80 MHz Cortex-M4 with 512 KB Flash in a 3.36×3.66 mm WLCSP
The STM32L452REY6PTR: Connectivity covers CANbus, I²C, SPI, UART/USART, USB, QSPI, and SAI — enough for industrial fieldbus bridging or audio codec interfaces. The 52 I/O lines and 16-channel 12-bit ADC give it the analog front-end reach for multi-sensor acquisition.
The 160 KB SRAM leaves headroom for double-buffered ADC data and a modest RTOS heap. If your algorithm needs floating-point throughput, the M4 FPU is there; if it doesn't, the 80 MHz still beats a Cortex-M3 at the same clock on integer tasks.
The internal oscillator and brown-out detect keep it running through supply dips without an external supervisor.