Texas Instruments MSP430F67451IPEU

Overview

MSP430F67451IPEU from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, integrating a 25-MHz ultra-low-power MCU, four 24-bit sigma-delta ADCs, LCD controller (320 segments), and dedicated energy pulse outputs. It delivers <0.1% accuracy over 2000:1 dynamic range for phase current and meets ANSI C12.20 and IEC 62053 standards in utility metering applications.

For engineers reviewing the MSP430F67451IPEU datasheet, MSP430F67451IPEU pinout, MSP430F67451IPEU application, or MSP430F67451IPEU equivalent, key selection considerations include its 128-pin LQFP package with 90 GPIOs, 128KB flash/16KB RAM configuration, SD24_B ADC channel count, RTC tamper detection support, and compliance-critical metrology firmware stack.

Technical Context

The MSP430F67451IPEU implements a dedicated metrology subsystem with four independent 24-bit sigma-delta modulators (SD24_B) optimized for current/voltage sensing across three phases plus neutral, paired with digital phase correction and temperature-compensated energy calculation. Its CPU executes TI's certified energy measurement software library for active/reactive power, RMS, harmonics, and tariff management.

It supports flexible power architecture with auxiliary supplies (AUXVCC1–AUXVCC3), dual-domain voltage regulation (DVCC/AVCC/VCORE), and ultra-low-power modes: LPM3 (2.1 µA), LPM3.5 (0.34 µA), and LPM4.5 (0.18 µA), enabling >10-year battery-backed operation during mains failure.

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 MSP430F67461IPEU and MSP430F67651IPEU, the MSP430F67451IPEU offers optimal cost-performance balance for entry-level 3-phase meters requiring certified metrology accuracy but minimal firmware footprint and no auxiliary sensor inputs.

Availability

MSP430F67451IPEU is available at Aetrix Electronics and suitable for utility metering, smart grid infrastructure, and industrial energy monitoring applications requiring stable component supply, long-term lifecycle assurance, and TI-qualified metrology firmware support.

Supply support for MSP430F67451IPEU 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The MSP430F674x1 product line is engineered specifically for revenue-grade polyphase electricity meters, integrating metrology-optimized ADCs, tamper-resistant peripherals, and certified energy calculation firmware to reduce system BOM and accelerate ANSI/IEC certification.

FAQ

What is the maximum number of differential analog inputs supported by the MSP430F67451IPEU?

The MSP430F67451IPEU integrates four independent 24-bit sigma-delta modulators (SD24_B), each supporting one differential analog input pair (e.g., SD0P0/SD0N0). This enables simultaneous high-accuracy measurement of up to four signals-such as three phase currents and neutral current-without external multiplexing. The MSP430F67451IPEU does not support more than four SD24_B channels.

Does the MSP430F67451IPEU include hardware-accelerated energy calculation firmware?

Yes, the MSP430F67451IPEU executes TI's certified energy measurement software library, which runs on-chip and calculates active/reactive energy, RMS, fundamental/harmonic content, and power quality parameters in real time. This library is provided royalty-free and pre-validated for ANSI C12.20 and IEC 62053 compliance. The MSP430F67451IPEU relies on this firmware for metrology accuracy.

What low-power modes are available on the MSP430F67451IPEU, and what functions remain active in LPM3?

The MSP430F67451IPEU supports six low-power modes. In LPM3 (standby mode), the CPU and MCLK are disabled while ACLK (32.768 kHz) remains active, sustaining the RTC, LCD controller (3 µA), and tamper detection logic. Wake-up occurs in under 5 µs. This mode is critical for maintaining timekeeping and display during AC mains failure. The MSP430F67451IPEU achieves 2.1 µA typical current draw in LPM3 at 3 V.

Can the MSP430F67451IPEU drive a 320-segment LCD directly, and what voltage support does it provide?

Yes, the MSP430F67451IPEU includes an integrated LCD_C peripheral supporting up to 320 segments (8 commons × 40 segments) with programmable contrast control and internal charge pump. It operates from DVCC (1.8–3.6 V) and supports static, 2-, 3-, and 4-mux configurations. No external bias generator or resistor network is required, reducing BOM cost and board space. The MSP430F67451IPEU's LCD driver is fully compatible with standard STN/FSTN displays used in utility meters.

How does the MSP430F67451IPEU ensure metrology accuracy across varying line frequencies and temperatures?

The MSP430F67451IPEU achieves <0.1% accuracy over 2000:1 dynamic range from 40 Hz to 70 Hz using a single calibration point, enabled by digital phase correction for current transformers and temperature-compensated energy calculations. Its internal reference and SD24_B modulators are characterized across –40°C to +85°C, and the RTC includes crystal offset calibration with temperature lookup tables. These features eliminate need for multiple calibrations, ensuring consistent MSP430F67451IPEU performance in global deployments.