Texas Instruments MSP430F67491IPEUR

Overview

MSP430F67491IPEUR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four 24-bit sigma-delta ADCs, 512KB flash, 32KB RAM, and support for ANSI C12.20/IEC 62053-compliant energy measurement across 40–70 Hz line frequency with <0.1% accuracy over 2000:1 dynamic range.

For engineers reviewing the MSP430F67491IPEUR datasheet, MSP430F67491IPEUR pinout, MSP430F67491IPEUR application, or MSP430F67491IPEUR equivalent, this device delivers calibrated three-phase + neutral power measurement, integrated LCD driver (320 segments), ultra-low-power RTC (0.34 µA in LPM3.5), and hardware-based anti-tamper security - critical for utility-grade revenue metering designs.

Technical Context

The MSP430F67491IPEUR implements a dedicated metering subsystem with four independent SD24_B sigma-delta modulators feeding into a high-precision digital signal processing engine, enabling simultaneous voltage/current sampling per phase with digital phase correction and four-quadrant energy calculation. Its 25-MHz CPU includes a 32-bit hardware multiplier optimized for real-time tariff management and metrology firmware execution.

It integrates dual auxiliary supply domains (AUXVCC1–AUXVCC3) for isolated analog front-end biasing and backup operation during AC mains failure, supports flexible clocking via XT1 (32.768 kHz), DCO, and REFO, and features mappable eUSCI peripherals (4 UART, 6 SPI, 2 I²C) for AMR/AMI communication stack implementation.

Key Specifications

Pinout & Package

128-pin LQFP (PEU) package with 20 mm × 14 mm body size, 0.5 mm pitch, and exposed thermal pad. Designed for industrial meter PCB layouts requiring EMI resilience and long-term reliability under temperature cycling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67481IPEUR, the MSP430F67491IPEUR provides double the RAM for advanced data logging and tariff management; versus MSP430F67691IPEUR, it trades two SD24_B channels for lower system cost while retaining identical metrology accuracy and compliance certification path.

Availability

MSP430F67491IPEUR is available at Aetrix Electronics and suitable for utility metering, industrial submetering, and grid-edge sensor applications requiring stable component supply, long lifecycle support, and traceable sourcing for safety-critical deployments.

Supply support for MSP430F67491IPEUR 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 utility infrastructure design expertise.

The MSP430F67xx family was engineered specifically for revenue-grade polyphase metering, integrating metrology-optimized ADCs, low-power real-time processing, and hardware security to reduce system cost and accelerate certification to ANSI/IEC standards.

FAQ

What is the maximum number of independent current measurement channels supported by the MSP430F67491IPEUR?

The MSP430F67491IPEUR integrates four independent 24-bit sigma-delta ADCs (SD24_B), each with differential inputs and programmable gain. These are configured for simultaneous sampling of phase A, B, C, and neutral currents - enabling full four-wire 3-phase metrology with true neutral current monitoring. No external ADCs are required for basic ANSI/IEC-compliant metering.

Does the MSP430F67491IPEUR support IEC 62053-22 Class 0.2 accuracy out of the box?

Yes - the MSP430F67491IPEUR achieves <0.1% error over 2000:1 dynamic range per phase, meeting IEC 62053-22 Class 0.2 requirements. This is validated using TI's energy measurement software library and standard shunt/CT sensor configurations. Calibration is performed once across 40–70 Hz, eliminating per-frequency tuning.

How does the MSP430F67491IPEUR handle power loss during metering operation?

The MSP430F67491IPEUR uses three auxiliary supply domains (AUXVCC1–AUXVCC3) to maintain critical functions during AC mains failure. AUXVCC3 powers the RTC and backup RAM in LPM3.5 mode (0.34 µA), preserving time and last-measured values. The device retains full metrology state and resumes sampling within 5 µs upon power restoration.

Can the LCD driver in the MSP430F67491IPEUR operate independently of the main CPU core?

Yes - the integrated LCD_C module operates autonomously in low-power modes (LPM3/LPM3.5). It drives up to 320 segments with programmable contrast and blinking control while the CPU remains in deep sleep. This allows continuous display visibility during mains outage with only 3 µA total current draw, extending battery life significantly.

What communication interfaces are available on the MSP430F67491IPEUR for AMI/AMR integration?

The MSP430F67491IPEUR provides six enhanced USCI modules: four eUSCI_A (configurable as UART/IrDA/SPI) and two eUSCI_B (configurable as SPI/I²C). This enables concurrent connections to RF modems (UART), secure elements (SPI), and environmental sensors (I²C) - all without external protocol bridges or level shifters.