HEDS-9710 datasheet(2/8 Pages) HP

Part #	HEDS-9710

Description	200 lpi Analog Output Small Optical Encoder Modules

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Manufacturer	HP [Agilent(Hewlett-Packard)]

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The module contains a single

Light Emitting Diode (LED) as its

light source. The light is colli-

mated into a parallel beam by

means of a single lens located

directly over the LED. Opposite

the emitter is the integrated de-

tector circuit. This IC consists of

multiple sets of photodetectors

and the signal processing cir-

cuitry necessary to produce the

analog waveforms.

The codewheel/codestrip moves

between the emitter and detector,

causing the light beam to be in-

terrupted by the pattern of spaces

and bars on the codewheel/

codestrip. The photodiodes which

detect these interruptions are

arranged in a pattern that corre-

sponds 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, which produces the

final outputs for channels A and

B. Due to this integrated phasing

technique, the analog output of

channel A is in quadrature with

channel B (90 degrees out of

phase).

Package Dimensions

See HEDS-9700 datasheet for

package outline drawings.

Definitions

Count (N): The number of bar

and window pairs or Counts Per

Revolution (CPR) of the code-

wheel, or the number of Lines Per

Inch (LPI) of the codestrip.

1 Shaft Rotation = 360 mechanical

degrees

= N cycles

1 cycle (c) = 360 electrical

degrees (

°e)

= 1 bar and window pair

Pulse Width (P): The number of

electrical degrees 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 four 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 (

Φ): The number of elec-

trical degrees between the center

of the high state of channel A and

the center of the high state of

channel B. This value is nomi-

nally 90

°e for quadrature output.

Phase Error (

∆Φ): The devia-

tion of the phase from its ideal

value of 90

°e.

Direction of Rotation: When

the codewheel rotates counter-

clockwise, as viewed looking

down on the module (so the

marking is visible), 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.

Mounting Position (RM):

Distance from Motor Shaft center

of rotation to center of Alignment

Tab receiving hole.

Absolute Maximum Ratings

Parameter

Symbol

Min.

Max.

Units

Notes

Storage Temperature

TS

–40

85

°C

Operating Temperature

TA

15

45

°C

Supply Voltage

VCC

–0.5

7

V

Soldering Temperature

260

°Ct ≤ 5 sec.

Recommended Operating Conditions

Parameter

Symbol

Min.

Max.

Units

Notes

Temperature

T

15

45

Supply Voltage

VCC

4.8

5.2

V

Ripple < 100 mVp-p

Count Frequency

8

kHz

(Velocity (rpm) x N) 60

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