Texas Instruments MSP430F67481AIPEU

Overview

MSP430F67481AIPEU from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four independent 24-bit sigma-delta ADCs, 512KB flash, 16KB RAM, and ultra-low-power operation (0.18 µA in LPM4.5). It supports ANSI C12.20 and IEC 62053 standards, delivers <0.1% accuracy over 2000:1 dynamic range, and integrates LCD driver (320 segments), RTC with tamper detection, and six eUSCI interfaces (UART/I²C/SPI).

For engineers reviewing the MSP430F67481AIPEU datasheet, MSP430F67481AIPEU pinout, MSP430F67481AIPEU application, or MSP430F67481AIPEU equivalent, key selection criteria include metrology-grade ADC channel count, phase-angle measurement capability, pulse output support for active/reactive energy calibration, and compatibility with energy measurement software libraries such as TI's EMDC.

Technical Context

The MSP430F67481AIPEU implements a dedicated metrology subsystem with four SD24_B modulators feeding independent digital filters, enabling simultaneous voltage/current sampling per phase plus neutral. Its CPU executes TI's Energy Measurement Software Library to compute kWh, kVARh, RMS, power factor, and harmonics without external co-processing.

Power management includes automatic supply switching between AC mains and backup battery, with LPM3.5 (RTC mode) consuming only 0.34 µA and LPM4.5 (shutdown) at 0.18 µA - critical for extended data retention during mains failure. The device uses a 32-bit hardware multiplier for real-time metrology calculations at up to 25 MHz.

Key Specifications

Pinout & Package

128-pin LQFP (PEU) package, 20 mm × 14 mm body size, with 90 usable I/O pins including dedicated metrology analog inputs (SDxP/N), LCD segment/common drivers (COM0–COM7, S0–S320), RTC crystal connections (XIN/XOUT), and multiple eUSCI signal groups.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67471AIPEU, the MSP430F67481AIPEU offers double flash capacity for enhanced firmware features like encrypted firmware updates and extended data logging; compared with MSP430F67481AIPZ, it provides 90 I/Os and full 320-segment LCD support - critical for feature-rich front-panel displays in premium meters.

Availability

MSP430F67481AIPEU is available at Aetrix Electronics and suitable for 3-phase smart electricity meters, revenue-grade utility metering, and industrial power quality analyzers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MSP430F67481AIPEU 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The MSP430F67481AIPEU belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy, low-power energy measurement in smart grid infrastructure and utility-grade metering systems.

FAQ

What metrology standards does the MSP430F67481AIPEU support?

The MSP430F67481AIPEU meets or exceeds ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.2 accuracy requirements for active energy measurement. Its <0.1% error over 2000:1 dynamic range, 4-quadrant computation, and digital phase correction are validated against these standards. The MSP430F67481AIPEU also supports IEC 62053-31 for security and tamper detection features including password-protected RTC and event logging.

How many independent sigma-delta ADC channels does the MSP430F67481AIPEU have?

The MSP430F67481AIPEU integrates four independent 24-bit sigma-delta ADC channels (SD24_B) - SD0 through SD3 - each with differential inputs, programmable gain, and dedicated digital filters. This allows simultaneous, time-aligned sampling of three phase currents plus neutral or voltage inputs without multiplexing delay, directly supporting 3-phase 4-wire meter topologies. The MSP430F67481AIPEU does not share ADC resources across phases, preserving measurement integrity.

Does the MSP430F67481AIPEU support LCD display driving?

Yes, the MSP430F67481AIPEU includes an integrated LCD_C peripheral supporting up to 320 segments with static, 2-, 3-, or 4-mux operation and programmable contrast control. It drives COM0–COM7 and up to 320 segment lines (S0–S320) directly, eliminating external display controllers. The MSP430F67481AIPEU's LCD driver operates in LPM3 with only 3 µA consumption during AC mains failure - enabling uninterrupted display visibility during brownouts.

What low-power modes are available on the MSP430F67481AIPEU?

The MSP430F67481AIPEU offers six low-power modes (LPM0–LPM4.5). Key metrology-optimized states include LPM3 (standby, 2.1 µA), LPM3.5 (RTC-only, 0.34 µA), and LPM4.5 (full shutdown, 0.18 µA). All retain RAM content and support fast wake-up (<5 µs from LPM3). The MSP430F67481AIPEU's ultra-low LPM4.5 current enables >10-year operation on a single CR2032 coin cell when paired with a supercapacitor for short-term backup.

Can the MSP430F67481AIPEU perform temperature-compensated energy measurements?

Yes, the MSP430F67481AIPEU includes an on-die temperature sensor and dedicated firmware routines in TI's Energy Measurement Software Library that apply real-time correction to energy calculations. This ensures <0.1% accuracy across the full −40°C to +85°C industrial temperature range. The MSP430F67481AIPEU's temperature compensation is factory-calibrated and accessible via API calls - no external sensor or calibration effort is required.