HEDR-8000 - Avago - Product.Network

6.2 ± 0.20

(0.244 ± 0.008)

1.270

(0.050)

1234

8765

TYP.

3.94 ± 0.13 *

(0.155 ± 0.005) 1.97

(0.078)REF.

REF.

0.38 ± 0.08

(0.016 ± 0.003)

3.18 ± 0.13

(0.125 ± 0.005)

5.08 ± 0.13 *

(0.200 ± 0.005)

1.40 ± 0.02

(0.055 ± 0.001)

1.52

(0.06) REF.

PIN ONE

INDICATOR

LOCATION

0.025

(0.001)MIN.

1.84

(0.072)REF.

0.700 R

(0.0276)REF. LEAD COPLANARITY ± 0.051

(0.002)

0.23 ± 0.03

(0.009 ± 0.001)

0.59

(0.023)MIN.

0.18 ± 0.08

(0.007 ± 0.003)

GND

LED

GND

NOTES:

*FLASH MAY ADD 0.38 (0.015) MAX.

AT PARTING LINE.

DIMENSIONS IN MILLIMETERS (INCHES).

FOR THE 1CHANNEL HEDR-8010, PIN 6

IS CONSIDERED NC.

ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID ST ATIC

DISCHARGE.

Outline Drawing

NOTE: HEDR-8000 series products are classified

as MSL Level 3.

Description

The HEDR-8000/8100 Series encoders use reflective

technology to sense rotary or linear position. This

sensor consists of an LED light source and a

photodetector IC in a single SO-8 surface mount

package. When used with a reflective codewheel or

codestrip, this device can sense rotary or linear position.

Features

• Reflective technology

• Surface mount SO-8 Package

• Two channel quadrature outputs for direction sensing

• Two encoding resolution options:

– 2.76 – 2.95 lines/mm

(70 – 75 lines/inch)

– 5.91 lines/mm

(150 lines/inch)

HEDR-8000 Series

Reflective Optical Surface Mount Encoders

Data Sheet

HEDR-8000 Series, HEDR-8100 Series

HEDR-8010 Series

LED

GND

CH A

CH B

GND

SIGNAL

PROCESSING

CIRCUITRY

RCODEWHEEL

CODESTRIP

Block Diagram

The reflective surface mount

optical encoders provide two

square wave outputs in quadra-

ture for count and direction

information. These TTL

compatible outputs correspond to

the alternating reflective/non-

reflective pattern of the

codewheel or codestrip.

The HEDR-8000/8100 series

encoders can be used over a

range of codewheel and codestrip

resolutions. The HEDR-8000/

8100 reflective encoder can

operate from 2.76 to 2.95 lines

per mm (70 to 75 lines per inch).

The HEDR-8100 can be used with

a codewheel or codestrip with

150 lines per inch (5.91 lines

per mm).

Applications

The HEDR-8000/8100 series

provides two channel motion

sensing at a very low cost, making

it ideal for high volume

applications. Its small size and

surface mount capability make it

ideal for printers, copiers, card

readers, and consumer product

applications.

Note: Avago 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 HEDR-8000/8100 series

combines an emitter and a

detector in a single surface mount

SO-8 package. When used with a

codewheel or codestrip, the

reflective sensors translates

rotary or linear motion into a two

channel digital output.

As seen in the block diagram, the

HEDR-8000/8100 series has three

key parts: a single light emitting

diode (LED) light source, a

photodetector IC with a set of

uniquely configured photodiodes,

and a pair of lenses molded into

the package. The lens over the

LED focuses light onto the

codewheel or codestrip. Light is

either reflected or not reflected

back to the lens over the

photodetector IC.

As the codewheel rotates or

codestrip passes by, an alternat-

ing pattern of light and dark

corresponding to the pattern of

the codewheel falls upon the

photodiodes. This light is used to

produce internal signals A and A,

and B and B. As part of this

“push-pull” detector system, these

signals are fed through compara-

tors to produce the final outputs

for channels A and B.

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 (φ): The number of

electrical degrees between the

center of the high state on channel

A and the center of the high state

on channel B. This value is

nominally 90°e.

