Six 24-bit sigma-delta ADCs — the metrology core
The MSP430F6768IPEUR: Its defining feature is the six-channel 24-bit sigma-delta converter array, which simultaneously samples voltage and current on three phases plus neutral — no external AFE needed.
Program memory at 512 KB is generous for a 16-bit MCU; it holds the metrology algorithm, calibration tables, and a communication stack (I²C, SPI, UART, LIN) without code thrashing. The 16 KB RAM supports multi-tap energy accumulation and buffered data for the LCD. Brown-out detect and POR are integrated, so the supply supervisor is internal.
Obsolete — sourcing strategy for the BOM line
Texas Instruments lists the MSP430F6768IPEUR as obsolete. For a production BOM that depends on this part, the only channel is independent distribution — surplus, new-old-stock, or broker inventory. If you have an active build, qualify a replacement or secure a lifetime buy lot now — the open-market supply of this 128-pin LQFP metrology MCU will only tighten.
90 I/O and 128-LQFP — board integration
The 128-LQFP package (20x14 mm body) brings out 90 general-purpose I/O pins, enough to drive a segment LCD directly, read pushbuttons, and manage isolated serial links.