80 MHz Cortex-M4 with DSP and FPU
The STM32L412C8T6: Built around an ARM Cortex-M4 core running at 80 MHz, this MCU includes a single-precision floating-point unit and DSP instructions. The 80 MHz clock rate sets the throughput ceiling for real-time control loops and signal processing — a sensor fusion algorithm or motor-control FOC loop runs without a separate DSP. The 64 KB on-chip Flash and 40 KB SRAM leave headroom for a typical sensor-node firmware stack (RTOS, HAL, application code) without external memory. The 40 KB SRAM is enough to buffer several seconds of audio or a full frame of image data from a low-resolution camera.
Supply range and connectivity for battery-powered nodes
The internal oscillator and brown-out detect keep the system stable across the full range. Connectivity includes I²C, SPI, Quad SPI, USART/UART, and USB — enough to interface with external sensors, displays, wireless modules, or a host PC. The 10-channel 12-bit ADC samples analog inputs (temperature, pressure, battery voltage) without an external converter. The internal DMA can move ADC results directly to SRAM, keeping the CPU free for control tasks.
48-LQFP — board-fit and rework
The internal oscillator and brown-out reset are rated across this range.