HEDS-5120-H13 - Agilent / Hewlett-Packard

High Temperature 125°C Two

Channel Optical Incremental

Encoder Modules

Technical Data

HEDT-9000

HEDT-9100

Features

• High Performance

• High Resolution

• Low Cost

• Easy to Mount

• No Signal Adjustment

Required

• Insensitive to Radial and

Axial Play

• Small Size

• -40°C to 125°C Operating

Temperature

• Two Channel Quadrature

Output

• TTL Compatible

• Single 5 V Supply

Description

The HEDT-9000 and the HEDT-

9100 series are high

performance, low cost, optical

incremental encoder modules that

operate to 125°C. When used with

a codewheel, these modules

detect rotary position. The

modules consist 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 unique

photodetector array, these

modules are extremely tolerant to

mounting misalignment.

The two channel digital outputs

and the single 5 V supply input

are accessed through five 0.025

inch square pins located on 0.1

inch centers.

ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC

DISCHARGE.

Package Dimensions

26.67 (1.05)

HEDS-9X00

15.2

(0.60)

17.27

(0.680)

20.96

(0.825)

1.85 (0.073)

8.64 (0.340)

REF.

ALIGNING RECESS

2.44/2.41 DIA.

(0.096/0.095)

2.16 (0.085)

DEEP

1.02 ± 0.10

(0.040 ± 0.004)

5.1 (0.20)

X00

YYXX

OPTION CODE

0.63 (0.025)

SQR. TYP. 2.54 (0.100) TYP.

DATE CODE

1.0 (0.04)

3.73 ± 0.05

(0.147 ± 0.002)

2.67 (0.105) DIA.

MOUNTING THRU

HOLE 2 PLACES

2.44/2.41 X 2.79

(0.096/0.095 X 0.110)

2.16 (0.085) DEEP

OPTICAL CENTER

1.52 (0.060)

20.8

(0.82) 11.7

(0.46)

8.6 (0.34)

1.78 ± 0.10

(0.070 ± 0.004)

2.92 ± 0.10

(0.115 ± 0.004) 10.2

(0.400)

5.46 ± 0.10

(0.215 ± 0.004)

OPTICAL

CENTER LINE

2.54

(0.100)

2.21

(0.087)

5.8

(0.23)

6.35 (0.250) REF.

ALIGNING RECESS

2.44/2.41 X 2.79

(0.096/0.095 X 0.110)

2.16 (0.085) DEEP

4.11 (0.162)

ALIGNING RECESS

2.44/2.41 DIA.

(0.096/0.095)

2.16 (0.085) DEEP

OPTICAL

CENTER

45°

8.81

(0.347)

11.9

(0.47)

4.75 ± 0.10

(0.187 ± 0.004)

2.9

(0.11)

1.8

(0.07)

6.9 (0.27)

GND

5 CH. B

4 V

3 CH. A

2 N.C.

1 GND

SIDE A SIDE B

TYPICAL DIMENSIONS IN

MILLIMETERS AND (INCHES)

Standard resolutions for the

HEDT-9000 are 500 CPR and

1000 CPR for use with a HEDS-

6100 codewheel or equivalent.

For the HEDT-9100, standard

resolutions between 96 CPR and

512 CPR are available for use

with a HEDS-5120 codewheel or

equivalent.

Applications

The HEDT-9000 and 9100

provide sophisticated motion

detection at a low cost, at

temperatures to 125°C, making

them ideal for high volume

automotive applications.

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. Please

contact sales representative if

more clarification is needed.

Theory of Operation

The HEDT-9000 and 9100 are C-

shaped emitter/detector modules.

Coupled with a codewheel, they

translate the rotary motion of a

shaft into a two-channel digital

output.

As seen in the block diagram,

each 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 polyetherimide

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

product the digital waveforms.

The codewheel rotates between

the emitter and detector, causing

the light beam to be interrupted

Block Diagram

Output Waveforms

by the pattern of spaces and bars

on the codewheel. The

photodiodes which detect these

interruptions are arranged in a

pattern that corresponds to the

radius and design of the code-

wheel. 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 then fed through the

signal processing circuitry

resulting in A, A, B, and B. 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 that of channel B

(90 degrees out of phase).

Definitions

Count (N): The number of bar

and window pairs or counts per

revolution (CPR) of the

codewheel.

Absolute Maximum Ratings

Storage Temperature, TS..................................................................... -40°C to 125°C

Operating Temperature, TA................................................................ -40°C to 125°C

Supply Voltage, V

CC ...................................................................................... -0.5 V to 7 V

Output Voltage, V

O........................................................................................ -0.5 V to V

Output Current per Channel, Iout ................................................. -1.0 mA to 5 mA

Pulse Width (P): The number of

electrical degrees that an output

is high during 1 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 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.

Phase (

): 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 nominally

90°e for quadrature output.

