Packaged in a 32-VQFN (4x4 mm) with 28 I/O lines, it integrates an 8-channel 12-bit SAR ADC, internal oscillator, and serial interfaces including I²C, SPI, and UART.
FRAM endurance — no wear-leveling tax on the firmware
Unlike Flash-based MCUs where a 100k-cycle sector limit forces wear-leveling in the OTA staging area, FRAM handles write-after-write without erase cycles. For a data-logging endpoint that stores a 16-byte record every minute, the 16 KB FRAM outlives the product's service life without a dedicated filesystem layer.
Package and footprint — 32-VQFN rework notes
The 32-VQFN (4x4 mm) with exposed pad needs a stencil aperture that covers the thermal pad — a common rework miss is under-printing the pad, which lifts the die temperature 15°C above the junction limit at 105°C ambient.