Texas Instruments MSP430F6746AIPEU

Overview

MSP430F6746AIPEU from Texas Instruments is a polyphase metering SoC designed for high-accuracy energy measurement in 3-phase utility meters. It integrates four 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 256KB flash, 16KB RAM, LCD controller (320 segments), and hardware AES-128 encryption - all in a 128-pin LQFP package. It delivers <0.1% accuracy over 2000:1 dynamic range and meets ANSI C12.20 and IEC 62053 standards for revenue-grade metering.

For engineers reviewing the MSP430F6746AIPEU datasheet, MSP430F6746AIPEU pinout, MSP430F6746AIPEU application, or MSP430F6746AIPEU equivalent, key selection considerations include its 4-channel SD24_B ADC configuration, 90 GPIO count, RTC with tamper detection, ultra-low-power LPM3.5 mode (0.34 µA), and support for current transformers, Rogowski coils, and shunt sensors in 3-phase 4-wire star topologies.

Technical Context

The MSP430F6746AIPEU implements a dedicated metrology subsystem with four independent 24-bit sigma-delta modulators feeding digital filters and calibration engines, enabling per-phase 4-quadrant active/reactive energy computation. Its CPU executes TI's Energy Measurement Software Library to derive kWh, kVARh, RMS voltage/current, power factor, and harmonics without external co-processing.

It features six eUSCI modules (four UART/IrDA/SPI-capable, two SPI/I²C-capable), three-channel DMA, and dual-domain power management separating analog (AVCC/AVSS) and digital (DVCC/DVSS) supplies - critical for noise isolation in precision metering. The device supports single-point 40–70 Hz line frequency calibration and digital phase correction for CT-based current sensing.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch. Requires external connection between VDSYS1/VDSYS2 and VASYS1/VASYS2 pairs for proper domain biasing. LCDCAP/R33 must be tied to DVSS if unused.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6746AIPEU, the MSP430F6747AIPEU adds RAM headroom for advanced analytics, while the MSP430F6766AIPEU expands analog channel count for higher-fidelity neutral monitoring - both retain identical pinout, power profile, and metrology firmware compatibility.

Availability

MSP430F6746AIPEU is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade submetering, and grid-edge power quality monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F6746AIPEU 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 applications.

The MSP430F6746AIPEU belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy, ultra-low-power energy measurement in smart grid infrastructure and utility metering systems.

FAQ

What is the maximum number of independent analog input channels supported by the MSP430F6746AIPEU?

The MSP430F6746AIPEU integrates four independent 24-bit sigma-delta ADCs (SD24_B), each with differential inputs. This allows simultaneous sampling of up to four voltage or current channels - sufficient for 3-phase voltage plus neutral or three phase currents with one spare channel. It does not support more than four SD24_B channels, unlike higher-tier variants such as the MSP430F6766AIPEU.

Does the MSP430F6746AIPEU include hardware encryption capabilities?

Yes, the MSP430F6746AIPEU includes a dedicated hardware AES-128 encryption module. This accelerator offloads cryptographic operations from the CPU, enabling secure firmware updates, DLMS/COSEM message encryption, and tamper-resistant key storage - essential for compliance with utility cybersecurity standards like NISTIR 7628.

What is the lowest power-consumption mode available on the MSP430F6746AIPEU with RTC active?

The MSP430F6746AIPEU achieves 0.34 µA in RTC mode (LPM3.5) at 3 V, with the real-time clock running from the 32.768 kHz crystal and SRAM retention enabled. This ultra-low quiescent current extends battery backup life to over one year in mains-failure scenarios - critical for revenue meter data integrity.

Can the MSP430F6746AIPEU meet ANSI C12.20 and IEC 62053 accuracy standards?

Yes, the MSP430F6746AIPEU is designed to meet ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S accuracy requirements. Its <0.1% error over 2000:1 dynamic range, digital phase correction, temperature compensation, and factory-trimmed reference ensure certified performance without external calibration components.

What development tools are officially supported for the MSP430F6746AIPEU?

Texas Instruments supports the MSP430F6746AIPEU with the Energy Measurement Design Center (EMDC) software, the EVM430-F6779 three-phase evaluation module, and the MSP-TS430PEU128 target board. EMDC automates metrology configuration, calibration, and code generation - significantly reducing time-to-certification for utility meter designs.