PIR Sensor Application in Security

Pyroelectric Infrared Sensor integrates digital intelligent control circuit and human body detection sensitive element in electromagnetic shielding cover. The human body detection sensor couples the sensed human body movement signal to the digital intelligent integrated circuit chip through a very high impedance differential input circuit, and the digital intelligent integrated circuit converts the signal into an ADC digital signal. When the PIR signal exceeds the selected digital threshold There will be a timed REL level output. The OEN enable terminal enables the REL output or automatic control by the light sensor. Sensitivity and time parameters are set by voltage divider resistors. All signal processing is done on-chip.