STMicroelectronics STEVAL-MIC008A

Overview

STEVAL-MIC008A from STMicroelectronics is a dual-channel MEMS microphone daughterboard designed for audio sensor evaluation on STM32H7 Discovery kits (e.g., STM32H735G-DK, STM32H7B3I-DK). It integrates two MP23DB01HPTR digital microphones with 135 dBSPL acoustic overload point, -41 dBFs ±1 dB sensitivity, and dual operation modes (low power and performance) across 1.52–3.6 V supply.

For engineers reviewing the STEVAL-MIC008A datasheet, STEVAL-MIC008A pinout, STEVAL-MIC008A application, or STEVAL-MIC008A equivalent, this board enables rapid validation of PDM audio capture, directional audio preprocessing, and low-power wearable voice interface design using STM32H7's DFSDM peripheral.

Technical Context

The board implements two identical MP23DB01HPTR MEMS microphones in bottom-port configuration, each operating in PDM output mode with dedicated clock (CLK_0) and data (DATA_0/DATIN7) routing to STM32H7 discovery kit headers. Both microphones share a common 3.3 V MIC supply (3V3_MIC_1) and feature configurable detection logic via DETECTn.

It supports hardware-selectable PDM data routing through jumpers SB1–SB4, enabling flexible signal path assignment to STM32H7 DFSDM channels (e.g., DATIN1–DATIN7). The board includes LED indicators (LD1), decoupling capacitors (1 µF, 100 nF), and pull-up/pull-down resistors (1 kΩ, 10 kΩ, 100 Ω) for stable PDM timing and level integrity.

Key Specifications

Availability

STEVAL-MIC008A is available at Aetrix Electronics and suitable for STM32H7-based voice interface development, wearable audio preprocessing, and industrial sound monitoring requiring stable component supply and consistent board-level reference design fidelity.

Supply support for STEVAL-MIC008A 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, delivering microcontrollers, sensors, power ICs, and analog/mixed-signal solutions for industrial, automotive, and consumer applications.

STEVAL-MIC008A belongs to ST's STEVAL (ST Evaluation) platform family, engineered specifically to accelerate audio sensor integration and algorithm validation for STM32 ecosystem users.

FAQ

Is STEVAL-MIC008A compatible with STM32H747I-DISCO?

Yes. The board is explicitly designed as a daughterboard for all STM32H7 Discovery kits, including STM32H747I-DISCO. Its CN1/CN2 connectors match the expansion header layout and pin mapping for PDM clock/data signals (CLK_0, DATA_0, DATIN7) and supply rails (3V3_MIC_1).

What are the jumper settings for dual-microphone PDM capture on STM32H7?

By default, SB1 is closed and SB2–SB4 are open, routing DATA_0 to DATIN7 and enabling dual-microphone capture via DFSDM channel 7 and an adjacent channel (e.g., DATIN2). Full configuration options are documented in schematic Figure 1 and DB4959 section "Board versions".

Does STEVAL-MIC008A include biasing or level-shifting circuitry for PDM signals?

Yes. The board incorporates 1 kΩ pull-up resistors (R3, R6) on DATA_0 and DATIN7 lines, 100 Ω series resistors (R4) for impedance matching, and 1 µF/100 nF decoupling (C1, C2, C4, C7) to ensure clean PDM timing and noise immunity when interfacing with STM32H7 DFSDM inputs.

Can STEVAL-MIC008A be used without an STM32H7 Discovery kit?

No - it is a daughterboard only, lacking onboard MCU, power regulation, or USB interface. It requires mating with an STM32H7 Discovery kit (e.g., STM32H735G-DK) to provide clock generation, PDM demodulation, and host connectivity; no standalone operation is supported.