DS18B20与单片机的接口及编程技术.pdf

24 4 河 北 工 业 科 技 Vol. 24, No .4 2007 7 H ebei Journal of Industrial Science and Technology July 2007 : 008- 534( 2007) 04-0227- 03 DS 8B20 , ( 石家庄信息工程职业学院计算机系, 河北石家庄 050035) : 介绍了DS 8B20 的性能内部结构及优 性, 并详述了单线数字温度传感器DS 8B20 与 单片机的接口技术以及在温度测量中的硬件和软件设计, 最后以 一个程序实例进行了说明 : DS 8B20; 单总线; 数字温度传感器; 单片机; 网络化 : T P2 2 : A Interface of DS 8B20 w ith single-chip computer and programming technique LIU Jun-fu, ZON G Yun ( Computer Department, Shijiazhuang Information Engineering Vocational College, Shijiazhuang H ebei 050035, China) Abstract: DS 8B20 is a -Wire bus digital thermometer produced by DALLAS Company. It has characteristics of simple inter- face, high accuracy , strong ant-i interference ability , st abilize credibility etc. This paper introduces the int erface technique - Wire bus digital thermomet er DS 8B20 with single-chip computer and its hardw are soft ware design applied in measuring temperature. Finally an example of programming is given. Key words: DS 8B20; -Wire bus; digital thermometer; single chip microcomputer; net worked DS 8B20 DALLAS 1 DS18B20 , , 1. 1 DS18B20 , ( ) , DS 8B20 ) DS 8B20 9- 2 2) , : 3. 0 ~ 5. 5 V DS 8B20 , , 3) : - 55 ~ 25 9 2 DS 8B20 3 2 , 4) 2 ( 0. 062 5 ) DS 8B20 3 T O -92 750 ms ( ) ; - 55~ 25 , 9- 2 5) A/ D , 0. 062 5 , 1. 2 DS18B20 6