Texas Instruments MSP430F67791IPEUR

Overview

MSP430F67791IPEUR from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electronic watt-hour meters. It integrates seven 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 512KB flash/32KB RAM, LCD controller (320 segments), and dedicated pulse outputs for active/reactive energy calibration - enabling <0.1% accuracy over 2000:1 dynamic range per phase in ANSI C12.20- and IEC 62053-compliant utility metering systems.

For engineers reviewing the MSP430F67791IPEUR datasheet, MSP430F67791IPEUR pinout, MSP430F67791IPEUR application, or MSP430F67791IPEUR equivalent, key selection criteria include its 128-pin LQFP package with 90 GPIOs, ultra-low-power LPM3.5 mode (0.34 µA), SD24_B converter performance, RTC with crystal offset calibration, and support for CT/Rogowski/shunt current sensors in 3-phase 4-wire star topologies.

Technical Context

The MSP430F67791IPEUR implements a dedicated metering subsystem with seven independent SD24_B sigma-delta modulators - six for phase/neutral current sensing and one for voltage reference monitoring - all synchronized to a common clock and supporting digital phase correction. Its CPU executes TI's energy measurement software library to compute cumulative and per-phase active/reactive/apparent energy, four-quadrant power, and exact phase angle, meeting ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S requirements without external calibration components.

Power management includes dual auxiliary supplies (AUXVCC1–AUXVCC3) for backup subsystem operation during AC mains failure, enabling 3 µA LCD operation in LPM3 and retention of critical metering data. The device supports flexible clocking via 32.768-kHz crystal (XT1), internal VLO, REFO, and DCO, with automatic switching between main and backup power domains.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar polyphase metering applications.

Compared with MSP430F67781IPEUR and MSP430F67691IPEUR, the MSP430F67791IPEUR uniquely provides full 3-phase 4-wire metrology capability with 32 KB RAM for extended secure logging, making it the only option among the three qualified for ANSI C12.20 Class 0.2 compliance in neutral-inclusive configurations.

Availability

MSP430F67791IPEUR is available at Aetrix Electronics and suitable for smart utility metering, industrial energy audit systems, and grid-edge sensor deployments requiring stable component supply, long lifecycle support, and traceable sourcing for safety-critical infrastructure.

Supply support for MSP430F67791IPEUR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in precision metrology and ultra-low-power design.

The MSP430F677x1 product line was engineered specifically for revenue-grade polyphase electricity meters, integrating metrology-grade ADCs, tamper-resistant security, and ultra-low-power RTC to eliminate external components and accelerate certification to ANSI/IEC standards.

FAQ

What is the maximum dynamic range accuracy guaranteed for MSP430F67791IPEUR in polyphase current measurement?

The MSP430F67791IPEUR guarantees <0.1% accuracy over a 2000:1 dynamic range for phase current measurement, as validated per ANSI C12.20 and IEC 62053-22 standards. This performance is achieved using its seven 24-bit SD24_B sigma-delta ADCs with programmable gain, digital phase correction, and temperature compensation - all implemented within the MSP430F67791IPEUR silicon without external calibration hardware.

Does MSP430F67791IPEUR support direct connection to Rogowski coils without external signal conditioning?

Yes, the MSP430F67791IPEUR supports direct interface to Rogowski coils via its SD24_B differential inputs (e.g., SD0P0/SD0N0), which accept low-level AC signals and provide programmable gain up to 128×, integrated high-pass filtering to remove integrator drift, and digital integration in firmware. No external op-amps or integrators are required when using the MSP430F67791IPEUR's built-in signal chain.

How does the MSP430F67791IPEUR handle power loss during metering operations?

The MSP430F67791IPEUR uses three auxiliary supplies (AUXVCC1–AUXVCC3) to maintain RTC, backup RAM, and critical metrology functions during AC mains failure. In LPM3 mode, it draws only 3 µA to sustain LCD operation and timestamped event logging. The MSP430F67791IPEUR automatically switches to battery backup within microseconds, preserving energy registers and tamper logs without data loss.

What communication interfaces are available on MSP430F67791IPEUR for AMI system integration?

The MSP430F67791IPEUR provides six enhanced universal serial communication interfaces: four eUSCI_A modules configurable as UART or SPI, and two eUSCI_B modules configurable as SPI or I²C. This allows concurrent connections to PLC modems (SPI), optical ports (UART), RF transceivers (SPI), and sensor hubs (I²C) - all managed independently by the MSP430F67791IPEUR without external protocol bridges.

Is the MSP430F67791IPEUR pin-compatible with other devices in the F677x1 family?

Yes, all MSP430F677x1 devices in the 128-pin LQFP (PEU) package - including MSP430F67791IPEUR, MSP430F67781IPEUR, and MSP430F67771IPEUR - share identical pinouts and footprint. Firmware and PCB designs can be reused across variants; differentiation is limited to flash/RAM size and SD24_B channel count - parameters verified in the MSP430F67791IPEUR datasheet revision SLAS815D.