What the 7x24b sigma-delta ADC means for the BOM
The seven 24-bit sigma-delta converters let this single MCU handle three-phase voltage and current sensing plus neutral or auxiliary channels without an external AFE or multiple ADCs. For a three-phase meter design, that saves the cost of a separate metrology SoC or a multichannel ADC — the MSP430F6776AIPEU does the analog front-end and the computation in one package. The 8x10-bit auxiliary ADC handles temperature or tamper-detect inputs.
The 128-pin LQFP (20×14 mm body) is a hand-solderable package, which helps in prototype rework and low-volume production.
That means no last-time-buy scramble for new designs.