LTC1687 unconnected pins

Hello,

I am trying to integrate the LTC1687 into an existing design as replacement. The pinout matches to my footprint except of pin 13. On my design, Pin 13 is connected to VDD like pin 14.

The LTC1687 datasheet says that pin 13 has "no connection".

My question is:

Am I allowed to connect pin 13 with pin 14, or is there any internal connection on pin 13 which is only used for factory calibration, testing or something?

Is this pin internally fully  unconnected?

I would be very helpful if someone can answer me that question.

Best regards

Mathias

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