原标题：Maxim 71M6543F第四代多相电表解决方案

　　Maxim公司的71M6543F/71M6543H是Teridian第四代多相电表系统级(SoC)芯片,包括有5MHz 8051兼容的MPU核,低功耗的带温度补偿的RTC,64KB闪存,5KB RAM和LCD驱动器, 并集成了22位delta-sigma ADC,七个模拟输入端,数字温度补偿,精密的基准电压和32位计算引擎,器件只需极少数的外接元件.在2000:1电流范围内精度为0.1%,超过EC 62053/ANSI C12.20标准,主要用于商业和工业电表.本文介绍了71M6543F主要特性, 功能方框图, AFE功能方框图以及采用三个遥控与一个本地传感器和电流变压器的系统框图.

　　The 71M6543F/71M6543H are Teridian’s 4th-generation polyphase metering systems-on-chips (SoCs) with a 5MHz 8051-compatible MPU core, low-power real-time clock (RTC) with digital temperature compensation, flash memory, and LCD driver. Our Single Converter Technology® with a 22-bit delta-sigma ADC, seven analog inputs, digital metrology temperature compensation, precision voltage reference, and a 32-bit computation engine (CE) supports a wide range of metering applications with very few external components.

　　The 71M6543F/71M6543H support optional interfaces to the 71M6xx3 series of isolated sensors that offer BOM cost reduction, immunity to magnetic tamper, and enhanced reliability. The ICs feature ultra-low-power operation in active and battery modes, 5KB shared RAM, and 64KB of flash memory, which can be programmed with code and/or data during meter operation. High processing and sampling rates combined with differential inputs offer a powerful metering platform for commercial and industrial meters with up to class 0.2 accuracy (71M6543H).

　　A complete array of code development tools, demonstration code, and reference designs enable rapid development and certification of meters that meet all ANSI and IEC electricity metering standards worldwide.

　　71M6543F主要特性:

　　• 0.1% Accuracy Over 2000:1 Current Range

　　• Exceeds IEC 62053/ANSI C12.20 Standards

　　• Seven Sensor Inputs with Neutral Current Measurement, Differential Mode Selectable for Current Inputs

　　• Selectable Gain of 1 or 8 for One Current Input to Support Shunts

　　• High-Speed Wh/VARh Pulse Outputs with Programmable Width

　　• 64KB Flash Memory, 5KB RAM

　　• Up to Four Pulse Outputs with Pulse Count

　　• Four-Quadrant Metering, Phase Sequencing

　　• Digital Temperature Compensation:

　　Metrology Compensation

　　Accurate RTC for TOU Functions with Automatic Temperature Compensation for Crystal in All Power Modes

　　• Independent 32-Bit Compute Engine

　　• 46-64Hz Line Frequency Range with the Same Calibration

　　• Phase Compensation (7)

　　• Three Battery-Backup Modes: Brownout Mode LCD Mode Sleep Mode

　　• Wake-Up on Pin Events and Wake-on-Timer

　　• 17mW Typical Consumption at 3.3V, 1μA in Sleep Mode

　　• Flash Security

　　• In-System Program Update

　　• 8-Bit MPU (80515), Up to 5MIPS

　　• Full-Speed MPU Clock in Brownout Mode

　　• LCD Driver: 6 Common segment drivers Up to 56 selectable pins

　　• Up to 51 Multifunction DIO Pins

　　• Hardware Watchdog Timer (WDT)

　　• I2C/MICROWIRE™EEPROM Interface

　　• SPI interface with Flash Program Capability

　　• Two UARTs for IR and AMR

　　• IR LED Driver with Modulation

　　• Industrial Temperature Range

　　• 100-Pin Lead-Free LQFP Package

　　图1.71M6543F功能方框图

　　图2.71M6543F AFE功能方框图

　　图3.采用三个遥控和一个本地传感器的系统框图

　　图4.采用电流变压器的系统框图