HEDS-8940 - Agilent / Hewlett-Packard

Agilent AEDA-3200-Txx Series

Ultra Miniature, High Resolution

Incremental Encoders

Data Sheet

Description

The AEDA-3200-T series (top

mounting type) are high

performance, cost effective,

three-channel optical incremen-

tal encoder modules.

AEDA-3200-T series emphasize

high reliability, high resolution

and easy assembly, using trans-

missive encoder technology to

sense rotary position. Outputs of

the AEDA-3200 encoders are two

channel quadrature outputs and

a third channel gated index

output. These encoder modules

can be easily mounted to

customer specific applications

with the specially designed Plug

and Play tool.

Features

• Two channel quadrature output

with index

• Quick and easy assembly using

Plug and Play tool

• Cost-effective

• Ultra miniature size (φ17 mm)

• Resolution options from 2500 to

10000 Cycles Per Revolution (CPR),

up to 40000 counts with 4X

decoding

• Integrated RS 422 differential

line driver

17.6

1.4

φ 17.0

Outline Drawing

Hub

odewheel

0.1

± 0.010

x5 – 1.27mm pitch pin

(

0.4mmx0.4mm) header

Detector PCB

Reticle

ens

mitter PCB

IGNAL

ROCESSING

IRCUITRY

LENS

CODEWHEEL

Vcc

h A

Ch B

ESISTOR

Output Waveforms

Theory of Operation

The AEDA-3200 translates rotary

motion of a shaft into a three

channel digital output. The

AEDA-3200 series has five key

parts: a single light emitting

diode (LED) light source, a

photodetector IC with a set of

uniquely configured photodiodes,

an interpolator IC, a line driver

IC and a pair of lenses.

This light is used to produce

internal signals A and A-, and B

and B-.

As part of the “push-pull” detec-

tor system, these signals are fed

through comparators and line

driver that are part of the signal

processing circuitry to produce

the final outputs for channels A.

The AEDA-3200 is available for

cycles per revolution (CPR) of

2500 to 10000. This translates to

a maximum resolution of 40000

counts after quadrature decode

(4X).

CODEWHEEL ROTATION (Clockwise)

S1 S2 S3 S4

0.5V

2.5 V

0.5 V

2.5 V

0.5 V

2.5 V

0.5 V

2.5 V

0.5 V

2.5 V

0.5 V

2.5 V

CH. A

CH. B

CH. I

CH. I-

CH. A-

CH. B-

MPLITUDE

Definitions

Count (N): N refers to the cycles

per revolution (CPR) of the

encoder output.

One Cycle (C): 360 electrical

degrees (°e).

One Shaft Rotation: 360

mechanical degrees, N cycles

(rotary motion only).

Phase (φ): The number of electri-

cal degrees between the center of

the high state on the channel A

and the center of the high state

of channel B. This value is

nominally 90°e.

Pulse Width (P): The number of

the electrical degrees that an

output is a high-level during one

cycle, nominally 180°e or 1/2 a

cycle.

Pulse Width Error (∆P): The

deviation in electrical degrees of

the pulse width from its ideal

value of 180°e.

Index Pulse Width (Po): The

number of electrical degrees that

an index is high during one full

shaft rotation. This value is

nominally 90°e or 1/4 cycle.

State Width (S): The number of

the electrical degrees between a

transition in the output of the

channel B. There are 4 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.

Recommended Operating Conditions

Parameter Symbol Min. Typical Max. Units Notes

Temperature TA-40 25 125 °C

Supply Voltage VCC 4.5 5.0 5.5 Volts Ripple <100 mVp-p

Frequency f 125 1000 kHz f = RPM x CPR

Direction of Motor Rotation

When the codewheel rotates in a

clockwise direction, channel A

will lead channel B (Figure 1

illustrates the definition of

clockwise direction of codewheel

rotation). When the codewheel

rotates in a counter-clockwise

direction, channel B will lead

channel A. Figure 1. Viewed from the PCB encoder end.

