Motion detector

Products and reference designs

Motion detector

Block diagram


Motion or occupancy detectors are used to detect security threats, save energy by efficient lighting control and trigger other IoT enabled devices. Our integrated circuits and reference designs help you add different technologies (passive infrared sensor (PIR), mmWave radar, microwave, ultrasonic, time-of-flight, etc.) to your system.

Design requirements

  • Long battery life of more than 10 years
  • Extremely low-noise analog signal chain for long detection range (10m – 15m)
  • Low settling time of amplifier stages
  • False trigger avoidance due to environmental changes
  • Ability to accurately detect and classify objects, such as human versus pet

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Block diagram

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Technical documentation

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Type Title Date
Technical article Detect. Sense. Control: Simplify building automation designs with MSP430™ MCUs PDF | HTML 30 Aug 2023
Application brief Reduce False Triggers and Extend Battery Life in PIR Sensing Applications 29 May 2018
Application brief Ultra-Low Power Designs With the CC13x2 and CC26x2 Sensor Controller 27 Feb 2018
Technical article How ultrasonic technology improves convenience and performance in home automation PDF | HTML 23 Aug 2023
Technical article A smarter world will arrive in waves PDF | HTML 22 Jul 2023
Technical article Bringing new intelligence to industrial applications with mmWave sensors PDF | HTML 21 Jul 2023
White paper Bringing intelligent autonomy to fine motion detection (Rev. A) 20 Dec 2018
More literature Techniques for PIR-based motion detection 16 Dec 2020
More literature Techniques for PIR-based motion detection 16 Dec 2020
Application note Design of Ultra-Low Power Circuits for Battery-Powered Wireless PIR Motion Detec (Rev. A) 12 May 2017
Application note Extend Battery Life with <100 nA IQ Buck Converter Achieving <150 µV Voltage Rip (Rev. A) PDF | HTML 11 May 2022
Application note Wireless Motion Detector With Sub-1 GHz SimpleLink™ Wireless MCU (Rev. C) 10 May 2022
White paper Introduction to Time-of-Flight Camera (Rev. B) 07 May 2014
Application note Cost-Optimized Opamp Window Comparator for Ultra-low Power PIR Motion Detectors 07 Mar 2017
White paper The fundamentals of millimeter wave radar sensors (Rev. A) 06 May 2021
Application brief Power Cycling an IoT System with a Nano-power System Timer 06 Dec 2016
Circuit design Low-power sensor measurements: 3.3-V, 1-ksps, 12-bit, single-ended, single-suppl (Rev. A) 03 Dec 2021
Circuit design Low-power sensor measurements: 3.3-V, 1-ksps, 12-bit, single-ended, dual-supply (Rev. A) 03 Dec 2021
Application note Precision Voltage Offset: When Does it Matter? (Rev. A) 02 Nov 2016

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