The STM32L431RBY6TR is a high-performance, ultra-low-power ARM Cortex-M4 microcontroller with Floating Point Unit (FPU) from STMicroelectronics. It is a member of the STM32L4A family and incorporates 128 Kbytes of Flash memory, 80 MHz max CPU frequency, and an extensive range of peripherals allowing for advanced control and connectivity in various embedded applications. This MCU includes one 12-bit ADC and two 12-bit DACs, plus a hardware Crypto Accelerator with AES-128 and true random number generator (TRNG). It includes voltage range from 1.62–3.6 V and offers up to 5 wait states for Flash memory in order to achieve maximum frequency performance. The STM32L431RBY6TR supports both static and dynamic voltage scaling, real-time Ethernet, as well as a variety of communication protocols, including CAN, I2C, UART, SPI, USB 2.0, and Ethernet. It is suitable for various industrial-grade low-power applications, such as motor control, home appliances, and industrial automation.