RE46C146

www.DataSheet4U.com R&E International RE46C146 CMOS Photoelectric Smoke Detector ASIC with Intelligent Interconnect and Timer Mode Preliminary Product Specification General Description The RE46C146 is low power CMOS photoelectric type smoke detector IC. With minimal external components this circuit will provide all the required features for a photoelectric type smoke detector. The design incorporates a gain selectable photo amplifier for use with an infrared emitter/detector pair. An internal oscillator strobes power to the smoke detection circuitry for 100us every 10 seconds to keep standby current to a minimum. If smoke is sensed the detection rate is increased to verify an alarm condition. A high gain mode is available for push button chamber testing. In the diagnostic mode the photo amplifier output is available on pin 15 for production calibration of the photo chamber. A check for a low battery condition and chamber integrity is performed every 43 seconds when in standby. The temporal horn pattern for a smoke alarm condition supports the NFPA 72 emergency evacuation signal. An interconnect pin allows multiple detectors to be connected such that when one units alarms, all units will sound. The interconnect is compatible with certain types of CO interconnect signaling and when recognized will sound the temporal pattern for a carbon monoxide alarm. An internal 10 minute timer can be used for a reduced sensitivity mode. Features Internal Power On Reset...