Energy metering MCU with integrated dual sigma-delta ADC
The Texas Instruments MSP430FE4242IPMR is a 16-bit microcontroller from the MSP430x4xx series, designed for single-phase energy metering. Its dual 16-bit sigma-delta ADC samples voltage and current simultaneously for accurate power calculation.
12 KB Flash + 512 B RAM — memory budget for metrology firmware
The 12 KB Flash holds the metrology library, calibration constants, and communication stack. The 512 B RAM is tight but workable for a single-phase meter: it stores instantaneous power values, accumulated energy registers, and a small UART buffer. If the application adds data logging or advanced tamper detection, consider moving to a higher-density sibling in the MSP430FE42x family. The Flash is in-system programmable via SPI or UART, supporting field firmware updates.
Dual 16-bit sigma-delta ADC — the energy measurement engine
The two 16-bit sigma-delta ADCs sample voltage and current simultaneously, eliminating phase error. This supports active-power computation with digital offset and gain correction. The differential ADC inputs accept signals from current transformers or shunt resistors.