Texas Instruments MSP430F67671AIPZR

Overview

MSP430F67671AIPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring six independent 24-bit sigma-delta ADCs, 256KB flash, 32KB RAM, and integrated LCD controller supporting up to 320 segments. It delivers <0.1% energy measurement accuracy over 2000:1 dynamic range per phase and meets ANSI C12.20 and IEC 62053 standards.

For engineers reviewing the MSP430F67671AIPZR datasheet, MSP430F67671AIPZR pinout, MSP430F67671AIPZR application, or MSP430F67671AIPZR equivalent, key selection criteria include its 128-pin LQFP (PEU) package with 90 GPIOs, ultra-low-power RTC mode (0.34 µA), dedicated pulse outputs for active/reactive energy calibration, and support for current transformers, Rogowski coils, and shunt sensors in utility-grade metering systems.

Technical Context

The MSP430F67671AIPZR integrates a 25-MHz 16-bit CPU with 32-bit hardware multiplier optimized for real-time metrology calculations, alongside seven peripheral modules including three DMA channels, 16-bit CRC engine, and four 16-bit timers with nine capture/compare registers. Its analog subsystem combines six SD24_B sigma-delta converters (24-bit, differential, programmable gain) and a 10-bit SAR ADC with six external + two internal channels.

Digital connectivity includes six eUSCI modules: four UART/IrDA/SPI-capable (eUSCI_A0–A3) and two SPI/I²C-capable (eUSCI_B0–B1). Power management supports multiple low-power modes - LPM3 (2.1 µA), LPM3.5 (RTC mode, 0.34 µA), and LPM4.5 (shutdown, 0.18 µA) - enabling extended battery backup during AC mains failure.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch, 90 general-purpose I/O pins. Thermal pad not present; standard reflow profile compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67691AIPZR, the MSP430F67671AIPZR reduces flash by 256 KB and omits one SD24_B channel - lowering cost while retaining full Class 0.2 compliance; versus MSP430F67671AIPZ, it trades package size and I/O count for higher display and interface flexibility in larger meter housings.

Availability

MSP430F67671AIPZR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade energy monitoring, AMI endpoint nodes, tamper-resistant grid sensors, and industrial submetering requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F67671AIPZR 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 specializing in analog, embedded processing, and connectivity technologies, with decades of experience in metrology and smart grid solutions.

The MSP430F67xx1A product line targets energy measurement and power monitoring applications, integrating high-accuracy analog front-ends, ultra-low-power processing, and secure firmware execution for utility-grade smart meters.

FAQ

What is the maximum number of LCD segments supported by the MSP430F67671AIPZR?

The MSP430F67671AIPZR supports up to 320 LCD segments via its integrated LCD_C module with eight COM lines and software-configurable bias and frame frequency. This capability eliminates external segment drivers and enables full-feature displays for Class 0.2 meters without increasing bill-of-materials cost or PCB area.

Does the MSP430F67671AIPZR support hardware-accelerated metrology calculations?

Yes, the MSP430F67671AIPZR includes a 32-bit hardware multiplier and dedicated DMA channels that offload real-time RMS, fundamental, harmonic, and power factor computations from the CPU. This allows the 25-MHz CPU to manage communications, security, and display tasks concurrently with metrology processing.

How does the MSP430F67671AIPZR achieve <0.1% accuracy over 2000:1 dynamic range?

The MSP430F67671AIPZR achieves <0.1% accuracy through six independent 24-bit sigma-delta ADCs with programmable gain, digital phase correction for current transformers, temperature-compensated reference circuitry, and on-chip calibration coefficients stored in flash - all validated per ANSI C12.20 and IEC 62053-22 test procedures.

What low-power modes are available on the MSP430F67671AIPZR and their typical current draw?

The MSP430F67671AIPZR offers LPM3 (2.1 µA at 3 V, wake-up <5 µs), LPM3.5 (RTC mode, 0.34 µA), and LPM4.5 (shutdown, 0.18 µA). These modes enable >10-year battery life in backup operation and maintain display functionality at 3 µA in LPM3 - critical for uninterrupted metering during AC mains failure.

Can the MSP430F67671AIPZR be used in tamper-detection applications?

Yes, the MSP430F67671AIPZR includes password-protected RTC with tamper-detection pins, crystal offset calibration, and integrated security modules supporting AES-128 encryption and secure boot. These features meet ANSI C12.22 requirements for detecting and logging physical intrusion, clock manipulation, and unauthorized firmware access.