bars Mounting Conditions 1 2 3 4 8 7 6 5 ROP 11.00 mm (0.433 IN.) < ROP < 2.03 0.51 (0.080 0.020) * These dimensions are for HEDR-8000. Please refer to "Recommended Operating Conditions" table for HEDR-8100. IR Soldering Conditions The following recommended IR soldering profile meets the specifications of the Electronic Industries Association of Japan (EIAJ): 1. 150 10C for 90 30 seconds 2. Greater than 200C for 30 10 seconds 3. 230C 5C for 10 1 second 30 10 S 10 1 S TEMPERATURE (C) 235C MAX. 230C 5C 200C 90 30 S 150C 10C TIME (S) RECOMMENDATION: Please refer to Application Note 1079: Design and Performance Considerations with HEDR-8000 for additional product information. 6 Ordering Information A. Modules HEDR-8 OPT 2 00 Resolution Type Lines/Inch Units in Shipping K = 75 LPI P = 150 LPI Q = 180 LPI 0 = Low resolution 1 = High resolution 0 * * HEDR-8000#2K HEDR-8100#2P HEDR-8100#2Q HEDR-8010#2K 0 = 50 units (Tube) 2 = 3 units (Tube) 3 = 100 units (Tube-Designers Kit) 4 = 1500 units (Tape and Reel) 5 = 500 units (Tape and Reel) 2 * * 3 * * * 4 * * * 5 * * B. Codewheel: reflective * HEDR-5120 OPT ROP = 11 mm, 2 channels Resolution (Cycle/Rev) Shaft Diameter E = 200 CPR H = 408 CPR 06 = 1/4 in. 1/2 = 6 mm HEDR-5120# E H 06 * * 12 * In order to achieve the reflective codewheel resolution stated, refer below for suitable encoder recommendation. 1. HEDR-5120#Exx, 200CPR to be used with option K, 75LPI of the encoder. 2. HEDR-5120#Hxx, 408CPR to be used with option P, 150LPI of the encoder. For product information and a complete list of distributors, please go to our web site: www.avagotech.com Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries. Data subject to change. Copyright (c) 2005-2012 Avago Technologies. All rights reserved. Obsoletes 5988-9452EN AV02-3613EN - June 12, 2012