Phase Error (∆φ): The deviation

in electrical degrees of the phase

from its ideal value of 90°e.

Direction of Rotation: When the

codewheel or codestrip moves in

the direction from pin 1 to pin 4,

as viewed when looking down on

the lenses, channel B will lead

channel A. If the codewheel or

codestrip moves in the opposite

direction, channel A will lead

channel B.

Optical Radius (Rop): For rotary

motion, the distance from the

codewheel’s center of rotation to

the center line connecting the two

lenses of the encoder.

Gap (G): The distance from the

top of the package to the surface of

the reflective codewheel or

codestrip.

Specular Reflectance (Rf): a

measure of a surface’s reflective

finish. This is quantified by the

amount of light reflected when hit

with an incident beam. A device

called a scatterometer is used to

quantify specular reflectance on a

percent scale. (Contact factory for

more information.)

Radial and Tangential

Misalignment Error (ER, ET):

For rotary motion, mechanical

misalignment in the radial and

tangential directions relative to the

codewheel.

Angular Misalignment Error

(EA): angular misalignment of the

sensor in relation to the tangential

direction. This applies for both

rotary and linear motion.

Output Waveforms

HEDR-8000

SHAFT

CODEWHEEL

RADIAL

TANGENTIAL

HEDR-8000

SHAFT

CODEWHEEL

S1 S2 S3 S4 φ

CH. B

CH. A

ALL FOUR STATES (S1 TO S4)

ARE MAINTAINED.

CODEWHEEL ROTATION OR LINEAR MOVEMENT

AMPLITUDE

Definitions

Count (N): For rotary motion,

the number of bar and window

pairs or counts per revolution

(CPR) of the codewheel. For

linear motion, the number of bar

and window pairs per unit length

(lines per inch [LPI] or lines per

mm [LPmm]).

One Cycle (C): 360 electrical

degrees (°e), 1 bar and window

pair.

One Shaft Rotation: 360

mechanical degrees, N cycles

(rotary motion only).

Line Density: The number of

reflective and non-reflective pairs

per unit length, expressed as

either lines per inch (LPI) or lines

per mm (LPmm).

Pulse Width (P): The number of

electrical degrees that an output

is high 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.

Encoding Characteristics

Encoding Characteristics over the Recommended Operating Conditions and Mounting Conditions.

Parameter Symbol Typical Maximum Units Notes

Pulse Width Error ∆P15 55 °e HEDR-8010

Pulse Width Error (Ch.A,Ch.B) ∆P16 75 °e HEDR-8100

Phase Error ∆f10 60 °e HEDR-8100

Pulse Width Error (Ch.A,Ch.B) ∆P 15,25 55,75 °e HEDR-8000

Phase Error ∆f12 60 °e HEDR-8000

Recommended Operating Conditions

Parameter Symbol Min. Typ. Max. Units Notes

Temperature TA-10 85 °C

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

LED Current ILED 13 15 18 mA See “Current Limiting

Resistor for LED”

Load Capacitance CL100 pF 2.7 KΩ Pull-Up

Count Frequency f 15 kHz Velocity (rpm) x N/60

Radial Misalignment ER±0.38 mm

(±0.015) (in.)

Tangential Misalignment ET±0.38 mm

(±0.015) (in.)

Angular Misalignment EA0±1.5 deg.

Codewheel or Codestrip G 1.52 2.03 2.54 mm HEDR-8000

Gap (0.060) (0.080) (0.100) (in.) HEDR-8010

G 1.02 1.52 2.03 mm HEDR-8100

(0.040) (0.060) (0.080) (in.)

Codewheel or Codestrip Rf60% As Measured on TMA

Specular Reflectance µscan Scope (see Note 1)

Codewheel/Codestrip Tilt CT0 1 deg.

Codewheel/Codestrip LPmm 2.76 2.95 lines/mm HEDR-8000

Resolution (LPI) (70) (75) (lines/in.) HEDR-8010

LPmm 5.91 lines/mm HEDR-8100

(LPI) 150 (lines/in.)

