The STM32L431RBT6: ARM Cortex-M4 core runs at 80 MHz with DSP instructions and single-cycle MAC. 128 KB Flash and 64K x 8 RAM support an RTOS, communications, and control loop.
Connectivity and peripherals — industrial and audio-ready
The brown-out detect and reset block keeps the core from running on a marginal supply, which matters for battery-powered gear where the rail sags under load.
The base product number STM32L431 is a mainstream STM32L4 variant, so the supply chain is mature and the part is widely stocked across distribution.