Texas Instruments MSP430F6779IPZR

Overview

MSP430F6779IPZR from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electronic watt-hour meters. It integrates seven 24-bit sigma-delta ADCs, 512KB flash, 32KB RAM, LCD controller (320 segments), AES-128 encryption, and real-time clock with temperature compensation - delivering <0.1% energy measurement accuracy over 2000:1 dynamic range per phase in utility metering applications.

For engineers reviewing the MSP430F6779IPZR datasheet, MSP430F6779IPZR pinout, MSP430F6779IPZR application, or MSP430F6779IPZR equivalent, this device supports ANSI C12.20 and IEC 62053 compliance, four-quadrant power calculation, digital phase correction for CTs, and ultra-low-power operation down to 0.18 µA in LPM4.5 - critical for battery-backed meter designs requiring long-term data retention during mains failure.

Technical Context

The MSP430F6779IPZR implements a dedicated analog front-end with seven independent SD24_B sigma-delta modulators for simultaneous voltage/current sampling across three phases plus neutral, each with differential inputs and programmable gain. Its 25-MHz CPU executes TI's energy measurement software library for active/reactive/apparent energy, RMS, harmonics, and tariff management without external co-processing.

Power architecture includes dual-domain supply (AVCC/DVCC/VCORE), auxiliary supplies (AUXVCC1–3) for backup subsystems, and automatic switching between main and backup power sources. The RTC operates in LPM3.5 at 0.34 µA while maintaining crystal offset calibration and temperature-compensated timekeeping.

Key Specifications

Pinout & Package

The MSP430F6779IPZR is housed in a 100-pin LQFP (PZ) package measuring 14 mm × 14 mm, with 62 general-purpose I/O pins, dedicated SD24_B analog input pairs (SD0P0/SD0N0 through SD6P0/SD6N0), and segregated analog/digital power domains (AVCC/AVSS, DVCC/DVSS, VCORE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6779IPEU, the IPZR variant offers identical metrology performance in a smaller 14×14 mm footprint ideal for space-constrained meters; versus AD7403ASTZ, it delivers complete system-on-chip functionality - eliminating external components, reducing certification effort, and enabling faster time-to-market for new meter designs.

Availability

MSP430F6779IPZR is available at Aetrix Electronics and suitable for smart grid revenue meters, industrial energy monitors, and prepayment electricity meters requiring stable component supply, long lifecycle support, and traceable sourcing for global utility deployments.

Supply support for MSP430F6779IPZR 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies for industrial, automotive, and communications markets.

The MSP430F6779IPZR belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade electricity meters that demand metrology accuracy, regulatory compliance (ANSI/IEC), and robust security in harsh utility environments.

FAQ

What is the maximum line frequency range supported by the MSP430F6779IPZR for accurate energy measurement?

The MSP430F6779IPZR supports accurate energy measurement across a 40-Hz to 70-Hz line frequency range using a single calibration point. This eliminates the need for multiple calibration tables and enables deployment in both 50-Hz (Europe/Asia) and 60-Hz (North America) utility grids without firmware changes. The device maintains <0.1% accuracy over this full range due to adaptive digital phase correction and temperature-compensated reference circuitry within the MSP430F6779IPZR silicon.

Does the MSP430F6779IPZR include hardware support for encryption and secure boot?

Yes, the MSP430F6779IPZR integrates a dedicated hardware AES-128 encryption module capable of encrypting/decrypting data blocks in under 10 µs. It also supports secure boot via password-protected memory protection units and tamper-detect pins that trigger immediate memory wipe upon physical intrusion detection. These features are implemented in silicon and do not rely on software-only methods, ensuring robust protection for firmware and metering data in the MSP430F6779IPZR.

How many independent sigma-delta ADC channels does the MSP430F6779IPZR provide, and what is their resolution?

The MSP430F6779IPZR provides seven independent 24-bit sigma-delta ADC channels (SD24_B). Each channel supports differential inputs, programmable gain (1× to 128×), and simultaneous sampling - enabling concurrent acquisition of three-phase voltages, three-phase currents, and neutral current with no inter-channel crosstalk. This architecture is fundamental to the MSP430F6779IPZR's ability to achieve <0.1% accuracy in polyphase metering applications.

What low-power modes are available on the MSP430F6779IPZR, and what is the lowest current consumption achievable?

The MSP430F6779IPZR offers multiple low-power modes including LPM3 (standby, 2.1 µA), LPM3.5 (RTC active, 0.34 µA), and LPM4.5 (shutdown, 0.18 µA) - all measured at 3 V. In LPM4.5, the device retains RTC time and backup RAM contents while disabling all clocks and regulators. This ultra-low quiescent current enables >10-year battery life in backup operation, a key requirement for revenue meters certified under IEC 62053-21 and ANSI C12.22 - and is fully specified for the MSP430F6779IPZR in its production datasheet.

Can the MSP430F6779IPZR drive a large LCD display, and how many segments does it support?

Yes, the MSP430F6779IPZR integrates a full-featured LCD controller supporting up to 320 segments with built-in contrast control and charge pump. It drives common-electrode LCDs using COM0–COM7 (8 commons) and SEG0–SEG319 (320 segments) directly - eliminating external bias generators and segment drivers. The controller operates in ultra-low-power mode (3 µA in LPM3), allowing continuous display visibility during AC mains failure, a critical capability confirmed for the MSP430F6779IPZR in utility meter applications.