Texas Instruments MSP430F67651IPEU

Overview

MSP430F67651IPEU from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring six 24-bit sigma-delta ADCs, 128KB flash, 16KB RAM, and 90 GPIOs in a 128-pin LQFP package. It delivers <0.1% energy measurement accuracy over 2000:1 dynamic range, meets ANSI C12.20 and IEC 62053 standards, and supports three-phase + neutral power measurement with digital phase correction.

For engineers reviewing the MSP430F67651IPEU datasheet, MSP430F67651IPEU pinout, MSP430F67651IPEU application, or MSP430F67651IPEU equivalent, key selection considerations include its dedicated pulse output pins for active/reactive energy calibration, ultra-low-power LPM3.5 mode (0.34 µA), LCD driver supporting up to 320 segments, and integrated security modules for anti-tamper compliance in utility metering deployments.

Technical Context

The MSP430F67651IPEU implements a 25-MHz CPU with 32-bit hardware multiplier for real-time tariff rate management and energy calculation, paired with seven independent sigma-delta modulators (six used, one reserved) for simultaneous voltage/current sampling across three phases and neutral. Its AFE architecture includes programmable gain, internal reference, and temperature-compensated energy computation.

It integrates dual auxiliary supply rails (AUXVCC1–AUXVCC3) for backup subsystem operation during AC mains failure, enabling 3 µA LCD operation in LPM3, and features mappable eUSCI peripherals-four UART, six SPI, and two I²C interfaces-configured via port mapping registers without hardware reconfiguration.

Key Specifications

Pinout & Package

128-pin LQFP (PEU) package, 20 mm × 14 mm body size, with exposed thermal pad (not electrically connected). Pin 1 marked by dot; pins numbered counterclockwise. Requires external connection between VDSYS1–VDSYS2 and VASYS1–VASYS2 pairs for proper subsystem biasing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67661IPEU, the MSP430F67651IPEU trades flash capacity for lower BOM cost while retaining full 3-phase metrology capability; versus MSP430F67451IPEU, it adds two dedicated SD24_B channels essential for neutral current monitoring and residual fault detection in 4-wire systems.

Availability

MSP430F67651IPEU is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, utility AMI deployments, and industrial sub-metering systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for revenue-critical applications.

Supply support for MSP430F67651IPEU 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.

The MSP430F67651IPEU belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade electricity meters that demand metrology accuracy, regulatory compliance, and ultra-low-power operation under intermittent AC supply conditions.

FAQ

What is the maximum dynamic range and accuracy of the MSP430F67651IPEU for energy measurement?

The MSP430F67651IPEU achieves <0.1% measurement error over a 2000:1 dynamic range for phase current, validated per ANSI C12.20 and IEC 62053-22 standards. This performance is enabled by its six 24-bit sigma-delta ADCs with programmable gain, internal reference stability, and temperature-compensated digital calibration routines executed in firmware.

Does the MSP430F67651IPEU support neutral current measurement?

Yes, the MSP430F67651IPEU supports neutral current measurement via its SD3P0/SD3N0 differential input pair-a dedicated seventh sigma-delta channel configured for neutral conductor sensing. This enables residual current detection, unbalanced load analysis, and compliance with IEC 62053-23 for 4-wire star-connected meters.

What low-power modes are available on the MSP430F67651IPEU and their typical current draw?

The MSP430F67651IPEU offers LPM3 (2.1 µA at 3 V), LPM3.5 (0.34 µA at 3 V for RTC-only operation), and LPM4.5 (0.18 µA at 3 V for full shutdown with backup RAM retention). All modes retain SRAM content and support wake-up in <5 µs, critical for maintaining timekeeping and tamper logs during AC mains failure.

How many communication interfaces does the MSP430F67651IPEU integrate, and how are they configured?

The MSP430F67651IPEU integrates six enhanced Universal Serial Communication Interfaces (eUSCI), configurable as four UART, six SPI, or two I²C instances via port mapping registers. This flexibility allows concurrent use of optical port (UART), PLC modem (SPI), and HART interface (UART) without external bus switches or protocol translators.

Is the MSP430F67651IPEU pin-compatible with other devices in the MSP430F676x1 family?

Yes, the MSP430F67651IPEU shares identical 128-pin LQFP (PEU) packaging, pinout, and peripheral mapping with all MSP430F676x1 variants (e.g., MSP430F67661IPEU, MSP430F67671IPEU). Firmware and PCB designs are interchangeable across this family-only flash/RAM size and SD24_B channel count differ.