Polyphase metering MCU with dual sigma-delta ADC
The Texas Instruments MSP430F6733IPNR is a 16-bit MSP430 CPUXV2 microcontroller clocked at 25 MHz, with 64 KB Flash and 4 KB RAM. Its distinguishing feature is the three 24-bit sigma-delta analog-to-digital converters alongside five 10-bit ADCs — a combination aimed squarely at polyphase energy metering, power-quality monitoring, and precision industrial measurement where simultaneous sampling of voltage and current channels is required. The 52 GPIOs and peripheral set including I²C, SPI, UART, IrDA, LIN, and an integrated LCD driver give it the connectivity to talk to metrology AFEs, communication modules, and local displays without external glue logic.
24-bit sigma-delta ADC — what it means for the measurement chain
Three 24-bit sigma-delta ADCs on one die let this part capture voltage and current from each phase of a three-phase system simultaneously, with the digital processing staying inside the MCU. That eliminates the need for a separate metrology AFE chip in many designs — the MSP430F6733IPNR handles both the analog front-end and the computation. The 5x10-bit ADCs are available for auxiliary channels like temperature sensing or neutral-current monitoring. For a BOM engineer, this integration collapses a multi-chip metrology chain into a single 80-LQFP package, saving board area and reducing procurement complexity.
Industrial temperature and package
Rated for -40°C to 85°C, this MCU operates in outdoor utility enclosures and factory-floor instrumentation.