80 MHz Cortex-M4 with FPU in a 32-pin LQFP
The STM32L412K8T6 is a 32-bit single-core ARM Cortex-M4 MCU from the STM32L4 ultra-low-power series, clocked at 80 MHz. The FPU handles single-precision float operations in hardware — sensor fusion or motor-control math that would stall a Cortex-M3 runs here without a software emulation penalty. With 64 KB of flash and 40 KB of SRAM, the memory map leaves room for a lightweight RTOS (FreeRTOS or similar) plus the application heap and stack. The 40 KB RAM is split across SRAM1, SRAM2, and a small backup domain — the datasheet's memory map on page 7 shows which regions are retained in standby.
Memory and peripheral headroom for sensor-heavy designs
The 10-channel 12-bit ADC samples at up to 5 Msps in interleaved mode — enough for simultaneous three-phase current sensing or a bank of analog sensors. The Quad SPI interface maps external flash or RAM into the memory space, extending storage without consuming extra GPIO. Connectivity includes USB (with on-chip PHY), two I²C, two SPI, three UART/USART, and an infrared interface. The 26 I/O lines in the 32-LQFP package mean every pin earns its keep — a design needing more than 26 signals should step up to the 48-pin or 64-pin STM32L412 variants. The internal oscillator trims to 1 % accuracy over temperature — no external crystal needed for UART or I²C bit rates that tolerate that tolerance.
Industrial temperature grade and active lifecycle
The brown-out detect and POR circuits keep the core reset cleanly during supply ramp — no external supervisor required for basic operation. RoHS3 compliant, and the 32-LQFP (7x7 mm) package is a standard low-profile quad flat pack, hand-solderable and inspectable under a microscope.