Texas Instruments MSP430F6746AIPEUR

Overview

MSP430F6746AIPEUR from Texas Instruments is a polyphase metering SoC designed for 3-phase energy measurement in utility-grade electricity 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), AES-128 encryption, and six eUSCI interfaces (4 UART/IrDA/SPI + 2 SPI/I²C). It achieves <0.1% accuracy over 2000:1 dynamic range and meets ANSI C12.20 and IEC 62053 standards.

For engineers reviewing the MSP430F6746AIPEUR datasheet, MSP430F6746AIPEUR pinout, MSP430F6746AIPEUR application, or MSP430F6746AIPEUR equivalent, key selection considerations include its 128-pin LQFP (PEU) package with 90 GPIOs, ultra-low-power RTC mode (0.34 µA), SD24_B ADC channel count, SD4P0/SD4N0 differential inputs, and support for shunt/CT/Rogowski sensor topologies in revenue-grade metering systems.

Technical Context

The MSP430F6746AIPEUR implements a dedicated metrology subsystem with four independent SD24_B sigma-delta modulators feeding digital filters and calibration engines, enabling per-phase active/reactive power, energy, and phase-angle computation. Its real-time clock includes tamper detection, crystal offset calibration, and temperature compensation-critical for revenue meter certification.

Digital architecture features three-channel DMA, hardware AES-128, 16-bit CRC, four 16-bit timers (nine capture/compare registers), and flexible eUSCI peripherals supporting simultaneous UART (for HAN/PLC modem), I²C (for sensor hub), and SPI (for secure element or display) communication-all operating under ultra-low-power modes including LPM3.5 (0.34 µA) and LPM4.5 (0.18 µA).

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch. Designed for industrial meter PCBs requiring thermal stability and long-term reliability under wide temperature ranges.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6746AIPEUR, MSP430F6747AIPEU adds RAM headroom for complex protocols, while MSP430F6766AIPEU provides two extra SD24_B channels-both retain identical pinout, power profile, and metrology accuracy, making them drop-in upgrades where board space and firmware compatibility allow.

Availability

MSP430F6746AIPEUR is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, smart grid distribution monitors, and industrial motor control panel meters requiring stable component supply and long lifecycle support.

Supply support for MSP430F6746AIPEUR 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 MSP430F67xxA family targets energy measurement and power monitoring applications-including smart grid infrastructure and building automation-with integrated metrology ADCs, ultra-low-power operation, and security features built into silicon.

FAQ

What is the maximum number of SD24_B ADC channels supported by the MSP430F6746AIPEUR?

The MSP430F6746AIPEUR supports exactly four independent 24-bit sigma-delta ADC channels (SD24_B). This is confirmed in Table 3-1 of the SLAS982A datasheet and distinguishes it from higher-channel variants like MSP430F6766AIPEU (6 channels) and MSP430F6779AIPEU (7 channels). All four channels feature differential inputs, programmable gain, and integrated digital filtering optimized for metrology.

Does the MSP430F6746AIPEUR include hardware AES encryption?

Yes, the MSP430F6746AIPEUR includes a dedicated hardware AES-128 module. This is explicitly listed under "Highly Integrated Digital" features in Section 1.1 and verified in the functional block diagram (Figure 6-1). The module accelerates encryption/decryption operations for secure firmware updates, DLMS/COSEM communication, and tamper-proof data logging-without burdening the CPU.

What package type and pin count does the MSP430F6746AIPEUR use?

The MSP430F6746AIPEUR uses a 128-pin LQFP package designated as PEU, with 20 mm × 14 mm body dimensions and 0.5 mm pitch. This is documented in the Device Information table (Section 1.3) and Figure 4-1. It provides 90 general-purpose I/O pins, including dedicated LCD COM/SEG lines, SD24_B analog inputs, and eUSCI peripheral signals.

Can the MSP430F6746AIPEUR operate from a single 3.3-V supply?

Yes, the MSP430F6746AIPEUR operates across a supply range of 1.8 V to 3.6 V, fully supporting 3.3 V nominal systems. Section 5.3 (Recommended Operating Conditions) specifies VCC = 3.3 V ±10% as valid, and all key specifications-including SD24_B performance, CPU speed, and LCD drive-are guaranteed within this range. No external level-shifting is required for standard 3.3-V designs.

Is the MSP430F6746AIPEUR compliant with ANSI C12.20 and IEC 62053 standards?

Yes, the MSP430F6746AIPEUR is designed to meet or exceed ANSI C12.20 (2012) and IEC 62053-21/-22/-23 accuracy classes. This is stated directly in Section 1.1 Features and validated by its <0.1% error over 2000:1 dynamic range, temperature-compensated energy calculation, and 4-quadrant measurement capability-all essential for Class 0.2 and Class 0.5 revenue meter certification.