HDC2022 Humidity & Temperature Digital Sensor Texas Instruments HDC2022 Humidity and Temperature Digital Sensor is an integrated sensor with a factory-installed PTFE membrane cover over the opening of the relative humidity sensor. The cover is a hydrophobic microporous PTFE foil that protects against dust and water according to IP67 specifications. The cover is designed to adhere to the package over lifetime operation while maintaining the same response time as a sensor without the membrane. The Texas Instruments HDC2022 cover has a filtration efficiency of 99.99% down to a particle size of 100nm.