This Amazon-qualified solution allows the rapid integration of Alexa Voice services into embedded devices. 2022-03-14

This Amazon-qualified solution allows the rapid integration of Alexa Voice services into embedded devices.

It enables end products to deliver enhanced user experience through best-in-class natural language-based voice user interface and additional Amazon AWS based services.

The solution is based on the STM32H7 high-performance MCU, which runs 

  • the audio front end for far-field and noisy environment support
  • local wake word detection
  • full Amazon connectivity stack
  • audio output, and over-the-air-upgrade

with no additional external memory requirements.

The reference design is complemented with high-quality MP23DB MEMS microphone, FDA903D audio amplifier and a Wi-Fi subsystem implemented in bypass mode.

High-performance STM32H7 MCU

This highly integrated MCU has the performance of an ARM Cortex-M7 core and flash capacity to manage high-end cloud-based voice UI functionality, including fast wake word detection, advanced audio front end (AFE), and full connectivity stack on a cost- effective LQFP 100-pin package, without additional peripheral or memory requirements.


Amazon fully qualified software reference design

The qualified software for Amazon AVS for AWS IoT is fully functional and free of charge, except for the evaluation version of the Alexa wake word component, which requires Amazon licensing in a final product.


High quality MP23DB01HP MEMS microphone

The ultra-compact, low-power, omnidirectional, digital MEMS microphone consists of a capacitive sensing element and an IC interface with stereo operation capability. The device has a very high AOP in performance mode, a sensitivity range of ±1 dB and a high SNR for all operating modes



Powerful FDA903D audio amplifier 

This high efficiency 45 W single bridge class-D amplifier with I2S input includes a high-performance D/A converter with performance output MOSFET.


Automotive Infotainment and Telematics

产品型号 描述
FDA903D 1 x 45 W D类数字输入汽车级功率放大器,具有负载电流监测和宽工作电压范围,用于汽车音频和通信应用,裸露底部焊盘

MEMS and Sensors

产品型号 描述
MP23DB01HP MEMS audio sensor multi performance mode digital microphone

Microcontrollers & Microprocessors

产品型号 描述
STM32H743VI 带DSP和DP-FPU的高性能ARM Cortex-M7 MCU,具有2 MB Flash、1 MB RAM、480 MHz CPU、ART加速器、一级缓存、外部存储器接口和大量外设


  • All Features

    • Highly integrated Amazon-qualified AVS for AWS IoT reference design
    • Amazon-qualified acoustic far-field and noisy environment support
    • A two microphone-mems-based advanced audio front end with mics spacing down to 25 mm
    • Maximum integration and cost-effectiveness with <$10 POS BOM in volume

The STEVAL-VOICE-UI reference kit offers a compact and modular hardware reference design supporting local and cloud-based voice user interfaces.

The kit consists of a motherboard with STM32H743 microcontroller and certified Wi-Fi module, and a daughterboard with two high quality MP23DB01HP mems microphones spaced 36 mm apart, and an FDA903D 45W audio amplifier. An 8 Ω speaker completes the design.

Note: The STEVAL-VOICE-UI reference kit is available on request. Please contact ST sales for more details.

All Evaluation Features

    • STM32H743 MCU
      • High-performance Cortex-M7 based MCU running at 480 MHz
      • 2 MB of embedded Flash
      • 1 MB of embedded SRAM
    • Certified Wi-Fi subsystem
      • Advanced 2.4 GHz Wi-Fi radio accessed in bypass mode
      • 2 MB NOR Flash used to store the Wi-Fi low-level PHY and MAC layer code
    • MP23DB01HP MEMS microphones
      • Two high-quality MEMS microphones, 36 mm spaced
    • FDA903D audio amplifier
      • I2S input, 45 W output audio amplifier

    Solution Details:


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