HDC2010: Need guidance on structural design

Hello Tonyx.wu

You can have an opening or “window” directly above the device, that should not cause any issues, although in some systems the approach in Figure 5 is might be used to get the device farther away external sources that could impact the performance of the device like dust  or certain contaminants.

The other trade off to keep in mind is that positioning with respect to the opening would most likely impact response time, but I would expect the performance should be quite similar to what’s drawn in Figure 5, depending on your mechanical design.

Let us know if there is anything else we can clarify.

Hello Tonyx.wu,

In the application note you are making reference to, “Optimizing Placement and Routing for Humidity Sensors", we don’t have a particular recommendation when it comes a specific measurement for the air gap.

If your design goal is the maximize the response time, then minimizing the air gap, and the shell air volume as much as possible would give the best response time.

Other than that, the only other recommendation we can give is that there should be enough distance between the shell and the sensor, such that the shell doesn’t come in contact with the sensor under any application conditions.