GENERAL DESCRIPTION

The M75110 is a very low-power IC providing all of the required features for a photoelectric type smoke detector.

This device can be used in conjunction with an infrared photoelectric chamber to sense scattered light from smoke particles.

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 and timer modes. 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.

FEATURES

‧ Interconnect up to 50 detectors.

‧ Piezoelectric horn driver.

‧ Power-on reset.

‧ Built-in circuits to reduce false triggering.

‧ 6V to 12V operating voltage range.

‧ Average Supply Current：12μA

‧ ESD-Protection circuitry on all pins.

‧ Temporal horn pattern.

APPLICATIONS

‧ Smoke detector.