Products >数字式红外传感器 P924 系列 >product details

数字式红外传感器 P924 系列

  • Product model:P924SP/P924MP/P924BP/P904BP
  • Product code:P924SP/P924MP/P924BP/P904BP
  • Product features:可调整灵敏度、工作照度、延时时间,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
【Return to list】

数字智能热释电传感器P906B,采用专用模数混合处理集成电路作为内置处理芯片,该集成电路组合了单个被动红外热释电移动探测器所需要的完整功能。

高输入阻抗的输入端用于接入热释电敏感元,热释电信号被转换成16位的数字信号,并被进一步进行数字带通滤波处理,然后和可调节的阈值做比较获得移动探测信号,移动探测信号从一个推拉式REL输出端输出,一个数字式输入端允许REL输出或者禁止REL输出,可作为转换照度控制端,灵敏度和延迟时间可以在对应的输入端用直流电压来设定,灵敏度设定端的电压被转换成7位分辨率的数字值,延迟时间设定端电压被转换成4位分辨率的数字值,分成16档延迟时间选项。所有的信号处理都在芯片上完成。

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.

    Threshold of sensitivity, ONtime can be adjusted by an external voltage.

    With light sensor application input,sensors can be controlled to function below the set illuminance 

    Low power consumption

    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.

    ON TIME

    The voltage applied to the ONTIME input determines how long the REL output stays active after the last alarm condition has been detected. If multiple alarm conditions are detected during the on time period, the on time is re-started whenever an alarm condition is detected. The on time period is derived from the oscillator frequency and will have a spread accordingly.






    Step

    Pin voltage

    Center of step voltage value 

    ONTIME(s)

    (VDD*(Step*2)+3)/128

    (typ)

    0

    3/128 or less

    2.3

    1

    (VDD*2+3)/128

    4.7

    2

    (VDD*4+3)/128

    7

    3

    (VDD*6+3)/128

    9.4

    4

    (VDD*8+3)/128

    18.7

    5

    (VDD*10+3)/128

    37

    6

    (VDD*12+3)/128

    56

    7

    (VDD*14+3)/128

    75

    8

    (VDD*16+3)/128

    150

    9

    (VDD*18+3)/128

    300

    10

    (VDD*20+3)/128

    449

    11

    (VDD*22+3)/128

    599

    12

    (VDD*24+3)/128

    1198

    13

    (VDD*26+3)/128

    2397

    14

    (VDD*28+3)/128

    3595

    15

    (VDD*30+3)/128 or above

    4793



    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

    Outpucurrent low

    IOL

    10

    mA

    VOL<1V

    Outpucurrent high

    IOH

    -10

    mA

    VOH>(VDD-1V)

    Output activ(Ontime

    TOH

    2.3

    4793

    s

    1steps

    Inputs ONTIME

    Input voltage range

    0

    VDD

    V

    Adjustment    between   0V

    And 1/4 VDD

    Input leakage current

    -1

    1

    µA

     (Ontime

     

    2.3

    4793

    S

     

    Band pass filter

    LPF cutoff frequency

    7

    Hz

    HPF cutoff frequency

    0.4

    Hz


Copyright 2016 www.china-sns.com Shanghai Nicera The sensor limited company All Rights Reserved

close