Polyphase metering MCU with six 24-bit sigma-delta ADCs
Its defining feature is the six 24-bit sigma-delta converters — this part is purpose-designed for polyphase energy metering, where simultaneous voltage and current sampling on multiple phases is required.
What the peripheral set means for the BOM
The six 24-bit sigma-delta ADCs eliminate the need for an external analog front-end in multi-phase metering — that saves board space and BOM cost. The integrated LCD driver can run a local display directly, and the 62 I/O pins handle tamper detection, relay control, and optical probe interfaces without a port expander. Connectivity includes I²C, SPI, UART, IrDA, and LINbus, which covers the common meter-bus and utility communication protocols.
Package and rework considerations
The 100-pin LQFP in a 14x14 mm body is a standard gull-wing package with a 0.5 mm pitch. The exposed pad is absent on this package variant, so all heat goes through the leads; the junction stays within limits as long as the ambient stays under 85°C. A hot-air station can lift this part cleanly without cooking adjacent components if you preheat the board to 100°C first.
Supply voltage and power budget
In a typical metering application the core draws well under 1 mA at 25 MHz with the ADCs active, so a primary battery can last the meter's 10-year service life. The brown-out detect and POR are on-chip, so no external supervisor is needed.
Lifecycle and supply posture
For dual-sourcing resilience, the higher-density MSP430F6779IPZ shares the same 100-LQFP footprint and peripheral set, though its Flash and RAM differ.