Texas Instruments MSP430F67791IPEU

Overview

MSP430F67791IPEU from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electronic watt-hour meters. It integrates a 25-MHz MSP430 CPU with 32-bit multiplier, seven 24-bit sigma-delta ADCs, LCD controller (320 segments), and real-time clock with temperature compensation - delivering <0.1% energy measurement accuracy over 2000:1 dynamic range at 40–70 Hz line frequency in utility metering applications.

For engineers reviewing the MSP430F67791IPEU datasheet, MSP430F67791IPEU pinout, MSP430F67791IPEU application, or MSP430F67791IPEU equivalent, key selection criteria include its 512KB flash/32KB RAM configuration, 128-pin LQFP package with 90 GPIOs, compliance with ANSI C12.20 and IEC 62053 standards, ultra-low-power LPM3.5 mode (0.34 µA), and integrated anti-tamper security modules for smart meter deployments.

Technical Context

The MSP430F67791IPEU implements a dedicated metering architecture with seven independent SD24_B sigma-delta modulators supporting differential inputs and programmable gain - enabling simultaneous high-accuracy voltage/current sampling across three phases plus neutral. Its energy calculation engine executes TI's certified energy measurement software library directly on-chip, eliminating external co-processors.

Power management includes dual-domain supply (DVCC/AVCC/VASYS/VDSYS) with automatic switching, auxiliary supplies (AUXVCC1–3) for backup subsystem operation, and hardware-accelerated digital phase correction for current transformers - all operating within –40°C to 85°C industrial temperature range.

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 SoC applications.

Compared with MSP430F67781IPEU and MSP430F67691IPEU, the MSP430F67791IPEU uniquely combines maximum memory (512KB/32KB), full seven-channel SD24_B capability, and neutral-current support - making it the only option in the F677x1 family qualified for full 3-phase 4-wire revenue metering with extended data retention and multi-tariff flexibility.

Availability

MSP430F67791IPEU is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade energy monitoring, and AMI endpoint development requiring stable component supply, long-term lifecycle support, and metrology-certified performance.

Supply support for MSP430F67791IPEU 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 company specializing in analog, embedded processing, and digital signal processing technologies with leadership in low-power microcontrollers and precision metrology solutions.

The MSP430F67791IPEU belongs to TI's polyphase metering SoC product line, engineered specifically for ANSI/IEC-compliant revenue meters - integrating metrology ADCs, secure processing, and display drivers to minimize external components and accelerate certification.

FAQ

What is the primary metrology accuracy specification of the MSP430F67791IPEU?

The MSP430F67791IPEU achieves <0.1% energy measurement accuracy over a 2000:1 dynamic range for phase current, meeting or exceeding ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S standards. This performance is enabled by its seven 24-bit sigma-delta ADCs, digital phase correction, and temperature-compensated reference architecture - all validated under 40–70 Hz line frequency conditions using single-point calibration.

Does the MSP430F67791IPEU support neutral current measurement in 3-phase 4-wire systems?

Yes, the MSP430F67791IPEU supports neutral current measurement via its seventh SD24_B sigma-delta ADC channel (SD6P0/SD6N0). This enables full 3-phase 4-wire star-connected metering per IEC 62053-23, allowing cumulative four-quadrant energy calculation including neutral imbalance - a capability not present in lower-tier variants like MSP430F67691IPEU.

What low-power modes are available on the MSP430F67791IPEU and their typical current draw?

The MSP430F67791IPEU offers multiple low-power modes: Standby (LPM3) draws 2.1 µA at 3 V with fast <5 µs wake-up; RTC mode (LPM3.5) consumes 0.34 µA at 3 V while maintaining calendar/timekeeping; and Shutdown mode (LPM4.5) uses only 0.18 µA at 3 V. These modes sustain critical functions like tamper detection and secure RTC during AC mains failure - essential for uninterrupted meter operation.

How does the MSP430F67791IPEU handle crystal oscillator accuracy for RTC operation?

The MSP430F67791IPEU incorporates a password-protected RTC with crystal offset calibration and temperature compensation. Using the RTCCAP0/RTCCAP1 pins, it dynamically adjusts the 32.768 kHz crystal loading capacitance to maintain ±1 ppm timekeeping accuracy across –40°C to +85°C - eliminating manual calibration and ensuring billing integrity in temperature-varying environments.

Is the MSP430F67791IPEU pin-compatible with other devices in the MSP430F677x1 family?

Yes, the MSP430F67791IPEU shares identical 128-pin LQFP (PEU) packaging and pinout with all MSP430F677x1IPEU variants (e.g., MSP430F67781IPEU, MSP430F67771IPEU). Signal mapping, power domains, and peripheral assignments are fully compatible - enabling hardware reuse across memory- and ADC-channel-graded versions without PCB redesign.