Polyphase metrology MCU with seven 24-bit sigma-delta ADCs
The Texas Instruments MSP430F6777AIPEU is a 16-bit MSP430 CPUXV2 microcontroller in the MSP430F6xx series, clocked at 25 MHz. The standout feature is the integrated 7×24-bit sigma-delta ADC array — this is a metrology-grade measurement front end designed for polyphase energy meters, power-quality monitors, and multi-channel industrial sensor acquisition. Supporting peripherals include an 8×10-bit auxiliary ADC, a DMA controller, an LCD driver, a brown-out detect/reset circuit, a POR, a PWM, and a watchdog timer. The device operates from 1.8 V to 3.6 V over the industrial temperature range of –40 °C to 85 °C, and is supplied in a 128-LQFP package (20×14 mm).
What the 7×24-bit sigma-delta converter means for your design
Seven simultaneous 24-bit sigma-delta channels let this single MCU handle three-phase voltage and current sensing plus neutral — no external ADC or analog front-end chip needed. The 24-bit resolution gives the dynamic range to resolve small load currents alongside full-scale line inputs without gain switching. For a polyphase meter, that means one BOM line replaces a multi-chip metrology AFE plus a separate MCU. The 8×10-bit auxiliary ADC handles the temperature sensor or tamper-detection channel without stealing a sigma-delta channel.
However, some channel records flag an end-of-life-hot designation, which suggests the part may be approaching a last-time-buy phase. No official successor order code is published.
Industrial temperature and 128-LQFP package
The 128-LQFP (20×14 mm) is a standard fine-pitch surface-mount package.