Texas Instruments MSP430F67491IPZ

Overview

MSP430F67491IPZ from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four 24-bit sigma-delta ADCs, 512KB flash, 32KB RAM, and support for ANSI C12.20/IEC 62053 compliance in utility revenue metering applications.

For engineers reviewing the MSP430F67491IPZ datasheet, MSP430F67491IPZ pinout, MSP430F67491IPZ application, or MSP430F67491IPZ equivalent, key selection criteria include its 100-pin LQFP (PZ) package, 62 I/O count, ultra-low-power LPM3.5 mode (0.34 µA), LCD driver for 320 segments, and dedicated pulse outputs for active/reactive energy calibration.

Technical Context

The MSP430F67491IPZ integrates a 25-MHz CPU with 32-bit hardware multiplier to execute TI's energy measurement software library, enabling real-time tariff management and AMR/AMI communication. Its analog front end includes four independent SD24_B sigma-delta converters with differential inputs and programmable gain, plus a system 10-bit ADC with six external channels.

It supports flexible power architecture with automatic switching between main and backup supplies, including AUXVCC1–AUXVCC3 rails for isolated subsystem operation. The device implements digital phase correction for current transformers and temperature-compensated energy calculations across 40–70 Hz line frequencies using single-point calibration.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm, industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67481IPZ, the MSP430F67491IPZ provides double RAM for larger firmware stacks and longer data retention; versus MSP430F67691IPZ, it trades two SD24_B channels for lower BOM cost and simplified layout in standard 3-phase meter designs.

Availability

MSP430F67491IPZ is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade energy monitoring, and AMI endpoint node development requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F67491IPZ 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 MSP430F674x1 product line is engineered specifically for polyphase electricity metering, integrating metrology-grade ADCs, low-power real-time processing, and utility-grade security into a single SoC to reduce system cost and certification effort.

FAQ

What is the maximum dynamic range accuracy of the MSP430F67491IPZ for phase current measurement?

The MSP430F67491IPZ achieves <0.1% accuracy over a 2000:1 dynamic range for phase current measurement, validated per ANSI C12.20 and IEC 62053 standards. This performance is enabled by its four 24-bit sigma-delta ADCs with programmable gain and digital phase correction, ensuring metrology-grade precision across full-load to light-load conditions without external calibration.

Does the MSP430F67491IPZ support hardware-based anti-tamper features?

Yes, the MSP430F67491IPZ includes integrated security modules for anti-tamper functionality, including dedicated tamper detect pins with configurable voltage thresholds, hardware-enforced password protection for the RTC, and secure erase triggers. These features are documented in the device's technical documentation and implemented in silicon to meet utility-grade tamper-resistance requirements.

What LCD configuration does the MSP430F67491IPZ support?

The MSP430F67491IPZ supports an LCD driver capable of driving up to 320 segments using eight COM lines (COM0–COM7) and configurable bias/voltage settings. It includes contrast control and operates down to 3 µA in LPM3 mode, enabling ultra-low-power display operation during AC mains failure - a key requirement for revenue meter applications.

How many communication interfaces does the MSP430F67491IPZ provide, and how are they configured?

The MSP430F67491IPZ provides six enhanced Universal Serial Communication Interfaces (eUSCI), configurable as up to four UARTs, six SPIs, or two I²C interfaces. Pin mapping is flexible via software register control, allowing simultaneous use of UART for modem communication, SPI for secure element interfacing, and I²C for sensor hubs - all supported natively by the MSP430F67491IPZ without external logic.

What is the standby current consumption of the MSP430F67491IPZ in LPM3 mode?

The MSP430F67491IPZ consumes 2.1 µA in LPM3 standby mode at 3 V, with wake-up latency under 5 µs. This ultra-low-power state maintains RAM contents and real-time clock operation while disabling CPU and most peripherals - essential for maintaining timekeeping and critical registers during utility power outages in smart meter deployments.