AEDT-9340-T00

AEDT-9340-T00 Datasheet

AEDT-9340 Series High Temperature 115°C 1250/2500 CPR 6-Channel Commutation Encoder

Part	Datasheet
AEDT-9340-T00	AEDT-9340-T00 (pdf)

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AEDT-9340 Series High Temperature 115°C 1250/2500 CPR 6-Channel Commutation Encoder Data Sheet The AEDT-9340 optical encoder series are high temperature six channel optical incremental encoder modules. When used with a codewheel, these modules detect rotary position. Each module consists of a lensed LED source and a detector IC enclosed in a small plastic package. Due to a highly collimated light source and a unique photo detector array, these modules are extremely tolerant to mounting misalignment. The AEDT-9340 encoder has integrated commutation output channels U,V,W , two-channel quadrature outputs A,B , plus a third channel index output I . This ungated index output is a positive index pulse that is generated once for each full rotation of the codewheel. The AEDT-9340 encoder is designed for use with a codewheel that has an optical radius of 15 mm inch for 1250/2500 CPR, mm inch for 1024/2048 CPR and 12mm inch for 1000/2000 CPR. The quadrature, index, commutation signals and power supplied to encoder are accessed through eight 0.46mm square male connector pins located on 1.27mm pitch. The AEDT-9340 optical encoder provides advanced motion control detection. The integrated commutation outputs U,V, and W is equivalent to those produced by Hall Switches. Thus, this makes to encoder ideal for servo motor applications. Application of the AEDT-9340 solution also enables the system to be more compact, with a significantly reduced alignment time. This is due to the provision of alignment jigs for easier assembly into housed encoders. The encoder also provides superior switching accuracy due to a much lower hysteresis when compared to a Hall Switches. The commutation signals can easily be interchanged for Brushless DC motor of different rotor pole-pairs by simply switching to matching pole-pair codewheels. • Two-channel quadrature output with ungated index pulse A,B,I • Three-channel integrated commutation Output UVW Typical applications include industrial printers, plotters, tape drives, industrial and factory automation equipment. Note Avago Technologies encoders are not recommended for use in safety critical application, e.g., 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 AEDT-9340 optical encoder is an emitter/detector module. Coupled with a codewheel, these modules translate the rotary motion of a shaft into a six-channel digital output. The modules contain a single Light Emitting Diode LED as its light source. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED. Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photo detectors and the signal processing circuitry necessary to produce the digital waveforms. The codewheel rotates between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel. The photodiodes that detect these interruptions are arranged in a pattern that corresponds to the radius and design of the code-wheel. These detectors are also deliberately 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, /B, I, and /I. 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 mechanical degrees out of phase . The commutation feedback U, V, W signals are generated based on the codewheel design. Definitions One Cycle 360 electrical degrees °e . One Shaft Rotation 360 mechanical degrees. 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 The deviation, in electrical degrees, of the pulse width from its ideal value of 180°e. State Width S The numbers of electrical degrees between transitions 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. Commutation Accuracy The deviation, in mechanical degrees, after shaft rotates passes the reference point Index channel to the first U channel pulse. The measurement from middle of channel I to channel U. Phase The numbers of electrical 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 The deviation of the phase from its ideal value of 90°e. Direction of Rotation When the codewheel rotates in the clockwise direction viewing from 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 distance from the codewheel’s center of rotation to the optical center O.C of the encoder module. Index Pulse Width Po The number of electrical degrees that an index is high with reference to channel A or channel B during one full shaft rotation AEDT-9340 Technical Specifications Absolute Maximum Ratings Parameter Storage Temperature Operating Temperature Supply Voltage Min. Max. Units Volts Notes Recommended Operating Conditions Parameter Symbol Min. Ordering Information Encoder Only AEDT-9340 - W = 2500 CPR U = 2048 CPR T = 2000 CPR L = 1250 CPR J = 1024 CPR B = 1000 CPR For product information and a complete list of distributors, please go to our web site: Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies Limited in the United States and other countries. Data subject to change. Copyright 2005-2008 Avago Technologies Limited. All rights reserved. AV02-1102EN - April 4, 2008

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AEDT-9340 Series High Temperature 115°C 1250/2500 CPR 6-Channel Commutation Encoder

Data Sheet

The AEDT-9340 optical encoder series are high temperature six channel optical incremental encoder modules. When used with a codewheel, these modules detect rotary position. Each module consists of a lensed LED source and a detector IC enclosed in a small plastic package. Due to a highly collimated light source and a unique photo detector array, these modules are extremely tolerant to mounting misalignment.

