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AEDR-8300-1Wx Encoders
Reflective Surface Mount Optical Encoder
Data Sheet
Description
The AEDR-8300-1Wx is the smallest optical encoder employing reflective technology for motion control purposes. The encoder houses an LED light source and a photo-detecting circuitry in a single package. The AEDR-8300-1Wx offers two-channel quadrature digital outputs. Being TTL compatible, the outputs of the AEDR-8300-1Wx can be interfaced directly with most of the signal processing circuitries. Hence the encoder provides great design-in flexibility and easy integration into existing systems. The AEDR-8300-1Wx could yields encoding resolution at 212 lines per inch (LPI) which is 8.35 lines per mm. The AEDR-8300-1Wx provides motion sensing at a competitive cost, making it ideal for high volume applications. Its small size and surface mount package make it ideal for many consumer products, particularly where space and weigh are primary design constraint.
Features
* Reflective technology * Surface mount leadless package * Two channel quadrature outputs for direction sensing * TTL compatible output * Single 3.3V to 5V supply * -20C to 85C absolute operating temperature * Encoding resolution: 212 (lines/inch) or 8.35 (lines/mm)
Applications
Ideal for high volume applications: * Printers * Copiers * Card readers * Scanners * Cameras * Motor Solutions * Automated Wheel-chair * Vending Machines * Low Servo Systems * ATM Machines * Textile Machines * Industrial Sewing Machines * Consumer Product Applications
Theory of Operation
The AEDR-8300-1Wx 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-83001Wx 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.
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 90e. State Width Error (S): The deviation of state width, in electrical degree, from its ideal value of 90e. Phase (): The number of electrical degrees between the center of high state of Channel A and the center of high state of Channel B. Nominally 90e. Phase Error ( The deviation of phase, in electrical ): degree, from its ideal value of 90e.
CODEWHEEL or CODESTRIP
Block Diagram of AEDR-8300-1Wx
VLED R GND VCC CH A CH B SIGNAL PROCESSING CIRCUITRY
Pulse Width (P): The duration of high state of the output, in electrical degree, within one cycle. Nominally 180e or half a cycle. Pulse Width Error (P): The deviation of pulse width, in electrical degree, from its ideal value of 180e. Count (N): The number of window and bar pair per revolution (CPR) of codewheel. For linear codestrip, defined as the number of window and bar pair 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.
GND
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 patterns corresponding to the window and bar fall 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.
One Shaft Rotation: 360 mechanical degrees. Also equivalent to N counts (codewheel only). Line Density: The number of window and bar pair 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 surface of the encoder to the surface of codewheel or codestrip. 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 (E A ): Angular displacement of the encoder relative to the tangential line. 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).
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Output waveform
C P ALL FOUR STATES (S1 to S4) ARE MAINTAINED
CH. A
AMPLITUDE
S1
S2
S3
S4
CH. B
CODEWHEEL ROTATION OR LINEAR MOVEMENT
RADIAL (E R ) ANGULAR (EA ) TANGENTIAL (E T )
AEDR-8300-1Wx
AEDR-8300-1Wx
SHAFT
SHAFT
CODEWHEEL
CODEWHEEL
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.
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Recommended Operating Conditions
Parameter Temperature Supply Voltage LED Current Load Capacitance Count Frequency
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Symbol Minimum TA VCC ILED CL F ER 0.3 -20 3.0 13
Typical 25 3.3 / 5.0 15
Maximum 85 5.5 18 100 60 0.38 (0.015) 0.38 (0.015)
Units C V mA pF kHz mm (in.) mm (in.) deg. deg. mm (in.)
Notes Ripple < 100mVp-p See Note 1 2.7 k Pull-Up See Note 3
Radial Misalignment
Tangential Misalignment ET Angular Misalignment Codewheel/strip tilt Codewheel/strip Gap EA CT G 1.0 (0.04) 0 0 2.0 (0.08)
1.5 1 2.5 (0.10)
Notes: 1. LED Current Limiting Resistor: For Vcc = 5.0V, recommended series resistor = 220W (10 %) For Vcc = 3.3V, recommended series resistor = 110W ( 10 %) 2. Count frequency = velocity (rpm) x N / 60. 3. Data collected based on Avago production characterization.
