16 MHz MSP430 core in a 14-pin TSSOP — the BOM-fit tier for low-power sensing
The MSP430G2202IPW14R: It runs at 16MHz with 2KB of Flash program memory and 256 bytes of RAM, supplied from 1.8V to 3.6V — a single coin cell or a 3.3V rail both work without a secondary regulator. The 14-TSSOP package gives you 10 general-purpose I/O lines, plus on-chip peripherals including a brown-out detect, POR, PWM, WDT, and a USI module that handles I²C and SPI.
2 KB Flash, 256 B RAM — sizing the firmware envelope
With 2KB of Flash and 256 bytes of RAM, this MCU is sized for a single control loop or a simple state machine. The 256 x 8 RAM is the hard limit for stack and variable storage.