基于HART总线的三线制变送器接口设计  

Design of the Three-wire Transmitter Interface Based on HART Bus

作　　者：崔龙[1] 肖前虎 张涛 王健 

机构地区：[1]杭州电子科技大学电子信息学院,浙江杭州310018 [2]聚光科技(杭州)股份有限公司,浙江杭州310052

出　　处：《中国仪器仪表》2014年第1期59-62,共4页China Instrumentation

摘　　要：目前基于HART总线的变送器多为两线制环路供电型,其要求整机的静态工作电流低于3.5mA,才能保证HART信号不受到影响。此电流的限制使得功耗较大的HART总线仪表难以采用通常的两线制HART接口。本设计中采用HART调制解调器AD5700和电流源DAC芯片AD5420实现了三线制HART接口,释放了3.5mA的功耗限制;并详细介绍了硬件和软件设计,成功实现了通信。Most of transmitters based on HART BUS are two-wire loop-powered, the requirement of the static working current must be blow 3.5mA, in order not to affect the HART signal. The limit of current makes it hard to adopt the universal two- wire HART interface for some instruments with High-power consumption. The design introducedHART modem AD5700 and current source DAC chip AD5420, and achieved three-wire HART interface, so the requirements of the 3.5mA limit was relaxed. The design of the hardware and the soft are discussed in detail, and communication are successfully achieved.

关 键 词：HART 三线制 变送器接口 AD5700 AD5420 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]