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DS18B20 Digital Thermometer


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. CityTech BD 


  1. Unique 1-Wire® interface requires only one port pin for communication
  2. Each device has a unique 64-bit serial code stored in an onboard ROM
  3. Multidrop capability simplifies distributed temperature sensing applications
  4. Requires no external components
  5. Can be powered from data line. Power supply range is 3.0V to 5.5V
  6. Measures temperatures from –55°C to +125°C (–67°F to +257°F)
  7. ±0.5°C accuracy from –10°C to +85°C
  8. Thermometer resolution is user-selectable from 9 to 12 bits
  9. Converts temperature to 12-bit digital word in 750ms (max.)
  10. User-definable nonvolatile (NV) alarm settings
  11. Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
  12. Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system. CityTech BD 
General Specification
Operating supply voltage3 to 5.5 volts
Digital outputResolution 9 to 12 bits
Temperature measurement ranges-55°C to +125°C, ( accurate to 0.5°C.)
Maximum conversion time and response750 ms
Length (mm)19
Width (mm)15
Height (mm)6
Weight (gm)9
Shipment Weight0.005 kg
Shipment Dimensions3 × 3 × 3 cm


Package Includes:

1 x DS18B20 Digital Thermometer

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