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HEDR-8000 Datasheet(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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HEDR-8000 Datasheet(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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2 / 8 page  2 VLED GND VCC CH A CH B GND SIGNAL PROCESSING CIRCUITRY R CODEWHEEL OR CODESTRIP Block Diagram The reflective surface mount optical encoders provide two square wave outputs in quadra- ture for count and direction information. These TTL compatible outputs correspond to the alternating reflective/non- reflective pattern of the codewheel or codestrip. The HEDR-8000/8100 series encoders can be used over a range of codewheel and codestrip resolutions. The HEDR-8000/ 8100 reflective encoder can operate from 2.76 to 2.95 lines per mm (70 to 75 lines per inch). The HEDR-8100 can be used with a codewheel or codestrip with 150 lines per inch (5.91 lines per mm). Applications The HEDR-8000/8100 series provides two channel motion sensing at a very low cost, making it ideal for high volume applications. Its small size and surface mount capability make it ideal for printers, copiers, card readers, and consumer product applications. Note: Avago 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 HEDR-8000/8100 series combines an emitter and a detector in a single surface mount SO-8 package. When used with a codewheel or codestrip, the reflective sensors translates rotary or linear motion into a two channel digital output. As seen in the block diagram, the HEDR-8000/8100 series has three key parts: a single light emitting diode (LED) light source, a photodetector IC with a set of uniquely configured photodiodes, and a pair of lenses molded into the package. The lens over the LED focuses light onto the codewheel or codestrip. Light is either reflected or not reflected back to the lens over the photodetector IC. As the codewheel rotates or codestrip passes by, an alternat- ing pattern of light and dark corresponding to the pattern of the codewheel falls upon the photodiodes. This light is used to produce internal signals A and A, and B and B. As part of this “push-pull” detector system, these signals are fed through compara- tors to produce the final outputs for channels A and B. |
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