16 MHz MSP430 with 1 KB FRAM — ultra-low-power sensor controller
The MSP430FR2100IRLLR: It runs at 16 MHz and packs 1 KB of FRAM program memory — non-volatile storage that writes at near-SRAM speed with essentially unlimited endurance, unlike Flash. The 512 x 8 RAM handles stack and variable data, while 12 general-purpose I/O lines and an 8-channel 10-bit ADC connect to sensors, switches, and analog inputs.
FRAM program memory — no field-update penalty
The 1 KB FRAM (1K x 8) is the standout feature. Unlike Flash or EEPROM, FRAM writes at bus speed without a page-erase cycle, so the MCU can log data or update firmware in the field with zero write-cycle overhead. For a battery-powered sensor that must store readings every few seconds, this saves microamps compared to a Flash part that would need a charge pump for each write. The 512 x 8 RAM is modest — enough for a small control loop or state machine, but tight for buffering large packets. Plan your stack and variable footprint accordingly.
24-VQFN package — rework considerations
The 24-VQFN (3x3 mm) with exposed thermal pad is a compact package that saves board space but needs a careful rework profile. The pad under the QFN sinks heat fast — a standard hot-air station with a fine nozzle will lift the part clean if you preheat the board first.