Datasheet Summary
Freescale Semiconductor Technical Data
Photoelectric Smoke Detector IC with I/O and Temporal Pattern Horn Driver
The CMOS MC145012 is an advanced smoke detector ponent containing sophisticated very-low-power analog and digital circuitry. The IC is used with an infrared photoelectric chamber. Detection is acplished by sensing scattered light from minute smoke particles or other aerosols. When detection occurs, a pulsating alarm is sounded via on-chip push-pull drivers and an external piezoelectric transducer.
The variable-gain photo amplifier allows direct interface to IR detectors (photodiodes). Two external capacitors, C1 and C2, C1 being the larger, determine the gain settings....