While reviewing the reference design for the TI CC2541EM 2-layer board, and the associated parts list, I noticed one component (C254) states "DNM - Do Not Mount".
What is the reason for this? Why even draw this on the schematic if you don't intend the component to be populated? if they go to the trouble to change the schematic to read "DNM", why not just remove the component altogether?
OR, are they using the two unpopulated SMT pads as a capacitor? That seems strange.
OR, is this a placeholder for a cap that would be added later, to properly tune the antenna if needed?