Texas Instruments MSP430F6749AIPZR

Overview

MSP430F6749AIPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase energy measurement in utility-grade smart meters. It integrates four independent 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit hardware multiplier, 512KB flash/32KB RAM, LCD controller (320 segments), and AES-128 encryption-enabling ANSI C12.20 and IEC 62053-compliant metering with <0.1% accuracy over 2000:1 dynamic range.

For engineers reviewing the MSP430F6749AIPZR datasheet, MSP430F6749AIPZR pinout, MSP430F6749AIPZR application, or MSP430F6749AIPZR equivalent, key selection considerations include its 128-pin LQFP package, four SD24_B ADC channels (vs. six or seven in higher-tier F677x/F676x variants), 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 MSP430F6749AIPZR implements a dedicated metrology subsystem with four 24-bit SD24_B 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, THD, and power factor without external co-processing.

It features six eUSCI modules (four UART/IrDA/SPI-capable, two SPI/I²C-capable), three-channel DMA, 16-bit CRC, and hardware AES-128-all synchronized to metrology timing requirements. The device operates across 1.8–3.6 V and supports automatic power-source switching between AC mains and backup battery during outages.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch. Pin count includes 90 general-purpose I/Os with configurable secondary functions including ADC inputs, timer capture/compare, eUSCI signals, LCD segment/common drivers, and SD24_B analog inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6769AIPZR, the MSP430F6749AIPZR saves BOM cost by omitting two SD24_B channels while retaining full metrology library compatibility; versus MSP430F6748AIPZR, it provides double RAM capacity for complex DLMS stacks or extended waveform logging buffers.

Availability

MSP430F6749AIPZR is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, smart grid distribution monitors, and prepayment energy gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F6749AIPZR 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 company founded in 1930, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The MSP430F6749AIPZR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy, low-power energy measurement in ANSI/IEC-compliant utility meters and grid-edge monitoring devices.

FAQ

What is the maximum number of independent 24-bit ADC channels supported by the MSP430F6749AIPZR?

The MSP430F6749AIPZR integrates exactly four independent 24-bit sigma-delta ADC channels (SD24_B) for simultaneous sampling of phase currents, neutral current, and voltage references. This matches the "F674x" family designation and is confirmed in Table 3-1 of the SLAS982A datasheet-distinguishing it from the six-channel F676x and seven-channel F677x variants.

Does the MSP430F6749AIPZR support hardware-based AES encryption?

Yes, the MSP430F6749AIPZR includes a dedicated hardware AES-128 encryption module that accelerates cryptographic operations without CPU intervention. This feature is explicitly listed under "Highly Integrated Digital" in Section 1.1 and enables secure firmware updates and DLMS/COSEM data encryption in compliance with IEC 62053-31.

What package type and pin count does the MSP430F6749AIPZR use?

The MSP430F6749AIPZR uses a 128-pin LQFP package (suffix "PEU"), measuring 20 mm × 14 mm with 0.5 mm pitch. It provides 90 usable I/O pins, including dedicated SD24_B analog inputs, LCD segment/common drivers, and six eUSCI interfaces-fully documented in Figure 4-1 and Table 4-1 of the SLAS982A datasheet.

Can the MSP430F6749AIPZR operate in battery backup mode during AC mains failure?

Yes, the MSP430F6749AIPZR supports ultra-low-power RTC mode (LPM3.5) drawing only 0.34 µA at 3 V, allowing continuous timekeeping and event logging during mains outage. Its flexible power architecture automatically switches between AC-derived and battery sources-enabling >10-year backup operation with standard coin-cell batteries.

Which communication interfaces are available on the MSP430F6749AIPZR for smart meter connectivity?

The MSP430F6749AIPZR provides six enhanced Universal Serial Communication Interfaces (eUSCI): four eUSCI_A modules supporting UART, IrDA, and SPI; and two eUSCI_B modules supporting SPI and I²C. These enable concurrent optical port (UART), PLC modem (SPI), and sensor hub (I²C) connectivity without external bus controllers.