Texas Instruments MSP430F67641AIPN

Overview

MSP430F67641AIPN from Texas Instruments is a polyphase metering SoC designed for revenue-grade three-phase energy measurement. It integrates three 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 128KB flash/8KB RAM, LCD controller (320 segments), and RTC with AUXVCC3-powered calibration-enabling <0.5% accuracy over 2000:1 dynamic range in ANSI C12.20/IEC 63053-compliant watt-hour meters.

For engineers reviewing the MSP430F67641AIPN datasheet, MSP430F67641AIPN pinout, MSP430F67641AIPN application, or MSP430F67641AIPN equivalent, key selection criteria include phase-current measurement accuracy, low-power RTC operation during mains failure (1.24 µA in LPM3.5), 80-pin LQFP package I/O count (52), and support for CT/Rogowski/shunt sensors with digital phase correction.

Technical Context

The MSP430F67641AIPN implements a dedicated metering architecture with three independent SD24_B sigma-delta modulators feeding a shared digital filter chain, enabling simultaneous per-phase active/reactive/apparent energy calculation. Its 25-MHz CPU executes TI's energy measurement software library in real time while managing tariff scheduling and AMR/AMI communications via four configurable eUSCI ports.

Power management includes five low-power modes (LPM0–LPM4.5), with LPM3.5 (RTC mode) drawing only 1.24 µA at 3 V and supporting wake-up in 3 µs. The device uses separate analog (AVCC/AVSS) and digital (DVCC/DVSS) power domains, plus three auxiliary supplies (AUXVCC1–3) for RTC and LCD bias, ensuring metrological stability under varying line conditions.

Key Specifications

Pinout & Package

80-pin LQFP (PN) package, 12 mm × 12 mm body size, 0.5 mm pitch, exposed thermal pad not present. Pin functions validated per TI SLASE50A datasheet Section 4.2 (Table 4-2) and Figure 4-2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67621AIPN and ADuCM3029BBCZ, the MSP430F67641AIPN delivers certified Class 0.5 accuracy with minimal external components, whereas alternatives trade metrological rigor for general-purpose compute or ecosystem flexibility-making it the sole choice for utility-certified three-phase meters.

Availability

MSP430F67641AIPN is available at Aetrix Electronics and suitable for smart electricity meters, industrial energy monitors, and AMI gateway nodes requiring stable component supply, long-term lifecycle assurance, and TI-qualified metrology performance.

Supply support for MSP430F67641AIPN 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 founded in 1930, specializing in analog, embedded processing, and high-reliability silicon for industrial, automotive, and energy infrastructure markets.

The MSP430F676x1A product line was engineered specifically for revenue metering applications, integrating metrology-optimized ADCs, ultra-low-power RTC, and sensor interface circuitry to eliminate external calibration components and reduce system-level certification effort.

FAQ

What is the maximum dynamic range supported by the MSP430F67641AIPN for phase current measurement?

The MSP430F67641AIPN achieves <0.5% measurement error over a 2000:1 dynamic range for phase current, verified per ANSI C12.20 and IEC 63053 standards. This performance is enabled by its three 24-bit sigma-delta ADCs with programmable gain amplifiers and digital filtering-allowing accurate readings from 1 mA to 2 A using shunt resistors or CTs without range switching.

Does the MSP430F67641AIPN support digital phase correction for current transformers?

Yes, the MSP430F67641AIPN includes hardware-assisted digital phase correction that measures and compensates for phase lag in current transformers. Using exact phase-angle measurements from its sigma-delta modulators, the device applies real-time correction coefficients stored in flash-eliminating manual trimmer adjustments and maintaining accuracy across temperature and aging.

How does the MSP430F67641AIPN manage power during AC mains failure?

The MSP430F67641AIPN supports seamless power failover using its dedicated AUXVCC3 rail for RTC operation and LPM3.5 mode drawing just 1.24 µA at 3 V. During mains loss, the device automatically switches to supercapacitor or coin-cell backup, retaining time/date, energy registers, and tamper logs for >10 years-critical for time-of-use billing integrity.

What communication interfaces are available on the MSP430F67641AIPN?

The MSP430F67641AIPN provides four eUSCI modules configurable as UART, SPI, or I²C. Specifically, it supports three UART channels (for AMR/AMI modems), three SPI interfaces (for isolated PLC transceivers or secure elements), and one I²C port (for EEPROM or environmental sensors)-all accessible through its 52 GPIOs in the 80-pin LQFP package.

Is the MSP430F67641AIPN pin-compatible with other devices in the MSP430F676x1A family?

Yes, the MSP430F67641AIPN shares identical pinout and electrical characteristics with the MSP430F67621AIPN in the 80-pin LQFP (PN) package. Both devices use the same signal mapping for SD24_B inputs, eUSCI peripherals, and LCD drivers-enabling hardware reuse across Class 0.5 and Class 1 meter designs with only flash/RAM capacity differences.