The theories, function feature and timing graphic of DS18B20, which is a 1-wire digital thermometer pro-duced by DALLAS company, are introduced. Software program examples of DS18B20 with single chip microcomputer aregiven.

• 文章简要介绍了DALLAS公司生产的一线式数字温度传感器DS18B20的基本原理、功能特点及工作时序，给出了DS18B20与单片机接口的软件编程实例。