说明：  个人的原理图,值得看一看,效果真的不错的,谢谢
(port pin for communication
Multidrop capability simplifies distributed temperature sensing applications
Requires no external components
Can be powered from data line. Power supply range is 3.0V to 5.5V
Zero standby power required
Measures temperatures from-55°C to +125°C. Fahrenheit equivalent is-67°F to +257°F
±0.5°C accuracy from-10°C to+85°C
Thermometer resolution is programmabl)