HOA0902

HOA0902 Transmissive Encoder Sensor m o .c U 4 t e e h S a t 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 VÙÙ through a 10 kì (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...