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数字式红外传感器 P924-S 系列

  • Product model:P924SS/P924MS/P924BS/P904BS
  • Product code:P924SS/P924MS/P924BS/P904BS
  • Product features:可调整灵敏度,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
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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.

    Sensitivity / Threshold

    The voltage applied to the SENS input defines the threshold for the PIR signal which generates a pulse for the pulse counter, to determine an alarm condition. Connecting this input to VSS will result in the minimum possible threshold level, which is hardwired internally (offset) to avoid false detection due to zero threshold and detector noise. Any voltage above VDD/4 will select the maximum threshold, which is the least sensitive setting for PIR signal detection.



    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

    70

    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 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

    Band pass filter

    LPF cutoff frequency

    7

    Hz

    HPF cutoff frequency

    0.4

    Hz





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