Senba Sensing Technology Co., Ltd.
SMD Type PIR Sensor S18-L232B-2
SMD Type PIR Sensor S18-L232B-2

SMD Type PIR Sensor S18-L232B-2

Overview

S18-L232B-2 is a PIR sensor to detect changes of infrared ray. The sensor can detect the heat source which is changing or moving from human body. Widely used in human body sensor switches, alarms, infrared testers, smart-house appliances, and household appliances.


Features

  • Mini SMD with reflowed SMT

  • Digital signal processing(DSP)

  • Power adjustable, save more energy

  • Built-in filter, high immunity to RFI

  • Output time, sensitivity and light

  • control non-adjustable

  • Low voltage, micro power consumption


Technical Data

1. Maximum Ratings

Characteristics

Symbol

Min. Value

Max. Value

Unit

Remarks

Working Temperature

TOT

-30

70


Storage Temperature

TST

-40

80


Max.current for pin

Into

-100

100

mA


Viewing angle


X=110°

Y=90°



Detection spectral response

λ

5

14

μm



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

Characteristics

Symbol

Min.

Type

Max.

Unit

Remarks

Supply Voltage

VDD

2.2

3

3.3

V


Working Current

IDD

9

9.5

11

μA


Sensitivity

VSENS


90


μV

Non-adjustable

Output REL

Output Low Current

IOL

10




VOL<1V

Output High Current

IOH



-10

mA

VOL>(VDD-1V)

Low REL output locking time

TOL


2


s

Non-adiustable

High REL output delay time

TOL


2


s

Non-adiustable

Oscillator &Band Pass Filter(BPF)

Band Pass Filter(BPF)  Low cut-off frequency




7

Hz


Band Pass Filter(BPF)  High cut-off frequency




0.44

kHz


Oscillator frequency on Chip

FCLK




kHz





Interior Block Diagram





S18-L232B-2 interior blck diagram.jpg



SMD Type PIR sensor S18-L232B-2.jpg


Applications

  • 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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