Core compute and memory headroom
The STM32L431CBT6 is an ARM Cortex-M4 core running at 80 MHz — the 32-bit single-core pipeline delivers the throughput needed for real-time control loops and sensor fusion without an external DSP. Program memory is 128 KB of Flash (128K x 8), backed by 64 KB of SRAM (64K x 8). That memory map supports moderate firmware images with a few hundred KB of data buffers — enough for a CANopen node or a multi-sensor data logger.
Peripheral set for mixed-signal and fieldbus integration
39 general-purpose I/O lines in the 48-LQFP package leave enough pins for a keypad, status LEDs, and a few external interrupts alongside the serial buses.