25 MHz CPUXV2 core and the dual-ADC advantage
At 25 MHz the CPUXV2 delivers enough throughput for real-time energy calculation loops while keeping power draw low — the MSP430 architecture is known for sub-µA standby currents, though the exact figures depend on the active peripheral configuration. The eight 10-bit ADCs handle auxiliary channels like temperature or tamper detection. The 72 I/O pins give plenty of headroom for driving a segment LCD, reading keypads, and communicating with a host system over I²C or SPI.
Package and footprint notes for the layout engineer
The MSP430F6731IPZR comes in a 100-pin LQFP with a 14x14 mm body (0.5 mm pitch). It is a surface-mount package that reflows with standard lead-free profiles. Supply decoupling should follow the typical 0.1 µF + 1 µF per Vcc pin pair.