How do I configure the PMIC MAX20024 for my backup super capacitor?


In the OEM Product Design Guide for the AGX XAVIER SoM the usage of a RTC backup is mentioned as optional.
Further it is said, that the SoM-side PMIC (MAX20024) needs to be configured for such an implementation.

How do I do that?

E.g.: Max. voltage rating = 3.3 V / ESR = 200 Ohm / C = 0.2 F / Max. charged voltage = 2.8 V

Thanks in advance.

PS: The datasheet of the PMIC is not available at MaximIntegrated; it also seems to be EoL. :(
PPS: Here in the forum, one said, that there might be a RTC backup on the SoM too? Can one confirm this?

Need to check will reply later due to CNY.

You can configure it by modify the status to okay in the …/hardware/nvidia/platform/t19x/galen/kernel-dts/common/tegra194-spmic-p2888-0001.dtsi

backup-battery {
                                backup-battery-charging-current = <100>;
                                backup-battery-charging-voltage = <3000000>;
                                backup-battery-output-resister = <100>;
                                status = "disabled";

Thank you,

As a newbie to this platform, this is very appreciated. :)

Best Regards.