What this part is — MSP430F67481AIPZR
16-bit MCU from the MSP430F6xx series, core runs at 25 MHz. 512 KB Flash and 16 KB RAM.
Where it fits — metering and instrumentation
This MCU is designed for the front end of a polyphase energy meter: the four 24-bit sigma-delta ADCs sample voltage and current channels simultaneously, the LCD driver runs the display directly, and the 512 KB Flash holds the metrology stack plus tariff tables. Communication with a host or concentrator goes over I²C, SPI, UART, or IrDA — no built-in PHY for Ethernet or PLC, so you add an external modem chip for AMI networks.
25 MHz clock drives the 4x24-bit ADC pipeline and LCD refresh. No dedicated display controller needed.
The MSP430F67481AIPZR is marked as end-of-life (EOL). That means the manufacturer has stopped production, and new units are only available through surplus or broker channels. There is no official TI successor listed for this specific variant, so a pin-compatible drop-in replacement is not guaranteed; you'd need to evaluate the wider MSP430F6xx family or consider a redesign if long-term supply is critical.