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. It carries 256 KB of Flash program memory and 32 KB of RAM. 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. Communication interfaces cover I²C, IrDA, LINbus, SPI, and UART/USART. 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.
Lifecycle and sourcing reality
The MSP430F6777AIPEU is listed as Active in current product status documentation. However, some channel records flag an end-of-life-hot designation, which suggests the part may be approaching a last-time-buy phase. For a BOM freeze or a design entering production, confirm the current LTB schedule with your TI representative or through an RFQ here. No official successor order code is published. We source this part to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
Industrial temperature and 128-LQFP package
Rated for –40 °C to 85 °C. The 128-LQFP (20×14 mm) is a standard fine-pitch surface-mount package.