Texas Instruments MSP430F67651IPZR

Overview

MSP430F67651IPZR 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, six 24-bit sigma-delta ADCs, LCD controller (320 segments), and real-time clock with temperature compensation - delivering <0.1% energy measurement accuracy over 2000:1 dynamic range at 40–70 Hz line frequency in utility metering applications.

For engineers reviewing the MSP430F67651IPZR datasheet, MSP430F67651IPZR pinout, MSP430F67651IPZR application, or MSP430F67651IPZR equivalent, key selection considerations include its 128-pin LQFP (PEU) package, 128 KB flash / 16 KB RAM configuration, ANSI C12.20 and IEC 62053 compliance, ultra-low-power LPM3.5 mode (0.34 µA), and dedicated pulse output pins for active/reactive energy calibration.

Technical Context

The MSP430F67651IPZR implements a multi-channel sigma-delta analog front end with six independent 24-bit SD24_B converters supporting differential inputs and programmable gain, enabling simultaneous phase A/B/C and neutral current/voltage sampling. Its energy calculation engine executes TI's certified energy measurement software library directly on-chip, eliminating external DSP requirements.

Power management includes dual auxiliary supplies (AUXVCC1–AUXVCC3), automatic supply switching between main and backup rails, and hardware-accelerated four-quadrant power computation per phase. The device supports digital phase correction for current transformers and single-point calibration across 40–70 Hz line frequencies.

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 MSP430F67661IPZR, the MSP430F67651IPZR offers optimized cost for standard Class 0.2 metering without sacrificing accuracy or low-power performance; compared with MSP430F67651IPZ, it provides 28 additional GPIOs for expanded sensor fusion or multi-interface communication in premium meter platforms.

Availability

MSP430F67651IPZR is available at Aetrix Electronics and suitable for smart grid revenue metering, industrial energy monitoring, and renewable integration metering requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F67651IPZR 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 specializing in analog, embedded processing, and connectivity technologies with leadership in ultra-low-power microcontrollers and precision analog signal chains.

The MSP430F67651IPZR belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade electricity meters that demand metrology accuracy, regulatory compliance (ANSI/IEC), and robust anti-tamper security in harsh utility environments.

FAQ

What is the maximum number of independent analog input channels supported by the MSP430F67651IPZR?

The MSP430F67651IPZR integrates six independent 24-bit sigma-delta ADC modules (SD24_B), each with differential inputs and programmable gain. This enables simultaneous sampling of up to six analog channels - typically configured for three phase currents, three phase voltages, or combinations including neutral current/voltage - meeting full 3-phase 4-wire metering requirements without external multiplexers. The MSP430F67651IPZR also includes a separate 10-bit ADC with six external channels plus internal temperature/supply monitoring.

Does the MSP430F67651IPZR support hardware-accelerated energy calculations?

Yes, the MSP430F67651IPZR includes dedicated hardware acceleration for energy metrology, including a 32-bit hardware multiplier and specialized instructions for RMS, fundamental, and harmonic computations. It executes TI's certified energy measurement software library entirely on-chip, performing active/reactive/apparent energy, power factor, and frequency calculations in real time without offloading to external processors. This ensures deterministic timing and metrology-grade repeatability in the MSP430F67651IPZR.

What low-power modes are available on the MSP430F67651IPZR, and what is the lowest current draw?

The MSP430F67651IPZR supports multiple low-power modes: LPM3 (2.1 µA at 3 V), LPM3.5 (RTC mode, 0.34 µA at 3 V), and LPM4.5 (shutdown mode, 0.18 µA at 3 V). In LPM3.5, the real-time clock remains active with crystal oscillator running while core logic is powered down - enabling accurate timekeeping and wake-up events during AC mains failure. This ultra-low standby current extends backup battery life significantly in the MSP430F67651IPZR.

How does the MSP430F67651IPZR ensure compliance with ANSI C12.20 and IEC 62053 standards?

The MSP430F67651IPZR achieves ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S compliance through its 24-bit sigma-delta ADC architecture (<0.1% error over 2000:1 dynamic range), digital phase correction for CT errors, temperature-compensated energy calculations, and 40–70 Hz line frequency tolerance with single calibration. TI provides certified energy measurement software and test reports validating these specifications - all integral to the MSP430F67651IPZR's design and qualification.

Can the MSP430F67651IPZR drive a large LCD display, and how many segments does it support?

Yes, the MSP430F67651IPZR includes an integrated LCD controller supporting up to 320 segments with programmable contrast control and internal charge pump. It provides eight common outputs (COM0–COM7) and 40 segment outputs (via multiplexed GPIOs), enabling direct drive of high-resolution numeric and alphanumeric displays common in utility meters. No external LCD bias generator or driver IC is required, simplifying design and reducing BOM cost in the MSP430F67651IPZR.