SMARTAG1 n.m. notation meaning

[isaacseeto]

Hi, I was just wondering if someone knew what n.m. meant on the schematic of the SMARTAG1. I assume do not populate but if so what purpose do these components serve if populated?

 

Thanks.

[Andrew Neil]

You mean these:

https://www.st.com/resource/en/user_manual/um2427-how-to-use-the-st-nfc-sensor-tag-evaluation-board-stmicroelectronics.pdf#page=25

Indeed, it is stated in the Bill of Materials that these are not mounted:

 

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@isaacseeto wrote:

 what purpose do these components serve if populated?

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Presumably to accommodate different variants/revisions of the board;  eg, using a different accelerometer?