HEDS-970x, HEDS-972x Series Digital Output Small Optical Encoder Modules Data Sheet Description Features The HEDS-9700 series is a high performance, low cost, Small Size optical incremental encoder module. When operated Low Cost in conjunction with either a codewheel or codestrip, Multiple Mounting Options this module detects rotary or linear position. The module consists of a lensed LED source and a detector Wide Resolution Range IC enclosed in a small C-shaped plastic package . Due Linear and Rotary Options Available to a highly collimated light source and a unique photo- No Signal Adjustment Required detector array, the module is extremely tolerant to mounting misalignment. Insensitive to Radial and Axial Play The two channel digital outputs and 5V supply input are -40C to +85C Operating Temperature accessed through four solder-plated leads located on Two Channel Quadrature Output 2.54 mm (0.1 inch) centers. TTL Compatible The standard HEDS-9700 is designed for use with an 11 Single 5V Supply mm optical radius codewheel, or linear codestrip. Other Wave Solderable options are available. Please contact factory for more in- formation. 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.Applications Theory of Operation The HEDS-9700 provides sophisticated motion detection The HEDS-9700 is a C-shaped emitter/detector module. at a low cost, making closed-loop control very cost-com- Coupled with a codewheel, it translates rotary motion petitive Typical applications include printers, plotters, into a two-channel digital output. Coupled with a copiers, and oce automation equipment. codestrip, it translates linear motion into a digital output. Note: Avago Technologies encoders are not recom- mended for use in safety critical applications. Eg. ABS As seen in the block diagram, the module contains a braking systems, power steering, life support systems single Light Emitting Diode (LED) as its light source. The and critical care medical equipment. Please contact light is collimated into a parallel beam by means of a sales representative if more clarication is needed. single 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 Block Diagram processing circuitry necessary to produce the digital RESISTOR V CC waveforms. 3 LENS The codewheel/codestrip moves between the emitter and detector, causing the light beam to be interrupted PHOTO- by the pattern of spaces and bars on the code wheel/ DIODES COMPARATORS A codestrip. The photodiodes which detect these interrup- CHANNEL A + tions are arranged in a pattern that corresponds to the LED A - 2 radius and count density of the codewheel/codestrip. These detectors are also spaced such that a light period B CHANNEL B + on one pair of detectors corresponds to a dark period on B - 4 the adjacent pair of detectors. The photodiode outputs are fed through the signal processing circuitry. Two SIGNAL PROCESSING comparators receive these signals and produce the nal CIRCUITRY outputs for channels A and B. Due to this integrated GND phasing technique, the digital output of channel A is in quadrature with channel B (90 degrees out of phase). 1 CODE EMITTER SECTION DETECTOR SECTION WHEEL 2