STMicroelectronics X-NUCLEO-CCA02M1

Overview

X-NUCLEO-CCA02M1 from STMicroelectronics is an expansion board for STM32 Nucleo development platforms, integrating the MP34DT01-M digital MEMS microphone and supporting stereo PDM audio capture with hardware-accelerated digital filtering. It delivers 61 dB SNR, –26 dBFS sensitivity, and 120 dBSPL acoustic overload point in a compact HCLGA-4 package. Designed for rapid prototyping of voice-enabled embedded applications including speech recognition, VoIP clients, and A/V eLearning devices.

For engineers reviewing the X-NUCLEO-CCA02M1 datasheet, X-NUCLEO-CCA02M1 pinout, X-NUCLEO-CCA02M1 application, or X-NUCLEO-CCA02M1 equivalent, this page provides verified mechanical integration details, PDM interface timing constraints, stereo channel selection logic, supply decoupling guidance, and OEM-ready sourcing support - all validated against ST's official hardware user manual UM1913 and schematic revision 3 (2014).

Technical Context

The board implements a dual-microphone stereo configuration using two MP34DT01-M sensors, each with independent L/R pin control and synchronized PDM output routed to STM32 I²S/PDM peripherals. Clock synchronization is achieved via dedicated CLK lines driven by the host MCU at 2.4 MHz nominal frequency.

It supports hardware-based high-pass filtering and decimation through STM32's DFSDM peripheral, enabling direct PCM conversion without external DSP. The board includes 100 nF + 10 µF ceramic decoupling per microphone, EMI-shielded layout, and top-port acoustic inlet alignment compliant with ST's MP34DT01-M mechanical recommendations.

Key Specifications

Availability

X-NUCLEO-CCA02M1 is available at Aetrix Electronics and suitable for voice-controlled IoT gateways, industrial voice logging systems, and educational robotics platforms requiring stable component supply, long-term BOM continuity, and RoHS-compliant manufacturing traceability.

Supply support for X-NUCLEO-CCA02M1 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, analog ICs, MEMS sensors, and power solutions for industrial, automotive, and consumer markets.

The X-NUCLEO-CCA02M1 belongs to ST's Nucleo ecosystem expansion board family, engineered to accelerate audio feature development on STM32 MCUs - specifically targeting low-power, high-fidelity voice acquisition in resource-constrained embedded systems.

FAQ

Does X-NUCLEO-CCA02M1 require external biasing or analog amplification?

No. The board uses the MP34DT01-M, a fully integrated digital MEMS microphone with built-in CMOS interface delivering PDM output directly. No external amplifier, bias circuitry, or ADC is needed - the signal connects straight to STM32's DFSDM or I²S/PDM peripheral for digital processing.

Can X-NUCLEO-CCA02M1 be used with non-ST MCUs?

Yes, but with hardware and firmware adaptation. Its PDM outputs are electrically standard (3.3 V logic, 2.4 MHz clock), so any MCU supporting PDM input (e.g., Nordic nRF52840, ESP32-S3) can interface it. However, ST-provided HAL drivers and DFSDM-based filtering are STM32-specific and not portable.

What is the acoustic inlet orientation and mounting requirement?

The MP34DT01-M sensors use top-port design: sound enters vertically through the metal cap surface. The board places both microphones with unobstructed top-side access. Mounting must avoid covering the acoustic inlets or applying pressure to the caps - per ST's mechanical guidelines, no force >7 psi during pick-and-place.

Is stereo channel separation handled in hardware or software?

Hardware-based. Each MP34DT01-M has a dedicated L/R pin tied to separate GPIOs on the Nucleo header. Setting one L/R high and the other low configures left/right PDM streams independently. Timing alignment is ensured by shared CLK, enabling sample-synchronous stereo capture without software resampling.