Texas Instruments MSP430F67691AIPZR

Overview

MSP430F67691A from Texas Instruments is a polyphase metering SoC designed for high-accuracy energy measurement in 3-phase utility meters. It integrates six independent 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 512KB flash/32KB RAM, LCD controller (320 segments), and dual eUSCI modules supporting UART/IrDA/SPI/I²C - enabling ANSI C12.20 and IEC 62053-compliant metering with <0.1% error over 2000:1 dynamic range.

For engineers reviewing the MSP430F67691A datasheet, MSP430F67691A pinout, MSP430F67691A application, or MSP430F67691A equivalent, key selection considerations include its 128-pin LQFP package with 90 GPIOs, ultra-low-power RTC mode (0.34 µA), dedicated pulse output pins for active/reactive energy calibration, and support for current transformers, Rogowski coils, or shunt sensors in 3-phase 4-wire star configurations.

Technical Context

The MSP430F67691A implements a metrology-optimized architecture with seven analog front-end channels mapped to six SD24_B converters (one channel shared), each configurable for differential input and programmable gain. Its real-time calculation engine executes TI's Energy Measurement software library directly on-chip to compute kWh, kVARh, RMS, power factor, and harmonic content without external co-processing.

Power management includes automatic supply switching between AC mains and backup battery, LPM3.5 RTC mode with crystal offset calibration and temperature compensation, and LCD operation at 3 µA during mains failure. The device uses dual-domain voltage regulation (DVCC/AVCC/VASYS) with strict separation of analog and digital supplies to maintain metrology-grade noise immunity.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, with exposed thermal pad (not electrically connected). Designed for industrial meter PCBs requiring high ESD immunity and long-term reliability under temperature cycling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67691IPZ, the MSP430F67691AIPZR offers two extra SD24_B channels and 28 more GPIOs for flexible sensor routing and HAN interface expansion; versus MSP430F67791AIPEU, it trades one SD24_B channel for identical cost and power profile - optimal for cost-sensitive 3-phase meters where neutral current measurement shares a channel.

Availability

MSP430F67691AIPZR is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade submeters, grid edge monitoring nodes, and industrial power quality analyzers requiring stable component supply across 10+ year utility deployment lifecycles.

Supply support for MSP430F67691AIPZR 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, with over 40 years of expertise in precision metrology and ultra-low-power design.

The MSP430F67691A belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for ANSI/IEC-compliant energy measurement in utility-grade meters - emphasizing accuracy, security, and long-term reliability under harsh environmental conditions.

FAQ

What is the maximum number of independent 24-bit ADC channels supported by the MSP430F67691A?

The MSP430F67691A integrates six independent 24-bit sigma-delta ADC channels via its SD24_B module. This enables simultaneous sampling of three-phase voltage and current (six signals) with dedicated converters per channel, ensuring <0.1% accuracy over 2000:1 dynamic range without crosstalk. The MSP430F67691A does not support a seventh channel - that capability is reserved for the MSP430F67791A variant.

Does the MSP430F67691A support IEC 62053-22 Class 0.5S compliance out of the box?

Yes, the MSP430F67691A supports IEC 62053-22 Class 0.5S compliance when used with TI's Energy Measurement Design Center (EMDC) software and calibrated per TI's metrology reference designs. Its digital phase correction, temperature-compensated RTC, and 24-bit ADC performance meet the standard's requirements for active energy measurement accuracy, phase angle error, and temperature drift - verified using the EVM430-F6779 evaluation module.

What package type and pin count does the MSP430F67691AIPZR use?

The MSP430F67691AIPZR uses a 128-pin LQFP (PEU) package measuring 20 mm × 14 mm. It provides 90 general-purpose I/O pins, including dedicated LCD COM/SEG drivers, SD24_B analog inputs, and six eUSCI interfaces. The 'R' suffix denotes tape-and-reel packaging for automated SMT assembly, and the device is lead-free and RoHS compliant.

How does the MSP430F67691A handle power loss during meter operation?

The MSP430F67691A features automatic power supply switching between AC mains and backup battery, with LPM3.5 RTC mode drawing only 0.34 µA at 3 V to maintain timekeeping and tamper logs. Its LCD continues operating at 3 µA during AC failure, and critical metrology data is preserved in protected RAM sections backed by the auxiliary supply (AUXVCCx). The device also monitors VDSYS undervoltage to trigger graceful shutdown and nonvolatile event logging.

Can the MSP430F67691A drive a 320-segment LCD without external components?

Yes, the MSP430F67691A includes an integrated LCD_C peripheral capable of driving up to 320 segments in 4-mux or 8-mux configuration using its internal charge pump and contrast control registers. No external bias generator or op-amps are required - only standard 0.1 µF decoupling capacitors on LCDCAP and DVSS pins. The MSP430F67691A supports static, 2-, 3-, and 4-line bias modes with software-adjustable voltage levels.