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HDC2080: What is DAP of HDC2080 for?

Part Number: HDC2080

Hi team,

What What is DAP of HDC2080 for?

I think DAP is kinds of thermal pad like other devices. But it seems that the heat dissipation doesn't matter for this device. And this DAP shouldn't be connected to GND. 

So I am not sure the role of DAP.

Regards,

Noriyuki Takahashi