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AEDS-965X
Small Optical Encoder Modules 150 and 180 LPI Digital Output
Data Sheet
Description
The AEDS-965X is a very small, low package height and high performance incremental encoder module. It can operate at supply voltage, Vcc, 3.3/5V and the output voltage, Voh, will follow the Vcc voltage level. When operated in conjunction with a codestrip, this module detects linear position. The encoder consists of lensed LED source and a detector IC enclosed in a small C-shaped plastic package. Due to the brighter LED, coupled with a photodetector array, which is less sensitive to light, the encoder is highly tolerant to aerosol environment. This module is extremely receptive to mounting misalignment. The two channel digital outputs and Vcc, supply voltage input, are accessed through four solder plated leads located on 2.00mm (0.1 inch) centers. The supply input of LED, rated at 16mA is accessed through two leads located at 2.54mm. It is designed for use with a linear codestrip. Other options are available. Please contact the factory for more information.
Features
* Small Size * Built-in guide bumps for codewheel and codestrip * Low Package Height * Insensitive to Radial, Tangential and Axial Play * 0C to +70C recommended operating temperature * Wide Resolution Range * Two Channel Quadrature Output * TTL 3.3V or 5.0V CMOS compatible * For Linear and Rotary Application * Wave solderable * RoHS Compliant * Aerosol Tolerant
Applications
* Printers * Copiers/Fax * Plotters * Office Automation Equipments
Theory of Operation
The AEDS-965X is a C-shaped emitter/detector module. Coupled with a codewheel, it translates rotary motion into a two-channel digital output; coupled with a codestrip, it translates linear motion into a two-channel digital output. As seen in the Figure 1, the module contains a single Light Emitting Diode (LED) as its light source. The light is collimated into parallel beam by means of a single lens located directly over the LED. Opposite the emitter are the integrated detector circuits. This IC consists of multiple sets of photodetectors and a signal processing circuitry necessary to produce the digital waveforms. The codewheel/codestrip moves between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codehweel/ codestrip. The photodiodes that detect these interruptions are arranged in a pattern that corresponds to the radius and count density of the codewheel/0codestrip. These detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pairs of detectors. The photodiode outputs are fed through the signal processing circuitry. Two comparators receive these signals and produce the final outputs for Channels A and B. Due to this integrated phasing technique the output of channel A is in quadrature with Channel B (90 degrees out of phase).
Definitions
Note: Refer to Figure 1 for the output waveform Count (N): The number of bar and window pairs or counts per revolution (CPR) of the codewheel. Or the number of lines per inch of the codestrip (LPI) 1 shaft Rotation = 360 degrees = N cycles 1 cycle (c) = 360 electrical degree, equivalent to 1 bar and window pair. Pulse Width (P): The number of electrical degree that an output is high during one cycle. This value is nominally 180 e or 1/2 cycle. Pulse Width Error (P): The deviation, in electrical degrees, of the pulse width from its ideal value of 180 e. 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 90 e. State Width Error (S): The deviation, in electrical degrees of each state width from its ideal value of 90 Phase (): The number of electrical degrees between the center of the high state of channel A and the center of the high state of channel B. Phase Error ( the deviation of the phase from its ): ideal value of 90e. Direction of Rotation: When the codewheel rotates in the counter clockwise direction (as viewed from the encoder end of the motor), channel A will lead channel B. If the codewheel rotates in the clockwise direction, channel B will lead channel A. Optical Radius (R op ): The distance from the codewheel's center of the rotation to the optical center (O.C) of the encoder modules. Angular Misalignment Error (E A ): Angular misalignment of the sensor in relation to the tangential direction. This applies for both rotary and linear motion. Mounting Position (RM): Distance from Motor Shaft center of rotation to center of Alignment Tab receiving hole.
Aerosol Tolerant
The AEDS-965x series uses the Transmissive Optical Technology with specially designed photodetector IC to reduce and compensate the errors due to ink mists contaminations. Coupled with a brighter LED, for better penetration through ink mists deposits, this enables the encoder to continue operating normally in ink mists environment.
2
AEDS-965x Series Block Diagram
Figure 1.
AEDS-965x Timing Diagram
Figure 1.
