DS1820 Temperature Sensor

26 October 2016 User Review

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The DS18S20 digital thermometer provides 9-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18S20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. In addition, the DS18S20 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.


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

  • Multidrop capability simplifies distributed temperature sensing applications

  • Requires no external components

  • Can be powered from data line

  • Zero standby power required

  • Measures temperatures from –55° C to +125° C in 0.5° C increments. Fahrenheit equivalent is –67° F to +257° F in 0.9° F increments

  • Temperature is read as a 9–bit digital value.

  • Converts temperature to digital word in 200 ms (typ.)

  • User–definable, nonvolatile temperature alarm settings

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


  • Thermostatic Controls

  • Industrial Systems

  • Consumer Products

  • Thermometers

  • Thermally Sensitive Systems



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