Texas Instruments MSP430F67761AIPZ

Overview

MSP430F67761AIPZ from Texas Instruments is a polyphase metering system-on-chip (SoC) designed for high-accuracy 3-phase energy measurement in utility-grade smart meters. It integrates seven independent 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 256KB flash/16KB RAM, and LCD controller supporting up to 320 segments - enabling <0.1% accuracy over 2000:1 dynamic range per phase while meeting ANSI C12.20 and IEC 62053 standards.

For engineers reviewing the MSP430F67761AIPZ datasheet, MSP430F67761AIPZ pinout, MSP430F67761AIPZ application, or MSP430F67761AIPZ equivalent, key selection criteria include its 128-pin LQFP (PEU) package with 90 GPIOs, dedicated pulse output pins for active/reactive energy calibration, ultra-low-power RTC mode (0.34 µA), and support for current transformers, Rogowski coils, or shunt-based sensing across three phases plus neutral.

Technical Context

The MSP430F67761AIPZ implements a metrology-optimized architecture with seven SD24_B sigma-delta modulators feeding dedicated digital filters, each configurable for phase-current or voltage channel measurement. Its analog front end includes programmable gain, digital phase correction, and temperature-compensated energy calculation logic - all executed in real time by the integrated 25-MHz CPU and hardware-accelerated peripherals including DMA, CRC, and multiple eUSCI modules.

Digital subsystems include four eUSCI_A modules (UART/IrDA/SPI) and two eUSCI_B modules (SPI/I²C), three 16-bit timers with nine capture/compare registers, and an anti-tamper–enabled RTC with crystal offset calibration. Power management supports six low-power modes, with LPM3.5 (RTC active) drawing just 0.34 µA at 3 V and wake-up latency under 5 µs from standby.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, with 90 general-purpose I/O pins and dedicated metrology signal terminals including SDxP/N differential inputs, COMx LCD segment drivers, and pulse output pins (e.g., P1.6/COM2, P1.7/COM3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67761AIPZ, the MSP430F67661AIPZ reduces metrology channel count by one while retaining identical memory, package, and peripheral set - offering a direct BOM-reduction path for neutral-less meter topologies without sacrificing accuracy or communication capability.

Availability

MSP430F67761AIPZ is available at Aetrix Electronics and suitable for 3-phase smart electricity meters, revenue-grade energy monitors, and anti-tamper utility metering systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for global deployments.

Supply support for MSP430F67761AIPZ 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 technologies for industrial, automotive, and consumer applications.

The MSP430F67761AIPZ belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy energy measurement in smart grid infrastructure - emphasizing metrology precision, ultra-low-power operation, and integrated anti-tamper security.

FAQ

What is the primary metrology accuracy specification for the MSP430F67761AIPZ?

The MSP430F67761AIPZ achieves <0.1% error over a 2000:1 dynamic range for phase current measurements, validated per ANSI C12.20 and IEC 62053-22 standards. This accuracy is enabled by its seven independent 24-bit sigma-delta ADCs, digital phase correction, and temperature-compensated calculation engine - all operating within the MSP430F67761AIPZ silicon without external calibration components.

Does the MSP430F67761AIPZ support neutral current measurement?

Yes, the MSP430F67761AIPZ supports neutral current measurement through its seventh sigma-delta ADC channel (SD6). The device is explicitly designed for three-phase + neutral configurations, with dedicated differential inputs (SD6P0/SD6N0) and hardware support for 4-quadrant cumulative energy calculation - making MSP430F67761AIPZ suitable for wye-connected utility meters requiring neutral monitoring.

What package and pin count does the MSP430F67761AIPZ use?

The MSP430F67761AIPZ uses a 128-pin LQFP (PEU) package measuring 20 mm × 14 mm, providing 90 general-purpose I/O pins. This package is confirmed in TI's SLAS983A datasheet and supports full metrology functionality including seven SD24_B analog inputs, eight LCD commons (COM0–COM7), dedicated pulse outputs, and six eUSCI interfaces - all accessible without pin multiplexing conflicts.

How does the MSP430F67761AIPZ handle low-power operation during AC mains failure?

During AC mains failure, the MSP430F67761AIPZ enters LPM3.5 (RTC mode) drawing only 0.34 µA at 3 V, preserving timekeeping and critical register states for >10 years on a CR2032 battery. Its LCD controller remains active at 3 µA, maintaining display visibility - a capability verified in Section 5.6 of the SLAS983A datasheet and essential for customer-facing outage indication in smart meters.

Which communication interfaces are integrated into the MSP430F67761AIPZ?

The MSP430F67761AIPZ integrates six enhanced universal serial communication interfaces: four eUSCI_A modules supporting UART, IrDA, and SPI; and two eUSCI_B modules supporting SPI and I²C. These are implemented as eUSCI_A0–A3 and eUSCI_B0–B1 - enabling concurrent connections to PLC modems, optical ports, RF transceivers, and local sensor networks without external bridge ICs.