HEDS-974 HP [Agilent(Hewlett-Packard)], HEDS-974 Datasheet

HEDS-974

Manufacturer Part Number

HEDS-974

Description

Agilent HEDS-974x Series for 180, 300, 360 LPI Small Optical Encoder Modules

Manufacturer

HP [Agilent(Hewlett-Packard)]

Datasheet

1.HEDS-974.pdf (6 pages)

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Description

The HEDS-974x series is a high

performance, low cost, optical

incremental encoder module. When

operated in conjunction with code-

strip, this module detects linear

position. The module consists of a

lensed LED source and a detector

IC enclosed in a small C-shaped

plastic package. Due to a highly

collimated light source and a

unique photodetector array, the

module is extremely tolerant to

mounting misalignment.

The two-channel digital outputs and 5

V supply input are accessed through

four solder-plated leads located on

2.54 mm (0.1 inch) centers.

Applications

The HEDS-974x provides sophisti-

cated motion detection at a low

cost, making close-loop control

very cost-competitive! Typical

applications include printers,

plotters, copiers, and office

automation equipment.

Note: Agilent Technologies

encoders are not recommended for

use in safety critical applications.

Eg. ABS braking systems, power

steering, life support systems and

critical care medical equipment.

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

Agilent HEDS-974x Series

for 180, 300, 360 LPI Small Optical

Encoder Modules

Data Sheet

Please contact sales

representative if more

clarification is needed.

Theory of Operation

The HEDS-974x 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 digital outputs.

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 codestrip moves between the

emitter and detector, causing the

light beam to be interrupted by the

pattern of spaces and bars on the

codestrip. The photodiodes which

detect these interruptions are

arranged in a pattern that corre-

sponds to the count density of the

Features

• Small size

• Multiple mounting options

• Wide resolution range

• Linear options available

• No signal adjustment required

• Insensitive to radial and axial play

• –40 C to +85 C operating

• High resolution version of the

• Two-channel quadrature output

• TTL or 5.0 V CMOS compatible

• Single 5 V supply

• Wave solderable

• Integrated 2.5 K pullup on outputs

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 compara-

tors 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).

temperature

HEDS-970x

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HEDS-974 Summary of contents

Page 1

... Description The HEDS-974x series is a high performance, low cost, optical incremental encoder module. When operated in conjunction with code- strip, this module detects linear position. The module consists of a lensed LED source and a detector IC enclosed in a small C-shaped plastic package. Due to a highly ...

Page 2

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 (LPI) of the codestrip. 1 Shaft Rotation = 360 mechanical degrees = N cycles ...

Page 3

Recommended Operating Conditions Parameter Symbol Temperature T Supply Voltage V CC Load Capacitance C L Pullup Resistor R L Count Frequency Angular Misalignment E A Electrical Characteristics over Recommended Operating Range, Typical at T Parameter Symbol Supply Current I High ...

Page 4

Recommended Codewheel and Codestrip Characteristics Parameter Window/Bar Ratio Center of Post to Inside Edge of Window Center of Post to Outside Edge of Window Center of Post to Inside Edge of Codestrip Mounting Considerations 4.44 0.13 0.175 0.005 IMAGE SIDE ...

Page 5

... Ordering Information HEDS-974 Option Resolution Options Lead Bend Q – 180 LPI, linear 0 – Straight Leads 2 – 300 LPI, linear 1 – Bend Leads 1 – 360 LPI, linear 50 51 HEDS-9740 HEDS-9741 10.8 ± 0.7 R 1.4 3.0 R 2.6 OPTION CODE 1.4 5.0 4.2 3.9 0.8 1.70 ± 0.22 3.90 ± 0.15 1.8 Mounting Options 50 – Standard ...

Page 6

For product information and a complete list of distributors, please go to our web site. For technical assistance call: Americas/Canada: +1 (800) 235-0312 or (408) 654-8675 Europe: +49 (0) 6441 92460 China: 10800 650 0017 Hong Kong: (+65) 6271 ...

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