Texas Instruments MSP430F67651IPEUR

Overview

MSP430F67651IPEUR 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 <0.1% energy measurement accuracy over 2000:1 dynamic range. It integrates LCD controller (320 segments), RTC with temperature compensation, anti-tamper security modules, and supports ANSI C12.20 and IEC 62053 compliance.

For engineers reviewing the MSP430F67651IPEUR datasheet, MSP430F67651IPEUR pinout, MSP430F67651IPEUR application, or MSP430F67651IPEUR equivalent, key selection criteria include its 128-pin LQFP package, ultra-low-power LPM3.5 mode (0.34 µA), dedicated pulse output pins for active/reactive energy calibration, and support for current transformers, Rogowski coils, or shunt-based sensing in revenue-grade metering systems.

Technical Context

The MSP430F67651IPEUR implements a 25-MHz ultra-low-power CPU with 32-bit hardware multiplier to execute TI's energy measurement software library, enabling real-time tariff management and AMR/AMI communication. Its analog front end includes six independent SD24_B sigma-delta modulators with differential inputs and programmable gain, plus a system 10-bit ADC for supply/temperature monitoring.

It features seven eUSCI modules configurable as UART, SPI, or I²C interfaces, four 16-bit timers with nine capture/compare registers, and dual power domains (AVCC/DVCC) with auxiliary supplies (AUXVCC1–3) for backup subsystem operation during AC mains failure - supporting <3 µA LCD operation in LPM3.

Key Specifications

Pinout & Package

The MSP430F67651IPEUR is housed in a 128-pin LQFP (PEU) package with 20 mm × 14 mm body size, industrial temperature range (–40°C to +85°C), and 90 general-purpose I/O pins. Power domains are segregated: AVCC/AVSS for analog, DVCC/DVSS for digital, VDSYS/VASYS for system supplies, and AUXVCC1–3 for backup subsystems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67661IPEUR, the MSP430F67651IPEUR offers lower flash capacity but identical metrology performance and pin compatibility; compared with MSP430F67651IPZ, it provides 28 additional I/Os and full analog channel support in the same 128-pin footprint - critical for high-channel-count meter designs.

Availability

MSP430F67651IPEUR is available at Aetrix Electronics and suitable for 3-phase revenue metering, industrial energy monitoring, and AMI endpoint node applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F67651IPEUR 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 decades of leadership in ultra-low-power microcontrollers and metrology solutions.

The MSP430F676x1 product line is engineered specifically for revenue-grade polyphase electricity metering, integrating metrology-grade analog front ends, secure real-time processing, and low-power system management to minimize bill-of-materials and certification effort.

FAQ

What is the maximum dynamic range and accuracy specification for energy measurement in the MSP430F67651IPEUR?

The MSP430F67651IPEUR achieves <0.1% measurement error over a 2000:1 dynamic range for phase current, verified per ANSI C12.20 and IEC 62053 standards. This performance is enabled by its six 24-bit sigma-delta ADCs with digital phase correction and temperature compensation, ensuring Class 0.2 metering accuracy across temperature and line frequency variations from 40 Hz to 70 Hz.

Does the MSP430F67651IPEUR support hardware pulse outputs for active and reactive energy calibration?

Yes, the MSP430F67651IPEUR includes dedicated pulse output pins (PULSE_A and PULSE_R) that generate hardware-synchronized active and reactive energy pulses. These outputs are fully configurable in frequency and duty cycle, enabling direct connection to calibration equipment without CPU intervention - a requirement for ANSI and IEC type-test procedures.

What low-power modes are available on the MSP430F67651IPEUR, and what is the current draw in RTC-only operation?

The MSP430F67651IPEUR supports LPM3.5 (RTC mode) with a typical current draw of 0.34 µA at 3 V. In this mode, only the RTC, backup RAM, and tamper-detect circuitry remain active while the CPU, flash, and most peripherals are powered down - enabling >1-year operation on a single CR2032 coin cell during AC mains failure.

How many independent sigma-delta ADC channels does the MSP430F67651IPEUR integrate, and what is their resolution?

The MSP430F67651IPEUR integrates six independent 24-bit sigma-delta ADCs (SD24_B modules), each supporting differential inputs and programmable gain. These are used for simultaneous voltage and current sampling across three phases and neutral, delivering metrology-grade resolution without external signal conditioning.

Is the MSP430F67651IPEUR pin-compatible with other devices in the MSP430F676x1 family?

Yes, the MSP430F67651IPEUR shares identical pinout and package (128-pin LQFP PEU) with all other MSP430F676x1 variants including MSP430F67661IPEUR and MSP430F67671IPEUR. This allows hardware reuse across different flash/RAM configurations while maintaining full functional compatibility in meter designs.