DS18B20 -1 Wire Digital Temperature Sensor

DS18B20is 1-wire digital temperature sensor from Maxim IC suitable with 9 to12 bit precision over the range of operation (-55°C to 125°C) .

With an accuracy of ±0.5°C over the range of -10°C to +85° and multiple data logging of temperature spread in wide area network, connected in single data bus, DS18B20 comes handy as it has been assigned unique 64-Bit Serial Number, thus a single microcontroller can receive data from many DS18B20s distributed over a large area. 

Features:

• Unique 1-Wire® interface requires only one port pin for communication

• Each device has a unique 64-bit serial code stored in an onboard ROM

• 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

• Measures temperatures from –55°C to +125°C (–67°F to +257°F)

• ±0.5°C accuracy from –10°C to +85°C

• Thermometer resolution is user-selectable from 9 to 12 bits

• Converts temperature to 12-bit digital word in 750ms (max.)

• User-definable nonvolatile (NV) alarm settings

• Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)

• Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system

Please follow the link to configure ds18b20 with raspberry pi

        https://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing/hardware

Datasheet:

        http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf