NS412 is a type of PIR sensor which integrates a digital control circuit and a human detection sensor in an electromagenetic shielding housing.The human body detection sensor couples the sensed human movement signal to the digital intelligent integrated circuit chip through a very high impedance differential input circuit.The digital intelligent integrated circuit converts the signal into digital signal, and when the PIR signal exceeds the selected digital threshold, there will be a delayed REL level output. The time parameter is set through the resistance to control the continuous working delay time of the electrical appliance. All the signal processing is done on one chip.
★ Digital signal processing,no drift and aging
★ High power supply rejection ratio, anti-radio frequency
★ A second-order Butterworth bandpass filter with built-in
infrared sensor to shield input interference at other
★ Ontime adjustable
★ Good stability and effective suppression of repeated
★ Low power consumption and simple application circuit
1.Absolute Maximum Ratings
Electrical characteristics(beyond those listed below may cause permanent damage to the device. Exposure to absolute maximum ratings may affect the device reliability.
Current into any pin
2. Operating Conditions (T=25°C, Vdd=3V，unless stated otherwise)
Output current high
Low REL output locking time
High REL output delay time
Input voltage range
Adjustable between 0V and VDD/2
Input leakage current
Oscillator and Filter
LPF cutoff frequency
HPF cutoff frequency
On chip oscillator frequency
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