Memory map and peripheral set — what fits and what doesn't
The 32 KB Flash (32K x 8) is sized for compact firmware images — think a single-threaded sensor readout loop with a BLE stack or a simple motor-control algorithm. The 8 KB SRAM (8K x 8) supports moderate data buffers; if your application needs a large frame buffer or a real-time OS with multiple stacks, you'll bump against the ceiling. The 1 KB EEPROM (1K x 8) is a differentiator: it stores calibration constants, node IDs, and fault logs without wearing the Flash or adding an external part.
25 I/O in a 5x5 mm exposed-pad package
With 25 I/O lines in a 32-UFQFN package measuring 5x5 mm (exposed pad), this part fits on cramped PCBs for wearables, smart sensors, and compact control modules.