Texas Instruments MSP430F67751IPZR

Overview

MSP430F67751IPZR from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electronic watt-hour meters. It integrates a 25-MHz MSP430 CPU with 32-bit multiplier, seven 24-bit sigma-delta ADCs (≤0.1% accuracy over 2000:1 dynamic range), 128KB flash, 16KB RAM, LCD controller (320 segments), and dual power supply management (3.6 V to 1.8 V). It supports ANSI C12.20 and IEC 62053 compliance in utility metering applications.

For engineers reviewing the MSP430F67751IPZR datasheet, MSP430F67751IPZR pinout, MSP430F67751IPZR application, or MSP430F67751IPZR equivalent, key selection criteria include its 7-channel SD24_B ADC architecture, LQFP-100 package with 62 I/Os, RTC with crystal offset calibration, energy measurement software library support, and ultra-low-power LPM3.5 mode (0.34 µA at 3 V).

Technical Context

The MSP430F67751IPZR implements a dedicated metering subsystem with seven independent 24-bit sigma-delta modulators-six for phase/neutral current sensing and one for voltage reference-feeding into a hardware accelerator for real-time energy calculation. Its SD24_B module supports differential inputs, programmable gain, and digital phase correction for CT-based current measurement.

It features six eUSCI modules configurable as UART, SPI, or I²C interfaces for AMR/AMI communication, plus four 16-bit timers with nine capture/compare registers for pulse output generation, tariff switching, and time-of-use billing logic-all synchronized to a temperature-compensated RTC with tamper detection.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body, exposed pad not specified, RoHS-compliant, 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 applications.

Compared with MSP430F67761IPZ, the MSP430F67751IPZR offers lower flash capacity but identical metrology accuracy and low-power performance; compared with MSP430F67651IPZ, it adds a seventh SD24_B channel enabling full 3-phase + neutral current measurement without external signal conditioning.

Availability

MSP430F67751IPZR is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, smart grid AMI endpoints, and revenue-grade submeters requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F67751IPZR 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 for industrial, automotive, and communications markets.

The MSP430F67751IPZR belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade electricity measurement in utility meters-emphasizing metrology accuracy, ultra-low-power RTC operation, and integrated anti-tamper security.

FAQ

What is the maximum dynamic range and accuracy of the MSP430F67751IPZR's metrology ADC?

The MSP430F67751IPZR achieves <0.1% error over a 2000:1 dynamic range using its seven 24-bit sigma-delta ADCs (SD24_B). This performance meets or exceeds ANSI C12.20 Class 0.2 and IEC 62053-21/22/23 standards for revenue metering. The device uses digital phase correction and temperature compensation to maintain accuracy across line frequencies from 40 Hz to 70 Hz with a single calibration point.

Does the MSP430F67751IPZR support hardware pulse output for energy calibration?

Yes, the MSP430F67751IPZR includes dedicated pulse output pins for active and reactive energy. These outputs are generated directly by the metrology hardware without CPU involvement, enabling precise, jitter-free calibration pulses compliant with ANSI C12.18 and IEC 62053-31. Pulse frequency is programmable and synchronized to accumulated energy values.

What low-power modes does the MSP430F67751IPZR support, and what are their typical currents?

The MSP430F67751IPZR supports multiple low-power modes: LPM3 (standby) draws 2.1 µA at 3 V with fast wake-up (<5 µs); LPM3.5 (RTC active) consumes 0.34 µA at 3 V; and LPM4.5 (shutdown) draws only 0.18 µA at 3 V. All modes retain RTC and critical register states, enabling reliable operation during AC mains failure with minimal backup energy storage.

How many communication interfaces does the MSP430F67751IPZR integrate, and how are they configured?

The MSP430F67751IPZR integrates six enhanced universal serial communication interfaces (eUSCI). These are configurable as four UARTs, six SPIs, or two I²C ports-supporting concurrent use across optical port (UART), RF/PLC modem (SPI), and sensor hub (I²C). Pin mapping is flexible via software configuration, eliminating need for external level shifters or protocol bridges.

Is the MSP430F67751IPZR compatible with TI's Energy Measurement Software Library?

Yes, the MSP430F67751IPZR executes TI's Energy Measurement Software Library, which is provided at no cost and calculates all relevant energy (kWh, kVARh), power (kW, kVAR), and RMS parameters. The library is optimized for the device's SD24_B hardware acceleration and supports ANSI/IEC-compliant algorithms-including four-quadrant measurement, harmonic analysis, and digital phase correction-without requiring custom development.