The 48-VQFN package (7x7 mm) exposes 31 I/O lines and includes a 10-bit ADC with 8 channels, plus on-chip brown-out detect, POR, DMA, PWM, and a watchdog timer.
Flash and RAM budget — sizing the firmware envelope
The 24 KB Flash (24K x 8) is the program store; combined with 6K x 8 of RAM, this part targets control and data-logging applications that don't need large lookup tables or complex RTOS stacks. The USB stack and a moderate application loop fit comfortably, but buyers should verify the firmware image fits before committing the BOM — especially if using the USB CDC or HID stacks, which can consume 4–6 KB of Flash alone.