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HEDS-974x Dataheets PDF



Part Number HEDS-974x
Manufacturers Hewlett-Packard
Logo Hewlett-Packard
Description LPI Small Optical Encoder Modules
Datasheet HEDS-974x DatasheetHEDS-974x Datasheet (PDF)

www.DataSheet4U.com Agilent HEDS-974x Series for 180, 300, 360 LPI Small Optical Encoder Modules Data Sheet Description The HEDS-974x series is a high performance, low cost, optical incremental encoder module. When operated in conjunction with codestrip, this module detects linear position. The module 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 t.

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www.DataSheet4U.com Agilent HEDS-974x Series for 180, 300, 360 LPI Small Optical Encoder Modules Data Sheet Description The HEDS-974x series is a high performance, low cost, optical incremental encoder module. When operated in conjunction with codestrip, this module detects linear position. The module 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 5 V supply input are accessed through four solder-plated leads located on 2.54 mm (0.1 inch) centers. Applications The HEDS-974x provides sophisticated motion detection at a low cost, making close-loop control very cost-competitive! 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, power steering, life support systems and critical care medical equipment. Please contact sales representative if more clarification is needed. Theory of Operation The HEDS-974x 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 the block diagram, 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 codestrip moves between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codestrip. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the count density of the Features • Small size • Multiple mounting options • Wide resolution range • Linear options available • No signal adjustment required • Insensitive to radial and axial play • –40°C to +85°C operating temperature • High resolution version of the HEDS-970x • Two-channel quadrature output • TTL or 5.0 V CMOS compatible • Single 5 V supply • Wave solderable • Integrated 2.5 KΩ pullup on outputs codestrip. 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 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 digital output of channel A is in quadrature with channel B (90 degrees out of phase). ESD WARNING: NORMAL PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE. Definitions Count (N) = the number of bar and window pairs or Counts Per Revolution (CPR) of the codewheel, or the number of Lines Per Inch (LPI) of the codestrip. 1 Shaft Rotation = 360 mechanical degrees = N cycles 1 Cycle (c) = 360 electrical degrees (°e) = 1 bar and window pair 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 four 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. 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 counterclockwise, as viewed looking down on the module (so the marking is visible), 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 (OC) 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): Distance from motor shaft center of rotation to center of alignment tab receiving hole. Absolute Maximum Ratings Parameter Storage Temperature Operating Temperature Supply Voltage Output Voltage Output Current per Channel Soldering Temperature Symbol TS TA VCC VO IO Min. –40 –40 –0.5 –0.5 –1.0 Max. 85 85 7 VCC 5 260 Units °C °C V.


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