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| AEDR-8000 Series Reflective Surface Mount Optical Encoder Data Sheet Description By introducing an additional PCB top-up thickness attached to the encoder, the AEDR-8000 Encoder series could easily solve the height issue in various applications. Furthermore, this great feature is enhanced with the offering of different height profile options. Direct Replacement of HEDR-8000 Encoder series is now possible with the AEDR-8000 Encoder series. Such migration is always simple and easy due to the perfect matching of the height profiles as well as same footprints in both encoder series. The AEDR-8000 Encoder series employs reflective technology for rotary and linear movement control. The encoder houses an LED light source and a photodetecting circuitry in a single package. In adding on to the main features, The AEDR-8000 Encoder series offers two-channel quadrature digital outputs (TTL compatible) where signal could be interfaced directly with most of the signal processing circuitries. Thus, it's bound to reduce the design time of an application. Applications The AEDR-8000 Encoder series provides motion sensing at a competitive price, making it ideal for high volume applications. Its small size and surface mount package make it ideal for printers, copiers, card readers and many consumer products, particularly where space and weight are design constraints. Features * Reflective technology * Surface mount small outline leadless package * Direct replacement of HEDR-8000 encoder * Single channel incremental output * Two channels quadrature outputs for direction sensing * Single 5 V supply, TTL compatible output * -20C to 85C absolute operating temperature * Lead-free package * Encoding resolution options: 75, 150 and 180 (lines/inch) or 2.95, 5.91, 7.09 (lines/mm) * PCB height profile options: 1.0 mm PCB thickness 1.5 mm PCB thickness Note: All specifications are subject to change without prior notification. Block Diagram of AEDR-8000 Encoder VLED R GND VCC CH A CH B SIGNAL PROCESSING CIRCUITRY CODEWHEEL or CODESTRIP Definitions State Width (S): The number of electrical degrees between a transition in Channel A and the neighboring transition in Channel B. There are 4 states per cycle, each nominally 90 e. State Width Error (DS): The deviation of state width, in electrical degrees, from its ideal value of 90 e. Phase (f): The number of electrical degrees between the center of high state of Channel A and the center of high state of Channel B. Nominally 90 e. Phase Error (Df): The deviation of phase, in electrical degrees, from its ideal value of 90 e. Pulse Width (P): The duration of high state of the output, in electrical degrees, within one cycle. Nominally 180 e or half a cycle. Pulse Width Error (DP): The deviation of pulse width, in electrical degrees, from its ideal value of 180 e. Count (N): The number of window and bar pairs per revolution (CPR) of codewheel. For linear codestrip, defined as the number of window and bar pairs per unit length (lines per inch [LPI] or lines per mm [LPmm]). One Cycle (C): 360 electrical degrees ( e). Equivalent to one window and bar pair. One Shaft Rotation: 360 mechanical degrees. Also equivalent to N counts (codewheel only). GND Theory of Operation The AEDR 8000 Encoder series combines an emitter and a detector in a single surface mount leadless package. When used with a codewheel or linear codestrip, the encoder translates rotary or linear motion into digital outputs. As seen in the block diagram, the AEDR-8000 Encoder series consists of three major components: a light emitting diode (LED) light source, a detector IC consisting photodiodes, and lens to focus light beam from the emitter as well as light falling on the detector. The operation of the encoder is based on the principle of optics where the detector photodiodes sense