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STMicroelectronics STHS34PF80 Low-power Infrared Sensor

High-sensitivity infrared (IR) sensor for presence and motion detection

The STHS34PF80 is an uncooled, factory-calibrated, infrared motion and presence detection sensor with operating wavelength between 5 µm and 20 µm.

The STHS34PF80 sensor has been designed to measure the amount of IR radiation emitted from an object within its field of view. The information is digitally processed by the ASIC, which can be programmed to monitor motion, presence, or an overtemperature condition.

Thanks to its exceptional sensitivity, the STHS34PF80 can detect the presence of a human being at a distance up to 4 meters without the need of an optical lens.

The STHS34PF80 is housed in a small 3.2 x 4.2 x 1.455 (max) mm 10-lead LGA package.

All Features

  • 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
    • SMD friendly
    • 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
  • Package Specifications
    • LGA 10-lead, 3.2 x 4.2 x 1.455 (max) mm
    • ECOPACK and RoHS compliant


  • Presence and proximity sensing
  • Alarm / security systems
  • Home automation
  • Smart lighting
  • IoT
  • Smart lockers
  • Smart wall pads

STHS34PF80 Block Diagram

STMicroelectronics — STHS34PF80 Block Diagram

STHS34PF80 Block Diagram of Presence Detection Algorithm

STMicroelectronics — STHS34PF80 Block Diagram of Presence Detection Algorithm


STEVAL-MKI231KA: Evaluation Kit

Composed by STHS34PF80 industrial board and standard DIL24 adapter

The STEVAL-MKI231KA demonstration board is a kit made up of an ad hoc PCB, mounting the STHS34PF80 low-power, high-sensitivity infrared sensor for presence and motion detection, which is connected through flat cable to a generic adapter board (STEVAL-MKIGIBV5) to make it compatible with the STEVAL-MKI109V3. An ad hoc plastic holder with a Fresnel lens (TMOS63-10) has been provided into the kit to verify best performances of the device.

STMicroelectronics — STEVAL-MKI231KA Evaluation Kit
STEVAL-MKI231KA Evaluation Kit Data Brief

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

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

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

All Features:

  • User friendly STHS34PF80 board
  • Complete STHS34PF80 pin-out for a standard DIL24 socket
  • Fully compatible with the STEVAL-MKI109V3 motherboard
  • RoHS compliant


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