原标题：Holtek HT71D0x动力线数据传输解决方案

　　Holtek公司的HT71D0x是动力线数据收发器, HT71D02内置3.3V稳压器输出, HT71D04内置5.0V稳压器输出, 全系列高压输入电压可达30V. 经由内置数据传输调制接口,可将高压传输在线数据解调并转为3.3V or 5V信号给子系统MCU,亦可将子系统MCU信号调制后转为高压经由传输线传回主系统,适用于诸如烟感器、水表等联网系统产品。本文介绍了HT71D02/HT71D04主要特性,方框图和系统方框图以及应用电路.

　　In systems where a master controller controls a number of individual interconnected subsystems such as found in smoke detector systems, water metering systems, solar energy system etc., the cost of the lengthy interconnecting cabling can be a major factor. By sending data along the power supply lines, the interconnecting cables can be reduced to a simple two line type, thus greatly reducing both cable and installation costs.

　　With a the addition of a few external components, this power line data transceiver device contains all the internal components required to provide users with a system for power line data transmission and reception. Data is modulated onto the power line by the simple reduction of the power line voltage for a specific period of time. Power supply voltage changes can be initiated by the master controller for data reception or initiated by the HT71D0x devices for data transmission. An internal voltage regulator within the device ensures that a constant voltage power supply is provided to the interconnected subsystem units while an internal voltage detector monitors the power line voltage level.

　　HT71D02/HT71D04主要特性:

　　_ Complete Data Transmission on Power Line functions

　　_ High Maximum Input Voltage: 30V

　　_ Integrated Low Dropout Voltage Regulator

　　_ Integrated Voltage Detector for Power Supply Monitoring

　　_ Open drain NMOS drivers for flexible interfacing

　　_ Power and Reset Protection Features

　　_ 8-pin SOP package type

　　_ Minimal external component requirements

　　图1.HT71D02/HT71D04方框图

　　图2.HT71D02/HT71D04系统方框图

　　图3.HT71D02/HT71D04应用电路图