Texas Instruments MSP430F67691AIPEU

Overview

MSP430F67691AIPEU from Texas Instruments is a polyphase metering SoC designed for high-accuracy energy measurement in 3-phase utility meters. It integrates six 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 512KB flash, 32KB RAM, LCD controller (320 segments), and multiple communication interfaces (4× UART/IrDA/SPI, 2× I²C/SPI). It meets ANSI C12.20 and IEC 62053 standards and supports shunt/CT/Rogowski sensor inputs.

For engineers reviewing the MSP430F67691AIPEU datasheet, MSP430F67691AIPEU pinout, MSP430F67691AIPEU application, or MSP430F67691AIPEU equivalent, key selection criteria include metrology accuracy (<0.1% over 2000:1 dynamic range), RTC tamper detection, ultra-low-power LPM3.5 mode (0.34 µA), SD24_B channel count, and 128-pin LQFP package compatibility with EVM430-F6779 evaluation hardware.

Technical Context

The MSP430F67691AIPEU implements a dedicated metrology subsystem with six independent SD24_B sigma-delta modulators-each supporting differential inputs, programmable gain, and digital phase correction-enabling simultaneous voltage/current sampling across three phases plus neutral. Its real-time calculation engine executes TI's Energy Measurement Library to derive active/reactive power, energy, RMS, and phase angle without host CPU intervention.

Digital integration includes three-channel DMA, 16-bit CRC, four Timer_A modules (9 capture/compare registers total), and six eUSCI peripherals (four UART-capable, two I²C/SPI-capable). Power management supports automatic supply switching between AC mains and backup battery, with LCD operation at 3 µA in LPM3 during outage.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch, 90 GPIOs including dedicated metrology analog inputs, pulse outputs, and LCD segment/common drivers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67691AIPZ, the MSP430F67691AIPEU provides 28 additional GPIOs and three extra SD24_B differential input pairs - critical for full 3-phase + neutral designs with independent voltage/current sensing per leg. Against MSP430F67791AIPEU, it trades one SD24_B channel for identical system integration and lower unit cost.

Availability

MSP430F67691AIPEU is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade submetering, and AMI endpoint deployments requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F67691AIPEU 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.

The MSP430F67691AIPEU belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy, ultra-low-power energy measurement in utility-grade smart meters and grid-edge monitoring systems.

FAQ

What is the primary metrology capability of the MSP430F67691AIPEU?

The MSP430F67691AIPEU integrates six independent 24-bit sigma-delta ADCs (SD24_B) optimized for polyphase energy measurement. It achieves <0.1% accuracy over a 2000:1 dynamic range per phase current and supports digital phase correction for current transformers - all validated against ANSI C12.20 and IEC 62053 standards. The MSP430F67691AIPEU executes TI's Energy Measurement Library to compute active/reactive energy, RMS, and power factor in real time.

Does the MSP430F67691AIPEU support tamper detection and secure timekeeping?

Yes. The MSP430F67691AIPEU includes a password-protected real-time clock (RTC) with integrated tamper detection logic that monitors voltage, temperature, and case intrusion events. It also features crystal offset calibration and temperature compensation to maintain ±2 ppm accuracy across –40°C to 85°C. These capabilities are essential for revenue-grade metering where time integrity and anti-tamper compliance are mandated.

How does the MSP430F67691AIPEU manage ultra-low-power operation during AC mains failure?

The MSP430F67691AIPEU delivers 3 µA LCD operation in LPM3 and 0.34 µA RTC-only operation in LPM3.5 - enabling multi-year battery backup without compromising display visibility or timekeeping. Its automatic supply switching circuitry seamlessly transitions between AC mains and backup battery, preserving flash/RAM contents and retaining critical metering state during outages.

What communication interfaces are available on the MSP430F67691AIPEU for smart meter connectivity?

The MSP430F67691AIPEU provides six enhanced universal serial communication interfaces: four eUSCI_A modules supporting UART, IrDA, and SPI (for optical ports, HAN, and PLC modems); and two eUSCI_B modules supporting I²C and SPI (for secure MCU-to-meter IC communication or sensor interfacing). All are configurable via software and support simultaneous multi-protocol operation.

Is the MSP430F67691AIPEU pin-compatible with other devices in the F67xx1A family?

Yes - the MSP430F67691AIPEU shares identical 128-pin LQFP (PEU) mechanical and electrical pinout with all F67xx1A variants in the same package, including MSP430F67791AIPEU and MSP430F67491AIPEU. Signal mapping differs only in SD24_B channel availability (6 vs. 7 vs. 4) and certain secondary functions, but PCB layout remains interchangeable across the PEU family.