The Texas Instruments MSP430F67641IPZ is a 16-bit MCU from the MSP430F6xx series built around the MSP430 CPUXV2 core running at 25 MHz. It carries 128 KB of Flash program memory and 8 KB of RAM, with a peripheral set including a 3-channel 24-bit sigma-delta ADC, an 8-channel 10-bit SAR ADC, DMA, LCD driver, and a full complement of serial interfaces (I²C, SPI, UART, IrDA). The 100-LQFP package exposes 72 general-purpose I/O lines. Supply range is 1.8 V to 3.6 V, and the operating temperature covers -40°C to 85°C, making it suitable for industrial and energy-metering environments where the three sigma-delta converters handle precision current and voltage sensing.
Three 24-bit sigma-delta ADCs — the metrology anchor
The three independent 24-bit sigma-delta converters are the distinguishing feature of this MSP430F6xx variant. They allow simultaneous sampling of voltage and two current channels in a single-phase energy meter, or three-phase voltage/current in a polyphase design, without external analog front-end components. The on-chip 8x10b SAR ADC handles auxiliary measurements (temperature, neutral current) on the same die.