HEDR-8000 Series, HEDR-8100 Series, HEDR-8010 Series Reflective Optical Surface Mount Encoders Technical Data 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) 5.08 0.13 * (0.200 0.005) 1.84 REF. (0.072) 3.18 0.13 (0.125 0.005) 0.700 R REF. (0.0276) 2 GND 1.40 0.02 (0.055 0.001) 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. 0.025 MIN. (0.001) 0.23 0.03 (0.009 0.001) 1.52 REF. (0.06) LEAD COPLANARITY 0.051 (0.002) VLED 0.18 0.08 (0.007 0.003) 0.59 MIN. (0.023) HEDR-8000 outline drwg 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 CODEWHEEL OR CODESTRIP GND VCC CH A CH B SIGNAL PROCESSING CIRCUITRY GND HEDR-8000 block diag 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]). One Cycle (C): 360 electrical degrees (e), 1 bar and window pair. 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). 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.) 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 EA TANGENTIAL Pulse Width (P): The number of electrical degrees that an output is high during one cycle, nominally 180e or 1/2 a cycle. HEDR-8000 Pulse Width Error (P): The deviation in electrical degrees of the pulse width from its ideal value of 180e. 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. HEDR-8000 SHAFT SHAFT CODEWHEEL CODEWHEEL Output Waveforms HEDR-8000 angular misalign. C State Width Error (S): The deviation in electrical degrees of each state width from its ideal value of 90e. ALL FOUR STATES (S1 TO S4) ARE MAINTAINED. P CH. A 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. Phase Error (): The deviation in electrical degrees of the phase from its ideal value of 90e. 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. 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. Gap (G): The distance from the top of the package to the surface of the reflective codewheel or codestrip. AMPLITUDE S1 S2 S3 S4 f CH. B CODEWHEEL ROTATION OR LINEAR MOVEMENT HEDR-8000 output wave. Absolute Maximum Ratings Storage Temperature, TS Operating Temperature, TA Supply Voltage, VCC Output Voltage, VO Output Current per Channel, IOUT -40C to 85C -10C to 85C -0.5 V to 7 V -0.5 V to VCC -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. Typ. Max. Units Notes Temperature TA -10 85 C Supply Voltage VCC 4.5 5.0 5.5 Volts Ripple < 100 mVp-p LED Current ILED 13 15 18 mA See "Current Limiting Resistor for LED" Load Capacitance CL 100 pF 2.7 K Pull-Up Count Frequency f 15 kHz Velocity (rpm) x N/60 Radial Misalignment ER 0.38 mm (0.015) (in.) Tangential Misalignment ET 0.38 mm (0.015) (in.) Angular Misalignment EA 0 1.5 deg. Codewheel or Codestrip G 1.52 2.03 2.54 mm HEDR-8000 Gap (0.060) (0.080) (0.100) (in.) HEDR-8010 G 1.02 1.52 2.03 mm HEDR-8100 (0.040) (0.060) (0.080) (in.) Codewheel or Codestrip Rf 60% As Measured on TMA Specular Reflectance scan Scope (see Note 1) Codewheel/Codestrip Tilt CT 0 1 deg. Codewheel/Codestrip LPmm 2.76 2.95 lines/mm HEDR-8000 Resolution (LPI) (70) (75) (lines/in.) HEDR-8010 LPmm 5.91 lines/mm HEDR-8100 (LPI) 150 (lines/in.) 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 Pulse Width Error P 15 55 e Pulse Width Error (Ch.A,Ch.B) P 16 75 e Phase Error 10 60 e Pulse Width Error (Ch.A,Ch.B) P 15,25 55,75 e Phase Error 12 60 e Notes HEDR-8010 HEDR-8100 HEDR-8100 HEDR-8000 HEDR-8000 Note: Typical Value was obtained at typical condition. Maximums were obtained over all range of recommended operating condition and mounting condition. Electrical Characteristics Electrical Characteristics Over Recommended Operating Conditions. Typical Values at 25C. Parameter Symbol Min. Typ. Max. Units Notes Supply Current ICC 2.2 5.0 mA High Level Output Voltage VOH 2.4 V IOH = -40 A min. Low Level Output Voltage VOL 0.4 V IOL = 3.86 mA Rise Time tr 150 200 ns CL = 25 pF RL = 2.7 K 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. Window/Bar Ratio Ww/Wb 0.9 Specular Reflectance Rf 60 HEDR-8000 codewheel - Line Density LPmm 2.76 (LPI) (70) LPmm 5.91 (LPI) (150) Window Length Lw 1.80 (0.071) Max. Units Notes 1.1 85 Reflective Bars 10 Non-reflective Bars 2.95 lines/mm HEDR-8000 (75) (lines/inch) HEDR-8010 7.09 lines/mm HEDR-8100 (180) (lines/inch) 2.31 mm (inches) mm (0.091) (inches) Contact factory for further information on compatible codewheel and codestrips. Mounting Conditions 1 2 3 4 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 8 7 6 5 30 10 S 11.00 mm (0.433 IN.) < ROP < 2.03 0.51 (0.080 0.020) TEMPERATURE ( C) 10 1 S ROP 230 C 5 C 200 C 90 30 S 150 C 10 C TIME (S) *These dimensions are for HEDR-8000. Please refer to "Recommended Operating Conditions" table for HEDR-8100. HEDR-8000 mounting RECOMMENDATION: Please refer to Application Note 1079: Design and Performance Considerations with HEDR-8000 for additional product information. 235 C MAX. HEDR-8000 soldering Ordering Information A. Modules HEDR-8 OPT 2 00 Resolution Type Lines/Inch K = 75 LPI P = 150 LPI Q = 180 LPI 0 = Low resolution 1 = High resolution Units in Shipping 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) 0 2 HEDR-8000#2K * * HEDR-8100#2P * * HEDR-8100#2Q HEDR-8010#2K * 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, Pte. in the United States and other countries. Data subject to change. Copyright (c) 2006 Avago Technologies Pte. All rights reserved. 5988-9452EN - May 29, 2006