Senba Sensing Technology Co., Ltd.
Light Switch 3Pins Intelligent PIR Sensor HM312
Light Switch 3Pins Intelligent PIR Sensor HM312

Light Switch 3Pins Intelligent PIR Sensor HM312

Overview

PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and don't wear out. For that reason they are commonly found in appliances and gadgets used in homes or businesses. They are often referred to as PIR, "Passive Infrared", "Pyroelectric", or "IR motion" sensors.


Feature

  • Slight movement can be detectable

  • High immunity to external noise (vibration, etc.)

  • Custom design is available.


Technical Data

1.Maximum Ratings

Characteristics

Symbol

Min. Value

Max. Value

Unit

Remarks

Working Temperature

TST

-20

85


Max.current

Into

-100

100

mA


Storage Temperature

TST

-40

125



2.Working Conditions (T=25°C, Vdd=3V,Except other requirements)

Characteristics

Symbol

Min.

Type

Max.

Unit

Remarks

Supply Voltage

VDD

2.7

3

3.3

V

IR=0.5mA

Working Current

IDD

9

12

15

μA


Sensitivity threshold value

VSENS


50


μV


Output REL

Output Low Current

IOL

10



mA

VOL<1V

Output High Current

IOH



-10

mA

VOL>(VDD-1V

Output Low current Lock time

TOL


2.3


s

Non-adjustable

Output High current Lock time

TOH


2.3


s


Oscillator & Filter

Low pass filter cut-off frequency




7

Hz


High pass filter cut-off frequency




0.44

Hz


Oscillator frequency on Chip

FCLK



64

kHz



Application

  • Security Equipment

  • Wireless security sensors

  • Security cameras

  • Security alarm system


FAQ

1.What can trigger a PIR sensor?

Five Causes of PIR False Alarms. The first cause of PIR false alarms is low or unstable voltage at the detector. Test to make sure the voltage at each PIR is above 13VDC and stable. The second cause of false alarms is sudden infrared movement / heat changes in view of the detector.

 

2.How do PIR sensors work?

When the sensor is idle, both slots detect the same amount of IR, the ambient amount radiated from the room or walls or outdoors. When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor, which causes a positive differential change between the two halves.

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