Encoding Characteristics
Encoding characteristics over the recommended operating condition and mounting conditions.
Parameter Pulse Width Error (Ch.A, Ch.B) Phase Error Symbol P Typical 16 10 Maximum 75 60 Unit e e
Note: 1. 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.
Electrical Characteristics
Characteristics over recommended operating conditions at 25C.
Parameter Detector Supply Current High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Symbol ICC VOH VOL tr tf 500 100 2.4 0.4 Minimum Typical 4.8 3.9 Maximum 6.0 4.1 V V ns ns Unit mA Notes Vcc = 5V Vcc = 3.3V IOH = -0.2mA IOL = 8.0mA CL = 25pF RL = 2.7k
4
Recommended Codewheel and Codestrip Characteristics
Wb Lw Rop Lw
Ww
Ww Wb
Parameter Window/bar Ratio Window/bar Length Specular Reflectance
Symbol Ww/Wb LW Rf
Minimum 0.9 1.80 (0.071) 60 -
Maximum 1.1 2.31 (0.091) 85 10 lines/mm (lines/inch)
Unit mm (inches)
Notes
Reflective area. See note 1. Non reflective area
Line Density Optical radius
LPmm (LPI) Rop
8.35 (212) 11
mm
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. If 3.3V voltage supply is used, the corresponded resistance would be 110 ( 10 %).
Moisture Sensitive Level
The AEDR-8300-1Wx is specified to moisture sensitive level (MSL) 3.
5
Outline Drawing
PIN 1
Chamfer
PIN 6 PIN 6
PIN 1
Detector PIN 2 Emitter PIN 5
PIN 5
PIN 2
PIN 4 PIN 3 Top View PIN 4 Bottom View
PIN 3
Side View
Notes: 1. All dimensions in millimeter. 2. Tolerance X.XX 0.15mm. 3. For ease of reference, a chamfer is incorporated on the detector side (pin 6), as shown in the above diagram.
Encoder Pin Configuration
Encoder option AEDR-8300-1Wx Pin 1 Ch B Pin2 Gnd Pin3 VLED Pin4 Gnd Pin5 Ch A Pin6 Vcc
Encoder Orientation
The AEDR-8300-1Wx 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 0.38mm. The emitter side (pins 3 and 4) should be placed closer to the rotating shaft.
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Mounting Consideration
Codewheel/codestrip Gap
Rop 11.00 mm (0.433 IN) < Rop <
Direction of Codewheel Rotation
With the emitter side (pins 3 and 4) 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
Recommended Land Pattern for AEDR-8300-1Wx
0.72 0.94 Mounting Center
1.96
1.08
Note: The shaded areas are the leads for soldering.
Note: The shaded areas are not encoder pin-outs. They are electrically grounded and physically exposed. PCB layout with tracks running across these areas should be avoided.
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Recommended Lead-free Reflow Soldering Temperature Profile
300 250 TEMPERATURE (C) 200 150 125 C 100 50 40 C 0 1 22 45 66 87 108 129 150 171 192 213 235 256 278 299 320 341 363 384 10 - 20 SEC. 255 C 250 C 217 C 120 SEC. MAX. 60 - 150 SEC.
TIME (SEC.) HEAT UP SOLDER PASTE DRY SOLDER REFLOW COOL DOWN
Preheat Temperature 40 C to 125 C = 120 sec max Temperature maintain above 217 C = 60 - 150 sec Peak Temperature = 255 5C Time above 250 C = 10 - 20 sec
Note: Due to treatment of high temperature, AEDR-8300-1Wx compound may turn to 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.
Resolution (LPI) Color
212 Light Amber
Ordering Information
AEDR-8300 Option 1W
Shipping Units 0 - 1000 pcs 1 - 500 pcs 2 - 100 pcs
Note: Encoders are packed in tape of quantity 1000pcs, 500pcs or 100pcs.
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, Limited in the United States and other countries. Data subject to change. Copyright (c) 2006 Avago Technologies Pte. All rights reserved. AV01-0178EN - June 16, 2006

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