RE46C145
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Features: General Description: The RE46C145 is a 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. Internal Power On Reset
Low Quiescent Current Consumption
ESD Protection on all Pins
Interconnect up to 40 Detectors
10 Minute Timer for Sensitivity Control
Temporal Horn Pattern
Internal Low Battery and Chamber Test
Compatible with Allegro A5366
Alternate Diagnostic Mode
UL Recognized per File S24036 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 100 Вµs 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 diagnostic mode, the photo amplifier output is available on pin 15 for production calibration of the photo
chamber. …
