Texas Instruments MSP430F67451IPZR

Overview

MSP430F67451IPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four 24-bit sigma-delta ADCs, 128KB flash, 16KB RAM, and support for ANSI C12.20/IEC 62053 compliance in utility revenue metering applications.

For engineers reviewing the MSP430F67451IPZR datasheet, MSP430F67451IPZR pinout, MSP430F67451IPZR application, or MSP430F67451IPZR equivalent, key selection criteria include its 4-channel SD24_B ADC configuration, 100-pin LQFP (PZ) package with 62 I/Os, ultra-low-power LPM3.5 mode (0.34 µA), and integrated LCD controller for up to 320 segments.

Technical Context

The MSP430F67451IPZR implements a dedicated energy measurement architecture with four independent 24-bit sigma-delta modulators optimized for phase current sensing across three-phase + neutral configurations. Its 25-MHz CPU with 32-bit hardware multiplier executes TI's certified energy measurement software library for active/reactive power, RMS, and harmonic calculations.

It integrates dual auxiliary supply domains (AUXVCC1–AUXVCC3) for isolated analog subsystem operation during mains failure, supports digital phase correction for CT-based current sensing, and delivers <0.1% accuracy over 2000:1 dynamic range - validated per ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.2 standards.

Key Specifications

Pinout & Package

100-pin LQFP (PZ) package, 14 mm × 14 mm body size, with 62 general-purpose I/O pins, dedicated energy pulse outputs (e.g., P1.6/COM2, P1.7/COM3), and segregated analog/digital power domains (AVCC/AVSS, DVCC/DVSS, AUXVCC1–3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67451IPZR, MSP430F67461IPZ offers scalable memory for feature-rich firmware, while MSP430F67651IPZ extends analog sensing capability - both retain identical 100-pin LQFP packaging and core metrology IP, enabling reuse of PCB layout and calibration infrastructure.

Availability

MSP430F67451IPZR is available at Aetrix Electronics and suitable for utility metering, industrial energy monitoring, and smart grid infrastructure projects requiring stable component supply, long lifecycle assurance, and traceable sourcing for revenue-critical applications.

Supply support for MSP430F67451IPZR 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 with deep expertise in low-power design and precision metrology.

The MSP430F67xx family is engineered specifically for revenue-grade polyphase electricity meters - integrating metrology ADCs, real-time processing, LCD control, and anti-tamper features into a single SoC to reduce system cost and certification effort.

FAQ

What is the maximum number of independent current channels supported by the MSP430F67451IPZR?

The MSP430F67451IPZR integrates four independent 24-bit sigma-delta ADCs (SD24_B), each with differential inputs and programmable gain. This allows simultaneous measurement of three phase currents (A/B/C) plus neutral current - fully supporting 3-phase 4-wire star-connected meter topologies without external ADCs. The MSP430F67451IPZR does not support more than four analog input channels within its SD24_B subsystem.

Does the MSP430F67451IPZR include hardware support for ANSI C12.20 or IEC 62053 compliance?

Yes, the MSP430F67451IPZR's metrology subsystem - including its four SD24_B ADCs, 25-MHz CPU with 32-bit multiplier, and TI energy measurement software library - is validated to meet ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.2 accuracy requirements. Compliance is achieved through factory-calibrated gain/offset coefficients stored in TLV memory and real-time digital compensation algorithms executed on the MSP430F67451IPZR itself.

What low-power modes are available on the MSP430F67451IPZR, and what is the lowest active current draw?

The MSP430F67451IPZR supports six low-power modes (LPM0–LPM4.5). Its lowest active-mode current is 2.9 mW at 10 MHz and 3 V (≈967 µA). In RTC-only mode (LPM3.5), it draws just 0.34 µA at 3 V - enabling >1-year operation on a CR2032 coin cell. Shutdown mode (LPM4.5) consumes 0.18 µA, retaining only BSL and tamper-detect functionality.

Can the MSP430F67451IPZR drive a 320-segment LCD directly, and what contrast control options exist?

Yes, the MSP430F67451IPZR includes an integrated LCD_C peripheral capable of driving up to 320 segments (8 commons × 40 segments) with internal charge pump and software-adjustable bias voltage. Contrast is controlled via register-programmable VLCD level and frame frequency tuning - eliminating external potentiometers or DACs. The LCDCAP pin supports external capacitor filtering for stable voltage generation.

What communication interfaces are available on the MSP430F67451IPZR for AMR/AMI integration?

The MSP430F67451IPZR provides six enhanced universal serial communication interfaces (eUSCI), configurable as four UARTs, six SPIs, or two I²C ports. Common AMR/AMI implementations use UART for PLC or RF module interfacing (e.g., TI CC1120), SPI for secure element or memory expansion, and I²C for environmental sensors - all supported natively without external level shifters or protocol translators.