Maxim 精度达0.1%的多相智能电表SoC解决方案

中心议题：
    *  71M6543F/71M6543H主要特性
解决方案：
    *  Maxim 71M6543H智能电表解决方案

Maxim公司的71M6543F/71M6543H是第四代多相电表系统级芯片(SoC),具有5MHz的8051兼容的MPU内核,带数字温度补偿的低功耗实时时钟(RTC),闪存和LCD驱动器,2000:1电流范围内精度为0.1%,性能超过IEC 62053/ANSI C12.20标准,集成了22位Delta-Sigma ADC,具有七个传感器输入,数字温度补偿,精密的基准电源,以及32位计算引擎(CE),多达4个脉冲输出, 46-64Hz火线频率校准,外接元件很少.本文介绍了71M6543F/71M6543H主要特性, 功能方框图, 智能电表方框图以及两种系统方框图和推荐的外接元器件.

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/71M6543H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/71M6543H功能方框图

图2.智能电表方框图

图3.采用三个远端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

推荐的外接元器件: