Polyphase metering SoC with seven 24-bit sigma-delta ADCs
The Texas Instruments MSP430F6779IPZ is a 16-bit mixed-signal MCU built around the MSP430 CPUXV2 core running at 25 MHz. Its defining feature is the array of seven 24-bit sigma-delta ADCs — this is a metrology system-on-chip, not a general-purpose microcontroller. With 512 KB of Flash and 32 KB of SRAM, it carries enough firmware and data memory for a full polyphase energy-metering profile including communication stacks over I²C, SPI, UART/USART, or LINbus. The 62 GPIOs and on-chip LCD driver let it connect directly to a segmented-glass display and push-button interface without external port expanders.
What the ADC count and resolution mean for the BOM
Seven independent 24-bit sigma-delta converters map directly to a three-phase four-wire meter with neutral-current sensing — one ADC per voltage and current phase plus a spare channel for tamper detection or temperature compensation. The 8x10b SAR ADC handles auxiliary inputs like zero-crossing or line-frequency measurement. This integration eliminates the need for an external metrology AFE or multiple discrete ADCs, shrinking the bill of materials and the calibration effort.