I have designed a new carrier board of ORIN core board. Sometimes ORIN can enter the system when it is powered on, but sometimes it cannot, and the core board does not heat up when it cannot enter the system. Because the related circuit of the core board only modified the RTC pin to the D37 pin according to the latest design requirements, I tried to release power from the RTC capacitor and disconnect the charging circuit. The system is powered on properly. I suspect it has something to do with the function of D37 pin. Do you need additional configuration for D37 pin when making RTC? What are the requirements for hardware circuit?
The relevant circuits are as follows:
Hi,
The charging of the ultracapacitor in my circuit is completed by the 3.3V power supply and does not require the D37 pin to charge, so I think the principle of my circuit is the same as that of the reference circuit.
Hi，
I modified the circuit to match the reference circuit but still couldn’t access the system. Then I used the adjustable power supply to power the D37 pin directly before powering the system. When the voltage of D37 pin exceeds 1.8V, the machine cannot enter the system normally. May I ask why?
Early Jetson AGX Orin DevKits may come with modules and carrier boards that were built prior to a pinout change involving pins D37 (was RSVD, now PMIC_BBATT) and L53 (was VCC_RTC, now SYS_VIN_SV). Using an older module in a current design, or a new module in an older DevKit carrier board can cause issues.
Old module in current carrier board design: If the current carrier board design connects a back-up battery or Supercap to the PMIC_BBAT pin on pin D37, one of the SoC pins, connected to that pin can be damaged.
New module in old DevKit carrier board: If the carrier board has a battery connected to the RTC back-up battery connector, the supply will not be routed to the Power Sequencer RTC back-up pin. The RTC back-up functionality will not be supported. Instead, the battery voltage will be applied to the SYS_VIN_SV pin which is not used on the new module. No damage will occur, and the system will function normally except that the RTC back-up will not work.
I should use the new version of the core board. When the adjustable power supply is used to provide 1.79V voltage to the D37 pin, the RTC time will be modified after normal entry into the system. After restarting the machine, the RTC time will not change. If no power is supplied to the D37 pin, change the RTC time after entering the system normally. After the machine is restarted, the RTC time will change.
Please double confirm if it is early module, can you share the part number? Pin D37 should not affect like this with current version module. There is no other requests on the pin design.
A05 is new version module.
No clue on this, RTC pin should not be able to affect system like this…
Do you have a carrier board of devkit to see if this module will hit same issue on devkit?
A05 is new version module.
No clue on this, RTC pin should not be able to affect system like this…
Do you have a carrier board of devkit to see if this module will hit same issue on devkit?
Hi
The cause of the problem is that the 20V and 5V cannot be powered on at the same time. The 5V must be delayed for a period of time.
However, I have found a new problem, it may be that my battery capacity is too small and the RTC voltage drops quickly.
So I want to confirm what is the normal current of ORIN’s RTC power supply?
