STEVAL-VOICE-UI Amazon qualified Alexa Smart Home evaluation kit is based on STM32H7 MCU

We’ve already covered plenty of Amazon-qualified development kits working with Alexa Voice Services. But here’s another one with STEVAL-VOICE-UI evaluation kit making it to the list of Smart Home Dev Kits, which Amazon describes as “reference designs for creating smart home products such as light switches, thermostats, or Wi-Fi routers”.

STEVAL-VOICE-UI voice user interface (VUI) evaluation kit features an STMicro STM32H7 Arm Cortex-M7 microcontroller with 2 MB embedded flash, 1 MB embedded SRAM, 2.4 GHz Wi-Fi, and a microphone array with three MEMS microphones, as well as a loudspeaker, and some buttons and LEDs.

STEVAL-VOICE-UISTEVAL-VOICE-UI key features specifications:

  • Microcontroller – STMicro STM32H753VIT6E Cortex-M7 MCU @ up to 550 MHz with 2 MB flash, 1 MB SRAM
  • Connectivity – 2.4 GHz Wi-Fi subsystem (Murata 1DX module) coupled to 2MB NOR flash (ISSI IS25LP016D)
  • Audio
    • 3x MP23DB01HP MEMS microphones with 36 and 30 mm spacing
    • FDA903D class D digital input automotive audio amplifier
    • 8 Ohm loudspeaker
  • Misc – 4x RGB LEDs and 4x simple LEDs; joystick, reset, and user push-buttons
  • Dimensions – 65×36 mm

STEVAL-VOICE-UI functional block diagramThe devkit is comprised of two boards, one with STM32H7 MCU and WiFI, and the other with the microphone, audio output, LEDs, and buttons. The speaker is attached on the right side, and STLINK-V3MINI debugger/programmer for STM32 with programming cable, plus a USB A to C connector cable complete the kit.

The software package implements audio front-end, Amazon “Alexa” wake word, audio playback, and Amazon Alexa communication protocol software. The SDK runs on internal memories only for maximum integration. To get started with development, you’ll need a Windows OS (7, 8, and 10), Linux 64-bit, or MacOS computer to run IAR Embedded Workbench EWARM IDE, and a companion app is also available for Android 7+ or iOS 14+ mobile devices.

While I was just be made aware of the evaluation kit this weekend, STMicro announced it last November. Having said it can’t be easily purchased online, and the Amazon page says that “pricing available on request”. More details including a getting started guide, schematics, and the BoM can be found on ST Micro’s website.
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