Texas Instruments MSP430F67641IPN

Overview

MSP430F67641IPN from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase energy measurement, featuring three independent 24-bit sigma-delta ADCs with differential inputs, 128KB flash/8KB RAM, and real-time clock with dedicated AUXVCC3 supply. It achieves <0.5% accuracy over 2000:1 dynamic range per phase and meets ANSI C12.20 and IEC 63053 standards in utility metering applications.

For engineers reviewing the MSP430F67641IPN datasheet, MSP430F67641IPN pinout, MSP430F67641IPN application, or MSP430F67641IPN equivalent, this device delivers certified metrology performance, ultra-low-power operation (1.24 µA in RTC mode), integrated LCD driver (320 segments), and flexible communication interfaces (UART/SPI/I²C) for smart meter firmware development and compliance validation.

Technical Context

The MSP430F67641IPN integrates TI's high-precision 24-bit SD24_B ADC subsystem with programmable gain and digital phase correction for current transformers, enabling four-quadrant power calculation per phase across 40–70 Hz line frequencies using single-point calibration. Its 25-MHz CPU executes TI's energy measurement software library for kWh, kVARh, and demand calculations without external co-processors.

It supports simultaneous analog sampling of voltage and current channels via three independent sigma-delta modulators, with internal reference and temperature-compensated RTC operating from AUXVCC3 to maintain timekeeping during AC mains failure. The device uses dual-domain power management-AVCC/DVCC for digital/analog domains and dedicated AUXVCCx supplies for RTC and LCD-to isolate critical metrology functions from supply noise.

Key Specifications

Pinout & Package

80-pin LQFP (PN) package with 12 mm × 12 mm body size and exposed thermal pad. Designed for industrial meter PCB layouts requiring EMI resilience and long-term reliability under continuous AC mains operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67641IPN, the MSP430F67621IPN offers identical metrology accuracy and pin compatibility at reduced memory cost, while the ADuCM3029BBCZ trades integrated sigma-delta metrology for broader MCU capabilities-requiring external signal conditioning to match revenue-grade performance.

Availability

MSP430F67641IPN is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, utility metering deployments, and industrial energy monitoring systems requiring stable component supply, long lifecycle support, and certified metrology performance.

Supply support for MSP430F67641IPN 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 high-reliability silicon for industrial, automotive, and energy infrastructure markets.

The MSP430F676x1 product line was engineered specifically for revenue-grade polyphase electricity metering-integrating metrology ADCs, RTC, LCD, and communications into a single ultra-low-power SoC to reduce system cost and accelerate certification.

FAQ

What metrology standards does the MSP430F67641IPN meet?

The MSP430F67641IPN meets or exceeds ANSI C12.20 Class 0.5 and IEC 63053 requirements for active and reactive energy measurement accuracy. Its 24-bit sigma-delta ADC subsystem, digital phase correction, and temperature-compensated RTC ensure compliance across –40°C to 85°C industrial temperature range without external calibration hardware. All test results are documented in TI's SLAS998A production datasheet.

Does the MSP430F67641IPN support direct connection to current transformers (CTs)?

Yes, the MSP430F67641IPN supports direct CT interfacing via its three differential SD24_B analog inputs (SD0P0/SD0N0, SD1P0/SD1N0, SD2P0/SD2N0). It includes built-in digital phase correction to compensate for CT-induced phase lag and programmable gain to accommodate varying CT output levels-eliminating need for external op-amps or discrete phase-shift networks in most designs.

How does the MSP430F67641IPN maintain timekeeping during AC mains failure?

The MSP430F67641IPN uses a dedicated AUXVCC3 power supply rail for its real-time clock (RTC) module, allowing operation from a backup coin cell or supercapacitor during AC loss. In RTC mode (LPM3.5), it draws only 1.24 µA at 3 V and retains crystal offset calibration and temperature compensation-ensuring ±2 ppm accuracy over temperature and time without external RTC ICs.

What LCD configuration does the MSP430F67641IPN support?

The MSP430F67641IPN integrates an LCD controller supporting up to 320 segments with software-controllable contrast and internal charge pump. It provides eight COM outputs (COM0–COM7) and 52 segment outputs (S0–S51), compatible with 4-mux or 8-mux static/dynamic displays. The LCDCAP/R33 pin must be connected to DVSS if unused to stabilize the internal bias generator.

Is the MSP430F67641IPN pin-compatible with other devices in the F676x1 family?

Yes, the MSP430F67641IPN in the 80-pin LQFP (PN) package shares identical pinout with the MSP430F67621IPN. Both devices use the same 52 GPIO mapping, SD24_B input locations, AUXVCCx supply pins, and LCD interface signals-enabling hardware reuse across memory-tier variants without PCB redesign.