Texas Instruments MSP430F6746IPEU

Overview

MSP430F6746IPEU 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 90 GPIO in a 128-pin LQFP package. It delivers <0.1% energy measurement accuracy over 2000:1 dynamic range and meets ANSI C12.20 and IEC 62053 standards for revenue-grade utility metering.

For engineers reviewing the MSP430F6746IPEU datasheet, MSP430F6746IPEU pinout, MSP430F6746IPEU application, or MSP430F6746IPEU equivalent, key selection criteria include its 4-channel SD24_B ADC configuration, LQFP-128 (PEU) package with LCD segment drive capability, RTC with temperature compensation, AES-128 encryption, and support for current transformers, Rogowski coils, or shunt sensors in 3-phase+neutral metering systems.

Technical Context

The MSP430F6746IPEU integrates a 25-MHz ultra-low-power MSP430 CPU with 32-bit hardware multiplier for real-time energy calculations, tariff management, and AMR/AMI communications. Its analog front end includes four independent 24-bit sigma-delta modulators with differential inputs and programmable gain, plus a system 10-bit ADC for auxiliary sensing.

It supports flexible power architecture with automatic switching between main and backup supplies, enabling <3 µA LPM3 operation during AC mains failure. The device executes TI's certified energy measurement software library and features dedicated pulse output pins for active/reactive energy calibration per phase.

Key Specifications

Pinout & Package

128-pin LQFP (PEU) package with 20 mm × 14 mm body size and exposed thermal pad. Pin functions include dedicated SDxP/N analog inputs for sigma-delta modulators, COMx/LCD segment outputs, AUXVCCx backup supply rails, RTC crystal connections (XIN/XOUT), and configurable eUSCI interfaces (UART/SPI/I²C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6746IPEU, the F6747IPEU offers double RAM for enhanced data buffering but no ADC expansion, while the F6766IPEU adds two more SD24_B channels for expanded metrology flexibility-neither is pin-compatible, requiring PCB redesign for migration.

Availability

MSP430F6746IPEU is available at Aetrix Electronics and suitable for smart utility metering, industrial energy monitoring, and anti-tamper meter design requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F6746IPEU 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 MSP430F6746IPEU belongs to TI's polyphase metering SoC product line, engineered specifically for cost-sensitive, high-accuracy 3-phase revenue meters with integrated security, LCD, and ultra-low-power operation.

FAQ

What is the maximum number of sigma-delta ADC channels supported by the MSP430F6746IPEU?

The MSP430F6746IPEU integrates exactly four independent 24-bit sigma-delta ADCs (SD24_B modules). This configuration supports simultaneous sampling of three-phase currents and neutral current in 4-wire metering topologies. Unlike higher-tier variants such as the MSP430F6766IPEU (6 channels) or MSP430F6779IPEU (7 channels), the MSP430F6746IPEU is optimized for standard 3-phase+neutral applications without harmonic or auxiliary measurement overhead.

Does the MSP430F6746IPEU support hardware AES encryption?

Yes, the MSP430F6746IPEU includes a dedicated hardware AES-128 encryption module. This accelerator enables secure firmware updates, encrypted meter data transmission, and protected storage of calibration constants without burdening the CPU. The module operates independently of the main CPU and supports ECB and CBC modes, making it suitable for compliance with utility cybersecurity mandates requiring authenticated and encrypted communication.

What package type and pin count does the MSP430F6746IPEU use?

The MSP430F6746IPEU uses a 128-pin LQFP package designated as PEU, with dimensions of 20 mm × 14 mm. It provides 90 general-purpose I/O pins, including dedicated LCD segment/common drivers (up to 320 segments), sigma-delta analog inputs (SDxP/SDxN), RTC crystal terminals (XIN/XOUT), and multiple eUSCI interface pins. The PEU package is shared across the MSP430F674x, F676x, and F677x families but differs in peripheral mapping and pin functionality.

How does the MSP430F6746IPEU achieve <0.1% energy measurement accuracy?

The MSP430F6746IPEU achieves <0.1% accuracy over 2000:1 dynamic range through its four 24-bit sigma-delta ADCs with programmable gain, on-chip temperature sensor for real-time gain/offset compensation, digital phase correction for CT-based current sensing, and factory-trimmed reference voltage. These features-combined with TI's certified energy measurement software library-enable compliance with ANSI C12.20 Class 0.2 and IEC 62053-21 standards without external precision components.

What low-power modes are available on the MSP430F6746IPEU and their typical current draw?

The MSP430F6746IPEU supports multiple ultra-low-power modes: Standby (LPM3) draws 2.1 µA at 3 V with RTC active; RTC-only mode (LPM3.5) consumes 0.34 µA; and shutdown mode (LPM4.5) draws just 0.18 µA. All modes retain RAM and register contents. The device wakes in under 5 µs from LPM3, enabling rapid response to metering events or communication interrupts while maintaining battery-backed operation during AC mains failure.