STMicroelectronics X-NUCLEO-CCA02M2

Overview

X-NUCLEO-CCA02M2 from STMicroelectronics is a digital MEMS microphone expansion board for STM32 Nucleo platforms, featuring two on-board MP34DT06J omnidirectional stereo microphones and support for synchronized acquisition from up to four microphones via I²S, SPI, DFSDM or SAI peripherals. It enables rapid prototyping of voice capture, far-field audio preprocessing, and embedded speech recognition systems.

For engineers reviewing the X-NUCLEO-CCA02M2 datasheet, X-NUCLEO-CCA02M2 pinout, X-NUCLEO-CCA02M2 application, or X-NUCLEO-CCA02M2 equivalent, this board delivers verified PDM-to-digital audio streaming, Arduino UNO R3 and ST morpho connector compatibility, and firmware-ready integration with STM32Cube middleware for USB audio streaming and algorithm development.

Technical Context

The board implements dual MP34DT06J MEMS microphones with PDM output, routed to STM32 Nucleo host MCU through configurable digital interfaces including I²S (master/slave), SPI (for control), DFSDM (for high-fidelity PDM decimation), and SAI (for multi-channel synchronization). Clocking supports both internal oscillator-derived MIC_CLK and external clock injection via MIC_CLK_x2 header.

It provides hardware-level microphone source selection (on-board vs. coupon board), LED indicators for microphone activity (MIC_LED), and jumper-configurable power routing (5 V from USB or Nucleo). The design includes ESD protection (ESDA7P60-1U1M) and USB transient suppression (USBLC6-2SC6U1) for robust host interface operation.

Key Specifications

Availability

X-NUCLEO-CCA02M2 is available at Aetrix Electronics and suitable for voice-controlled IoT gateways, industrial voice logging systems, and edge AI audio preprocessing platforms requiring stable component supply and rapid evaluation turnaround.

Supply support for X-NUCLEO-CCA02M2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, sensors, power ICs, and analog/mixed-signal devices for industrial, automotive, and consumer applications.

The X-NUCLEO series targets rapid prototyping of sensor and connectivity subsystems for STM32-based embedded systems, with CCA02M2 specifically engineered to accelerate development of PDM microphone arrays and real-time audio signal chains.

FAQ

Does X-NUCLEO-CCA02M2 require external power or can it be powered solely by the STM32 Nucleo board?

Yes - it can be powered exclusively by the STM32 Nucleo board via the ST morpho connector when SB1 jumper is set to OFF. Alternatively, it accepts 5 V from its USB Mini-B port when SB1 is ON, enabling standalone operation without Nucleo power dependency.

Which STM32 Nucleo boards are compatible with X-NUCLEO-CCA02M2?

It is mechanically and electrically compatible with all STM32 Nucleo-64 and Nucleo-144 boards that implement the ST morpho connector layout (e.g., NUCLEO-F401RE, NUCLEO-H743ZI2, NUCLEO-L476RG), as confirmed in DB4016 schematic alignment and STM32Cube firmware validation reports.

Can X-NUCLEO-CCA02M2 stream audio directly to a PC as a USB audio device?

Yes - the included STM32Cube firmware sample implements USB Audio Class 1.0 (UAC1) to present itself as a stereo USB microphone to Windows, macOS, and Linux hosts, delivering synchronized PDM-decimated audio at up to 48 kHz without additional drivers.

What microphone coupon boards are supported, and how many can be used simultaneously?

It supports STEVAL-MIC001V1 (MP34DT05-A), STEVAL-MIC002V1 (MP34DT06J), and STEVAL-MIC003V1 (IMP34DT05) via six dedicated slot positions. Up to two coupon boards may be installed concurrently, enabling synchronized 4-microphone acquisition alongside the two on-board units.