Polyphase metering MCU with six 24-bit sigma-delta ADCs
The standout feature is the six independent 24-bit sigma-delta analog-to-digital converters—designed for polyphase energy metering where simultaneous voltage and current channel sampling is required. An integrated LCD driver supports segment displays directly, cutting the external display controller. The 128-pin LQFP package (20×14 mm body) gives access to 90 general-purpose I/O lines.
What the six 24-bit sigma-delta converters mean for the BOM
The 6x24b sigma-delta ADC block is the reason you pick this part over a general-purpose MSP430. Each converter runs simultaneously, so a three-phase-plus-neutral meter reads all voltage and current channels without multiplexing delay. The 24-bit resolution gives the dynamic range to measure shunt-resistor drops at light load and still resolve fault currents—no external PGA needed. The LCD driver saves a segment-driver IC and the associated board space. If your application does not need polyphase metering or a display, a smaller MSP430F6xx variant with fewer ADC channels and a smaller package (e.g., 100-pin LQFP) will cost less and simplify layout.
Package and footprint notes
The 128-LQFP package (20×14 mm body, 0.5 mm pitch) is a common footprint shared across the MSP430F6xx family. The exposed thermal pad on the underside requires a via-stitched ground plane for adequate heat dissipation—without it, the junction temperature rises quickly above 400 mA continuous I/O load.