Phase Error (

∆φ

): The deviation

of the phase from its ideal value

of 90°e.

Direction of Rotation: When the

codewheel rotates in the direction

of the arrow on top of the

module, channel A will lead

channel B. If the codewheel

rotates in the opposite direction,

channel B will lead channel A.

Optical Radius (Rop): The dis-

tance from the codewheel’s center

of rotation to the optical center

(O.C.) of the encoder module.

Recommended Operating Conditions

Parameter Symbol Min. Typ. Max. Units Notes

Temperature T -40 125 °C

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

Load Capacitance CL100 pF 3.3 kΩ pull-up resistor

Count Frequency f 100 kHz Velocity (rpm) x N

Note: The module performance is guaranteed to 100 kHz but can operate at higher frequencies.

Encoding Characteristics

Encoding Characteristics over Recommended Operating Range and Recommended Mounting Tolerances.

These Characteristics do not include codewheel/codestrip contributions.

Description Sym. Typ. Case 1 Max. Case 2 Max. Units Notes

Pulse Width Error ∆P 7 35 45 °e

Logic State Width Error ∆S 5 35 45 °e

Phase Error ∆φ 215 20 °e

Case 1: Module mounted on tolerance circle of ±0.13 mm (±0.005 in.).

Case 2: HEDT-9000 mounted on tolerances of ±0.50 mm (0.020").

HEDT-9100 mounted ontolerances of ±0.38 mm (0.015").

Electrical Characteristics

Electrical Characteristics over Recommended Operating Range, typical at 25°C.

Parameter Symbol Min. Typical Max. Units Notes

Supply Current ICC 17 40 mA

High Level Output Voltage VOH 2.4 Volts IOH = -40 µA max.

Low Level Output Voltage VOL 0.4 Volts IOL = 3.2 mA

Rise Time tr200 ns CL = 25 pF

Fall Time tf50 ns RL = 11 kΩ pull-up

Recommended Codewheel Characteristics

Figure 1. Codestrip Design.

Codewheel Options

Optical

HEDS CPR Radius

Series (N) Option mm (in.)

5120 96 K 11.00 (0.433)

5120 100 C 11.00 (0.433)

5120 192 D 11.00 (0.433)

5120 200 E 11.00 (0.433)

5120 256 F 11.00 (0.433)

5120 360 G 11.00 (0.433)

5120 400 H 11.00 (0.433)

5120 500 A 11.00 (0.433)

5120 512 I 11.00 (0.433)

6100 500 A 23.36 (0.920)

6100 1000 B 23.36 (0.920)

Parameter Symbol Minimum Maximum Units Notes

Window/Bar Ratio φw/φb0.7 1.4

Window Length L 1.8 (0.07) 2.3 (0.09) mm (inch)

Absolute Maximum RCROP + 1.9 (0.075) mm (inch) Includes eccentricity

Codewheel Radius errors

Mounting Considerations

Figure 5. HEDS-6100 Codewheel.

Figure 4. HEDS-5120 Codewheel.

Figure 2. Mounting Plane Side A. Figure 3. Mounting Plane Side B.

HEDT-9001 Option HEDS-6100 Option

0 0

Resolution

(Cycles/Rev)

A - 500

Ordering Information

Shaft Diameter

06 - 1/4 in. 09 - 1/2 in.

08 - 3/8 in. 10 - 5/8 in.

01 02 03 04 05 06 08 09 10 11 12 13 14

HEDS-6100 A * * *

01 02 03 04 05 06 08 09 10 11 12 13 14

HEDS-5120 A ****** ** *

C * * ****

E**

G** ** * *

H*****

K* *

ACDEGI

HEDT-9001 *

HEDT-9100 * * * * *

HEDT-9101 ******

HEDT-910 Option HEDS-5120 Option

Shaft Diameter

01 - 2 mm 11 - 4 mm

02 - 3 mm 14 - 5 mm

03 - 1/8 in. 12 - 6 mm

04 - 5/32 in. 13 - 8 mm

05 - 3/16 in.

06 - 1/4 in.

Resolution (Cycles/Rev)

C - 100 CPR

D - 192 CPR

E - 200 CPR

G - 360 CPR

A - 500 CPR

I - 512 CPR

0 0

Lead

0 - Straight Leads

1 - Bent Leads

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

(408) 654-8675

Europe: +49 (0) 6441 92460

China: 10800 650 0017

Hong Kong: (+65) 271 2451

India, Australia, New Zealand: (+65) 271 2394

Japan: (+81 3) 3335-8152(Domestic/Interna-

tional), or 0120-61-1280(Domestic Only)

Korea: (+65) 271 2194

Malaysia, Singapore: (+65) 271 2054

Taiwan: (+65) 271 2654

Data subject to change.

Obsoletes 5988-2577EN

February 11, 2002

5988-5280EN