Description The Si7021 I2C Humidity and Temperature Sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements an analog to digitalconverter 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 The Si7021 is available in a 3x3 mm DFN package and is reflow solderable It can be used as a hardware and software compatible drop in upgrade for existing Featuring precision sensing over a wider range and lower power consumption The Si7021 offers an accurate low power factory calibrated digital solution ideal for measuring humidity dew point and temperature in applications ranging from HVAC R and asset tracking to industrial and consumer platforms Specification Power supply 3 5VRelative humidity 3 RH max 0 80 RHTemperature 0 4C max 10 to 85COperating range 0 to 100 RHOperating range Up to 40C to 125 CWide operating voltage 1 9V 3 6VLow power consumption 150 A active currentStandby current 60 nASize 1 3 1cm 0 51 0 39Applications HVAC RThermostats humidistatsRespiratory thera