RE46C191
CMOS Low-Voltage Photoelectric Smoke Detector ASIC
with Interconnect and Timer Mode
Features: General Description: The RE46C191 is a low-power, low-voltage CMOS
photoelectric-type smoke detector IC. With minimal
external components, this circuit provides all the
required features for a photoelectric-type smoke
detector. Two AA Battery Operation
Low Quiescent Current Consumption
Local Alarm Memory
Interconnect up to 40 Detectors
Nine-Minute Timer for Sensitivity Control
Temporal or Continuous Horn Pattern
Internal Low Battery and Chamber Test
All-Internal Oscillator
Internal Infrared Emitter Diode (IRED) Driver
Adjustable IRED Drive Current
Adjustable Hush Sensitivity
Two percent Low Battery Set Point
Pin-for-Pin Compatible with RE46C190 The design incorporates a gain-selectable photo
amplifier for use with an infrared emitter/detector pair.
To keep the standby current to a minimum, an internal
oscillator strobes power to the smoke detection …
