DS18B20在外形上和三极管很像，有三只脚。电压范围为3.0 V至5.5 V 无需备用电源 测量温度范围为-55 至+125 ℃ 。温度传感器可编程的分辨率为9~12位 温度转换为12位数字格式最大值为750毫秒 用户可定义的非易失性温度报警设置 应用范围包括恒温控制，工业系统，消费电子产品温度计，或任何热敏感系统。 -DS18B20 in form and in transistor like, there are three legs. Voltage range of 3.0 V to 5.5 V without standby power measurement temperature range of-55 to+125 ℃. Programmable temperature sensor has a resolution of 9 ~ 12-bit temperature is converted to 12-bit digital format for a maximum of 750 ms user-definable nonvolatile temperature alarm setting range of applications, including temperature control, industrial systems, consumer electronics, thermometers, or any heat-sensitive system.