Texas Instruments MSP430F67791AIPZR

Overview

MSP430F67791AIPZR from Texas Instruments is a polyphase metering SoC designed for high-accuracy 3-phase energy measurement in utility smart meters. It integrates seven independent 24-bit sigma-delta ADCs (±0.1% accuracy over 2000:1 dynamic range), a 25-MHz CPU with 32-bit multiplier, 512KB flash/32KB RAM, LCD controller (320 segments), and dual eUSCI modules supporting UART/I²C/SPI - enabling full ANSI C12.20 and IEC 62053 compliance in a single-chip solution.

For engineers reviewing the MSP430F67791AIPZR datasheet, MSP430F67791AIPZR pinout, MSP430F67791AIPZR application, or MSP430F67791AIPZR equivalent, this device delivers verified metrology-grade performance for 3-phase 4-wire star-connected watt-hour meters, real-time tamper detection via password-protected RTC, and ultra-low-power operation (0.34 µA in LPM3.5) during mains failure - critical for battery-backed metering systems requiring long-term data retention and calibration stability.

Technical Context

The MSP430F67791AIPZR implements a dedicated metrology subsystem with seven SD24_B sigma-delta modulators, each configurable for differential current/voltage sensing across three phases plus neutral. Its analog front end supports CT, Rogowski coil, and shunt inputs with digital phase correction and temperature-compensated energy calculation - all executed in hardware-assisted firmware using the Energy Measurement Software Library.

Digital architecture includes three-channel DMA, 16-bit CRC, four Timer_A modules (9 capture/compare registers total), and six eUSCI interfaces (four UART/IrDA/SPI-capable, two SPI/I²C-capable). Power management enables seamless transition between active mode (280 µA/MHz) and multiple low-power modes, including RTC-only operation at 0.34 µA and shutdown at 0.18 µA - optimized for battery backup and rapid wake-up (<5 µs).

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, 0.5 mm pitch. Compatible with standard reflow profiles and industrial PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67791AIPEU, the MSP430F67791AIPZR saves PCB space and assembly cost while delivering identical metrology performance; versus MSP430F67691AIPZ, it adds a seventh sigma-delta channel for mandatory neutral current measurement in ANSI/IEC Class 0.2 installations - making it the only option for full 4-wire compliance.

Availability

MSP430F67791AIPZR is available at Aetrix Electronics and suitable for 3-phase smart electricity meters, revenue-grade utility metering, advanced energy monitoring systems, and grid edge intelligence nodes requiring stable component supply, long lifecycle support, and traceable sourcing for global deployments.

Supply support for MSP430F67791AIPZR 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 over 50 years of innovation in precision analog and ultra-low-power microcontrollers.

The MSP430F67791AIPZR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy energy measurement in smart grid infrastructure - emphasizing metrology integrity, security, and ultra-low-power operation under harsh environmental conditions.

FAQ

What is the primary metrology accuracy specification of the MSP430F67791AIPZR?

The MSP430F67791AIPZR achieves <0.1% accuracy over a 2000:1 dynamic range for phase current measurements, meeting ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S standards. This is enabled by its seven independent 24-bit sigma-delta ADCs with digital phase correction and temperature compensation - all verified in TI's Energy Measurement Design Center calibration workflow for the MSP430F67791AIPZR.

Does the MSP430F67791AIPZR support neutral current measurement?

Yes, the MSP430F67791AIPZR supports neutral current measurement via its seventh sigma-delta ADC channel (SD6P0/SD6N0), enabling full 3-phase 4-wire star topology compliance. This capability is explicitly documented in the SLAS983A datasheet and required for ANSI C12.20 Class 0.2 certification - distinguishing it from variants like the MSP430F67691AIPZ which has only six SD24_B channels.

How does the MSP430F67791AIPZR handle power failure scenarios?

The MSP430F67791AIPZR operates in RTC Mode (LPM3.5) at just 0.34 µA @3 V, allowing backup batteries to sustain timekeeping and critical data retention for >10 years during AC mains failure. Its LCD remains functional at 3 µA in LPM3, and the device wakes in <5 µs to resume metrology - ensuring no energy accumulation gaps occur during outages.

What communication interfaces are integrated into the MSP430F67791AIPZR?

The MSP430F67791AIPZR integrates six enhanced Universal Serial Communication Interfaces: four eUSCI_A modules (configurable as UART, IrDA, or SPI) and two eUSCI_B modules (configurable as SPI or I²C). This allows concurrent use of optical port (UART), PLC modem (SPI), and sensor hub (I²C) - all supported natively by the MSP430F67791AIPZR without external level shifters or protocol converters.

Is the MSP430F67791AIPZR pin-compatible with other devices in the F677x1A family?

Yes, the MSP430F67791AIPZR shares identical pinout and electrical characteristics with other 100-pin PZ-package variants in the F677x1A family (e.g., MSP430F67781AIPZ), differing only in flash/RAM size and ADC count. This allows hardware reuse across meter tiers - for example, upgrading from MSP430F67781AIPZ (16KB RAM) to MSP430F67791AIPZR (32KB RAM) requires no PCB change.