Peripherals and connectivity for basic system integration
On the peripheral side, the MSP430G2253IPW28R packs a 10-bit ADC with 8 multiplexed channels, plus a brown-out detect, POR, PWM timer, and watchdog timer. The 24 general-purpose I/O pins give enough headroom for a small keypad, LED indicators, and a few external interrupt lines.
Housed in a 28-pin TSSOP (4.40 mm width, 0.65 mm pitch), the MSP430G2253IPW28R is a surface-mount device that sits on a standard 28-TSSOP footprint. MSL level is typical for this package class — check the reel label for exact moisture sensitivity before reflow.