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HDC1080: Connection of NC pins

Part Number: HDC1080

Dear TI experts,

My customer checks specification of HDC1080 for their new project.

I the datasheet, there are NC pins (pin3 and pin4) and the description is as below;

So my question is, What is the better connection? left floating? or connected to GND?

Please check this issue. Thanks.

Best regards,

Chase