Nicera - Products

数字式红外传感器 P923 系列

Product model:P923SP/P923MP/P923BP/P903BP
Product code:P923SP/P923MP/P923BP/P903BP
Product features:输出数字信号
Product use:智能家居、网络摄像机、带无线通讯感应产品
Product description:咨询电话：021 65928117

The Digital Smart PIR Sensor , using application specific integrated circuit as a built-in chip ,The ASIC combines all required functions for a Passive Infra-Red (PIR) motion detector.

Motion detection is signaled through the push-pull REL output.

The ASIC interfaces directly to a PIR sensor element via a high impedance differential input. The PIR signal is converted to a 15 bit digital value.

All signal processing is performed digitally. The ASIC is assembled with a pyro-ceramic element in a hermetically sealed package.

Product introduction Product parameters

Features:

Using digital signal processing technology to process the pyroelectric signal.

A high impedance differential input as the sensing element input.

Uses a 16 bit precision AD converter to convert the voltage signal generated by the sensitive element into digital signal

Uses a two order Butterworth filter, to filter the digital signal, effectively filter various sources low frequency and high frequency noise.

Due to signal processing is completed in the shell shield,has the stronger ability of anti RF interference.

Low power consumption

Detailed Description：

Schematic Circuit:

Alarm Event Processor

The signal from the band pass filter is rectified. When the signal level exceeds the set sensitivity threshold, an internal pulse is generated. A second pulse is counted, when the signals changes sign and exceeds the threshold again.

Whenever 2 pulses appear within 4s, an alarm condition is detected and the REL output is activated. If the signal level is in excess of 5 times the selected threshold, 1 pulse will cause activation of the REL output.

Electrical Characteristics

1)．Absolute Maximum Ratings

Stresses beyond those listed below may cause permanent damage to the device. Exposure to absolute maximum ratings may affect the device reliability.

Parameter	Symbol	Min	Max	Unit
Supply Voltage	VDD	-0.3	3.6	V
Operating temperature		-20	50	℃
Current into any pin		-100	100	mA
Storage Temperature	TST	-30	60	℃

2)．Operating Conditions (T=25°C, The parameters listed below for normal operation and are specified for an ambient temperature of 25 degree Celsius)

Parameter	Symbol	Min	Typ	Max		Unit
Supply Voltage	VDD	2.7		3.3	V
Supply current	IDD			15	µA
Output REL
Output current low	IOL	10			mA	VOL<1V
Output current high	IOH	-10			mA	VOH>(VDD-1V)
Output active (On)time	TOH	2.3		4793	s	16 steps
Inputs SENS
Input voltage range		0		VDD	V	Adjustment between 0V And 1/4 VDD
Input leakage current		-1		1	µA
Threshold for pulse count	VTH	49		462	µV	128分档
Inputs ONTIME
Input voltage range		0		VDD	V	Adjustment between 0V And 1/4 VDD
Input leakage current		-1		1	µA
(On) time		2.3		4793	S
Input OEN
Input low voltage	VIL		0.6		V
Input high voltage	VIH		1.0		V
Input Current	II	-1		1	µA	VIN = VSS .. VDD
Band pass filter
LPF cutoff frequency				7	Hz

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