The AEDT-9340 encoder has integrated commutation output channels U,V,W , two-channel quadrature outputs A,B , plus a third channel index output I . This ungated index output is a positive index pulse that is generated once for each full rotation of the codewheel.

The AEDT-9340 encoder is designed for use with a codewheel that has an optical radius of 15 mm inch for 1250/2500 CPR, mm inch for 1024/2048 CPR and 12mm inch for 1000/2000 CPR.

The quadrature, index, commutation signals and power supplied to encoder are accessed through eight 0.46mm square male connector pins located on 1.27mm pitch.

The AEDT-9340 optical encoder provides advanced motion control detection. The integrated commutation outputs U,V, and W is equivalent to those produced by Hall Switches. Thus, this makes to encoder ideal for servo motor applications. Application of the AEDT-9340 solution also enables the system to be more compact, with a significantly reduced alignment time. This is due to the provision of alignment jigs for easier assembly into housed encoders. The encoder also provides superior switching accuracy due to a much lower hysteresis when compared to a Hall Switches. The commutation signals can easily be interchanged for Brushless DC motor of different rotor pole-pairs by simply switching to matching pole-pair codewheels.
• Two-channel quadrature output with ungated index pulse A,B,I
• Three-channel integrated commutation Output UVW

Typical applications include industrial printers, plotters, tape drives, industrial and factory automation equipment.

Note Avago Technologies encoders are not recommended for use in safety critical application, e.g., 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 AEDT-9340 optical encoder is an emitter/detector module. Coupled with a codewheel, these modules translate the rotary motion of a shaft into a six-channel digital output.

The modules contain a single Light Emitting Diode LED as its light source. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED. Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photo detectors and the signal processing circuitry necessary to produce the digital waveforms.

The codewheel rotates between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel.

The photodiodes that detect these interruptions are arranged in a pattern that corresponds to the radius and design of the code-wheel. These detectors are also deliberately 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, /B, I, and /I. 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 mechanical degrees out of phase . The commutation feedback U, V, W signals are generated based on the codewheel design.

Definitions

One Cycle 360 electrical degrees °e .

One Shaft Rotation 360 mechanical degrees.

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 The deviation, in electrical degrees, of the pulse width from its ideal value of 180°e.

State Width S The numbers of electrical degrees between transitions 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.

Commutation Accuracy The deviation, in mechanical degrees, after shaft rotates passes the reference point Index channel to the first U channel pulse. The measurement from middle of channel I to channel U.

Phase The numbers of electrical 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 The deviation of the phase from its ideal value of 90°e.

Direction of Rotation When the codewheel rotates in the clockwise direction viewing from 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 distance from the codewheel’s center of rotation to the optical center O.C of the encoder module.

Index Pulse Width Po The number of electrical degrees that an index is high with reference to channel A or channel B during one full shaft rotation

AEDT-9340 Technical Specifications Absolute Maximum Ratings

Parameter Storage Temperature Operating Temperature Supply Voltage

Min.

Max.

Units

Volts

Notes

Recommended Operating Conditions

Parameter

Symbol Min.
Ordering Information Encoder Only

AEDT-9340 -

W = 2500 CPR U = 2048 CPR T = 2000 CPR L = 1250 CPR J = 1024 CPR B = 1000 CPR

For product information and a complete list of distributors, please go to our web site:

Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies Limited in the United States and other countries. Data subject to change. Copyright 2005-2008 Avago Technologies Limited. All rights reserved. AV02-1102EN - April 4, 2008

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Datasheet ID: AEDT-9340-T00 520031