Texas Instruments MSP430F67481IPEU

Overview

MSP430F67481IPEU from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring 512KB flash, 16KB RAM, four 24-bit sigma-delta ADCs, and support for ANSI C12.20/IEC 62053 compliance with <0.1% accuracy over 2000:1 dynamic range. It integrates LCD driver (320 segments), RTC with temperature compensation, anti-tamper security modules, and six eUSCI ports configurable as UART/SPI/I²C.

For engineers reviewing the MSP430F67481IPEU datasheet, MSP430F67481IPEU pinout, MSP430F67481IPEU application, or MSP430F67481IPEU equivalent, key selection criteria include its 128-pin LQFP (PEU) package with 90 I/Os, ultra-low-power operation (0.18 µA in LPM4.5), 25-MHz CPU with 32-bit multiplier, and dedicated energy measurement peripherals including pulse output pins for active/reactive energy calibration.

Technical Context

The MSP430F67481IPEU implements a dedicated metering architecture with four independent 24-bit SD24_B sigma-delta ADCs for phase current/voltage sampling, each supporting differential inputs and programmable gain. Its energy calculation engine executes TI's certified energy measurement software library, enabling four-quadrant power computation per phase and cumulative totals without external co-processing.

It features dual power domains (AVCC/DVCC), auxiliary supply switching (AUXVCC1–AUXVCC3), and hardware-accelerated digital phase correction for current transformers - all operating within a 40–70 Hz line frequency range using single-point calibration. The device supports real-time tariff management and secure communication via configurable eUSCI interfaces.

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 MSP430F67471IPEU, the MSP430F67481IPEU provides double flash capacity for advanced firmware features; compared with MSP430F67481IPZ, it delivers 28 additional I/Os and enhanced thermal performance in the larger 128-pin LQFP package - critical for high-reliability revenue meter deployments.

Availability

MSP430F67481IPEU is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, utility metering infrastructure, and industrial energy monitoring systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for revenue-critical applications.

Supply support for MSP430F67481IPEU 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 delivering analog and embedded processing solutions for industrial, automotive, and consumer applications with emphasis on precision, reliability, and low-power innovation.

The MSP430F674x1 product line is engineered specifically for polyphase electricity metering, integrating metrology-grade ADCs, secure real-time clocks, and anti-tamper peripherals to reduce bill-of-materials cost and accelerate certification to ANSI/IEC standards.

FAQ

What is the primary metrology accuracy specification for the MSP430F67481IPEU?

The MSP430F67481IPEU achieves <0.1% accuracy over a 2000:1 dynamic range for phase current measurements, meeting or exceeding ANSI C12.20 and IEC 62053-21/22 standards. This performance is enabled by its four 24-bit sigma-delta ADCs, digital phase correction, and temperature-compensated energy calculation engine - all validated under standard test conditions defined in TI's SLAS815D datasheet.

Does the MSP430F67481IPEU support direct connection to current transformers and shunt sensors?

Yes, the MSP430F67481IPEU supports both current transformers (CTs) and shunt resistors via its four independent 24-bit SD24_B sigma-delta ADCs with differential inputs and programmable gain. Digital phase correction for CTs is implemented in hardware, while shunt-based designs benefit from built-in offset/gain calibration registers and temperature compensation - eliminating external signal conditioning components in most configurations.

What low-power modes are available on the MSP430F67481IPEU and their typical current draw?

The MSP430F67481IPEU offers multiple ultra-low-power modes: LPM3 (standby) draws 2.1 µA at 3 V with RTC active and wake-up in <5 µs; LPM3.5 (RTC-only) consumes 0.34 µA; and LPM4.5 (shutdown) draws just 0.18 µA while retaining RTC and critical registers. These modes are optimized for battery-backed operation during AC mains failure in revenue meters.

How many communication interfaces does the MSP430F67481IPEU provide and how are they configured?

The MSP430F67481IPEU integrates six enhanced Universal Serial Communication Interfaces (eUSCI), configurable as up to four UARTs, six SPIs, or two I²C ports. Each eUSCI module supports independent clock sources and can be dynamically reassigned via software - enabling simultaneous AMR/AMI module connectivity, optical port interfacing, and PLC communication without external protocol translators.

Is the MSP430F67481IPEU pin-compatible with other devices in the MSP430F674x1 family?

Yes, the MSP430F67481IPEU is pin-compatible with all 128-pin LQFP (PEU) variants in the MSP430F674x1 family, including MSP430F67451IPEU, MSP430F67461IPEU, MSP430F67471IPEU, and MSP430F67491IPEU. Pin functions and power domains match exactly, allowing hardware reuse across different flash/RAM/ADC configurations - verified in TI's SLAS815D datasheet Table 4-1.