SNAS817D June 2021 – November 2024 HDC3020-Q1 , HDC3021-Q1 , HDC3022-Q1
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
The HDC302x-Q1 includes an integrated heater with enough power to enable operation in condensing environments. The heater protects the humidity sensor area by preventing condensation as well as removing condensate. Enabling and disabling of the heater is documented in Table 7-4 and illustrated in Figure 7-26 and Figure 7-27.
The heater is expected to impact the temperature measurement result and the relative humidity measurement result. An IC-based humidity sensor uses the die temperature as an estimate for the ambient temperature. Use of the heater increases the die temperature up to 80°C above ambient temperature (depending on supply voltage). Therefore, accurate measurement results of ambient temperature and relative humidity are not possible when the heater is in operation.
Recognizing that the integrated heater evaporates condensate that forms on top of the humidity sensor is important, but does not remove any dissolved contaminants. This contaminant residue, if present, can impact the accuracy of the humidity sensor. The IP67 rated PTFE permanent filter of HDC3022QQ1 protects the humidity sensor from the condensation and the dissolved contaminants when the condensation is evaporated.