STMicroelectronics X-NUCLEO-AMICAM1

Overview

X-NUCLEO-AMICAM1 from STMicroelectronics is an analog MEMS microphone expansion board for STM32 Nucleo platforms, integrating three MP23ABS1 microphones, TSV91x op-amps for signal conditioning, an AD1974 external ADC, and direct routing to STM32's embedded ADC-enabling synchronized acquisition of up to 4 microphones at 192 kHz sampling rate for audio algorithm development and beamforming prototyping.

For engineers reviewing the X-NUCLEO-AMICAM1 datasheet, X-NUCLEO-AMICAM1 pinout, X-NUCLEO-AMICAM1 application, or X-NUCLEO-AMICAM1 equivalent, key selection factors include supported microphone count (3 on-board + 1 via coupon slot), dual-path ADC architecture (external AD1974 + internal STM32 ADC), I2S/USB streaming capability, and compatibility with ST morpho and Arduino UNO R3 headers.

Technical Context

The board implements a dual-acquisition path: three MP23ABS1 microphones feed into TSV914 op-amp stages before multiplexing into the AD1974 4-channel audio ADC (I2S output), while a fourth microphone connects directly to the STM32's ADC via TSV912 amplifier and anti-aliasing filters (HP: 2.8 Hz, LP: 99.4 kHz). Clocking is managed via MCLK, I2S_CK, I2S_WS, and I2S_SD signals routed to the Nucleo host.

Signal integrity is maintained through dedicated analog power domains (AVDD1–AVDD4, A2V5), separate AGND/DGND planes, and ESD protection (USBLC6-2SC6U3). The board supports both SPI (for ADC control) and I2S (for audio data streaming), with USB FS interface enabled via OTG_FS_DP/DM lines for real-time audio capture and streaming.

Key Specifications

Availability

X-NUCLEO-AMICAM1 is available at Aetrix Electronics and suitable for audio algorithm prototyping, voice-controlled IoT edge devices, and multi-microphone beamforming systems requiring stable component supply and rapid evaluation platform access.

Supply support for X-NUCLEO-AMICAM1 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, designing and manufacturing microcontrollers, sensors, power ICs, and development tools for industrial, automotive, and consumer applications.

X-NUCLEO-AMICAM1 belongs to ST's X-NUCLEO expansion board family, engineered specifically to accelerate audio sensing and processing development on STM32 Nucleo platforms with plug-and-play analog microphone interfaces.

FAQ

Does X-NUCLEO-AMICAM1 require external power or draw solely from the Nucleo board?

No external power supply is required: the board is powered entirely via the STM32 Nucleo board's 5 V (VBUS) and 3.3 V rails. On-board LDOs (LDK130M-R) generate clean 3.0 V and 2.5 V analog supplies, while USB power is conditioned for the USB transceiver and ADC reference domains.

Can all four microphones operate simultaneously at 192 kHz?

Yes - the AD1974 external ADC supports simultaneous sampling of up to four channels at 192 kHz in I2S mode. The fourth channel is sourced either from the on-board third microphone (via multiplexing) or from a coupon board plugged into one of the five slots, enabling true 4-mic synchronized capture.

Is firmware provided for USB audio streaming?

Yes - ST provides a free, comprehensive firmware library within STM32Cube, including a ready-to-run audio capture and USB streaming sample application that configures I2S, DMA, and USB CDC ACM class to deliver real-time PCM data to a PC as a standard USB audio device.

What is the role of the TSV912 op-amp in the internal ADC path?

The TSV912 conditions the signal from the fourth microphone (M5) before feeding it to the STM32's ADC: it provides gain, DC biasing, and active filtering (2.8 Hz HP + 99.4 kHz LP), ensuring full-scale utilization and aliasing suppression without requiring external passive components.