https://devzone.nordicsemi.com/f/nordic-q-a/105055/npm1100-qda-pinout-documentation-fixedAfter reviewing the various reference designs from the infocenter, download sections, and the datasheet, I believe the use of Pin 18 on the QFN package of the nPM1100-QDA has yet to be cleared up. Referencing a past devzone post: It appears that thisen-USTelligent Community 13Mon, 30 Oct 2023 14:01:53 GMThttps://devzone.nordicsemi.com/thread/453065?ContentTypeID=1Mon, 30 Oct 2023 14:01:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2b2b71bb-2fc4-4122-82bc-7c7b6509e3b3ketiljo<p>The center pad has vias as well, but they don&#39;t show properly in the screenshot. The center pad is the main ground connection. Pin 18 is just to improve the top layer ground. It looks like this in Altium Designer:&nbsp;</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1698674495625v1.png" alt=" " /></p> <p></p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/452656?ContentTypeID=1Thu, 26 Oct 2023 15:28:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f437559c-ecc7-4c3a-86b6-2a0ad7688405Colby<p>Howdy&nbsp;<a class="internal-link view-user-profile" href="https://devzone.nordicsemi.com/members/ketiljo">ketiljo</a>,</p> <p>Thank you for the response, that clears up why it is still shown as connected to GND in the reference designs...</p> <p>Is there a reason that a via-in-pad or two can&#39;t be used on the thermal (center) pad in this case?</p> <p>Are there any other design considerations for connecting or not connecting Pin 18 (and the other two NC pins)? I know on some RF designs it is recommended to GND NC pins on some devices so the amount of floating copper is decreased, not sure it makes a big difference here one way or the other, so grounding seems like the only consideration.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/452497?ContentTypeID=1Thu, 26 Oct 2023 10:40:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ab9b9591-5784-48bd-aa7d-6531e0080ce4ketiljo<p>Pin 18 is indeed NC, i.e not bonded or in use. The reason for it to be shown as GND is because of the layout. It improves the grounding if you can connect the center pad to the top layer ground plane via this pin:&nbsp;</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1698316851574v1.png" alt=" " /></p><div style="clear:both;"></div>