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CIRCUIT060004

Low-noise and long-range PIR sensor conditioner circuit

CIRCUIT060004

Overview

This two stage amplifier design amplifies and filters the signal from a passive infrared (PIR) sensor. The circuit includes multiple low–pass and high–pass filters to reduce noise at the output of the circuit to be able to detect motion at long distances and reduce false triggers. This circuit can be followed by a window comparator circuit to create a digital output or connect directly to an analog–to–digital converter (ADC) input.
Features
  • Single 5V Supply 
  • Passes frequencies between 0.7Hz - 10Hz 
  • AC Gain: 90dB
General-purpose op amps
TLV9062 — Dual, 5.5-V, 10-MHz operational amplifier
MSP430 microcontrollers
MSP430FR2310 — 16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC MSP430FR2311 — 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/DAC, 10-bit ADC MSP430FR2353 — 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD MSP430FR2355 — 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Precision op amps (Vos<1mV)
OPA376 — Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp
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Technical documentation

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Type Title Date
* Circuit design Low-noise long-range PIR sensor conditioner circuit MSP430 smart analog combo (Rev. B) PDF | HTML 09 Oct 2024
* Circuit design Low-noise and long-range PIR sensor conditioner circuit (Rev. A) 29 Jan 2024
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. D) 24 Sep 2024
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 24 Oct 2019
Design guide Low-Noise PIR Signal Chain Reference Design With Less False Alarm 19 Nov 2018
Design guide Advanced Motion Detector Using PIR Sensors Reference Design for False Triggers (Rev. B) 16 Oct 2017
Application note Design of Ultra-Low Power Circuits for Battery-Powered Wireless PIR Motion Detec (Rev. A) 12 May 2017
Application note Cost-Optimized Opamp Window Comparator for Ultra-low Power PIR Motion Detectors 06 Mar 2017
Design guide Ultra-Low-Power Wireless PIR Motion Detector Reference Design 28 Feb 2017
Design guide Low-Power PIR Motion Detector With 10-Year Coin Cell Battery Design Guide (Rev. B) 15 Dec 2016
Design guide Low-PWR PIR Motion Detector w/ Sub1GHz Wireless Connectivity for 10-Yr Batt Life (Rev. B) 25 Oct 2016

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