1 wire DS18B20 Temperature Sensor
1.Unique 1 Wire interface requires only one port pin for communcation. Multidrop capability simplifies distrbuted temperature sensing applications.Requires no extenal components 2.Operating temperature range:-55℃ to +125℃， ±0.5℃ accuracy from -10℃ to +85℃ 3. Can be powered from data line. Power supply range is 3.0V to 5.5V 4.Thermometer resolution is programmable from 9 to 12 bits.