STMicroelectronics STEVAL-MIC002V1

Overview

STEVAL-MIC002V1 from STMicroelectronics is a daughterboard expansion module featuring four MP34DT06J top-port digital MEMS microphones, designed for PDM audio capture and integration with the X-NUCLEO-CCA02M1 carrier board. It operates from 1.6 V to 3.6 V, delivers 64 dB SNR, -26 dBFS ±1 dB sensitivity, and 122.5 dBSPL acoustic overload point for robust far-field voice acquisition in compact embedded systems.

For engineers reviewing the STEVAL-MIC002V1 datasheet, STEVAL-MIC002V1 pinout, STEVAL-MIC002V1 application, or STEVAL-MIC002V1 equivalent, this board supports multi-microphone PDM streaming, NBW algorithm validation, and STM32-based voice interface prototyping with verified signal routing and power integrity per DB3614.

Technical Context

The STEVAL-MIC002V1 implements a fixed-function microphone array interface: each MP34DT06J provides single-bit PDM output synchronized to an external clock (CLK1), with left/right channel selection via L/R1 control. All four microphones share common VDD1 and GND1 rails and are electrically isolated per channel for crosstalk suppression.

Signal routing follows ST's reference layout for PDM timing integrity-data (DATA1) and clock (CLK1) traces are length-matched and impedance-controlled on the 2-layer PCB, supporting sampling up to 1.536 MHz while maintaining <1 ns skew across channels for coherent beamforming preprocessing.

Key Specifications

Availability

STEVAL-MIC002V1 is available at Aetrix Electronics and suitable for voice interface prototyping, far-field speech recognition validation, and multi-microphone algorithm development requiring stable component supply and traceable ST original hardware.

Supply support for STEVAL-MIC002V1 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, specializing in microcontrollers, analog ICs, MEMS sensors, and power solutions for industrial, automotive, and consumer applications.

The STEVAL-MIC002V1 belongs to ST's STM32 ecosystem evaluation platform family, engineered to accelerate voice-enabled IoT device development with validated hardware interfaces for PDM microphone arrays and DFSDM peripheral integration.

FAQ

What is the primary interface protocol supported by STEVAL-MIC002V1?

The board uses Pulse Density Modulation (PDM) as its sole digital output protocol. Each MP34DT06J microphone outputs a synchronous single-bit PDM stream referenced to an externally supplied clock (CLK1) and left/right channel select (L/R1), enabling direct connection to STM32 DFSDM inputs without additional conversion circuitry.

Can STEVAL-MIC002V1 operate independently without X-NUCLEO-CCA02M1?

No-it is a daughterboard with no onboard voltage regulation, MCU, or host interface. It requires the X-NUCLEO-CCA02M1 carrier board for power distribution, clock generation, and PDM-to-I2S/PCM conversion. The CON6 connector (J1) is mechanically and electrically designed only for mating with that specific header.

How are the four microphones electrically isolated on STEVAL-MIC002V1?

Each microphone has dedicated CLK, DATA, and L/R lines routed separately to J1 pins, with individual 100 nF decoupling capacitors (C1–C4) placed adjacent to each MP34DT06J VDD pin. Ground planes are partitioned under each microphone to minimize shared-impedance coupling, as confirmed in the DB3614 schematic (page 2).

Is RoHS compliance verified for STEVAL-MIC002V1?

Yes-RoHS compliance is explicitly stated in the official data brief (DB3614, Rev 1, page 1) and confirmed in ST's product change notifications. The board uses lead-free solder, halogen-free laminates, and RoHS-compliant passives and connectors per EU Directive 2011/65/EU.