Datasheet Microchip RE46C144E16F — Datenblatt

RE46C144
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Features General Description The RE46C144 is a low-power, CMOS photoelectrictype 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
75% Duty Cycle Horn Pattern
Internal Low Battery and Chamber Test
Compatible with Allegro A5358
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.
A check for a low-battery condition and chamber
integrity is performed every 43 seconds, when in …