Texas Instruments MSP430F6779AIPZR

Overview

MSP430F6779AIPZR from Texas Instruments is a polyphase metering SoC designed for high-accuracy 3-phase energy measurement in utility smart meters. It integrates seven independent 24-bit sigma-delta ADCs (±0.1% accuracy over 2000:1 dynamic range), a 25-MHz CPU with 32-bit multiplier, 512KB flash/32KB RAM, LCD controller (320 segments), and hardware AES-128 encryption - all in a 128-pin LQFP package.

For engineers reviewing the MSP430F6779AIPZR datasheet, MSP430F6779AIPZR pinout, MSP430F6779AIPZR application, or MSP430F6779AIPZR equivalent, key selection criteria include ANSI C12.20/IEC 62053 compliance, 4-quadrant per-phase power calculation, RTC with tamper detection, ultra-low-power LPM3.5 mode (0.34 µA), and support for CT/Rogowski/shunt sensors in 3-phase 4-wire star configurations.

Technical Context

The MSP430F6779AIPZR implements a dedicated metrology subsystem with seven SD24_B modulators feeding independent digital filters, enabling simultaneous voltage/current sampling across three phases plus neutral. Its real-time computation engine executes TI's Energy Measurement Library to deliver active/reactive/apparent energy, RMS, phase angle, and harmonics without host CPU intervention.

Dual-domain power management separates analog (AVCC/AVSS) and digital (DVCC/DVSS) supplies, with auxiliary rails (AUXVCC1–3) supporting precision reference and RTC circuitry. The device uses a 32.768-kHz crystal with integrated RTCCLK divider and automatic crystal offset calibration, while the main system clock derives from programmable DCO or external XT1/XT2 sources.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5-mm pitch. Thermal pad on underside requires solder connection to ground plane for optimal thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6778AIPZR and MSP430F6769AIPZR, the MSP430F6779AIPZR provides full 7-channel metrology, 32KB RAM for extended waveform buffers, and complete neutral current support - making it the only option qualified for ANSI C12.20 Class 0.2 3-phase 4-wire revenue meters requiring certified 4-quadrant neutral energy accumulation.

Availability

MSP430F6779AIPZR is available at Aetrix Electronics and suitable for 3-phase revenue metering, smart grid edge nodes, and industrial energy monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing for UL/CE-certified production.

Supply support for MSP430F6779AIPZR 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, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.

The MSP430F6779AIPZR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for revenue-grade energy measurement in utility smart meters - emphasizing metrology accuracy, regulatory compliance, and secure firmware execution.

FAQ

What metrology standards does the MSP430F6779AIPZR meet?

The MSP430F6779AIPZR meets or exceeds ANSI C12.20 Class 0.2 and IEC 62053-21/22/23 accuracy requirements across 40–70 Hz line frequencies and 2000:1 current dynamic range. Its seven 24-bit sigma-delta ADCs, digital phase correction, and temperature-compensated energy calculation engine ensure compliance without external calibration components. The MSP430F6779AIPZR achieves this through hardware-accelerated metrology functions and TI's certified Energy Measurement Library.

How does the MSP430F6779AIPZR handle power loss during metering operations?

The MSP430F6779AIPZR supports seamless transition to battery backup via its dual-supply architecture (AVCC/DVCC) and ultra-low-power LPM3.5 mode (0.34 µA at 3 V). During AC mains failure, the RTC continues running from the 32.768-kHz crystal, preserving time/date and tamper status while retaining critical metrology data in RAM. The MSP430F6779AIPZR also features dedicated pulse output pins that maintain active/reactive energy accumulation even in backup mode.

Can the MSP430F6779AIPZR drive a 320-segment LCD without external components?

Yes, the MSP430F6779AIPZR integrates a fully featured LCD_C controller supporting up to 320 segments (8 commons × 40 segments) with programmable bias, contrast control, and charge pump. It requires only external capacitors on LCDCAP and V2/V3 pins - no external voltage dividers, op-amps, or boost converters. The MSP430F6779AIPZR's LCD driver operates down to 1.8 V and maintains segment contrast stability across temperature and battery voltage variations.

What security features are implemented in hardware on the MSP430F6779AIPZR?

The MSP430F6779AIPZR includes hardware AES-128 encryption acceleration, password-protected RTC registers, and dedicated tamper-detect pins monitoring VCC, temperature, case intrusion, and clock faults. Violations trigger automatic secure erase of sensitive registers and lockout of privileged access. These features enable compliance with IEC 62053-31 security level 3 for revenue meters. The MSP430F6779AIPZR implements these protections without consuming CPU cycles or external security ICs.

Is the MSP430F6779AIPZR pin-compatible with other devices in the F677xA family?

Yes, the MSP430F6779AIPZR in the 128-pin LQFP (PEU) package shares identical pinout and footprint with all F677xA, F676xA, and F674xA variants in the same package option - including MSP430F6778AIPZR and MSP430F6769AIPZR. This allows hardware reuse across meter tiers, though firmware must account for differences in ADC channel count, RAM size, and peripheral enablement. The MSP430F6779AIPZR's pin mapping is validated per TI's SLAS982A datasheet Figure 4-1.