Texas Instruments MSP430F6746IPZ

Overview

MSP430F6746IPZ from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four 24-bit sigma-delta ADCs, 256KB flash, 16KB RAM, and support for ANSI C12.20/IEC 62053 compliance in utility revenue metering applications.

For engineers reviewing the MSP430F6746IPZ datasheet, MSP430F6746IPZ pinout, MSP430F6746IPZ application, or MSP430F6746IPZ equivalent, key selection considerations include its 100-pin LQFP package, 4-channel SD24_B ADC configuration, ultra-low-power LPM3.5 mode (0.34 µA), LCD driver for 320 segments, and integrated AES-128 encryption for tamper-resistant metering designs.

Technical Context

The MSP430F6746IPZ implements a dedicated energy measurement architecture with four independent 24-bit sigma-delta modulators optimized for current/voltage sensing across three phases plus neutral, paired with TI's energy measurement software library for real-time kWh/kVARh calculation. Its 25-MHz CPU includes a 32-bit hardware multiplier for tariff management and communication protocol handling.

It integrates dual power domains (AVCC/DVCC), auxiliary supply monitoring (AUXVCC1–AUXVCC3), RTC with crystal offset calibration, and seven eUSCI modules configurable as UART/SPI/I²C - enabling concurrent AMR/AMI interface operation while maintaining <0.1% accuracy over 2000:1 dynamic range at 40–70 Hz line frequency.

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 MSP430F6746IPZ, the IPEU variant offers layout scalability at the cost of board area, while the F6766IPZ provides greater analog channel density and memory-both retain identical low-power profiles and metrology accuracy, making them functionally aligned alternatives for evolving meter architectures.

Availability

MSP430F6746IPZ is available at Aetrix Electronics and suitable for utility metering, smart grid infrastructure, and industrial energy monitoring requiring stable component supply, long-term lifecycle support, and metrology-grade certification traceability.

Supply support for MSP430F6746IPZ 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 with emphasis on reliability, precision, and ultra-low-power innovation.

The MSP430F6746IPZ belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade electricity meters that demand ANSI/IEC compliance, tamper resistance, and minimal external components.

FAQ

What metrology standards does the MSP430F6746IPZ meet?

The MSP430F6746IPZ meets or exceeds ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S accuracy requirements across 40–70 Hz line frequencies and 2000:1 dynamic range. Its sigma-delta ADC architecture, digital phase correction, and temperature-compensated energy algorithms ensure compliance without external calibration hardware. The MSP430F6746IPZ achieves this using TI's validated energy measurement software library, which is provided royalty-free with the device.

Does the MSP430F6746IPZ support real-time clock operation during power failure?

Yes, the MSP430F6746IPZ supports RTC operation in LPM3.5 mode with only 0.34 µA supply current at 3 V, enabling multi-year backup battery life. It uses dedicated AUXVCC3 rail and internal crystal offset calibration to maintain ±2 ppm accuracy over temperature. The MSP430F6746IPZ also features password protection and tamper detection on RTC pins to prevent unauthorized clock manipulation during mains outage.

How many analog input channels does the MSP430F6746IPZ support for energy measurement?

The MSP430F6746IPZ integrates four independent 24-bit sigma-delta ADCs (SD24_B), each with differential inputs and programmable gain, supporting up to four simultaneous current/voltage sensing channels. This configuration is optimized for 3-phase + neutral metering topologies. The MSP430F6746IPZ does not include additional ADCs beyond these four - unlike higher-tier variants such as MSP430F6766IPZ (six SD24_B) or MSP430F6776IPZ (seven SD24_B).

What communication interfaces are available on the MSP430F6746IPZ?

The MSP430F6746IPZ provides six enhanced Universal Serial Communication Interfaces (eUSCI), configurable as four UART, six SPI, or two I²C ports. These support concurrent communication with PLC modems, RF transceivers, optical ports, and HAN devices. All eUSCI modules operate independently with DMA support, and the MSP430F6746IPZ includes dedicated pulse output pins for active/reactive energy calibration signals.

Is the MSP430F6746IPZ pin-compatible with other devices in the MSP430F67xx family?

The MSP430F6746IPZ shares the same 100-pin LQFP (PZ) package and pinout with all other IPZ-suffixed variants in the F674x, F676x, and F677x families - including MSP430F6766IPZ and MSP430F6776IPZ. Signal mapping, power domains, and peripheral assignments are consistent across the PZ package group, enabling firmware reuse and simplified migration. However, feature availability (e.g., SD24_B count, RAM size) differs by part number, so register-level initialization must match the target device.