STMicroelectronics STEVAL-MIC003V1

Overview

STEVAL-MIC003V1 from STMicroelectronics is a daughterboard expansion module hosting four IMP34DT05 top-port digital MEMS microphones, designed for PDM audio capture and interfacing with the X-NUCLEO-CCA02M1 carrier board. It operates from 1.6 V to 3.6 V, delivers 64 dB SNR and −26 dBFS ±3 dB sensitivity, and supports omnidirectional acoustic sensing up to 122.5 dBSPL overload point.

For engineers reviewing the STEVAL-MIC003V1 datasheet, STEVAL-MIC003V1 pinout, STEVAL-MIC003V1 application, or STEVAL-MIC003V1 equivalent, key selection considerations include PDM output compatibility with STM32 audio frameworks, mechanical integration with Nucleo expansion headers, NBW algorithm support for voice activity detection, and RoHS-compliant board-level sourcing for embedded audio prototyping.

Technical Context

The STEVAL-MIC003V1 implements a fixed-function microphone coupon board architecture: each of the four IMP34DT05 devices outputs a synchronous PDM bitstream referenced to a shared external clock (CLK1), with left/right channel selection via L/R1 signal. All microphones share common VDD1 and GND1 rails and require no on-board configuration logic.

It functions exclusively as a hardware extension - not a standalone controller - relying on the host X-NUCLEO-CCA02M1 for clock generation, PDM-to-PCM conversion, and system-level audio processing. No firmware, memory, or digital signal processing resources reside on the STEVAL-MIC003V1 itself.

Key Specifications

Availability

STEVAL-MIC003V1 is available at Aetrix Electronics and suitable for voice interface prototyping, far-field speech recognition development, and multi-microphone NBW (narrow-bandwidth) algorithm validation requiring stable component supply and consistent board-level form factor.

Supply support for STEVAL-MIC003V1 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, specializing in microcontrollers, sensors, power management, and embedded solutions for industrial, automotive, and consumer markets.

The STEVAL-MIC003V1 belongs to ST's STM32 ecosystem evaluation platform family, engineered to accelerate audio subsystem validation and reduce time-to-proof-of-concept for PDM-based voice and acoustic sensing applications.

FAQ

Does STEVAL-MIC003V1 include onboard PDM-to-PCM conversion?

No. The board provides raw PDM bitstreams only. Conversion to PCM must be performed externally - typically by the X-NUCLEO-CCA02M1's integrated audio codec or an STM32 MCU with dedicated PDM demodulator peripheral. No clock divider, FIFO, or digital filter circuitry is present on STEVAL-MIC003V1.

What mechanical interface does STEVAL-MIC003V1 use to connect to X-NUCLEO-CCA02M1?

It uses a standard 6-pin male header (J1, CON6) with pin assignments matching the X-NUCLEO-CCA02M1's microphone expansion connector: VDD1, GND1, CLK1, DATA1, and L/R1. No adapter or cable is required - direct stacking via header-to-receptacle mating.

Can STEVAL-MIC003V1 operate independently without X-NUCLEO-CCA02M1?

No. It lacks power regulation, clock generation, and host interface circuitry. All four IMP34DT05 microphones require externally supplied VDD1, CLK1, and L/R1 signals - functionality provided solely by the X-NUCLEO-CCA02M1 or functionally equivalent carrier board.

Is the IMP34DT05 on STEVAL-MIC003V1 the same as MP34DT01-M?

No. IMP34DT05 is a distinct ST part: it features top-port packaging, 122.5 dBSPL overload point, and −26 dBFS sensitivity. MP34DT01-M is bottom-port, has 120 dBSPL overload, and −26 dBFS sensitivity. Pinout and electrical characteristics differ - they are not interchangeable without layout or firmware adaptation.