AEDT-9140-F00

AEDT-9140-F00 Datasheet


AEDT-9140 Series High Temperature 115qC Three Channel Optical Incremental Encoder Modules 100 CPR to 1000 CPR

Part Datasheet
AEDT-9140-F00 AEDT-9140-F00 AEDT-9140-F00 (pdf)
Related Parts Information
AEDT-9140-A00 AEDT-9140-A00 AEDT-9140-A00
AEDT-9140-H00 AEDT-9140-H00 AEDT-9140-H00
AEDT-9140-I00 AEDT-9140-I00 AEDT-9140-I00
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AEDT-9140 Series High Temperature 115qC Three Channel Optical Incremental Encoder Modules 100 CPR to 1000 CPR

Data Sheet

The AEDT-9140 series are three channel optical incremental encoder modules. When used with a codewheel, these low cost modules detect rotary position. Each module consists of a lensed LED source and a detector IC enclosed in a small plastic package. Due to a highly collimated light source and a unique photodetector array, these modules are extremely tolerant to mounting misalignment.

The AEDT-9140 has two channel quadrature outputs plus a third channel index output. This index output is a 90 electrical degree high true index pulse which is generated once for each full rotation of the codewheel.

The AEDT-9140 optical encoder is designed for use with a codewheel which has an optical radius of mm inch for 100 CPR to 1000 CPR and mm inch for 1000 CPR.

The quadrature signals and the index pulse are accessed through mm square pins located on mm pitch centers.
x Two channel quadrature output with index pulse x Resolution from 100 CPR to 1000 CPR Cycles Per

Typical applications include:
x Printers x Plotters x Tape drives x Machine tools x Industrial and factory automation equipment.

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.

Theory of Operation

The AEDT-9140 is an emitter/detector module. Coupled with a codewheel, these modules translates rotary motion of a shaft into a three-channel digital output.

As seen in Figure 1, the modules contain a single Light Emitting Diode LED as its light source. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED. Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photodetectors and the signal processing circuitry necessary to produce the digital waveforms.

The codewheel rotates between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel.

The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and design of the code-wheel. These detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors.

The photodiode outputs are then fed through the signal processing circuitry resulting in A, A-bar, B, B-bar, I and Ibar. Comparators receive these signals and produce the output for channels A and B. Due to this integrated phasing technique, the digital output of channel A is in quadrature with that of channel B 90 degrees out of phase .

Note Refer to Figure 2

One Cycle C 360 electrical degrees qe .

One Shaft Rotation 360 mechanical degrees, N cycles.

Pulse Width S The number of electrical degrees that an output is high during 1 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°e.

Phase Error 'I The deviation of the phase from its ideal value of 90°e.

Direction of Rotation When the codewheel rotates in the clockwise direction viewing from top of the module direction from V to G , channel A will lead channel B. If the codewheel rotates in the opposite direction, channel B will lead channel A.

Optical Radius Rop The distance from the codewheel’s center of rotation to the optical center O.C of the encoder module.

Index Pulse Width Po The number of electrical degrees that an index is high during one full shaft rotation. This value is nominally 90qe or 1/4 cycle.

Block Diagram

RESISTOR

LENS

EMITTER SECTION Figure

PHOTO DIODES

COMPARATORS

VCC CH. A

CODE WHEEL

CH. B

SIGNAL PROCESSING CIRCUITRY DETECTOR SECTION

CH. I

INDEX PROCESSING CIRCUITRY

Output Waveforms

Figure 3
Ordering Information

AEDT-9140 Option

Resolution Options C - 100 CPR E - 200 CPR F - 256 CPR G - 360 CPR H - 400 CPR A - 500 CPR I - 512 CPR B - 1000 CPR

Codewheels Optical Radius 00 - mm 0B - mm

For product information and a complete list of distributors, please go to our web site:

Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries. Data subject to change. Copyright 2005-2009 Avago Technologies. All rights reserved. AV02-1101EN - November 10, 2009
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Datasheet ID: AEDT-9140-F00 520030