Three-axis MEMS accelerometer includes intelligent data processing functions

October 2, 2025

Issue 7 2025

The STMicroelectronics IIS2DULPX MEMS accelerometer performs free-fall detection, self-orientation and other functions, reducing the need for external components and helping designers to reduce system complexity.

The IIS2DULPX, a three-axis linear MEMS accelerometer from STMicroelectronics, provides a range of intelligent features and data processing capabilities which enable designers to integrate multiple functions and streamline the bill-of-materials.

 

These features include:

  • Always-on anti-aliasing filtering
  • Finite state machine
  • Machine learning core (MLC) with adaptive self-configuration
  • Analog hub and charge variation (Qvar) sensing channel

 

The finite state machine and MLC produce impressive, always-on processing capabilities which operate at the edge.

 

The sensor has selectable full scales of ±2 g/±4 g/±8 g/±16 g, and measures acceleration in three axes at output data rates from 1.6 Hz to 800 Hz.

 

The IIS2DULPX has a dedicated internal engine which implements motion and acceleration detection functions, including free-fall detection, wake-up, single-, double-, triple-tap recognition, activity/inactivity detection, and 6D/4D orientation.

Features

  • MIPI I3C® interface
  • 128-level FIFO buffer
  • 220 μg/√Hz noise
  • Four operating modes:
    • 9.3 μA operating current in high-performance mode with anti-aliasing filter
    • 6.5 μA current in low-power mode
      with anti-aliasing filter
    • 3 μA current in ultra low-power mode
    • One-shot mode
  • Digital I2C/SPI/MIPI I3C® interface
  • Up to 400 Hz bandwidth
  • Operating-temperature range: -40°C to 105°C

Applications

  • Anti-tampering devices
  • Asset tracking equipment
  • Robots
  • Industrial safety equipment
  • Portable healthcare devices
  • Hearing aids
  • Black boxes
Extra_FTMIssue72025_ST_IIS2DULPX_Accelerometer

Evaluation Board

Part Number: STEVAL-MKI246KA

The STMicroelectronics STEVAL-MKI246KA adapter board enables fast system prototyping and evaluation of the IIS2DLPX, a three-axis linear MEMS accelerometer. The board is connected to a STEVAL-MKIGIBV5 adapter board to render it compatible with the STEVAL-MKI109D microcontroller evaluation platform.

 

The STEVAL-MKIGIBV5 can be plugged into a standard DIL-24 socket. The kit provides the complete IIS2DULPX pinout and comes ready to use with the required decoupling capacitors on the power supply line.

 

The STEVAL-MKI109D evaluation platform 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 MEMS Studio graphical user interface, or dedicated software routines for customized applications.

 

It is also possible to plug the kit into an X-NUCLEO-IKS02A1 or STEVAL-STWINBX1 board using an ad hoc connector mounted on the STEVAL-MKI246A board.

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