Texas Instruments MSP430F67761AIPEU

Overview

MSP430F67761AIPEU from Texas Instruments is a polyphase metering SoC designed for high-accuracy energy measurement in 3-phase utility meters. It integrates seven 24-bit sigma-delta ADCs (±0.1% accuracy over 2000:1 dynamic range), a 25-MHz CPU with 32-bit multiplier, 256KB flash/16KB RAM, LCD controller (320 segments), and dual eUSCI_A/B interfaces - enabling ANSI C12.20 and IEC 62053-compliant metering with neutral current support and 4-quadrant power calculation.

For engineers reviewing the MSP430F67761AIPEU datasheet, MSP430F67761AIPEU pinout, MSP430F67761AIPEU application, or MSP430F67761AIPEU equivalent, key selection criteria include its 128-pin LQFP package with 90 GPIOs, ultra-low-power RTC mode (0.34 µA), dedicated pulse output pins for active/reactive energy calibration, and integrated SD24_B modulators for simultaneous phase A/B/C/neutral current sensing.

Technical Context

The MSP430F67761AIPEU implements a metrology-optimized architecture with independent SD24_B sigma-delta modulators per phase input, each feeding digital filters and metrology computation engines. Its real-time clock includes tamper detection, crystal offset calibration, and temperature compensation - critical for revenue-grade metering integrity under varying environmental conditions.

Digital subsystems include three-channel DMA for zero-CPU-overhead ADC data transfer, 16-bit CRC for firmware/data integrity, and four 16-bit timers supporting precise pulse generation and time-of-use billing. Communication is handled by four eUSCI_A modules (UART/IrDA/SPI) and two eUSCI_B modules (I²C/SPI), enabling concurrent PLC, RF, and optical port interfacing in smart meter gateways.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch, 90 configurable I/O pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67761AIPZ and MSP430F67661AIPEU, the MSP430F67761AIPEU uniquely supports full 3-phase 4-wire metrology with independent neutral current sensing and maximum I/O flexibility - essential for ANSI/IEC revenue-grade meters requiring tamper-proof neutral monitoring and multi-port communication.

Availability

MSP430F67761AIPEU is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade submeters, industrial power monitors, and grid edge sensor nodes requiring stable component supply, long-term lifecycle support, and metrology-grade accuracy certification.

Supply support for MSP430F67761AIPEU 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 specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in precision measurement and low-power design.

The MSP430F67761AIPEU belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for revenue-grade energy measurement in utility and industrial metering applications - emphasizing accuracy, security, and ultra-low-power operation.

FAQ

What metrology standards does the MSP430F67761AIPEU meet?

The MSP430F67761AIPEU meets or exceeds ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S accuracy requirements for active and reactive energy measurement. Its 24-bit sigma-delta ADCs deliver <0.1% error over 2000:1 dynamic range, and built-in digital phase correction ensures compliance across temperature and line frequency variations (40–70 Hz). The MSP430F67761AIPEU also supports 4-quadrant measurement and neutral current monitoring required for modern 3-phase 4-wire billing.

How many independent sigma-delta ADC channels does the MSP430F67761AIPEU support?

The MSP430F67761AIPEU integrates seven independent 24-bit SD24_B sigma-delta modulators - sufficient for simultaneous sampling of three phase voltages, three phase currents, and neutral current. Each channel features programmable gain, differential input, and digital filtering. This architecture enables true 3-phase 4-wire metrology without multiplexing delays or accuracy degradation. The MSP430F67761AIPEU uses these channels to compute active, reactive, apparent, and fundamental power values in real time.

What low-power modes are available on the MSP430F67761AIPEU, and what is the lowest current draw?

The MSP430F67761AIPEU offers multiple low-power modes including LPM3 (standby, 2.1 µA), LPM3.5 (RTC-only, 0.34 µA), and LPM4.5 (shutdown, 0.18 µA), all at 3 V. In LPM3.5, the real-time clock remains active with full RAM retention and tamper detection enabled - ideal for maintaining time-stamped energy logs during AC mains failure. The MSP430F67761AIPEU achieves this ultra-low consumption via segmented power domains and optimized clock gating, making it suitable for battery-backed metering applications with >10-year runtime.

Does the MSP430F67761AIPEU include hardware support for energy pulse outputs?

Yes, the MSP430F67761AIPEU provides dedicated hardware pulse output pins for both active (kWh) and reactive (kVARh) energy - generated independently by metrology hardware without CPU involvement. These pulses comply with IEC 62053-31 pulse output specifications (e.g., 1000 imp/kWh) and support calibration traceability. Pulse width, frequency, and duty cycle are configurable in firmware. This feature ensures deterministic, jitter-free energy reporting in the MSP430F67761AIPEU - critical for revenue-grade meter certification.

What communication interfaces are integrated into the MSP430F67761AIPEU?

The MSP430F67761AIPEU integrates six enhanced Universal Serial Communication Interfaces: four eUSCI_A modules (supporting UART, IrDA, and SPI) and two eUSCI_B modules (supporting I²C and SPI). This enables concurrent communication with optical probes (UART), PLC modems (SPI), RF modules (UART/IrDA), and secure element ICs (I²C). All interfaces operate independently with DMA support - ensuring real-time metrology processing continues uninterrupted during data transmission. The MSP430F67761AIPEU leverages this flexibility for multi-port smart meter architectures.