HEDS-9701-C51 Datasheet HEDS-9701-C51 | P1-P3

Features

x Small Size

x Low Cost

x Multiple Mounting Options

x Wide Resolution Range

x Linear and Rotary Options Available

x No Signal Adjustment Required

x Insensitive to Radial and Axial Play

x -40°C to +85°C Operating Temperature

x Two Channel Quadrature Output

x TTL Compatible

x Single 5V Supply

x Wave Solderable

Mounting Option #50 - Standard (Baseplane Mounting) Contact Factory for Detailed Package Dimensions

ESD WARNING; NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.

HEDS-970x, HEDS-972x Series

Digital Output Small Optical Encoder Modules

Data Sheet

Package Dimensions

Description

The HEDS-9700 series is a high performance, low cost,

optical incremental encoder module. When operated

in conjunction with either a codewheel or codestrip,

this module detects rotary or linear position. The

module consists of a lensed LED source and a detector

IC enclosed in a small C-shaped plastic pack age. Due

to a highly collimated light source and a unique photo-

detector array, the module is extremely tolerant to

mounting misalignment.

The two channel digital outputs and 5V supply input are

accessed through four solder-plated leads located on

2.54 mm (0.1 inch) centers.

The standard HEDS-9700 is designed for use with an 11

mm optical radius codewheel, or linear codestrip. Other

options are available. Please contact factory for more in-

formation.

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 code wheel/

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

CHANNEL A

CHANNEL B

Pulse Width (P): The number of electrical degrees that

an output is high during one cycle. This value is nomi-

nally 180°e or 1/2 cycle.

Pulse Width Error ('P): The deviation, in electrical de-

grees, of the pulse width from its ideal value of 180°e.

State Width (S): The number of electrical degrees be-

tween 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 de-

grees, of each state width from its ideal value of 90°e.

Phase (I): 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. This value is nominally 90°e

for quadrature output.

Phase Error ('I): The deviation of the phase from its

ideal value of 90°e.

Direction of Rotation: When the codewheel rotates

counterclock wise, as viewed looking down on the mod-

ule (so the marking is visible), channel A will lead chan-

nel 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.

Absolute Maximum Ratings

Parameter Symbol Min. Max. Units Notes

Storage Temperature T

-40 85 °C See Note

Operating Temperature T

-40 85 °C See Note

Supply Voltage V

-0.5 7 V

Output Voltage V

-0.5 V

Output Current per I

-1.0 5 mA

Channel

Soldering Temperature 260 °C t ≤5 sec.

Output Waveforms

Deﬁnitions

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

mechanical

degrees

= N cycles

1 cycle (c) = 360 electrical

degrees (°e)

= 1 bar and

window pair

ROTATION

CHANNEL A

CHANNEL B

AMPLITUDE

S1 S4

P1-P3 P4-P6 P7-P9 P10-P10

HEDS-9701-C51

Mfr. #:

Buy HEDS-9701-C51

Manufacturer:

Broadcom / Avago

Description:

Encoders 2 Channel 100CPR

Lifecycle:

New from this manufacturer.

Delivery:

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HEDS-9701-C51