原标题：TI MSP430F6779 SoC多相电表解决方案

　　TI公司的MSP430F677x是多相电表系统级芯片(SoC), 采用低功耗MSP430 CPU和32位乘法器来实现所有的能量计算和计量应用如收费标准管理,以及和AMR或AMI模块的通信.在2000:1动态范围内精度优于0.1%,满足或超过ANSI C12.20和IEC 63053标准,支持多种传感器如电流变压器, Rogowski线圈或并联分流.本文介绍了MSP430F677x主要特性, MSP430F677xIPEU, MSP430F676xIPEU和MSP430F674xIPEU以及MSP430F677xIPZ, MSP430F676xIPZ和MSP430F674xIPZ功能框图, 三相四线星形连接图,评估模块EVM430-F677主要特性,电路图和材料清单.

　　The Texas Instruments MSP430F677x family of polyphase metering SoCs are powerful highly integrated solutions for revenue meters that offer accuracy and low system cost with few external components. The F677x family of devices uses the low-power MSP430 CPU with a 32-bit multiplier to perform all energy calculations, metering applications such as tariff rate management, and communications with AMR and AMI modules.

　　The F677x devices feature TI’s 24-bit sigma-delta converter technology, which provides better than 0.1% accuracy. Family members include up to 512KB of flash, 32KB of RAM, and an LCD controller with support for up to 320 segments.

　　The ultra-low-power nature of the F677x devices means that the system power supply can be minimized to reduce overall cost. Lowest standby power means that backup energy storage can be minimized and critical data retained longer in case of a mains power failure.

　　The F677x family of devices executes the TI energy measurement software library, which calculates all relevant energy and power results. The energy measurement software library is available with the F677x devices at no cost. Industry standard development tools and hardware platforms are available to speed development of meters that meet all of the ANSI and IEC standards globally.

　　MSP430F677x主要特性:

　　图1. MSP430F677xIPEU, MSP430F676xIPEU和MSP430F674xIPEU功能框图

　　图2. MSP430F677xIPZ, MSP430F676xIPZ和MSP430F674xIPZ功能框图

　　图3. MSP430F677x三相四线星形连接图

　　三相四线电表评估模块EVM430-F6779

　　This EVM430-F6779 is a three-phase electricity meter evaluation module based on the msp430f6779 device. The E-meter has inputs for three voltages and three currents, as well as an additional connection to setup anti-tampering. It allows a customer to test the new MSP430F677x/F674x/F676x/F677x1/F674x1/F676x1 series and see the accuracy result, wide dynamic range achieved, and ease of calibration. The easy-to-use Energy Library provides metrology software for fast startup with this EVM. The software is also programmable for any user’s needs.

　　图4.评估模块EVM430-F6779外形图

　　评估模块EVM430-F6779主要特性:

　　• Supports shunts/current transformers for current sensors

　　• Less than 0.1% error in accuracy for 2000:1 dynamic range

　　• Flexible and isolated sources for MSP430F6779

　　• 320 segment LCD display

　　• 32kHz RTC support

　　• Two LEDs and two headers for active energy and reactive energy pulses

　　• Support for anti-tamper detection

　　• PC communication to MSP430F6779 via RS-232

　　• Software installed for measuring metering parameters

　　• PC-based GUI for calibration/results via MSP430F6779

　　• JTAG connections for simultaneous debug

　　图5.评估模块EVM430-F6779主要元件分布图

　　图6.三相电表中每一相的连接图

　　评估模块EVM430-F6779材料清单: