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HEDS-9040 Datasheet(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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HEDS-9040 Datasheet(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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2 / 13 page  2 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 out- put. 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 theemitter anddetector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel. The photodiodes which detect these interruptions are arranged in a pat- tern that corresponds to the radius and design of the codewheel. 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 photo- diode outputs are then fed through the signal process- ing 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 tech- nique, 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 in- dex processing circuitry along with the outputs of chan- nels A and B. The final output of channel I is an index pulse P O which is generated once for each full rotation of the codewheel. This output P O is a one state width (nomi- nally 90 electrical degrees), high true index pulse which is coincident with the low states of channels A and B. 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 HEDx-5x4x 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 Avago sales repre- sentatives 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: Avago Technologies encoders are not recommend- ed for use in safety critical applications. Eg. ABS braking systems, power steering, life support systems and critical care medical equipment. Please contact sales represen- tative if more clarification is needed. |
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