The STM32L431CCU6TR is an ARM microcontroller unit manufactured by STMicroelectronics. It has an ultra-low-power ARM Cortex-M4 Core running at up to 80 MHz with 256 Kbytes of Flash memory and a Floating Point Unit (FPU). The device runs on STM32L43x ultra-low-power microcontrollers, featuring a rich analog and digital peripheral feature set, ultra-low-power consumption, and a 100-pin package. It has two operating modes: sleep mode and low-power run mode. It is ideal for applications requiring medium-performance and low-power consumption. It also has an on-chip low-energy-dissipation real-time clock for fast wake-up, an 8/16-bit general-purpose timer for timer and pulse-width modulation control, a 12-bit ADC for analog-to-digital conversion, touch sensing, various communication interfaces including UART, I2C, and SPI, and Type-C and USB OTG for communication with various external I/O modules. The STM32L431CCU6TR ARM microcontroller unit is an excellent choice for applications requiring medium-performance and low-power consumption such as automotive and medical equipment, industrial IoT, and home appliances.