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iMXRT1064 Coin Cell or Supercapacitor usage

Question asked by Nikhil Sawane on Jul 13, 2020
Latest reply on Jul 23, 2020 by Nikhil Sawane



I am working on a project with iMXRT1064. 

I am using a SuperCapacitor as a replacement for a coin cell battery. 

As per indications on the development kit schematic, I connected supercap to VDD_SVNS_IN.


However, the MCU does not start working until the capacitor has been discharged. 

So after use, I have to wait 15 to 20 minutes to get the board running again. 


Looking at the datasheet, i found that VDD_SVNS_IN pin is multi-featured. RTC is one of the feature.

Could it be that this pin is by default set to GPIO which could be a high drain source?

This could explain why the board does not power up till capacitor has been discharged? 


If yes, in order to use a coin cell or supercap, do we need to configure this pin to RTC?


Thank you,