New Thermal Sensors from ST Can Detect Stationary Objects
The STHS34PF80 includes an embedded smart algorithm for presence and motion detection
STMicroelectronics is launching a novel human-presence and -motion detector to enhance security systems, home-automation equipment, and IoT devices that typically use passive infrared (PIR) sensing.
The STHS34PF80 sensor contains thermal transistors that can detect stationary objects, unlike conventional PIR detectors that require the detected object to be moving to produce a measurable response from the sensor. Also, while PIRs need a Fresnel lens to sense moving objects, ST’s novel detector allows simpler, lens-free construction.
“Today’s smart homes, smart buildings, and IoT applications need accurate presence detection to improve control of systems such as lighting, heating, security, and safety monitoring for a sustainable future,” said Simone Ferri, General Manager, AMS MEMS Sub-Group, STMicroelectronics. “Our new STHS34PF80 is an economical, ultra-low-power sensor that lets building automation operate consistently whether detected occupants are moving or not. It’s made using an innovative combination of CMOS chip fabrication, silicon micromachining, and low-voltage circuit design capabilities.”
Embedding a smart algorithm for presence and motion detection, the STHS34PF80 targets alarms and security systems, home automation, smart lighting, IoT devices, smart lockers, and smart wall pads. Its lens-free range of four meters and 80° field of view cover a large area in front of the sensor. With operating current of 10µA, power consumption is less than a conventional PIR, and the 3.2mm x 4.2mm x 1.455mm surface-mount package is compact and suited to automated high-speed assembly. The sensor has high resistance to unwanted effects of direct lighting and high immunity to electromagnetic interference (EMI).
Features of the STHS34PF80 High-sensitivity Infrared (IR) Sensor include:
- Key features
- High-sensitivity infrared presence and motion detection sensor
- Reach up to 4 meters without lens for objects measuring 70 x 25 cm²
- Integrated silicon IR filter
- Capable of detecting stationary objects
- Capable of distinguishing between stationary and moving objects
- 80° field of view
- Factory calibrated
- Low power
- Embedded smart algorithm for presence / motion detection
- Electrical specifications
- Supply voltage: 1.7 V to 3.6 V
- Supply current: 10 µA
- 2-wire I²C / 3-wire SPI serial interface
- Programmable ODRs from 0.25 Hz to 30 Hz
- One-shot mode
- Sensing specifications
- IR sensitivity: 2000 LSB/°C
- RMS noise: 25 LSBrms
- Operating wavelength: 5 µm to 20 µm
- Local temperature sensor accuracy: ±0.3 °C
More information on the STHS34PF80 High-sensitivity Infrared (IR) Sensor is available on the ST website at STMicroelectronics STHS34PF80 product page.
The STMicroelectronics website address is www.st.com.
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[Reprinted with kind permission from STMicroelectronics - Release Date, 24th July, 2023]