The Si7021 I2C Humidity and Temperature Sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I2C Interface.
The patented use of industry-standard, low-K polymeric dielectrics for sensing humidity enables the construction of low-power, monolithic CMOS Sensor ICs with low drift and hysteresis, and excellent long term stability. The humidity and temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no recalibration or software changes required.


  • Precision Relative Humidity Sensor
  • ±3 RH (max), 0–80 RH
  • High Accuracy Temperature Sensor
  • ±0.4 °C (max), –10 to 85 °C
  • 0 to 100 RH operating range
  • Up to –40 to +125 °C operating range
  • Wide operating voltage
  • (1.9 to 3.6 V)
  • Low Power Consumption
  • 150 µA active current
  • 60 nA standby current
  • Factory-calibrated
  • I2C Interface
  • Integrated on-chip heater 

Project details