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HEDS-9041J08 Datasheet(PDF) 2 Page - Agilent(Hewlett-Packard) |
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HEDS-9041J08 Datasheet(HTML) 2 Page - Agilent(Hewlett-Packard) |
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2 / 12 page  2 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, 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 degrees out of phase). The output of the comparator for I and I is sent to the index processing circuitry along with the outputs of channels A and B. The final output of channel I is an index pulse PO which is generated once for each full rotation of the codewheel. This output PO is a one state width (nominally 90 electrical degrees), high true index pulse which is coincident with the low states of channels A and B. Block Diagram Theory of Operation The HEDS-9040 and 9140 are emitter/detector modules. Coupled with a codewheel, these modules translate the rotary motion of a shaft into a three- channel digital output. As seen in the block diagram, 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 photodetectors 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 photo- diodes which detect these interruptions are arranged in a pattern that corresponds to the radius and design of the code- The HEDS-9040 and 9140 have two channel quadrature outputs plus a third channel index output. This index output is a 90 electrical degree high true index pulse which is generated once for each full rotation of the codewheel. The HEDS-9040 is designed for use with a HEDX-614X codewheel which has an optical radius of 23.36 mm (0.920 inch). The HEDS-9140 is designed for use with a HEDS-5140 codewheel which has an optical radius of 11.00 mm (0.433 inch). The quadrature signals and the index pulse are accessed through five 0.025 inch square pins located on 0.1 inch centers. Standard resolutions between 256 and 2000 counts per revolution are available. Consult local Agilent sales representatives for other resolutions. Applications The HEDS-9040 and 9140 provide sophisticated motion control detection at a low cost, making them ideal for high volume applications. Typical applications include printers, plotters, tape drives, and industrial and factory 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. |
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