Texas Instruments MSP430F67491AIPEUR

Overview

MSP430F67491AIPEUR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four independent 24-bit sigma-delta ADCs with <0.1% accuracy over 2000:1 dynamic range, 512KB flash/32KB RAM, and integrated LCD controller supporting up to 320 segments. It meets ANSI C12.20 and IEC 62053 standards and supports current transformers, Rogowski coils, or shunt-based sensing across three phases plus neutral.

For engineers reviewing the MSP430F67491AIPEUR datasheet, MSP430F67491AIPEUR pinout, MSP430F67491AIPEUR application, or MSP430F67491AIPEUR equivalent, key selection criteria include its 128-pin LQFP (PEU) package with 90 GPIOs, ultra-low-power RTC mode (0.34 µA), dedicated pulse output pins for active/reactive energy calibration, and support for multiple communication interfaces including four UART/IrDA/SPI-capable eUSCI_A modules and two I²C/SPI-capable eUSCI_B modules.

Technical Context

The MSP430F67491AIPEUR implements a metrology-optimized architecture with four SD24_B sigma-delta modulators feeding dedicated metrology processing logic, enabling simultaneous high-accuracy voltage and current sampling per phase. Its 25-MHz CPU includes a 32-bit hardware multiplier for real-time energy calculations without external co-processing.

It integrates dual-domain power management (AVCC/DVCC/VCORE) with automatic supply switching, temperature-compensated RTC with tamper detection, and security modules for anti-tamper compliance. The device operates across 40–70 Hz line frequencies using single-point calibration and supports digital phase correction for CT-based current measurement.

Key Specifications

Pinout & Package

128-pin LQFP (PEU) package with 20 mm × 14 mm body size and 0.5 mm pitch. Requires external connection between VDSYS1/VDSYS2 and VASYS1/VASYS2 pairs for proper analog/digital domain coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67481AIPEUR, the MSP430F67491AIPEUR provides double the RAM for extended firmware features and calibration tables; compared with MSP430F67691AIPEUR, it trades two SD24_B channels for integrated pulse outputs essential for direct LED calibration in utility-certified meters.

Availability

MSP430F67491AIPEUR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade energy monitoring, AMI endpoint nodes, tamper-resistant grid edge devices, and industrial submetering systems requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F67491AIPEUR 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 and embedded processing solutions with leadership in low-power design, metrology IP, and industrial-grade reliability.

The MSP430F67491AIPEUR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for ANSI/IEC-compliant energy measurement in utility-grade smart meters and grid-edge instrumentation.

FAQ

What is the primary metrology capability of the MSP430F67491AIPEUR?

The MSP430F67491AIPEUR integrates four independent 24-bit sigma-delta ADCs (SD24_B) optimized for polyphase energy measurement, achieving <0.1% accuracy over a 2000:1 dynamic range. It supports simultaneous sampling of voltage and current across three phases plus neutral, with digital phase correction for current transformers and temperature-compensated energy calculations - all implemented in hardware to minimize CPU loading. This makes the MSP430F67491AIPEUR ideal for ANSI C12.20 and IEC 62053-22 Class 0.2/0.5S revenue metering applications.

Does the MSP430F67491AIPEUR support hardware pulse outputs for energy calibration?

Yes, the MSP430F67491AIPEUR includes dedicated hardware pulse output pins (CF1 and CF2) that generate active and reactive energy pulses synchronized to accumulated Wh and VARh values. These outputs operate independently of CPU intervention, ensuring deterministic timing and eliminating jitter caused by software-based pulse generation. This feature directly supports utility calibration workflows requiring precise, low-jitter pulse trains compliant with IEC 62053-31 Annex D.

What low-power modes does the MSP430F67491AIPEUR offer for battery-backed operation?

The MSP430F67491AIPEUR delivers industry-leading ultra-low-power operation: Standby mode (LPM3) draws just 2.1 µA at 3 V with full RAM retention and fast wake-up (<5 µs); RTC mode (LPM3.5) consumes only 0.34 µA while maintaining calendar time and tamper detection; and Shutdown mode (LPM4.5) uses 0.18 µA for long-term backup. These modes enable >10-year coin-cell operation in smart meters, with automatic power-source switching between AC mains, supercapacitor, and battery.

How many communication interfaces does the MSP430F67491AIPEUR integrate?

The MSP430F67491AIPEUR integrates six enhanced Universal Serial Communication Interfaces (eUSCIs): four eUSCI_A modules configurable as UART, IrDA, or SPI - commonly used for optical ports, PLC modems, or secure elements - and two eUSCI_B modules supporting both I²C and SPI protocols for connecting to EEPROMs, secure ICs, or environmental sensors. All six interfaces operate concurrently without resource conflict, enabling full HAN/PLC/optical triple-interface meter designs.

Is the MSP430F67491AIPEUR pin-compatible with other members of the F67xx1A family?

Yes, the MSP430F67491AIPEUR shares identical 128-pin LQFP (PEU) mechanical and electrical pinout with all F67xx1A variants in the same package, including MSP430F676x1A and MSP430F677x1A families. Signal mapping is consistent across VREF, SDxP/N, COM/S, eUSCI, and power domains. This allows hardware reuse across meter tiers - for example, upgrading from MSP430F67491AIPEUR to MSP430F67791AIPEUR requires only firmware update, not PCB redesign.