Friday, March 1, 2024

Advanced IR Sensor For Building Automation Detection

By Nidhi Agarwal

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The IR sensor marks a leap forward in human presence and motion detection, offering the ability to sense stationary objects with a lens-free design, enhancing efficiency and adaptability.

IR sensor

STMicroelectronics, a semiconductor industry, has launched a new human-presence and motion detector. The company claims that the device is designed to augment security systems, home automation equipment, and IoT devices, which generally utilize passive infrared (PIR) sensing technology. The STHS34PF80 sensor, equipped with thermal transistors, can detect stationary objects. This sets it apart from traditional PIR detectors that necessitate movement in the detected object to generate a measurable response. Additionally, whereas conventional PIRs rely on a Fresnel lens to sense movement, this innovative detector enables a more straightforward, lens-free construction, simplifying the overall design. The sensor incorporates a smart algorithm specifically designed for presence and motion detection, making it an optimal choice for alarms, security systems, home automation, smart lighting, Internet of Things (IoT) devices, smart lockers, and smart wall pads.

 The sensor can cover a substantial area with its lens-free range extending to four meters and an 80° field of view. Notably, its operating current of 10µA results in lower power consumption than that of a traditional PIR, making it more energy-efficient. The 3.2mm x 4.2mm x 1.455mm surface-mount package is compact and well-suited for automated high-speed assembly. Additionally, the sensor exhibits strong resistance to the potentially disruptive effects of direct lighting and boasts high immunity to electromagnetic interference (EMI).

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The sensor includes thermal MOSFETs (TMOS) sensitive to infrared radiation, integrated with digital readout circuitry on the same chip using silicon-on-insulator (SOI) CMOS technology. The design thermally isolates the TMOS for accurate temperature sensing and allows sub-threshold voltage operation, enabling the detection of human presence, whether moving or still. The sensor’s low power consumption supports extended battery life, while standard CMOS fabrication ensures cost-effective production with small sensor dimensions. Unlike PIR sensors dependent on pyroelectric-pixel size, the device’s integrated digital interface allows direct host connection without analogue front-end circuitry.

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