DESCRIPTION

The M7621 integrated circuit combines all required functions for a single chip Passive Infra Red (PIR) light controller. It is

designed for load switching with a transistor or a relay in 3 wire AC and DC systems.

A conventional PIR sensor connects directly to the PIR input. The pull-down resistor and DC decoupling circuitry are integrated on

chip.

The PIR signal is converted to a 15 bit digital value. External potentiometers or resistors are used to set the operating parameters

for sensitivity, on-time, brightness, fade, CDS sensor and environment temperature correction. The corresponding voltage levels

are converted to digital values with a 4 bit resolution all signal processing is performed digitally.

FEATURES

‧ Digital signal processing

‧ Temperature compensation input

‧ Adjustment brightness.

‧ Adjustable PIR sensitivity

‧ Adjustable output turn-on time

‧ Retrigger / Non-retrigger function

‧ Dimmer function

‧ PWM output

‧ RELAY output

‧ SOP-16 package

APPLICATIONS

‧ PIR light controller, Motion Detector, Alarm system, Auto-door bell