the absence and presence of light. In this case, the rotary/ linear motion of an object being monitored is converted to equivalent light pattern via the use of codewheel/codestrip. As shown in the above diagram, the reflective area (window) of the codewheel (or codestrip) reflects light back to the photodetector IC, whereas no light is reflected by the non-reflective area (bar). An alternating light and dark pattern, corresponding to the window and bar, falls on the photodiodes as the codewheel rotates. The moving light pattern is exploited by the detector circuitry to produce digital outputs representing the rotation of the codewheel. When the codewheel is coupled to a motor, the encoder outputs are then a direct representation of the motor rotation. The same concept applies to the use of a codestrip to detect linear motion. 2 Line Density: The number of window and bar pairs per unit length, expressed in either lines per inch (LPI) or lines per mm (LPmm). Optical Radius (Rop): The distance between the codewheel center and the centerline between the two domes of the encoder. Gap (G): The distance from the surface of the encoder to the surface of codewheel or codestrip. Specular Reflectance (Rf): The amount of incident light reflected by a surface. Quantified in terms of the percentage of incident light. A spectrometer can be used to measure specular reflectance of a surface (contact factory for more information). Radial and Tangential Misalignment Error (ER, ET): For rotary motion, mechanical displacement in the radial and tangential directions relative to the nominal alignment. Angular Misalignment Error (EA): Angular displacement of the encoder relative to the tangential line. Output Waveform C P ALL FOUR STATES (S1 to S4) ARE MAINTAINED. CH. A AMPLITUDE S1 S2 S3 S4 f CH. B CODEWHEEL ROTATION OR LINEAR MOVEMENT RADIAL (ER) ANGULAR (EA) TANGENTIAL (ET) AEDR-8000 AEDR-8000 SHAFT SHAFT CODEWHEEL CODEWHEEL 3 Absolute Maximum Ratings Storage Temperature, TS Operating Temperature, TA Supply Voltage, VCC Output Voltage, VO Output Current per Channel, IOUT ESD -40C to 85C -20C to 85C -0.5 V to 7 V -0.5 V to VCC -1.0 mA to 8 mA Human Body Model JESD22-A114-A Class 2 Machine Model JESD22-A115-A Class B Notes: 1. Exposure to extreme light intensity (such as from flashbulbs or spotlights) may cause permanent damage to the device. 2. CAUTION: It is advised that normal static precautions should be taken when handling the encoder in order to avoid damage and/or degradation induced by ESD. 3. Proper operation of the encoder cannot be guaranteed if the maximum ratings are exceeded. Recommended Operating Conditions Parameter Sym. Temperature TA Supply Voltage VCC LED Current ILED Load Capacitance CL Count Frequency f Radial Misalignment ER Tangential Misalignment Angular Misalignment Codewheel/Strip Tilt Codewheel/Strip Gap ET EA CT G Min. 0 4.5 13 Typ. 25 5.0 15 1.0 (0.04) 0 0 2.0 (0.08) Max. 85 5.5 18 100 30 0.38 (0.015) 0.38 ( 0.015) 1.5 1 2.5 (0.10) Units C V mA pF kHz mm (in.) mm (in.) deg. deg. mm (in.) Notes Ripple < 100 mVp-p See note 1 2.7 k Pull-Up See note 2 Note: 1. Refer to "LED Current Limiting Resistor" on page 5. 2. Count frequency = velocity (RPM) x N/60. Encoding Characteristics Encoding characteristics over the recommended operating condition and mounting conditions. Parameter Symbol Typical Maximum Unit Pulse Width Error DP 15 55 e Pulse Width Error (Ch. A, Ch. B) DP 15, 25 55, 75 e 16 75 16 75 Phase Error Df 12 60 e 10 60 10 60 Notes AEDR-8010-K AEDR-8000-K AEDR-8100-P AEDR-8100-Q AEDR-8000-K AEDR-8100-P AEDR-8100-Q Note: Typical values represent the encoder performance at typical mounting alignment, whereas the maximum values represent the encoder performance across the range of recommended mounting tolerance. 