The RE46C202 is a next generation 9-volt, low current programmable photoelectric smoke detector IC. This circuit will provide all the required features for a photoelectric smoke detector with minimal external components. Programmable setup, calibration and feature selection are the key to reduced component count and reduced manufacturing costs. The programmable feature set provides a highly flexible means of designing a smoke detector with different features using a single IC. The design incorporates a gain selectable integrating photo amplifier for use with an infrared emitter/detector pair. An internal oscillator strobes power to the smoke detection circuitry for 5ms every 10 seconds to keep standby current to a minimum.