Metering-focused 16-bit MCU with seven sigma-delta ADCs
The MSP430F67771IPEUR: Seven 24-bit sigma-delta ADCs enable simultaneous voltage and current sensing on multiple phases.
25 MHz CPUXV2 core — throughput for real-time metrology
The 25 MHz clock rate on the MSP430 CPUXV2 core is enough to handle the computational load of seven simultaneous 24-bit sigma-delta conversions, digital filtering, and energy accumulation without dropping samples. The CPUXV2 is a 16-bit RISC architecture with a hardware multiplier, so metrology algorithms like active/reactive power and RMS calculations run in a deterministic number of cycles. For a three-phase meter reading voltage and current on each phase plus neutral, the 25 MHz headroom means the firmware can complete the DSP chain within the line-cycle window.
Seven 24-bit sigma-delta ADCs — the metrology engine
Seven 24-bit sigma-delta converters sample voltage and current channels simultaneously for polyphase energy meters.
For a procurement team qualifying this part into a new meter design, there is no imminent supply discontinuity. The base product number MSP430F67771 covers a range of Flash and RAM options in the same 128-LQFP footprint, so if a future firmware revision needs more memory, a pin-compatible migration within the family is possible without a board spin.