STMicroelectronics – Digital MEMS microphone expansion board compatible with STM32 MCUs


STMicroelectronics’ X-NUCLEO- CCA02M1 is an evaluation board which provides a feature-rich development platform for users of its MEMS microphones.

The X-NUCLEO-CCA02M1 board includes two MP34DT01-M digital microphones. It also has six slots for plugging-in digital-microphone coupon boards such as the STEVAL-MKI129Vx and STEVAL-MKI155Vx. The board enables the synchronised acquisition and streaming of sound from up to four microphones through I2S, SPI or DFSDM peripherals.

Equipped with an ST morpho connector, the board is also compatible with STM32 Nucleo microcontroller boards, enabling users to integrate microphone functionality into systems based on an STM32 microcontroller.

The MP34DT01-M itself is a compact, low-power, omnidirectional digital MEMS microphone. Its IC interface is manufactured in a CMOS process and includes a dedicated circuit which provides a digital signal externally in the Pulse Density Modulation (PDM) format.

The MP34DT01-M has an acoustic overload point of 120dB with a 61dB signal-to-noise ratio and sensitivity of -26dB.


  • Free comprehensive development firmware library
  • Compatible with STM32Cube firmware
  • USB streaming sample application
  • Arduino UNO R3 connector


  • Portable media players
  • Mobile communications devices


Orderable Part Number: X-NUCLEO-CCA02M1