原标题：TI MSP430F676x1 SoC多相电表参考设计

　　TI公司的MSP430F676x1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0.5%,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MSP430F676x1 SoV主要特性,PZ和PN封装功能图, 三相四线星形连接图以及0.5级三相智能电表参考设计TIDM-THREEPHASEMETER-F67641主要特性,电路图和材料清单.

　　The Texas Instruments MSP430F676x1 polyphase metering SoCs are powerful highly integrated solutions for revenue meters that offer accuracy and low system cost with few external components. The F676x1 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 or AMI modules. The F676x1 features TI’s 24-bit sigma-delta converter technology, which provides better than 0.5% accuracy. Family members include up to 128KB of flash and 8KB of RAM and an LCD controller with support for up to 320 segments. The ultra-low-power nature of the F676x1 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 F676x1 family executes the TI energy measurement software library, which calculates all relevant energy and power results. The energy measurement software library is available with the F676x1 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.

　　MSP430F676x1主要特性:

　　Accuracy <0.5% Over 2000:1 Dynamic Range for Phase Current

　　Meets or Exceeds ANSI C12.20 and IEC 63053 Standards

　　Support for Multiple Sensors Such as Current Transformers, Rogowski Coils, or Shunts

　　Power Measurement for up to Three Phases

　　Dedicated Pulse Output Pins for Active and Reactive Energy for Calibration

　　Four-Quadrant Measurement per Phase or Cumulative

　　Exact Phase Angle Measurements

　　Digital Phase Correction for Current Transformers

　　40-Hz to 70-Hz Line frequency Range Using Single Calibration

　　Flexible Power Supply Options With Automatic Switching

　　Display Operates at Very Low Power During AC Mains Failure: 3 µA in LPM3

　　Real-Time Clock (RTC) Module With Integrated Offset and Temperature Calibration

　　Multiple Communication Interfaces for Smart Meter Implementations

　　High-Performance 25-MHz CPU With 32-Bit Multiplier

　　Up to 128KB of Flash With Single-Cycle Execution

　　Up to 8KB of RAM With Single-Cycle Access

　　Up to Three Independent 24-Bit Sigma-Delta ADCs With Differential Inputs and Variable Gain

　　System Analog-to-Digital Converter (ADC):

　　10-Bit, 200-ksps, Six Channels Plus Temperature Sensor and Supply Measurement

　　Wide Input Supply Voltage Range:

　　1.8 V to 3.6 V

　　Ultra-Low-Power Consumption During Energy Measurement

　　3.0 mW at 10-MHz Operation (3.0 V)

　　Multiple Low-Power Modes

　　Standby Mode (LPM3): 2.5 µA at 3 V, Wakeup in 3 µs (Typical)

　　RTC Mode (LPM3.5): 1.24 µA at 3 V (Typical)

　　Shutdown Mode (LPM4.5): 0.78 µA at 3 V (Typical)

　　LCD Driver With Contrast Control for up to 320 Segments

　　Password-Protected RTC With Crystal Offset Calibration and Temperature Compensation

　　Four Communications Ports

　　Configurable Among Four UART, Three SPI, and One I2C Interfaces

　　Four 16-Bit Timers With Nine Capture/Compare Registers

　　100-Pin LQFP (PZ) Package with 72 I/O Pins

　　80-Pin LQFP (PN) Package with 52 I/O Pins

　　Industrial Temperature Range of –40℃ to 85℃

　　图1. MSP430F676x1 PZ封装功能框图

　　图2. MSP430F676x1 PN封装功能框图

　　图3. MSP430F676x1 三相四线星形连接图

　　0.5级三相智能电表参考设计TIDM-THREEPHASEMETER-F67641

　　This design implements a complete smart meter design using the MSP430F67641 polyphase metering System on Chip. The design meets all requirements for ANSI/IEC Class 0.5 accuracy and the firmware provided calculates all energy measurement parameters. The F67641 SoC features 128KB of on-chip flash plus a 320-segment LCD controller for a single-chip solution to low-cost polyphase meter design challenges.

　　参考设计TIDM-THREEPHASEMETER-F67641主要特性:

　　Low-cost three-phase electricity meter for Class 0.5 accuracy

　　TI Energy Library firmware calculates all energy measurement parameters including active and reactive power and energy, RMS current and voltage, power factor, line frequency, fundamental and THD readings

　　Add-on communications modules for wireless communications standards such as ZigBee®, Wi-Fi®, Wireless M-Bus, and IEEE-802.15.4g. Both 2.4 GHz and Sub-1 GHz.

　　Built-in 160-segment display

　　Powered from three-phase line voltage

　　图4. 参考设计TIDM-THREEPHASEMETER-F67641外形图

　　参考设计TIDM-THREEPHASEMETER-F67641材料清单: