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RTC_Vss pin connection

Hi,

I’m posting the following requirement related to the RTC_Vss pin connection.

 In datasheet I can see the RTC power module is isolated.

 

And in the Hardware Checklist :

http://processors.wiki.ti.com/index.php/OMAP-L13x_/_C674x_/_AM1x_Schematic_Review_Checklist

 I can see that RTC_Vss connection to Vss is only mentioned when pin is not used.

Can RTC_Vss be connected to the general VSS or does it have to be connected to a dedicated Vss reference?

THANKS

Silvio

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