Is VCC_RTC optional? Is the function just to provide power for RTC? Why use 80,000uF capacitor?What to do if we don’t use it?
yes, this is optional, this pin used to provide back-up power for RTC.
please access Jetson AGX Xavier OEM Product Design Guide via download center.
you may check [Table 5-1. Power and System Pin Descriptions] for more details,