Texas Instruments MSP430F67661AIPEU

Overview

MSP430F67661AIPEU from Texas Instruments is a polyphase metering SoC designed for high-accuracy energy measurement in 3-phase utility 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 modules (4 UART/IrDA/SPI + 2 SPI/I²C). It supports ANSI C12.20 and IEC 62053 compliance with <0.1% error over 2000:1 dynamic range.

For engineers reviewing the MSP430F67661AIPEU datasheet, MSP430F67661AIPEU pinout, MSP430F67661AIPEU application, or MSP430F67661AIPEU equivalent, key selection criteria include metrology ADC channel count, RTC tamper detection, low-power LPM3.5 mode (0.34 µA), and 128-pin LQFP package with 90 GPIOs for sensor interface and communication expansion.

Technical Context

The MSP430F67661AIPEU implements a dedicated metrology subsystem with six independent SD24_B modulators feeding digital filters and calibration engines, enabling per-phase 4-quadrant active/reactive power calculation. Its analog front-end supports current transformers, Rogowski coils, and shunt sensors with digital phase correction and temperature-compensated energy integration.

Digital architecture includes three-channel DMA, 16-bit CRC, four 16-bit timers (nine capture/compare registers), and an ultra-low-power real-time clock with crystal offset calibration and tamper detection-enabling secure, long-duration metering during AC mains failure with 3 µA LCD operation in LPM3.

Key Specifications

Pinout & Package

128-pin LQFP (PEU) package, 20 mm × 14 mm body size, with 90 general-purpose I/O pins and dedicated metrology analog inputs (SDxP/N), reference (VREF), system supplies (AVCC/AVSS/DVCC/DVSS/VCORE), and RTC crystal connections (XIN/XOUT).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67661AIPZ, the MSP430F67661AIPEU provides higher I/O count and full SD4–SD6 support for expanded sensor interfacing; versus MSP430F67671AIPEU, it trades 16KB RAM for lower cost while retaining identical metrology performance and package compatibility.

Availability

MSP430F67661AIPEU is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade energy monitors, and anti-tamper utility metering systems requiring stable component supply, long-term lifecycle support, and TI-qualified metrology performance.

Supply support for MSP430F67661AIPEU 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 for industrial, automotive, and consumer markets.

The MSP430F67661AIPEU belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy, ultra-low-power energy measurement in ANSI/IEC-compliant smart meters and grid-edge sensing devices.

FAQ

What is the maximum number of independent 24-bit ADC channels supported by the MSP430F67661AIPEU?

The MSP430F67661AIPEU integrates six independent 24-bit sigma-delta ADC channels (SD24_B) - sufficient for simultaneous sampling of three phase voltages, three phase currents, and neutral current in a 3-phase 4-wire meter. This matches the device's specification in Table 3-1 of SLAS983A and enables full 4-quadrant per-phase energy computation without external multiplexing.

Does the MSP430F67661AIPEU support ANSI C12.20 and IEC 62053 standards out of the box?

Yes, the MSP430F67661AIPEU is architected to meet or exceed ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S accuracy requirements. Its <0.1% error over 2000:1 dynamic range, digital phase correction, temperature compensation, and 40–70 Hz line frequency tolerance (with single calibration) are explicitly validated in TI's metrology software library and application reports for this device family.

What low-power modes are available on the MSP430F67661AIPEU, and what is the current draw in RTC-active mode?

The MSP430F67661AIPEU supports LPM3.5 (RTC active) at 0.34 µA and LPM4.5 (full shutdown) at 0.18 µA, both measured at 3 V. In LPM3.5, the RTC runs from the 32.768 kHz crystal while all other clocks and peripherals are gated - enabling decade-long battery backup for timekeeping and tamper-event timestamping without external RTC IC.

How many GPIO pins does the MSP430F67661AIPEU provide in its 128-pin LQFP (PEU) package?

The MSP430F67661AIPEU in the 128-pin LQFP (PEU) package provides 90 configurable I/O pins, as confirmed in Section 1.1 ("Package Options") and Table 3-1 of the SLAS983A datasheet. These include dedicated metrology analog inputs, LCD segment drivers, eUSCI signal lines, and general-purpose ports P1–P11 with flexible peripheral mapping.

Can the MSP430F67661AIPEU drive a 320-segment LCD directly, and what LCD bias configuration does it support?

Yes, the MSP430F67661AIPEU features an integrated LCD_C module supporting up to 320 segments using static, 2-, 3-, or 4-mux configurations. It includes programmable charge pump, contrast control, and internal bias generation - eliminating need for external LCD bias ICs. The LCDCAP pin (pin 30) connects to DVSS for proper operation, as specified in Figure 4-1 and Section 4.1.