Absolute Maximum Ratings

Storage Temperature -40°C to 125°C

Operating Temperature -40°C to 125°C

Supply Voltage 4.5 V to 5.5 V

Output Voltage -0.5 V to Vcc

Output Current per Channel 20 mA

Frequency 1 MHz

Direction of

codewheel rotation

Maximum Frequency and RPM

CPR Maximum Frequency (kHz) Maximum RPM

2500 1000 112000

5000 1000 12000

6000 1000 10000

7200 1000 8300

7500 1000 8000

8000 1000 7500

10000 1000 6000

Note:

1. Maximum frequency will be lower due to limitation in maximum RPM.

Electrical Characteristics

Electrical characteristics over recommended operating conditions. Typical values at 25oC.

Parameter Symbol Min. Typical Max. Units

Supply Current ICC 55 80 mA

High level Output Voltage VOH 2.5 3.4 V

Low level Output Voltage VOL 0.3 0.5 V

Encoding Characteristics

Encoding characteristics over recommended operating conditions. Typical values at 25oC.

Parameter Symbol Typical Max. Units

Pulse Width Error ∆P5 85°e

State Width Error ∆S5 60°e

Phase Error ∆φ 1 40°e

Mechanical Characteristics

(Refer to page 2 for details.)

Parameter Dimension/Details Tolerance Units

Standard Shaft Diameters 2 mm diameter maximum * +0/-.01 (+0/-.0005) mm (in)

Mounting Screw Size: M2.5 x 0.45 mm

(Recommended Length 6 mm)

* Note:

1. Using a step shaft, maximum shaft diameter is 4 mm.

Codewheel

2. 000

ote: Tighter tolerance

ontrol will be better

Baseplate

φ2.00 t o φ4.00

φ7.00

Ma ximu m

Electrical Interface

Agilent recommends National

Semiconductor DS26C32AM

Quad Differential Line Receiver

or compatible as line receiver.

Unused pin should be grounded

for noise reduction.

Alignment Considerations

The Plug and Play tool is

intended to absorb normal

installation misalignment and

runouts. To achieve the optimum

performance, user should mini-

mize misalignment.

Complete instruction for

AEDA-3200 Plug and Play

installation can be found in the

AEDA-3200 application note.

AEDA-3200 Plug and Play tool

part number is HEDS-8940. Plug and Play tool.

Pin Assignments

Pin Signal Description

Pin 1 B+ Digital Output

Pin 2 B- Digital Output

Pin 3 Gnd Ground Pin

Pin 4 Gnd Ground Pin

Pin 5 A+ Digital Output

Pin 6 A- Digital Output

Pin 7 Vcc Input Voltage

Pin 8 Vcc Input Voltage

Pin 9 I+ Digital Output

Pin 10 I- Digital Output

Notes:

1. Both Pin 7 and Pin 8 must be connected to Vcc.

2. Either Pin 3 or Pin 4 must be connected to Gnd.

9 7 5 3 1

10 8 6 4 2

Mating Connector

AEDA-3200 requires a 5 x 2

(1.27 mm x 1.27 mm) female IDC

Connector. The cable used is

0.635 mm pitch flat ribbon cable.

Ch A+

Ch A-

Ch B+

Ch B-

Ch I+

Ch I-

Vcc

DS26C32AM

AEDA-32xx

www.agilent.com/semiconductors

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

(916) 788-6763

Europe: +49 (0) 6441 92460

China: 10800 650 0017

Hong Kong: (65) 6756 2394

India, Australia, New Zealand: (65) 6755 1939

Japan: (+81 3) 3335-8152(Domestic/International), or

0120-61-1280(Domestic Only)

Korea: (65) 6755 1989

Singapore, Malaysia, Vietnam, Thailand, Philippines,

Indonesia: (65) 6755 2044

Taiwan: (65) 6755 1843

Data subject to change.

December 7, 2004

5989-1389EN

Ordering Information

A E D A - 3 2 0 0 - T

Resolution Options (CPR) Counts After 4x Decoding

A J

B 1

B 7

B J

B K

B M

C 1

2,500

5,000

6,000

7,200

7,500

8,000

10,000

20,000

24,000

28,800

30,000

32,000

40,000