Description
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.

FEATUREs
◾ 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
◾ 3x3 mm DFN Package
◾ Excellent long term stability
◾ Optional factory-installed cover
   • Low-profile
   • Protection during reflow
   • Excludes liquids and particulates

APPLICATIONs
◾ HVAC/R
◾ Thermostats/humidistats
◾ Respiratory therapy
◾ White goods
◾ Indoor weather stations
◾ Micro-environments/data centers
◾ Automotive climate control and
   defogging
◾ Asset and goods tracking
◾ Mobile phones and tablets