Ultralow noise, low latency, wide bandwidth, 3-axis digital accelerometer with a dedicated TDM interface


Automotive-grade MEMS motion sensor for in-cabin applications

A digital 3-axis MEMS motion sensor, the AIS25BA is designed to address automotive non-safety applications, in particular, wideband active noise control (ANC) and vibration monitoring.
In addition to an integrated self-test feature, the sensor includes a time-division multiplexing (TDM) interface for sensor data and an I²C interface for device configuration.

Key features

  • AEC-Q100 qualified
  • 3-axis accelerometer with user-selectable full-scale: ±3.85/±7.7 g
  • Wide and flat frequency response: from dc up to 2.4 kHz (typ)
  • Low latency (entire reading chain): 266 µs @ 2 kHz (typ)
  • Ultralow noise density (typ: 30 µg/√Hz for X and Y axes; 50 µg/√Hz for Z-axis)
  • TDM (8/16/24 kHz) slave interface for sensor data and I²C interface for configuration
  • Supply voltage: 1.71 V to 2.1 V
  • Extended temperature range from -40 °C to +125 °C
  • Embedded self-test
  • Compact package: LGA 2.5 x 2.5 x 0.86 mm 14-lead
  • 10000 g high shock survivability
  • Lead-free, ECOPACK and RoHS compliant

Application examples

speaker Wideband active noise control (ANC)
vibration monitoring Vibration monitoring

Recommended resources

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Ready-to-use kit provides the complete AIS25BA pinout and comes with the required decoupling capacitors on the VDD power supply line. A user-friendly graphical user interface (Unico-GUI) and dedicated software routines are also available for customizing applications.

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This GitHub repository contains the AIS25BA driver files (.h and .c) to be included, or linked directly as a git submodule, in your project. The driver is MISRA compliant and the documentation can be generated using the Doxygen tool.