AEDS-9620210 - Agilent / Hewlett-Packard

Agilent AEDS-962x for 300 LPI

Ultra Small Optical Encoder Modules

Data Sheet

Features

• Very small

• Low package height

• Built-in codewheel and codestrip

guide bumps

• Wide resolution range

• For linear and rotary applications

• No signal adjustment required

• Insensitive to radial and axial play

• 0˚C to +70˚C operating temperature

• Two-channel quadrature output

• TTL 3.3 V CMOS compatible

• Wave solderable

Description

This is a very small, low package

height and high performance

incremental encoder module. When

operated in conjunction with either

a codewheel or codestrip, this

module detects rotary or linear

position. The encoder consists of a

lensed LED source and a detector

IC enclosed in a small C-shaped

plastic package. Due to a highly

collimated light source and a unique

photodetector array, the module is

extremely tolerant to mounting

misalignment.

The two-channel digital outputs and

3.3 V supply input are accessed

through four solder plated leads

located on 2.00 mm (0.1 inch)

centers. The supply input of the

LED, rated at 16 mA, is accessed

through two leads located at

2.54 mm.

It is designed for use with an

23.36 mm optical radius codewheel

or linear codestrip. Other options

are available. Please contact the

factory for more information.

Applications

The AEDS-962x provides

sophisticated motion detection,

making closed-loop control very

cost effective. Typical

applications include printers,

plotters, copiers, and office

automation equipment.

Note: Agilent Technologies’

encoders are not recommended

for use in safety critical

applications, eg., ABS braking

systems and critical-care medical

equipment. Please contact a sales

representative if more

clarification is needed.

Theory of Operation

The AEDS-962x is a C-shaped

emitter/detector module. Coupled

with a codewheel, it translates

rotary motion into a two-channel

digital output. Coupled with a

codestrip, it translates linear

motion into digital outputs.

As seen in Figure 1, the 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 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

produce the digital waveforms.

The codewheel/codestrip moves

between the emitter and detector,

causing the light beam to be

interrupted by the pattern of

spaces and bars on the

codewheel/codestrip. The

photodiodes which detect these

interruptions are arranged in a

pattern that corresponds to the

radius and count density of the

codewheel/codestrip. These

detectors are also spaced such

that a light period on one pair of

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

Absolute Maximum Ratings

Parameter Symbol Min. Max. Units Notes

Storage Temperature TS–40 85 ˚C

Operating Temperature TA070˚C

Supply Voltage (Detector) VCC –0.5 7 V

Output Voltage VO–0.5 VCC V

Output Current per Channel IO–1.5 10 mA

Soldering Temperature 260 ˚C t ≤ 5 sec.

DC Forward Current (LED) ILED 50 mA VF < 1.8 V

Reverse Voltage VR5VI

= 100 µA

detectors corresponds to a dark

period on the adjacent pair of

detectors. The photodiode

outputs are fed through the signal

processing circuitry. Two

comparators receive these signals

and produce the final outputs for

channels A and B. Due to this

integrated phasing technique, the

output of channel A is in

quadrature with channel B (90

degrees out of phase).

Definitions

Note: Refer to Figure 2.

Count (N) = The number of bar

and window pairs or counts per

revolution (CPR) of the

codewheel.

One Cycle (C)

= 360 electrical degrees (˚e)

= 1 bar and window pair

One Shaft Rotation

= 360 mechanical degrees

= N cycles

each state width from its

ideal value of 90°e.

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 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 of

channel A and the center of the

high state of channel B.

Phase Error (∆φ): The deviation

of the phase from its ideal value

of 90˚e.

Direction of Rotation: When

the codewheel rotates in the

counterclockwise direction (as

viewed from the encoder end of

the motor), channel A will lead

channel B. If the codewheel

rotates in the clockwise 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.

Angular Misalignment Error

(EA): Angular misalignment of

the sensor in relation to the

tangential direction. This applies

for both rotary and linear motion.

Mounting Position (RM): The

distance from motor shaft center

of rotation to center of alignment

tab receiving hole.

Recommended Operating Conditions

Parameter Symbol Min. Typ. Max. Units Notes

Temperature TA025 70˚C

Supply Voltage (Detector) VCC 2.8 3.3 5.2 V Ripple < 100 mV p-p

Load Capacitance CLnone 100 pF

Pullup Resistor RPULL none kΩRecommend no pullup. Device has

integrated 2.2 KΩ on outputs.

Count Frequency f 40 kHz Velocity (rpm) x N/60

Angular Misalignment Error EA–3.0 0.0 +3.0 deg. Mounting Considerations

Mounting Position RMROP – 2.4 mm *Refer to Mounting Considerations

(ROP – 0.095") (inch)

DC Forward Current (LED) ILED 10 16 20 Recommended 110 Ω (±10%)

@ VCC = 3.3 V series resistor between 3.3 V

supply and VLED.

Electrical Characteristics

Electrical Characteristics over Recommended Operating Range, Typical at 25˚C.

Parameter Symbol Min. Typ. @ 3.3 V Max. Units Notes

Supply Current ICC 23 5 mA

(Detector)

High Level Output VOH 2.4 3 3.6 V When VOH = 2.4 (min.)

Voltage Typical IOH = –0.4 mA @ 3.3 V

Low Level Output VOL 0.4 V When VOL = 0.4 (min.)

Voltage Typical IOH = 13 mA @ 3.3 V

Rise Time tr200 ns CL = 25 pF, RL = 11 kΩ

Fall Time tf50 ns

LED Forward Voltage VF1.52 1.54 V

Note: Refer to Figure 2 for output waveform on tr and tf.

