AEDR-8310-1K0 datasheet(2/10 Pages) HP

Part #	AEDR-8310-1K0

Description	Agilent AEDR-8300 Series Encoders Reflective Surface Mount Optical Encoder

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Manufacturer	HP [Agilent(Hewlett-Packard)]

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Theory of Operation

The AEDR-8300 series combines

an emitter and a detector in a

single surface mount leadless

package. When used with a

codewheel or linear codestrip,

the encoder translates rotary or

linear motion into digital outputs.

As seen in the block diagram, the

AEDR-8300 consists of three

major components: a light emit-

ting diode (LED) light source, a

detector IC consisting photo-

diodes and lens to focus light

beam from the emitter as well as

light falling on the detector.

The operation of the encoder is

based on the principle of optics

where the detector photodiodes

sense the absence and presence

of light. In this case, the rotary/

linear motion of an object being

monitored is converted to

equivalent light pattern via the

use of codewheel/codestrip. As

shown in the above diagram, the

reflective area (window) of the

codewheel (or codestrip) reflects

light back to the photodetector

IC, whereas no light is reflected

by the non-reflective area (bar).

An alternating light and dark

patterns corresponding to the

window and bar fall on the

photodiodes as the codewheel

rotates. The moving light pattern

is exploited by the detector

circuitry to produce digital

outputs representing the rotation

of the codewheel. When the

codewheel is coupled to a motor,

the encoder outputs is then a

direct representation of the

motor rotation. The same con-

cept applies to the use of a

codestrip to detect linear motion.

Definitions

State Width (S)

: The number of

electrical degrees between a

transition in Channel A and the

neighboring transition in Chan-

nel B. There are 4 states per

cycle, each nominally 90oe.

State Width Error (

∆S): The

deviation of state width, in

electrical degree, from its ideal

value of 90oe.

Phase (

φ): The number of electri-

cal degrees between the center of

high state of Channel A and the

center of high state of Channel B.

Nominally 90oe.

Phase Error (

∆φ): The deviation

of phase, in electrical degree,

from its ideal value of 90oe.

Pulse Width (P)

: The duration of

high state of the output, in

electrical degree, within one

cycle. Nominally 180oe or half a

cycle.

Pulse Width Error (

∆P): The

deviation of pulse width, in

electrical degree, from its ideal

value of 180oe.

Count (N)

: The number of

window and bar pair per revolu-

tion (CPR) of codewheel. For

linear codestrip, defined as the

number of window and bar pair

per unit length (lines per inch

[LPI] or lines per mm [LPmm]).

One Cycle (C)

: 360 electrical

degrees (oe). Equivalent to one

window and bar pair.

One Shaft Rotation

: 360 me-

chanical degrees. Also equivalent

to N counts (codewheel only).

Line Density

: The number of

window and bar pair per unit

length, expressed in either lines

per inch (LPI) or lines per mm

(LPmm).

Optical radius (Rop)

: The

distance between the codewheel

center and the centerline be-

tween the two domes of the

encoder.

Figure 1. Block Diagram of AEDR-8300.

VLED

GND

VCC

CH A

CH B

GND

SIGNAL

PROCESSING

CIRCUITRY

R

CODEWHEEL

OR

CODESTRIP

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AEDR-8310-1K0 Datasheet(PDF) 2 Page - Agilent(Hewlett-Packard)

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