DS18B20世界上第一片支持 “一线总线”接口的温度传感器，“一线器件”体积更小、适用电压更宽、更经济。可以程序设定9-12位的分辨率，精度0.5。-DS18B20 one the world' s first to support the " bus line"　interface of the temperature sensor, " front-line device"　smaller and wider application of voltage, but also economic. Procedures can be set from 9 to 12-bit resolution, accuracy ± 0.5 ° C.