Cortex-M0 core at 48 MHz — what it means for a small control loop
The STM32F038G6U6 runs an ARM Cortex-M0 core at 48 MHz — enough throughput for sensor polling, PWM generation, and serial communication in a single loop without a scheduler. The 32-bit data path handles 32-bit arithmetic in one cycle, so a PID loop or a simple state machine fits without the overhead of a 16-bit core.
Memory budget: 32 KB flash, 4 KB SRAM
32 KB of on-chip flash (32K x 8) and 4 KB SRAM (4K x 8) set the firmware ceiling. For a motor-control or sensor-hub application, the flash holds the application code plus a bootloader; the SRAM covers the stack, a few ring buffers, and the ADC conversion results. If the firmware exceeds 32 KB, step up to the STM32F038x6 or STM32F042 variants in the same package.
Package and board-fit: 28-UFQFPN (5x5 mm)
Housed in a 28-lead UFQFPN (5x5 mm) — a thin, fine-pitch QFN with an exposed pad.
Peripherals and I/O
22 I/O lines, including a 10-channel 12-bit ADC, two I²C, two SPI, one UART/USART with LIN and IrDA support, plus a PWM timer and a watchdog. The DMA engine moves ADC results to memory without CPU intervention — useful for continuous sensor monitoring. The I²S interface handles audio streaming if needed.