Texas Instruments MSP430F67661AIPEUR

Overview

MSP430F67661AIPEUR from Texas Instruments is a polyphase metering SoC designed for high-accuracy 3-phase energy measurement in utility-grade smart meters. It integrates six 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 256KB flash/16KB RAM, LCD controller (320 segments), and dual eUSCI_A/B interfaces. It meets ANSI C12.20 and IEC 62053 standards and supports shunt/CT/Rogowski sensor inputs for phase A–C + neutral power monitoring.

For engineers reviewing the MSP430F67661AIPEUR datasheet, MSP430F67661AIPEUR pinout, MSP430F67661AIPEUR application, or MSP430F67661AIPEUR equivalent, key selection criteria include its 0.1% accuracy over 2000:1 dynamic range, RTC with tamper detection, ultra-low-power LPM3.5 mode (0.34 µA), and dedicated pulse outputs for active/reactive energy calibration in revenue-grade metering systems.

Technical Context

The MSP430F67661AIPEUR implements a metrology-optimized architecture with six independent SD24_B sigma-delta ADCs-each configured for differential current/voltage sensing-with digital phase correction and temperature-compensated energy calculation firmware support. Its 25-MHz CPU executes TI's Energy Measurement Software Library to compute real-time kWh, kVARh, RMS, harmonics, and power quality metrics without external co-processing.

It operates across 40–70 Hz line frequencies using single-point calibration, supports flexible supply switching (3.6 V down to 1.8 V), and integrates security features including password-protected RTC, crystal offset calibration, and anti-tamper detection via dedicated pins and internal monitoring circuits.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 90 usable I/O pins. Thermal pad not exposed; RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67661AIPZ, the MSP430F67661AIPEUR provides two additional sigma-delta ADC pairs and 28 more I/Os for expanded sensor fusion and communication flexibility; versus MSP430F67671AIPEUR, it trades 16KB RAM for lower cost while retaining identical metrology performance and pin compatibility.

Availability

MSP430F67661AIPEUR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade submetering, and grid-edge power monitoring requiring stable component supply, long-term lifecycle support, and TI-qualified metrology silicon.

Supply support for MSP430F67661AIPEUR 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 energy-efficient technologies with over 50 years of innovation in precision measurement and low-power design.

The MSP430F67661AIPEUR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for ANSI/IEC-compliant energy measurement in utility infrastructure and building automation systems.

FAQ

What is the maximum number of current sensors supported by the MSP430F67661AIPEUR?

The MSP430F67661AIPEUR integrates six 24-bit sigma-delta ADC channels (SD0–SD5), enabling direct connection to up to six differential current sensor inputs - sufficient for three-phase + neutral measurement using shunt, CT, or Rogowski coil sensors. Each channel supports programmable gain and digital phase correction, and the device's hardware synchronizes sampling across all channels to ensure vector-accurate power calculation. This configuration is validated in TI's EVM430-F6779 reference design.

Does the MSP430F67661AIPEUR support ANSI C12.20 and IEC 62053 certification out of the box?

Yes - the MSP430F67661AIPEUR is architected to meet ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S accuracy requirements. Its <0.1% error over 2000:1 dynamic range, 40–70 Hz single-calibration operation, temperature-compensated energy registers, and dedicated pulse outputs (CF1/CF2) align directly with test procedures in both standards. TI provides certified Energy Measurement Software Library source code and calibration guidance to accelerate formal certification.

What low-power modes are available on the MSP430F67661AIPEUR, and what is the lowest active current draw?

The MSP430F67661AIPEUR offers six low-power modes, including LPM3.5 (RTC active, 0.34 µA at 3 V) and LPM4.5 (full shutdown, 0.18 µA). In active mode with all peripherals enabled, typical supply current is 240 µA/MHz at 3 V. The device retains full RAM content and RTC functionality in LPM3.5, enabling wake-up in <5 µs - critical for maintaining timekeeping and responding to tamper or load-change interrupts during mains failure.

Can the MSP430F67661AIPEUR drive a 320-segment LCD without external components?

Yes - the MSP430F67661AIPEUR includes an integrated LCD_C peripheral supporting up to 320 segments (8 commons × 40 segments) with programmable contrast, internal charge pump, and bias generation. No external capacitors or voltage boosters are required for standard 3V operation. The LCDCAP pin is used only for optional external capacitor filtering; if unused, it must be tied to DVSS per datasheet requirement.

How does the MSP430F67661AIPEUR handle crystal oscillator stability for RTC accuracy?

The MSP430F67661AIPEUR implements crystal offset calibration and temperature compensation in hardware and firmware. Using the RTCCAP0/RTCCAP1 pins and internal DAC, it dynamically adjusts load capacitance to maintain ±1 ppm RTC accuracy across –40°C to +85°C. This capability is validated in TI's application report SLAA735 and is integral to ANSI C12.22 time synchronization compliance.