Texas Instruments MSP430F67681IPEUR

Overview

MSP430F67681IPEUR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring a 25-MHz ultra-low-power CPU, six 24-bit sigma-delta ADCs, LCD driver supporting up to 320 segments, and hardware-based energy calculation engine compliant with ANSI C12.20 and IEC 62053 standards. It delivers <0.1% accuracy over 2000:1 dynamic range for phase current measurement and operates across –40°C to 85°C industrial temperature range.

For engineers reviewing the MSP430F67681IPEUR datasheet, MSP430F67681IPEUR pinout, MSP430F67681IPEUR application, or MSP430F67681IPEUR equivalent, key selection criteria include its 6-channel SD24_B ADC configuration, 512KB flash/16KB RAM memory layout, LQFP-128 (PEU) package with 90 GPIOs, RTC with crystal offset calibration, and integrated anti-tamper security modules for utility-grade revenue metering.

Technical Context

The MSP430F67681IPEUR implements a dedicated metering architecture with seven independent sigma-delta modulators (six active in this variant), each paired with programmable gain amplifiers and digital filters optimized for current transformer, Rogowski coil, or shunt-based sensing. Its energy measurement software library executes real-time four-quadrant power calculations-including active, reactive, and apparent energy-directly on-chip without host intervention.

Power management integrates multiple low-power modes: LPM3 (2.1 µA at 3 V), LPM3.5 (RTC mode, 0.34 µA), and LPM4.5 (shutdown, 0.18 µA), enabling extended backup operation during AC mains failure. The device supports flexible supply options including primary DVCC/AVCC and auxiliary AUXVCC1–AUXVCC3 rails with automatic switching and charge-limiting control.

Key Specifications

Pinout & Package

The MSP430F67681IPEUR is housed in a 128-pin LQFP (PEU) package measuring 20 mm × 14 mm, with 90 general-purpose I/O pins, dedicated analog input pairs for sigma-delta modulators, and segregated power domains (DVCC/AVCC/AUXVCC/VCORE) requiring board-level decoupling per TI layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67691IPEUR, the MSP430F67681IPEUR trades one SD24_B channel and 16 KB RAM for lower unit cost while maintaining identical metrology accuracy, low-power performance, and communication interfaces-making it optimal for standard 3-phase+neutral metering without auxiliary sensing.

Availability

MSP430F67681IPEUR is available at Aetrix Electronics and suitable for smart grid revenue metering, industrial energy monitoring, and renewable integration metering requiring stable component supply across multi-year utility procurement cycles.

Supply support for MSP430F67681IPEUR 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 since 1930.

The MSP430F676x1 family was engineered specifically for revenue-grade polyphase electricity metering-integrating metrology ADCs, secure real-time processing, and low-power system management into a single die to replace multi-chip meter designs.

FAQ

What metrology standards does the MSP430F67681IPEUR comply with?

The MSP430F67681IPEUR meets or exceeds ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S accuracy requirements for active energy measurement. Its <0.1% error over 2000:1 dynamic range, digital phase correction, and temperature-compensated energy calculation engine are validated per these standards. The MSP430F67681IPEUR achieves this compliance through on-chip hardware acceleration-not external calibration components-enabling certified meter designs with minimal external BOM.

How many sigma-delta ADC channels does the MSP430F67681IPEUR support?

The MSP430F67681IPEUR integrates six independent 24-bit sigma-delta ADCs (SD24_B modules), each with differential inputs, programmable gain amplifiers, and digital filters. This configuration supports simultaneous sampling of three-phase voltage and current (six analog inputs), plus neutral current or auxiliary measurements. The MSP430F67681IPEUR's six-channel count is confirmed in TI's SLAS815D Device Comparison Table and matches its position in the F676x1 family variant matrix.

What is the package type and pin count of the MSP430F67681IPEUR?

The MSP430F67681IPEUR uses a 128-pin LQFP package designated "PEU", with physical dimensions of 20 mm × 14 mm. It provides 90 general-purpose I/O pins, including dedicated LCD segment/commons, sigma-delta analog inputs, and multiple eUSCI serial interfaces. This package is shared across the F676x1, F677x1, and F674x1 families-with pin compatibility confirmed in TI's SLAS815D Table 4-1 for PEU variants.

Does the MSP430F67681IPEUR include an integrated LCD controller?

Yes, the MSP430F67681IPEUR includes a fully integrated LCD_C peripheral supporting up to 320 segments with built-in contrast control, charge pump, and static/multiplexed drive modes. It drives common 4-backplane (COM0–COM7) displays directly-eliminating external bias generators. The MSP430F67681IPEUR's LCD_C module operates down to 1.8 V and maintains display functionality in LPM3 (3 µA) during AC mains failure, as specified in the device's Features section.

What low-power modes are available on the MSP430F67681IPEUR and their typical currents?

The MSP430F67681IPEUR offers three key low-power modes: Standby (LPM3) draws 2.1 µA at 3 V with RTC active and full RAM retention; RTC mode (LPM3.5) consumes 0.34 µA at 3 V with only RTC and 32 bytes of backup RAM powered; Shutdown (LPM4.5) uses 0.18 µA at 3 V for minimal state retention. These values are measured per TI SLAS815D Section 5.5 and enable >10-year battery life in sealed meter applications. The MSP430F67681IPEUR wakes from any mode in <5 µs.