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The HTU21D sensor is a self-contained humidity and temperature sensor that is fully calibrated during manufacture.  The sensor can operate from 1.5V to 3.6V, has selectable resolution, low battery detect, and checksum capability. The HTU21D has a low power stand-by mode for power-sensitive applications.


  • Measures relative humidity from 0% to 100%
  • Measures temperature from -40°C to 125°C
  • I2C communication
  • Fully calibrated
  • Fast response time
  • Selectable resolution
  • Very low power consumption  


  • 0% to 100% relative humidity range
  • -40°C to 125°C temperature range
  • Very low power consumption
  • Operates from 1.5V to 3.6V
  • Fast response time – 5 seconds typical
  • Built-in heater for fast recovery from saturation
  • Recovers fully from condensation
  • Fast conversion time – 14ms typical  


  • 20-pin Xplained Pro compatible connector
  • I2C interface
  • Xplained Pro Hardware identification Chip
  • Atmel Studio 6 Project available for download
  • µC C code available for download
  • Selectable 8-12 bit resolution for humidity
  • Selectable 12-14 bit resolution for temperature  

Please review product documents or contact us for the latest agency approval information.  

Product Type Features

  • Product Type  Xplained Pro

  • Sensor Type  Humidity

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