Pyroelectric Infrared Sensor


Pyroelectric Infrared Sensor

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Programmable Digital PIR Sensor RS412

Overview

It is a low-power pyroelectric infrared sensor (PIR) for motion detection. Using the MCU for communication, when the RS412 performs continuous motion sensing, the MCU does not need to be activated, it only activates the external MCU when motion is detected. Motion detection results are sent out via the output interrupt signal. The algorithm for motion detection is programmable and can be changed by external MCU configuration. The PIR signal is converted into a 14-bit digital value on the chip, and then enters the motion algorithm detection unit. All signal processing is digital and supports motion detection result output and raw data output.


Feature

Power supply voltage range 1.6V~5.5V

Programmable detection standard and working mode

Digital signal processing

Ultra low power consumption

Power supply voltage measurement

Temperature measurement

Fast and stable power-on


Datasheet

Technical data

Description

Symbol

Min

Typical

Max

Unit

Remarks

VDD voltage

VDD

-0.3


5.5

V

25℃

Analog pin voltage


-0.3


VDD+0.3

V

25℃

Digital pin voltage


-0.3


VDD+0.3

V

25℃

Storage temperature


-30


80


Operating Conditions ( TAMB = +25  Typical VDD=3V)

Description

Conditions

Symbol

Min

Typical

Max

Unit

Operating temperature

Operating temperature range



-20


+70

Operating Voltage

Supply voltage


VDD

1.6


5.5

V

Supply current

Supply current, VPIR regulator on

VDD=3V, no load

IDD1


6

8

µA

Supply current, VPIR regulator off

VDD=3V, no load

IDD


3

5

µA

Input parameter SERIN

Input low voltage


VIL



0.2

VDD

Input high voltage


VIH

0.8



VDD

Input Current

VSS<VIN<VDD

IIN

-1


1

µA

Digital clock low time


tL

200



ns

Digital clock high time


tH

200



ns

Data Bit Write Time


tBW

2/FCLK


5/FCLK

µs

Write timeout


tWL

16/FCLK



µs

Data input and output pins INT/DOCI

Input low voltage


VIL



0.2

VDD

Input high voltage


VIH

0.8



VDD

Output current high

VOL>(VDD-1V)

IOH



-200

µA

Output current low

VOL<1V

IOL

200



µA

Input capacitance




5


pF

Force read setup time


TFR

2/FCLK




Interrupt clear time


tCL

2/FCLK




Digital clock low time


tL

200


tRA

ns

Digital clock high time


tH

200



ns

Read timeout


tRA

4/F



µs


Description

Conditions

Symbol

Min


Typical

Max

Unit

 

Supply voltage measurement

Resolution



590

650

720

µV/count

ADC output range



2^13

2^14-511


Counts

Temperature measurement (requires single point calibration)

Resolution




80


Counts/K

ADC output range



511


2^14-511

Counts

Value at 300K



6700

8200

9900

Counts

Oscillator and Filter

Filter cutoff frequency



FCLK * 1.41 / 2048 / PI

Hz

HPF cutoff frequency



FCLK /16 * 1.41 / 2048 / PI

Hz

On-chip oscillator frequency


FOSC

56

64

74

kHz

System clock


FCLK


FOSC/2




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SENBA Sensing Technology Co.,Ltd., was founded in 2005, with the focus on producing the top quality photoelectric components, such as PIR sensors, Photoresistors,Light Sensors, Flame detectors etc. Our strategic goal is to master the core technology.