16-bit metering MCU with integrated sigma-delta ADC and LCD drive
Connectivity covers I²C, IrDA, LINbus, SPI, and UART/USART.
What the 7x24-bit sigma-delta ADC and LCD driver mean for the BOM
The seven 24-bit sigma-delta converters are the defining feature of this part. They allow simultaneous sampling of multiple voltage and current channels, which is exactly what polyphase energy metering requires — each phase gets its own dedicated converter, eliminating the need for external analog multiplexing and the timing errors it introduces. The integrated LCD driver further reduces BOM count by driving the display directly. For a design targeting a three-phase smart meter or a multi-channel data acquisition front end, this MCU collapses what would otherwise be an analog front-end chip plus a separate LCD controller into a single 100-pin package.
The MSP430F67781IPZR is listed as obsolete. For a production BOM line that depends on this exact part, the channel is now independent distribution — surplus, new-old-stock, and broker-sourced inventory. Date-code provenance matters here: stock surfacing well after the last-time-buy window should be verified for authenticity and moisture sensitivity. The 100-LQFP package is MSL 3, so any parts that have been out of the sealed bag past the floor-life window need a bake before reflow.
Footprint and supply rails
With 62 I/O available, most of the package pins are brought out, so a layout review against the pin assignments in the datasheet is essential before committing the PCB.