The goal of this document is to familiarize the user with the HDC3 family of devices by providing storage and handling guidelines, software configuration examples, and pseudo code. The HDC devices are integrated humidity and temperature sensors. The devices measures humidity through a capacitive polymer dielectric that has the capability to calibrate and restore humidity accuracy to meet product specifications. The HDC3 features a 2.5-mm × 2.5-mm WSON open-cavity package where the sensor is exposed directly to ambient air. On the HDC3021, the sensing element is protected during the assembly by factory-installed PI (Polyimide) tape. The HDC3022 sensing element is protected by a hydrophobic PTFE filter and is an excellent choice for outdoor environments or anywhere condensation is expected. The HDC3021-Q1 is an AEC-Q100 qualified automotive grade humidity sensor. All of these HDC3 family devices are NIST traceable, factory calibrated and software-compatible with each other.