HEDS-973x Series Small Optical Encoder Modules Data Sheet Description Features Small size The HEDS-973x series is a high performance, low cost, optical incremental encoder module. When operated in Low cost conjunction with either a codewheel or codestrip, this Multiple mounting options module detects rotary or linear position. The module Wide resolution range consists of a lensed LED source and a detector IC enclosed Linear and rotary options available in a small C-shaped plastic package. Due to a highly No signal adjustment required collimated light source and a unique photodetector array, Insensitive to radial and axial play the module is extremely tolerant to mounting misalignment. C to +85C operating temperature - 40 High resolution version of the HEDS-970x Two channel quadrature output TTL compatible Single 5 V supply Wave solderable Package Dimensions Mounting Option 50 - Standard (Baseplane Mounting) Contact Factory for Detailed Package Dimensions ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.The two channel digital outputs Theory of Operation The codewheel/codestrip moves and 5 V supply input are accessed between the emitter and detector, The HEDS-973X is a C-shaped through four solder-plated leads causing the light beam to be inter- emitter/detector module. Coupled located on 2.54 mm (0.1 inch) rupted by the pattern of spaces with a codewheel, it translates centers. and bars on the codewheel/code- rotary motion into a two-channel strip. The photodiodes which digital output. Coupled with a The standard HEDS-973x is detect these interruptions are codestrip, it translates linear designed for use with an 11 mm arranged in a pattern that corre- motion into a digital output. optical radius codewheel, or sponds to the radius and count linear codestrip. Other options density of the codewheel/code- As seen in the block diagram, the are available. Please contact strip. These detectors are also module contains a single Light factory for more information. spaced such that a light period on Emitting Diode (LED) as its light one pair of detectors corresponds source. The light is collimated Applications to a dark period on the adjacent into a parallel beam by means of pair of detectors. The photodiode The HEDS-973x provides a single lens located directly over outputs are fed through the signal sophisticated motion detection at the LED. Opposite the emitter is processing circuitry. Two com- a low cost, making closed-loop the integrated detector circuit. parators receive these signals and control very cost-competitive This IC consists of multiple sets produce the final outputs for Typical applications include of photodetectors and the signal channels A and B. Due to this printers, plotters, copiers, and processing circuitry necessary to integrated phasing technique, the office automation equipment. produce the digital waveforms. digital output of channel A is in . quadrature with channel B (90 Note: Avago Technologies degrees out of phase). encoders are not recommended for use in safety critical applications. Eg. ABS braking systems, power steering, life support systems and critical care Block Diagram medical equipment. Please contact sales representative if more clarification is needed. 2