8-pin infrared pyroelectric special chip, simple peripheral circuit, low cost 
Low static power consumption, less than 45uA when working at 3V, less than 75uA when working at 5V, very suitable for battery-powered system applications 
High input impedance operational amplifier, can be matched with a variety of sensors, signal processing, can be used as a microwave human body sensing processing chip 
Bidirectional amplitude detector, can effectively suppress interference 
Built-in reference voltage for internal comparator and op amp 
Built-in delay time timer and blockade time timer, change the oscillator frequency to set the timing delay time 
There are few peripheral components, and only the gain of the first stage op amp and the RC device of the oscillator can be reliably worked

Infrared Alarm / Voice Greeter 
Infrared sensor light 
Automatic door control 
Automatic lighting system 
Microwave radar sensor switch