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SMARTAG1 n.m. notation meaning

isaacseeto
Associate III

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.

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Andrew Neil
Evangelist III

You mean these:

AndrewNeil_0-1727948310036.png

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:

AndrewNeil_1-1727948535629.png

 


@isaacseeto wrote:

 what purpose do these components serve if populated?


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

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Andrew Neil
Evangelist III

You mean these:

AndrewNeil_0-1727948310036.png

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:

AndrewNeil_1-1727948535629.png

 


@isaacseeto wrote:

 what purpose do these components serve if populated?


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