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| HOA0902 Transmissive Encoder Sensor m o .c U t4 e e h S ta a .D w w w * Direct TTL interface * Resolution to 0.018 in.(.457) * Internal temperature compensation * 0.126 in.(3.2 mm) slot width * Two mounting configurations DESCRIPTION The HOA0902 assembly consists of a dual channel IC detector and an IRED encased in a black thermoplastic housing. The device is typically used with an interrupter strip or disk (code wheel) to encode the rate and direction of mechanical motion. Applications include linear and rotary encoders; it is especially suited for the encoding function in an optical mouse. INFRA-78.TIF FEATURES * Dual channel IC OUTLINE DIMENSIONS in inches (mm) Tolerance 3 plc decimals 0.005(0.12) 2 plc decimals 0.020(0.51) The detector is a monolithic IC which consists of two narrow adjacent photodiodes, amplifiers stages and quadrature logic circuitry which provides two outputs; (1) a fixed-duration, low level active tachometer (counting) pulse which is generated whenever the illumination level passes through the sensing threshold, and (2) a direction output which is set to a logic high or low level dependent on which of the two channels is illuminated first. The tachometer output is an NPN collector which is internally connected to VUU through a 10 ki (nominal) resistor; the direction output is a totempole configuration. Both outputs are capable of directly driving TTL loads. The IC design incorporates circuitry to compensate the sensitivity for the output power vs. temperature characteristic of the IRED. The tachometer pulse is generated at both the increasing and decreasing illumination thresholds of the sensing channel, resulting in two tach pulses for each mechanical period of the interrupter. The HOA0902 is designed to work with a mechanical period as small as 0.036 in.(.914 mm), providing resolution to 0.018 in.(.457 mm). For additional component information see SEP8506 and HLC2705. Housing material is polycarbonate. Housings are soluble in chlorinated hydrocarbons and ketones. Recommended cleaning agents are methanol and isopropanol. HOA0902-011 .315(8.0) .419(10.64) .020(0.51) SQ. LEADS TYP. .050 .083(2.1) OPTICALC L .181(4.60) .075(1.91) .05(1.27) 3 PLCS .488 (12.40) S .126(3.20) 4 6 .300(7.62) 3 5 1 2 E .090(2.3) .100(2.54) LEADS .100(2.54) 1. CATHODE 2. ANODE 3. SPEED 4. GND 5. Vcc 6. DIRECTION .500(12.7) MIN DIM_060.ds4 HOA0902-012 220 h Honeywell reserves the right to make changes in order to improve design and supply the best products possible. www..com DIM_060b.cdr HOA0902 Transmissive Encoder Sensor ELECTRICAL CHARACTERISTICS PARAMETER IR EMITTER SYMBOL MIN TYP MAX UNITS TEST CONDITIONS DETECTOR ABSOLUTE MAXIMUM RATINGS (25C Free-Air Temperature unless otherwise noted) Operating Temperature Range Storage Temperature Range Soldering Temperature (5 sec) IR EMITTER Power Dissipation Reverse Voltage Continuous Forward Current DETECTOR Supply Voltage Duration of Output Short to VUU or Ground Notes 1. Derate linearly 0.78 mW/C above 25C. SCHEMATIC -40C to 70C -40C to 85C 240C 100 mW [A] 3V 50 mA 5.5 V 1.0 sec. Honeywell reserves the right to make changes in order to improve design and supply the best products possible. h 221 HOA0902 Transmissive Encoder Sensor FUNCTIONAL BLOCK DIAGRAM sch_043.cdr OUTPUT CONFIGURATION WITH MOTION SCH_038.cdr OUTPUT TIMING DIAGRAM cir_012.cdr Fig. 1 IRED Forward Bias Characteristics gra_073.ds4 100 90 80 70 60 50 40 30 20 10 0 0.8 Forward current - mA Pulsed condition TA = 80C TA = 25C TA = -40C 1.0 1.2 1.4 1.6 1.8 2.0 Forward voltage - V Fig. 2 IRED Trigger Current vs Temperature gra_098.ds4 1.4 N * ormalized trigger current 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -75 -50 -25 0 25 50 75 100 125 Ambient temperature - C All Performance Curves Show Typical Values 222 h Honeywell reserves the right to make changes in order to improve design and supply the best products possible. HOA0902 Transmissive Encoder Sensor Honeywell reserves the right to make changes in order to improve design and supply the best products possible. h 223 |
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