16 MHz, 1 KB Flash, 128 B RAM — the MSP430G2131IPW14R as a BOM fit
The 16 MHz clock, 8-channel 10-bit ADC, and internal oscillator let it handle periodic sensor reads and output actuation without external clock or analog components.
For a design running from two AA cells, the MCU stays operational through the full discharge curve. The 10 general-purpose I/O pins and the serial interfaces (I²C, SPI) remain functional across the voltage range, so no external level shifting is needed for common 3.3 V or 1.8 V sensor buses.
The brown-out detect and POR circuits keep the MCU from corrupting Flash during supply transients in noisy environments.
The ROHS3 compliance is current for global markets.
14-TSSOP package — footprint for space-constrained PCBs
Housed in a 14-pin TSSOP with 0.65 mm pitch, the 4.40 mm body width fits on compact two-layer boards.