Texas Instruments MSP430F67641IPZ

Overview

MSP430F67641IPZ from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electricity meters. It integrates a 25-MHz MSP430 CPU, three independent 24-bit sigma-delta ADCs (±0.5% accuracy over 2000:1 dynamic range), RTC with AUXVCC3 backup, LCD controller (320 segments), and four communication interfaces - all in a 100-pin LQFP package operating from 1.8 V to 3.6 V.

For engineers reviewing the MSP430F67641IPZ datasheet, MSP430F67641IPZ pinout, MSP430F67641IPZ application, or MSP430F67641IPZ equivalent, this device is selected for ANSI C12.20/IEC 63053-compliant smart meter designs requiring ultra-low-power operation (1.24 µA in RTC mode), multi-sensor support (CTs, Rogowski, shunts), and on-chip energy calculation firmware.

Technical Context

The MSP430F67641IPZ implements a dedicated metering subsystem with three synchronized 24-bit SD24_B ADCs feeding a hardware-accelerated energy computation engine compliant with ANSI/IEC standards. Its modulator-based analog front end supports exact phase-angle measurement and digital phase correction for current transformers across 40–70 Hz line frequencies using single-point calibration.

System-level integration includes a dual-power-domain architecture: AVCC/AVSS for precision analog conversion, DVCC/DVSS for digital logic, and isolated auxiliary supplies (AUXVCC1/2/3) enabling RTC operation during AC mains failure. The 128 KB flash and 8 KB RAM execute TI's free energy measurement software library with tariff management and AMR/AMI interface support.

Key Specifications

Pinout & Package

100-pin LQFP (PZ) package with 14 mm × 14 mm body size, thermal pad not exposed. Pin functions include three SD24_B analog input pairs (SD0P0/SD0N0 through SD2P0/SD2N0), dedicated AUXVCC3 supply for RTC backup, LCDCAP for LCD capacitor connection, and multiplexed I/O supporting UART/SPI/I²C, timers, and LCD segment/common outputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67621IPZ, the MSP430F67641IPZ provides double flash/RAM for advanced tariff schemes and firmware updates; versus AD7403-8BSTZ, it delivers full SoC integration eliminating external processing and reducing PCB area and certification effort.

Availability

MSP430F67641IPZ is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, utility metering infrastructure, and industrial energy monitoring systems requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F67641IPZ 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 high-reliability solutions for industrial, automotive, and communications markets.

The MSP430F67641IPZ belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade electricity meters needing certified accuracy, ultra-low-power RTC operation, and integrated firmware for ANSI/IEC compliance.

FAQ

What metrology standards does the MSP430F67641IPZ meet?

The MSP430F67641IPZ meets or exceeds ANSI C12.20 Class 0.5 and IEC 63053 accuracy requirements for active energy measurement across 2000:1 dynamic range. Its 24-bit sigma-delta ADC architecture, digital phase correction, and single-point 40–70 Hz calibration ensure compliance without external trimming components. TI provides reference designs and test reports validating these standards for the MSP430F67641IPZ.

How does the MSP430F67641IPZ handle power loss during metering?

The MSP430F67641IPZ uses a dedicated AUXVCC3 supply rail to maintain RTC operation and retain critical energy registers during AC mains failure. In LPM3 mode, the device draws just 3 µA while driving the LCD, and in RTC-only LPM3.5 mode, consumption drops to 1.24 µA at 3 V - enabling >72-hour backup runtime with typical supercapacitors. The MSP430F67641IPZ also supports fast wake-up (3 µs typical) to resume full metrology functions.

Can the MSP430F67641IPZ support shunt-based current sensing?

Yes, the MSP430F67641IPZ supports shunt-based current sensing via its three 24-bit SD24_B ADCs with programmable gain amplifiers and differential inputs. Each SD24_B channel accepts ±100 mV or ±250 mV full-scale ranges optimized for low-value shunt resistors. The MSP430F67641IPZ includes built-in offset and gain calibration registers, allowing one-time factory calibration to eliminate shunt tolerance errors and thermal drift effects.

What communication interfaces are available on the MSP430F67641IPZ?

The MSP430F67641IPZ integrates four eUSCI modules configurable as up to three UARTs, three SPIs, and one I²C interface - totaling seven serial peripheral instances. These support simultaneous connections to AMR/AMI radios, optical programming ports, and external EEPROMs. All interfaces operate independently with DMA support, and the MSP430F67641IPZ includes dedicated pins for IrDA modulation and hardware flow control to reduce host MCU overhead.

Is development hardware available for the MSP430F67641IPZ?

Yes, Texas Instruments offers the EVM430-F67641 - a fully assembled polyphase electric meter evaluation module featuring the MSP430F67641IPZ, calibrated CT/shunt inputs, LCD display, and communication headers for RS-485, RF, and optical interfaces. The kit includes TI's energy measurement software library, GUI-based calibration tools, and reference schematics compliant with ANSI/IEC test setups - accelerating validation of the MSP430F67641IPZ in production meter designs.