GENERAL DESCRIPTION
The M75210 is a very low-power IC providing all of the required features for a photoelectric type smoke detector. It is
designed for operate at supply voltage as low as 2.7V and suited to 3V Lithium battery powered application. A variable-gain
photo amplifier can be directly interfaced to an infrared emitter / detector pair. The amplifier gain levels are determined by
two external capacitors that are then internally selected depending on the operating mode. Low gain is selected during standby.
During a local alarm this low gain is increased (internally) by ~ 10% to reduce false triggering. High gain is used during the
push-button test and during standby to periodically monitor the chamber sensitivity. The internal oscillator and timing
circuitry keeps standby power to a minimum by sensing for smoke every 10 seconds in a 100 μs window.
FEATURES
‧ Operating voltage range 2.7V ~ 5V
‧ Local or Remote Smoke Alarm output.
‧ Low-Battery Trip Point Set Externally
‧ Power-on Reset.
‧ Built-in circuits to reduce false triggering.
‧ Average Supply Current: 4μA @VDD=3.0V
‧ ESD-Protection circuitry on all pins.
APPLICATIONS
‧ Smoke detector.