Note:

1. Contact factory for more information regarding measurement of specular reflectance.

Absolute Maximum Ratings

Storage Temperature, TS-40°C to 85°C

Operating Temperature, TA-10°C to 85°C

Supply Voltage, VCC -0.5 V to 7 V

Output Voltage, VO-0.5 V to VCC

Output Current per Channel, IOUT -1.0 mA to 5 mA

Note: Exposure to extreme light intensity (such as from flashbulbs or spotlights) can cause

permanent damage to device.

Note:

Typical Value was obtained at typical condition. Maximums were obtained over all range of recommended operating condition and mounting condition.

Parameter Symbol Min. Max. Units Notes

Window/Bar Ratio Ww/Wb 0.9 1.1

Specular Reflectance Rf60 85 Reflective Bars

– 10 Non-reflective Bars

Line Density LPmm 2.76 2.95 lines/mm HEDR-8000

(LPI) (70) (75) (lines/inch) HEDR-8010

LPmm 5.91 7.09 lines/mm HEDR-8100

(LPI) (150) (180) (lines/inch)

Window Length Lw 1.80 2.31 mm (inches) mm

(0.071) (0.091) (inches)

Contact factory for further information on compatible codewheel and codestrips.

Electrical Characteristics

Electrical Characteristics over Recommended Operating Conditions. Typical Values at 25°C.

Parameter Symbol Min. Typ. Max. Units Notes

Supply Current ICC 2.2 5.0 mA

High Level Output Voltage VOH 2.4 V IOH = -40 µA min.

Low Level Output Voltage VOL 0.4 V IOL = 3.86 mA

Rise Time tr150 200 ns CL = 25 pF

RL = 2.7 KΩ

Fall Time tf50 60 ns

Current Limiting Resistor

for LED

A resistor to limit current to the

LED is required. The recom-

mended value is 220 Ω (±10%)

and should be placed in series

between the 5 V supply and pin 8

of the device (VLED). This will

result in an LED current of

approximately 15 mA.

Recommended Codewheel and Codestrip Characteristics

ROP

2.03 ± 0.51

(0.080 ± 0.020)

11.00 mm (0.433 IN.) < ROP < ∞*

IR Soldering Conditions

The following recommended IR

soldering profile meets the

specifications of the Electronic

Industries Association of Japan

(EIAJ):

90 ± 30 S

30 ± 10 S

10 ± 1 S

235°C MAX.

230°C ± 5°C

200°C

TIME (S)

TEMPERATURE (°C)

150°C ± 10°C

Mounting Conditions

*These dimensions are for HEDR-8000.

Please refer to “Recommended Operating

Conditions” table for HEDR-8100.

1. 150 ±10°C for 90 ±30 seconds

2. Greater than 200°C for 30

±10 seconds

3. 230°C ±5°C for 10 ±1 second

RECOMMENDATION: Please

refer to Application Note 1079:

Design and Performance

Considerations with HEDR-8000

for additional product

information.

06 12

HEDR-5120# E *

H**

Ordering Information

A. Modules

HEDR-5120 OPT ROP = 11 mm, 2 channels

Resolution (Cycle/Rev) Shaft Diameter

E = 200 CPR 06 = 1/4 in.

H = 408 CPR 1/2 = 6 mm

B. Codewheel: reflective

HEDR-8

Resolution Type

0 = Low resolution

1 = High resolution

00 OPT 2

Lines/Inch Units in Shipping Tube

0 = 50 units

2 = 3 units (Designers kit)

3 = 100 units

4 = 1500 units

5 = 500 units

K = 75 LPI

P = 150 LPI

Q = 180 LPI

02345

HEDR-8000#2K ****

HEDR-8100#2P *****

HEDR-8100#2Q * *

HEDR-8010#2K *

In order to achieve the reflective

codewheel resolution stated, refer

below for suitable encoder

recommendation.

1. HEDR-5120#Exx, 200CPR to

be used with option K, 75LPI of

the encoder.

2. HEDR-5120#Hxx, 408CPR to

be used with option P, 150LPI of

the encoder.

For product information and a complete list of distributors, please go to our website: www.avagotech.com

Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Pte. in the United States and other countries.

5988-9452EN May 9, 2006