Encoding Characteristics

Encoding Characteristics Over the Recommended Operating Conditions and Mounting Conditions.

These characteristics do not include codewheel/codestrip contribution. The typical values are averages over

the full rotation of the codewheel.

Parameter Symbol Typical Maximum Units

Pulse Width Error ∆P 4 40 ˚e

Logic State Width Error ∆S 5 40 ˚e

Phase Error ∆φ 415˚e

Note: Recommended no pullup. Device has integrated 2.2 kΩ pullup resistor on Channel A & Channel B outputs.

Figure 1.

Figure 2.

S1 S2 S3 S4

2.4V

0.4V

CHANNEL B

CHANNEL A

ROTATION

AMPLITUDE

–CHANNEL A

–CHANNEL B

GND

SIGNAL

PROCESSING

CIRCUITRY

LED

GND 6

LED

LENS

PHOTO-

DIODES

PULLUP RESISTOR

2.5 K x 2

COMPARATORS

EMITTER SECTION CODE

WHEEL DETECTOR SECTION

AEDS-962x SERIES BLOCK DIAGRAM

Parameter Min. Max. Nominal Values Units

A Solder Pot Temperature NA 260 240 - 250 °C

B Preheat Zone Temperature 85 110 90 - 105 ° C

C Dip in Time 2.5 5.0 2.5 - 4.5 sec

D Solder Pot Zone (PCB Top) NA 160 <160 ° C

E Solder Pot Zone (Encoder Lead) 200 NA ≥ 200 ° C

Notes:

I. Nominal values are evaluated profiles for optimum performance.

2. Min./Max. are critical limits to ensure encoders in good condition.

Figure 3. Recommended wave solder profile.

100

150

200

PH 3 PH 2 PH 1 PROCESS COOLING

DEGREES C

Figure 4. Mounting consideration.

Error Symbol Rop = 11.00 mm Unit Notes

Gap EG± 0.15 mm Recommend CW be put closer to the detector side (upper side),

in order to keep enough margin for encoder operation.

Radial ER± 0.26 mm

Tangential ET± 0.28 mm

Angular EA± 3 °C

2.05 MIN.

2XR

Ø 2.05 HOLE MIN.

1.0 DEEP MIN.

4.30 (0.169) MAX

4.50 (0.177) MIN.

4.40 ± 0.15 (0.173 ± 0.006)

SEE NOTE

4.75 (0.187) MAX.

C OF ALIGNMENT TAB

± R

- 2.40 (0.094)

NOTE:

THESE DIMENSIONS INCLUDE SHAFT END PLAY AND CODEWHEEL WARP.

ALL DIMENSIONS FOR MOUNTING IN THE MODULE AND CODEWHEEL/CODESTRIP

SHOULD BE MEASURED WITH RESPECT TO THE TWO MOUNTING POSTS SHOWN ABOVE.

IMAGE SIDE OF CODEWHEEL / CODESTRIP

Package Dimensions

AEDS-9621

13.7 6.9

3.5

C – COUNTRY

OF ORIGIN

MARKING

(REFER -05

FOR DETAILS)

PART # (REFER -05)

RESOLUTION IDENTIFICATION

DATE CODE

OPTICAL CENTER MARK

XXXXX

Agilent

0.5

R 1.1

1.4

5.6

11.0

4.1

0.5

2.0

0.5

0.254

(LEADFRAME

THICKNESS)

1.8

7.6

2.6

MAX. EXTERNAL

RADIUS R 0.5

4.40

∅2.00

(2 PLACES)

7.0

0.8

1.0

YYWW

CHAMFERED

LEAD-IN

(BOTH SIDES)

(OPTICAL

CENTER)

(EMITTER)

(DETECTOR)

1.10

2 – ∅2.10 ± 0.05

4.40

11.0 ± 0.2

13.1± 0.2

1.27

2.54 TYP.

2.00 TYP.

1.00

6 – ∅1.00

MOUNTING FOOTPRINT

CH A

CH B

GND

XXXXX Agilent

YYWW

Package Dimensions

AEDS-9620

13.7 6.9

3.5

C – COUNTRY

OF ORIGIN

MARKING

(REFER -05

FOR DETAILS)

PART # (REFER -05)

RESOLUTION IDENTIFICATION

DATE CODE

OPTICAL CENTER MARK

XXXXX

Agilent

0.5

R 1.1

1.4

5.6

11.0

4.1

0.5

2.0

0.5

0.254

(LEADFRAME

THICKNESS)

1.8

7.6

2.6

MAX. EXTERNAL

RADIUS R 0.5

4.40

∅2.00

(2 PLACES)

7.0

0.8

1.0

YYWW

CHAMFERED

LEAD-IN

(BOTH SIDES)

(OPTICAL

CENTER)

(EMITTER)

(DETECTOR)

1.10

1.27

2.54 TYP.

2.00 TYP.

1.00

6 – ∅1.00

MOUNTING FOOTPRINT

CH A

CH B

VCC

GND

VCC

GND

XXXXX Agilent

YYWW

LEAD PITCH

2.56

LEAD PITCH

2.00

Ordering Information

Bracket Options

Lead Configuration Resolution Options

2 – Linear 0 – Straight Leads 2 – 300 LPI, Linear

1 – Bent Leads

AEDS-96 Option

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) 6271 2451

India, Australia, New Zealand: (+65) 6271 2394

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

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

Korea: (+65) 6271 2194

Malaysia, Singapore: (+65) 6271 2054

Taiwan: (+65) 6271 2654

Data subject to change.

November 26, 2002

5988-8275EN