3
Absolute Maximum Ratings
Parameter Storage Temperature Operating Temperature Supply Voltage (Detector) Output Voltage Output current per channel Soldering Temperature DC Forward Reverse Voltage Symbol TS TA VCC Vo Io TSOL ILED VR Min. -40 0 -0.5 -0.5 -1.5 Max. 85 70 7 Vcc 10 260 40 5 Units C C Volts V mA C mA V t 7 sec VF < 3.0V IR = 100A Notes
Subjecting the part to stresses beyond those listed under this section may cause permanent damage to the device. These are stress ratings only and do not imply that the devices function beyond these ratings. Exposure to the extremes of these conditions for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter Temperature Supply Voltage (Detector) Load Capacitance Pullup Resistor Count Frequency Angular Misalignment Mounting Position DC Forward Current (LED) @ Vcc = 3.3 V Symbol Min. TA VCC CL Rpull Cf EA RM ILED 16 -3.0 0.0 ROP - 2.4 (Rop-0.095") 20 30 none 60 +3.0 0 3.0 Typ. 25 3.3 or 5.0 Max. 70 5.2 100 Units C Volts pF k kHz Deg. mm (inch) mA Recommended no pullup. Velocity (rpm) x N/60 Mounting consideration * Refer to mounting consideration Recommended 33 (10%) series resistor between 3.3V supply and Vled. Ripple < 100mVpp Notes
Electrical Characteristics
Electrical Characteristics over Recommend Operating Range, typical at 25C
Parameter Supply Current (Detector) High Level Output Voltage Low Level Output Voltage Rise Time Fall Time LED Forward Voltage
Symbol Min. ICC VOH VOL tr tf VF 1.5 2.4
Typ.@ 3.3V 3.0 3.3 50 50
Max. 5 5.2 0.4
Units mA V V ns ns
Notes Typ. IOH = -1.2 mA @ 3.3 V Typ. IOL = 2mA @ 3.3V CL = 25 pF Typical IF = 20mA
1.3 (turn on) 2.6
3.0
V
Note: Refer to Figure 2 for output waveform on tr and tf
4
Encoding Characteristics
Encoding Characteristics over the Recommended Operating Conditions and Mounting Conditions. These characteristics do not include codewheel/codestrip contribution. 1. The typical values are average over the full rotation of the codewheel at Nominal Mouting Position and Typical Operating Conditions. 2. For a codestrip, the Typical Values are obtained at zero angular displacement and Typical Operating Conditions. 3. Maximums are the worst case values predicted over the full range of Recommended Mounting Tolerances and Operating Conditions, with consideration to population shift.
Parameter
Pulse Width Error Logic State Width Error Phase Error
Symbol Typ.
P S 7 5 2
Max. Units
40 40 20 e e e
Mounting Configuration
Note: These dimension includes shaft end play and codewheel warp. All dimensions for mounting in the module and codewheel/codestrip should be measured with respect to the two mounting post shown above.
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Mounting Configuration - Table
Error Eg Gap Rop (Option P)=11.00mm Rop (Option Q)=23.36mm 0.15 Unit mm Notes Recommend CW to put closer to the detector side (upper side), in order to give enough margin for encoder operation.
Er Et Ea
Radial Tangential Angular
0.13 0.13 3
mm mm Deg.
Package Dimension
AEDS-9650-X10 (Straight Lead)
6
AEDS-9651-X10 (Bent Lead)
7
Recommended Wave Solder Profile
Pb-free Wave Soldering Profile - Std-Profile 2
7 sec Max 260 C
Temperature (C)
A
B
C 120C/120 sec Max Time (s) Reflow Cool Down
Parameter A B C D Solder Pot Temperature Preheat Zone Temperature Dip in Time Solder Pot Zone (Encoder Lead)
Min. NA 85 5 200
Max. 260 120 7 260
Nominal values 250 - 260 100 - 120 5 NA
Units C C sec C
Note: - Nominal values are evaluated profiles for optimum performance. - Min/Max are critical limits to ensure encoders in good condition.
Ordering Information
Bracket Option 10
AEDS-965
Option
Lead Configuration 0 - Straight Leads 1 - Bent Leads
Resolution Option P - 150 LPI Q - 180 LPI
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. Obsoletes AV01-0285EN AV01-0506EN - September 29, 2006

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