HDSP-C3E3 datasheet(2/10 Pages) AVAGO

2 / 10 page

Applications

The HEDS-9700 provides sophisticated motion detection

at a low cost, making closed-loop control very cost-com-

petitive! Typical applications include printers, plotters,

copiers, and oﬃce automation equipment.

Note: Avago Technologies encoders are not recom-

mended 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 HEDS-9700 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 digital

output.

As seen in the block diagram, the module contains a

single Light Emitting Diode (LED) as its light source. The

light is collimated into a parallel beam by means of a

single 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/codestrip moves between the emitter

and detector, causing the light beam to be interrupted

by the pattern of spaces and bars on the codewheel/

codestrip. The photodiodes which detect these interrup-

tions are arranged in a pattern that corresponds to the

radius and count density of the codewheel/codestrip.

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 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 digital output of channel A is in

quadrature with channel B (90 degrees out of phase).

Block Diagram

RESISTOR

LENS

LED

COMPARATORS

PHOTO-

DIODES

SIGNAL

PROCESSING

CIRCUITRY

EMITTER SECTION

CODE

WHEEL

DETECTOR SECTION

GND

VCC

CHANNEL A

CHANNEL B

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