Pyroelectric Infrared (PIR) Sensor Control Chip NSA3182FT100

Product Overview

The NSA3182 is a highly integrated control chip designed for pyroelectric infrared (PIR) sensors. It incorporates all essential components required for passive infrared motion detection. The analog front-end can be directly connected to analog PIR detectors via capacitive coupling. It features a built-in 3V LDO to power the PIR detector, along with a high-precision analog-to-digital converter that converts detector signals into digital data. The motion detection unit employs algorithms to distinguish moving heat sources, enhancing system anti-interference capability, and supports relay output. Both sensor sensitivity threshold and alarm duration can be adjusted via external resistors.

Key Features

Analog PIR signal input

Digital signal processing with human proximity alarm

Wide operating voltage range: 3.1–12V

Output capable of driving relays and LEDs

Adjustable sensitivity with 16-level timing control

Ultra-low power consumption

Built-in 3V LDO output

Package: SOP8

Applications

Pyroelectric motion detection

Intrusion detection

Smart lighting systems