Texas Instruments MSP430F67681AIPZR

Overview

MSP430F67681AIPZR from Texas Instruments is a polyphase metering SoC designed for high-accuracy energy measurement in 3-phase utility meters. It integrates six 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 512KB flash/16KB RAM, LCD controller (320 segments), and dual eUSCI_A/B interfaces. It meets ANSI C12.20 and IEC 62053 standards and supports shunt/CT/Rogowski sensor inputs for phase current accuracy <0.1% over 2000:1 dynamic range.

For engineers reviewing the MSP430F67681AIPZR datasheet, MSP430F67681AIPZR pinout, MSP430F67681AIPZR application, or MSP430F67681AIPZR equivalent, key selection considerations include its 128-pin LQFP package, RTC with tamper detection, ultra-low-power LPM3.5 mode (0.34 µA), dedicated pulse outputs for active/reactive energy calibration, and support for 40–70 Hz line frequency with single-point calibration.

Technical Context

The MSP430F67681AIPZR implements a metrology-specific architecture with seven independent SD24_B modulators (six active in this variant) feeding dedicated digital filters and metrology calculation engines. Its analog front end includes programmable gain amplifiers, reference buffers, and temperature-compensated energy computation logic aligned to ANSI/IEC Class 0.2 requirements.

Digital subsystems include three-channel DMA for zero-CPU-overhead ADC data transfer, 16-bit CRC for firmware integrity, four Timer_A modules (9 capture/compare registers total), and six eUSCI peripherals-four UART/IrDA/SPI-capable (eUSCI_A0–A3) and two SPI/I²C-capable (eUSCI_B0–B1)-enabling concurrent HAN, PLC, and optical port communication in smart meter designs.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch, 90 GPIOs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67681AIPZR, the MSP430F67691AIPZR provides higher metrology channel count and memory headroom for future-proofing, while the MSP430F67671AIPZR offers identical analog performance at lower cost-making all three viable for tiered meter product families sharing the same PCB layout.

Availability

MSP430F67681AIPZR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade submetering, and AMI endpoint node deployments requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F67681AIPZR 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The MSP430F67681AIPZR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy, low-power energy measurement in smart grid infrastructure and building automation systems.

FAQ

What is the ADC configuration of the MSP430F67681AIPZR?

The MSP430F67681AIPZR integrates six independent 24-bit sigma-delta ADC channels (SD24_B) optimized for metrology. Each channel supports differential inputs, programmable gain, and digital filtering. This configuration enables simultaneous sampling of three-phase voltage/current plus neutral-meeting ANSI C12.20 Class 0.2 accuracy requirements without external signal conditioning.

Does the MSP430F67681AIPZR support tamper detection?

Yes, the MSP430F67681AIPZR includes hardware-based tamper detection via its real-time clock (RTC) module. It monitors case intrusion, voltage glitches, and temperature anomalies, triggering configurable responses such as secure memory wipe or alert flag assertion. The RTC also features password protection and crystal offset calibration to maintain timekeeping integrity under attack conditions.

What communication interfaces does the MSP430F67681AIPZR provide?

The MSP430F67681AIPZR provides six enhanced universal serial communication interfaces: four eUSCI_A modules supporting UART, IrDA, and SPI; and two eUSCI_B modules supporting SPI and I²C. This allows concurrent implementation of optical port (UART), PLC modem (SPI), and sensor hub (I²C) without external protocol bridges-reducing system complexity and bill-of-materials cost.

How does the MSP430F67681AIPZR handle power supply failures?

The MSP430F67681AIPZR supports automatic power supply switching between AC mains, supercapacitors, and coin-cell batteries. In LPM3.5 mode, it consumes only 0.34 µA at 3 V-enabling >10 years of RTC operation on a CR2032 cell. Critical metrology data is retained in RAM during brownout, and the LCD remains functional at 3 µA, ensuring uninterrupted time/date display during outages.

Is the MSP430F67681AIPZR pin-compatible with other devices in the F676x1A family?

Yes, the MSP430F67681AIPZR in the 128-pin LQFP (PEU) package shares identical pinout and footprint with all other F676x1A and F677x1A variants in the same package option-including MSP430F67691AIPZR and MSP430F67671AIPZR-enabling hardware reuse across meter performance tiers without PCB redesign.