I am currently designing a product that uses the Xavier NX SOM along with the P3209 A01 developer board by NVIDIA. I am concerned about the compliance of UL standards that require a series resistor with the battery to limit charge current for the coin cell being used for RTC backup.
I noticed that the dev board that I have mentioned above does not have that series resistor.
Does the Xavier NX SOM has a built-in protection for the coin cell used for RTC backup, and if not, what is the recommended solution to meet the UL requirements for this specific purpose.