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HEDS-5120-C06 Datasheet(PDF) 2 Page - Agilent(Hewlett-Packard) |
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HEDS-5120-C06 Datasheet(HTML) 2 Page - Agilent(Hewlett-Packard) |
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2 / 7 page  2 Standard resolutions for the HEDT-9000 are 500 CPR and 1000 CPR for use with a HEDS- 6100 codewheel or equivalent. For the HEDT-9100, standard resolutions between 96 CPR and 512 CPR are available for use with a HEDS-5120 codewheel or equivalent. Applications The HEDT-9000 and 9100 provide sophisticated motion detection at a low cost, at temperatures to 125 °C, making them ideal for high volume automotive applications. 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 HEDT-9000 and 9100 are C- shaped emitter/detector modules. Coupled with a codewheel, they translate the rotary motion of a shaft into a two-channel digital output. As seen in the block diagram, each 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 polyetherimide 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 product the digital waveforms. The codewheel rotates between the emitter and detector, causing the light beam to be interrupted Block Diagram Output Waveforms by the pattern of spaces and bars on the codewheel. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and design of the code- wheel. 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 then fed through the signal processing circuitry resulting in A, A, B, and B. 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 that of channel B (90 degrees out of phase). Definitions Count (N): The number of bar and window pairs or counts per revolution (CPR) of the codewheel. |
Similar Part No. - HEDS-5120-C06 |
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Similar Description - HEDS-5120-C06 |
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