RS-485全工收发器芯片的设计  

Design of RS-485 full-duplex transceiver chip

作　　者：应建华[1] 郭艳[1] 陈艳[1] 刘毅[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2006年第10期7-10,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：湖北省信息产业专项基金资助项目(05060)

摘　　要：介绍了一种基于CMOS工艺的低功耗RS-485全工收发器芯片的工作原理及其电路与版图的设计.该芯片采用单一5 V供电电源,其待机功耗小于1 nA,采用限摆率技术将最大通信速度降低至250 Kbit/s,最大通信距离提高到400 m,同时满足可带24个负载的要求.芯片内设的短路保护、开路保护、雷击保护、过温保护等电路可保证收发器在恶劣的应用环境下正常工作.This paper introduced a design method of a low power RS-485 bus full duplex transceiver chip based on CMOS. Design of each block was described in detail, layout consideration is also presented in brief. The chip also has the following features, stand by current of 1 nA, maxim data transmission rate of 250 Kbit/s, maxim loads number of 24. The chip has internal short circuit protection, open circuit protection, lightning strike protection and thermal shutdown protection circuits. As the chip is widely used in long distance data communication, the application envirbnment may present a number of serious problems even destroy the whole circuit without internal protection circuits.

关 键 词：全工收发器 短路保护 开路保护 雷击保护 过温保护 

分 类 号：TN431.1[电子电信—微电子学与固体电子学]