HEDS-9731#B51

HEDS-9731#B51 Datasheet

HEDS-9730, HEDS-9731 Small Optical Encoder Modules 480lpi Digital Output

Part	Datasheet
HEDS-9731#B51	HEDS-9731#B51 (pdf)

Related Parts	Information
HEDS-9731#251	HEDS-9731#251
HEDS-9733#T51	HEDS-9733#T51
HEDS-9731#151	HEDS-9731#151
HEDS-9732#U50	HEDS-9732#U50

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HEDS-9730, HEDS-9731 Small Optical Encoder Modules 480lpi Digital Output Data Sheet The HEDS-973X is a 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 Cshaped 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 3.3V supply input are accessed through four solder plated leads located on 2.54mm 0.1inch centers. The standard HEDS-973X is designed for use with an appropriate optical radius codewheel or linear codestrip. Other options are available. Please contact the factory for more information. • Small Size • High Resolution • Two Channel Quadrature Output • Linear and Rotary Applications • No Signal Adjustment required • TTL or 3.3V/5V CMOS Compatible • Wave Solderable • Lead-free Package • -40°C to 85°C Operating Temperature • Single 3.3V Supply Block Diagram RESISTOR LENS PHOTODIODES COMPARATORS VCC 3 CHANNEL A 2 The HEDS-973X provides sophisticated motion detection, making closed loop control very cost competitive. Typical applications include printers, plotters, copiers and automation equipment. Note Avago Technologies’ encoders are not recommended for use in safety critical applications, e.g., ABS braking systems and critical-care medical equipment. Please contact a sales representative if more is needed. EMITTER SECTION CODE WHEEL CHANNEL B SIGNAL PROCESSING CIRCUITRY 1 DETECTOR SECTION Figure 1 ESD WARNING NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE. Theory of Operation A HEDS-973X 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 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 photodetectors and a 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 photodiodes are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pairs of detectors. The photodiode outputs are fed through the signal processing circuitry. Two comparators receive these signal and produce the 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 . Output Waveforms AMPLITUDE CHANNEL A CHANNEL B Figure ROTATION Note Refer to Figure 2 1 shaft Rotation = 360 degrees = N cycles 1 cycle c = 360 electrical degree, equivalent to 1 bar and window pair. 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 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 The deviation in electrical degrees of each state width from its ideal value of 90°e. Phase 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 for quadrature output. Phase Error The deviation in electrical degrees of the phase from its ideal value of 90°e. Direction of Rotation When the codewheel rotates in the counter-clockwise 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 then tangential direction. This applies for both rotary and linear motion. Ordering Information HEDS - 973 Option Lead Configurations 0 - Straight leads 1 - Bent leads Resolution 3 - 480 LPI Bracket Option 50 Package Dimension Option 50 LEAD THICKNESS = mm LEAD PITCH = mm OPTICAL CENTER 2x ± OPTION CODE PART # REFER -05 AVAGO YYWW 50 PIN 1 ID DATE CODE C = COUNTRY OF ORIGIN MARKING REFER -05 FOR DETAILS Bent Version - Option 50 LEAD THICKNESS = mm LEAD PITCH = mm OPTICAL CENTER 2x ± 5° TYP. OPTION CODE PART # REFER -05 AVAGO YYWW 50 GND PIN 1 ID DATE CODE C = COUNTRY OF ORIGIN MARKING REFER -05 FOR DETAILS Wave Soldering 7 sec MAX. 260°C Y-AXIS 120° C/20 sec MAX. X-AXIS FLOW COOL DOWN Parameter Min. Max. Nominal values

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HEDS-9730, HEDS-9731 Small Optical Encoder Modules 480lpi Digital Output

Data Sheet

The HEDS-973X is a 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 Cshaped 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 3.3V supply input are accessed through four solder plated leads located on 2.54mm 0.1inch centers.

The standard HEDS-973X is designed for use with an appropriate optical radius codewheel or linear codestrip. Other options are available. Please contact the factory for more information.
• Small Size
• High Resolution
• Two Channel Quadrature Output
• Linear and Rotary Applications
• No Signal Adjustment required
• TTL or 3.3V/5V CMOS Compatible
• Wave Solderable
• Lead-free Package
• -40°C to 85°C Operating Temperature
• Single 3.3V Supply

Block Diagram

RESISTOR LENS

PHOTODIODES COMPARATORS

VCC 3

CHANNEL A 2

The HEDS-973X provides sophisticated motion detection, making closed loop control very cost competitive. Typical applications include printers, plotters, copiers and automation equipment.

Note Avago Technologies’ encoders are not recommended for use in safety critical applications, e.g., ABS braking systems and critical-care medical equipment. Please contact a sales representative if more is needed.

EMITTER SECTION CODE WHEEL

CHANNEL B

SIGNAL PROCESSING CIRCUITRY
1 DETECTOR SECTION

Figure 1

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

Theory of Operation

A HEDS-973X 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 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 photodetectors and a 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 photodiodes are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pairs of detectors. The photodiode outputs are fed through the signal processing circuitry. Two comparators receive these signal and produce the 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 .

Output Waveforms

AMPLITUDE

CHANNEL A CHANNEL B

Figure

ROTATION

Note Refer to Figure 2
1 shaft Rotation = 360 degrees
= N cycles
1 cycle c = 360 electrical degree, equivalent to 1 bar and window pair.

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 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 The deviation in electrical degrees of each state width from its ideal value of 90°e.

Phase 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 for quadrature output.

Phase Error The deviation in electrical degrees of the phase from its ideal value of 90°e.

Direction of Rotation When the codewheel rotates in the counter-clockwise 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 then tangential direction. This applies for both rotary and linear motion.
Ordering Information

HEDS - 973

Option

Lead Configurations 0 - Straight leads 1 - Bent leads

Resolution 3 - 480 LPI

Bracket Option 50

Package Dimension

Option 50

LEAD THICKNESS = mm LEAD PITCH = mm

OPTICAL CENTER
2x ±

OPTION CODE

PART #

REFER -05

AVAGO

YYWW 50

PIN 1 ID

DATE CODE

C = COUNTRY OF ORIGIN MARKING REFER -05 FOR DETAILS

Bent Version - Option 50

LEAD THICKNESS = mm LEAD PITCH = mm

OPTICAL CENTER 2x ±
5° TYP.

OPTION CODE

PART #

REFER -05

AVAGO

YYWW 50 GND

PIN 1 ID

DATE CODE

C = COUNTRY OF ORIGIN MARKING REFER -05 FOR DETAILS

Wave Soldering
7 sec MAX. 260°C

Y-AXIS
120° C/20 sec MAX. X-AXIS

FLOW

COOL DOWN

Parameter

Min.

Max.

Nominal values

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived HEDS-9731#B51 Datasheet file may be downloaded here without warranties.

Datasheet ID: HEDS-9731#B51 520291