Texas Instruments MSP430F67641AIPZ

Overview

MSP430F67641AIPZ 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, RTC with AUXVCC3 supply, and LCD controller supporting 320 segments - enabling <0.5% accuracy over 2000:1 dynamic range in ANSI C12.20/IEC 63053-compliant watt-hour meters.

For engineers reviewing the MSP430F67641AIPZ datasheet, MSP430F67641AIPZ pinout, MSP430F67641AIPZ application, or MSP430F67641AIPZ equivalent, key selection criteria include its 100-pin LQFP package, triple SD24_B ADC architecture, ultra-low-power LPM3.5 mode (1.24 µA), 40–70 Hz line frequency support with single calibration, and four configurable eUSCI interfaces (UART/SPI/I²C) for AMR/AMI communication.

Technical Context

The MSP430F67641AIPZ implements a dedicated metering signal chain with three independent 24-bit sigma-delta modulators feeding SD24_B converters, each supporting differential inputs and programmable gain for current transformer, Rogowski coil, or shunt sensor interfacing. Its digital phase correction engine compensates CT-induced phase errors across temperature and load.

System-level timing is managed by a dual-clock domain: AVCC-supplied analog peripherals (ADCs, VREF, LCD) operate independently from DVCC-powered CPU and digital logic, while the AUXVCC3-backed RTC maintains timekeeping during AC mains failure at 3 µA. The device executes TI's certified energy measurement software library directly from flash.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, exposed thermal pad not present, RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67621AIPZ, the MSP430F67641AIPZ provides 64KB more flash for advanced tariff algorithms and firmware resilience; versus MSP430F67791AIPZ, it lacks MPY32 and extended temp rating but offers lower BOM cost and proven field reliability in utility deployments.

Availability

MSP430F67641AIPZ is available at Aetrix Electronics and suitable for three-phase electronic watt-hour meters, utility metering infrastructure, and industrial energy monitoring systems requiring stable component supply, long-term lifecycle support, and compliance with global metrology standards.

Supply support for MSP430F67641AIPZ 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.

The MSP430F676x1A product line was engineered specifically for revenue-grade polyphase electricity metering, integrating metrology-optimized ADCs, ultra-low-power real-time processing, and certified energy software to reduce time-to-certification for ANSI/IEC-compliant meters.

FAQ

What is the primary metrology accuracy specification of the MSP430F67641AIPZ?

The MSP430F67641AIPZ achieves better than 0.5% total error over a 2000:1 dynamic range for phase current measurements, validated per ANSI C12.20 and IEC 63053 standards. This accuracy is enabled by its three 24-bit sigma-delta ADCs with digital phase correction, differential input architecture, and on-chip reference trimming - all operating within the specified 1.8–3.6 V supply and –40°C to 85°C temperature range. The MSP430F67641AIPZ maintains this performance without external calibration components.

Does the MSP430F67641AIPZ support single-point calibration across varying line frequencies?

Yes, the MSP430F67641AIPZ supports accurate energy measurement from 40 Hz to 70 Hz using a single factory calibration point. Its digital signal processing pipeline compensates for frequency-dependent gain and phase shifts in real time, eliminating the need for multi-frequency calibration tables. This capability is implemented in the SD24_B modulator control logic and verified in TI's energy measurement software library - a key design advantage of the MSP430F67641AIPZ for global meter deployments.

How does the MSP430F67641AIPZ manage power during AC mains failure?

During AC mains failure, the MSP430F67641AIPZ enters RTC mode (LPM3.5), drawing only 1.24 µA at 3 V while maintaining full real-time clock functionality via the dedicated AUXVCC3 supply rail. Critical registers, energy accumulators, and time-stamped event logs remain preserved in backup RAM. The MSP430F67641AIPZ also supports automatic switchover between main and auxiliary power sources without software intervention - ensuring uninterrupted timekeeping and data integrity.

What LCD capabilities does the MSP430F67641AIPZ provide?

The MSP430F67641AIPZ integrates a programmable LCD controller supporting up to 320 segments with static, 2-, 3-, or 4-mux configurations. It includes contrast control via internal resistor ladder, charge-pump voltage generation (using external LCDCAP capacitor), and automatic blinking control. All LCD drive signals are sourced from the AVCC domain to minimize noise coupling into metrology circuits - a critical feature confirmed in the MSP430F67641AIPZ functional block diagram and electrical specifications.

Which communication interfaces are available on the MSP430F67641AIPZ for AMI integration?

The MSP430F67641AIPZ provides four eUSCI modules: three configurable as UART or SPI (UCA0/UCA1/UCA2), and one as SPI or I²C (UCB0). This allows concurrent use of UART for RF/PLC modems, SPI for secure elements or external flash, and I²C for environmental sensors - all without resource conflict. Pin multiplexing is fully documented in the MSP430F67641AIPZ datasheet Section 4.4, confirming hardware-level independence of these interfaces.