The STM32L433CCU3: The 48-UFQFPN package with exposed pad (7x7 mm) keeps the footprint tight while the thermal pad helps pull heat from the core during sustained processing. On-chip peripherals include a segment LCD driver, DMA, multiple PWMs, and a watchdog timer — enough to handle a mixed-signal control board without an external display controller or extra glue logic.
The 64 KB SRAM supports two 8 KB buffers and a 16 KB RTOS heap with room for DMA descriptors. Compared to the earlier STM32L1 series (32 MHz Cortex-M3), this part roughly doubles the arithmetic throughput per clock and adds DSP instructions.
The STM32L433CCU3 brings CANbus, USB, QSPI, SAI (audio), and multiple I²C/SPI/UART interfaces, plus an integrated LCD driver that supports up to 8x40 segments. Brown-out detection and a programmable watchdog are built in, so a supervisory reset IC is optional — the MCU can self-reset on a droopy rail. DMA offloads data movement, keeping the core free for control code.
The STM32L4 series is a mainstream portfolio at ST, so PCNs are infrequent and second-source options within the series exist (e.g., variants with different memory or package).