Infrared motion sensor detects people at a range of up to 4 m

The STMicroelectronics STHS34PF80 infrared motion sensor is highly sensitive, and provides a broad range of configuration options, including output data rate and detection mode.

The STMicroelectronics STHS34PF80 infrared motion and heat-detection sensor is sensitive enough to detect the presence of a person at a distance of up to 4 metres without the need for a lens.


The uncooled STHS34PF80 is factory-calibrated to provide accurate sensor measurements. Raw optical sensor outputs are digitally processed by the STHS34PF80’s embedded ASIC, which can be programmed to monitor for motion, presence, or over-temperature. The sensor is capable of detecting stationary objects, and of distinguishing between stationary and moving objects.


The output data rate is configurable in a range between 0.25 Hz and 30 Hz. The STHS34PF80 is housed in a 10-lead LGA package measuring 3.2 mm x 4.2 mm x 1.5 mm. The package is compatible with surface-mount assembly processes.


  • Integrated silicon IR filter
  • Low power consumption
  • 80° field of view
  • Supply-voltage range: 1.7 V to 3.6 V
  • 10 µA supply current
  • I2C and serial peripheral interfaces
  • ±0.3°C local temperature sensor accuracy


  • Alarm/security systems
  • Home automation
  • Smart lighting
  • IoT devices
  • Smart lockers
  • Smart wall pads

Evaluation Board

Part Number: STEVAL-MKI231KA

The STEVAL-MKI231KA demonstration board provides a hardware platform for evaluating the STHS34PF80, an infrared motion and presence-detection sensor from STMicroelectronics.


The demo board is connected through flat cable to a generic adapter board, the STEVAL-MKIGIBV5, to make it compatible with the STEVAL-MKI109V3 microcontroller board. An ad hoc plastic holder with a Fresnel lens (TMOS63-10) has been provided in the kit to enable the designer to verify the in-application performance of the device.


The STEVAL-MKIGIBV5 can be plugged into a standard DIL 24 socket. The kit supports the complete STHS34PF80 pin-out, and comes ready-to-use with the required decoupling capacitors on the power supply line.


This adapter is supported by the STEVAL-MKI109V3 motherboard, which includes a high performance 32-bit MCU functioning as a bridge between the sensor and a PC, on which it is possible to use the downloadable graphical user interface, or dedicated software routines for customized applications.


It is also possible to plug the board into an X-NUCLEO-IKS01A3, X-NUCLEO-IKS02A1 or X-NUCLEO-IKS4A1 board. The kit is supported by an X-CUBE-MEMS1 expansion software package for STM32 MCUs.

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STMicroelectronics — STHS34PF80 Motion Sensor

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