Texas Instruments MSP430F67791IPZR

Overview

MSP430F67791IPZR 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, a 25-MHz CPU with 32-bit multiplier, 512KB flash/32KB RAM, LCD controller (320 segments), and dedicated pulse outputs for active/reactive energy calibration - enabling <0.1% accuracy over 2000:1 dynamic range per phase in ANSI C12.20/IEC 62053-compliant utility metering systems.

For engineers reviewing the MSP430F67791IPZR datasheet, MSP430F67791IPZR pinout, MSP430F67791IPZR application, or MSP430F67791IPZR equivalent, key selection criteria include its 100-pin LQFP (PZ) package with 62 I/Os, ultra-low-power LPM3.5 mode (0.34 µA), RTC with crystal offset calibration, and support for current transformers, Rogowski coils, or shunt-based sensing in 3-phase 4-wire star configurations.

Technical Context

The MSP430F67791IPZR implements TI's high-precision 24-bit sigma-delta modulator architecture with differential inputs and programmable gain across all seven SD24_B channels, enabling simultaneous voltage/current sampling for three phases plus neutral. Its dedicated energy measurement hardware acceleration and integrated TI energy measurement software library offload real-time tariff management and four-quadrant power calculations from the CPU.

It features six enhanced eUSCI modules configurable as UART, SPI, or I²C interfaces, four 16-bit timers with nine capture/compare registers, and a password-protected RTC with temperature-compensated crystal calibration - all operating within an industrial –40°C to 85°C range and supporting flexible supply options including automatic mains/backup switching.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, industrial temperature range (–40°C to +85°C). Pin mapping validated per TI SLAS815D Rev. September 2018, Table 4-2 (100-Pin PZ Package).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67791IPEU, the MSP430F67791IPZR offers identical metrology performance in a smaller 14 mm × 14 mm footprint with 62 I/Os - ideal for space-constrained meter designs; versus MSP430F67691IPZ, it adds one dedicated SD24_B channel for full neutral current monitoring without external components.

Availability

MSP430F67791IPZR is available at Aetrix Electronics and suitable for smart grid revenue metering, industrial energy monitoring, and AMI gateway node development requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-grade deployments.

Supply support for MSP430F67791IPZR 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 with emphasis on energy efficiency, reliability, and system-level integration.

The MSP430F67791IPZR belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade electricity meters that demand metrology accuracy, ultra-low-power operation during mains failure, and integrated security for tamper resistance.

FAQ

What is the primary metrology accuracy specification of the MSP430F67791IPZR?

The MSP430F67791IPZR achieves <0.1% energy measurement accuracy over a 2000:1 dynamic range for phase current, meeting ANSI C12.20 Class 0.1 and IEC 62053-22 Class 0.2 standards. This is enabled by its seven 24-bit sigma-delta ADCs with digital phase correction and temperature-compensated energy calculation firmware - all validated in TI's SLAS815D datasheet under recommended operating conditions.

Does the MSP430F67791IPZR support neutral current measurement?

Yes, the MSP430F67791IPZR supports full 3-phase + neutral current measurement using its seven independent 24-bit sigma-delta ADC channels. Four channels are allocated to phase currents (A/B/C/neutral), three to phase voltages, and all share common reference and calibration - enabling four-quadrant cumulative energy calculation per TI SLAS815D Section 1.1 and Figure 1-1.

What low-power modes are available on the MSP430F67791IPZR and their typical current draw?

The MSP430F67791IPZR offers LPM3 (standby, 2.1 µA), LPM3.5 (RTC active, 0.34 µA), and LPM4.5 (shutdown, 0.18 µA), all measured at 3 V per SLAS815D Section 5.5. These modes retain RTC time, SRAM content, and register states - critical for maintaining billing integrity during AC mains failure in utility meter applications.

How many communication interfaces does the MSP430F67791IPZR integrate and what protocols do they support?

The MSP430F67791IPZR integrates six enhanced USCI (eUSCI) modules: four configurable as UART/IrDA/SPI and two as SPI/I²C. This enables concurrent AMI communication (e.g., RF or PLC modem via UART), local diagnostics (SPI to EEPROM), and sensor interfacing (I²C to temperature sensor) - all without external protocol translators, as confirmed in SLAS815D Section 1.1 and Table 3-1.

Is the MSP430F67791IPZR pin-compatible with other devices in the F677x1 family?

Yes, the MSP430F67791IPZR shares identical pinout and signal mapping with all other 100-pin LQFP (PZ) variants in the F677x1 family, including MSP430F67781IPZ and MSP430F67771IPZ. This allows design reuse across memory/configurations while maintaining PCB layout compatibility - verified in TI SLAS815D Table 4-1 and Section 4.1.