DS18B20-One Wire Digital Temperature Sensor

Description: 

The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile  user-programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range  of  -55°C  to  +125°C  and  is  accurate  to ±0.5°C  over  the range  of  -10°C  to  +85°C.  In addition, the DS18B20 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply. 

Each  DS18B20 has a unique 64-bit serial code, which  allows  multiple  DS18B20s  to  function  on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control  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
• Package:TO-92

Documents:

• Datasheet