4 Electrical Characteristics Characteristics over recommended operating conditions at 25C. Parameter Symbol Min. Typ. Detector Supply Current Icc 2.2 High Level Output Voltage VOH 2.4 Low Level Output Voltage VOL Rise Time tr 500 Fall Time tf 100 Max. 5.0 0.4 Unit mA V V ns ns Notes IOH = -0.2 mA IOL = 8.0 mA CL = 25 pF RL = 2.7 k Recommended Codewheel and Codestrip Characteristics Wb Lw Ww Rop Lw Ww Wb Parameter Window/Bar Ratio Window/Bar Length Specular Reflectance Symbol Ww/Wb LW Rf Optical Radius Rop Min. Max. 0.9 1.1 1.80 (0.071) 2.31 (0.091) 60 85 - 10 2.95 (75) 5.91 (150) 7.09 (180) 11 - Unit mm (inches) Notes mm Reflective area. See note 1. Nonreflective area AEDR-80X0-K AEDR-8100-P AEDR-8100-Q Recommended value Notes: 1. Measurements from TMA Scan meter. Contact factory for more information. 2. Contact factory for more information on compatibility of codewheel/strip. LED Current Limiting Resistor A resistor to limit current to the LED is required. The recommended value is 220 (10 %) and the resistor should be placed in series between the 5 V supply and pin 3 of the device (Vled). This will result in an LED current of approximately 15 mA. Moisture Sensitive Level The AEDR-8000 series is specified to moisture sensitive level (MSL) 3. 5 Package Outline Drawing 6.2 4.4 TOP VIEW 1.02 0.4 VLED 0.62 NC 1.28 1.54 NC GND 0.64 0.84 1.62 CH B CH A GND VCC 0.4 BOTTOM VIEW 3.2 1.5 2.7 1.0 SIDE VIEW (LOW RESOLUTION) SIDE VIEW (HIGH RESOLUTION) ALL DIMENSIONS ARE IN MILLIMETERS TOLERANCE X.XX 1.5 mm 6 Encoder Orientation The AEDR-8000 series is designed such that both the LED and detector IC should be placed parallel to the window/bar orientation, as shown. As such, the encoder is tolerant against radial play of 0.38 mm. The emitter side should be placed closer to the rotating shaft. CODEWHEEL CODESTRIP DIRECTION OF RADIAL PLAY DIRECTION OF RADIAL PLAY Mounting Consideration CODEWHEEL/CODESTRIP GAP ROP 11.00 mm (0.433 IN) < ROP < Direction of Codewheel Rotation With the emitter side of the encoder placed closer to the codewheel centre, Channel A leads Channel B when the codewheel rotates anti-clockwise and vice versa. ANTI-CLOCKWISE EMITTER CH. A LEADS CH. B CH. B LEADS CH. A EMITTER CLOCKWISE Viewed from Top 7 Recommended Lead-Free Reflow Soldering Temperature Profile 300 250 TEMPERATURE (C) 10 - 20 SEC. 255C 250C 217C 200 150 120 SEC. MAX. 60 - 150 SEC. 125C 100 50 40C 0 1 22 45 66 87 108 129 150 171 192 213 235 256 278 299 320 341 363 384 TIME (SEC.) HEAT UP SOLDER PASTE DRY SOLDER REFLOW COOL DOWN Preheat Temperature 40C to 125C = 120 sec. max. Temperature Maintain Above 217C = 60 - 150 sec. Peak Temperature = 255 5C Time Above 250C = 10 - 20 sec. Note: Due to treatment of high temperature, AEDR-8000 transparent compound is expected to turn yellow after IR reflow. Resolution Indicator Since the encoder is too small to imprint resolution marking on its package, color-coding the package is employed to differentiate resolutions. The details are: LPI Color 75 Clear 150 Red 180 Amber 8 Ordering Information AEDR-8 0 Option PCB Thickness 0 - 1.5 mm (Low Resolution) 1 - 1.0 mm (High Resolution) Number of Channels 1 - One Channel 0 - Two Channels Packaging 1 - Tape and Reel Lines per Inch K - 75 LPI P - 150 LPI Q - 180 LPI Shipping Units 0 - 1000 pcs 1 - 500 pcs 2 - 100 pcs Note: Encoders are packed in tape of quantity 1000 pcs or 500 pcs or 100 pcs. Available Options K- 75 LPI * * Resolution P- Q- 150 LPI 180 LPI Shipping Units 0- 1- 2- 1000 pcs 500 pcs 100 pcs * * * * * * * * * Encoder AEDR-8000 AEDR-8010 AEDR-8100 AEDR-8100 * * 9 For product information and a complete list of distributors, please go to our website: www.avagotech.com Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies Limited in the United States and other countries. Data subject to change. Copyright (c) 2006 Avago Technologies Pte. All rights reserved. 5989-3067EN July 2, 2006 |
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