Hello, I am using JetPack 4.6.3 (L4T 32.7.3 ) on Jetson AGX Xavier device. Surprisingly, the voltage across the supercapacitor (C512) is always 0 V (whether turned on or off). It was suggested here to enable the “backup-battery” by the device tree. I did it but had no success. The “backup-battery”…

Looks like board issue. You can run RMA for it.

Thanks a lot. I will update you once done!

@Trumany Thank you for waiting. I received the Rechargeable Lithium CMOS Battery (ML1220 3V). So I am going to solder on the terminals as shown here Do I need to remove/de-solder the super capacitor or let it be there as it is?

Yes, please remove the super capacitor first.

@Trumany I removed the super cap and soldered the battery. I measured 2.7V across the battery’s terminal. Later on, I powered on the device and plugged LAN cable to get the correct time, as shown below: $ timedatectl Local time: Tue 2023-05-09 19:51:35 JST U…

What’s battery voltage level when you turned off the device?

[image] Trumany: What’s battery voltage level when you turned off the device? 2.587V

Could you disable tegra RTC to confirm. rtc@c2a0000 { status = "disable"; };

[image] ShaneCCC: Could you disable tegra RTC to confirm. Thanks a lot but how to do that?

Modify the “rtc@c2a0000” to disable in device tree.

@ShaneCCC @Trumany [image] ShaneCCC: Could you disable tegra RTC to confirm. Yes, I did it. But the problem persists. Please see below for additional details. device-tree showing battery status$ dtc -qqq -I fs -O dts /proc/device-tree | grep -A 1 backup-battery backup-battery { bac…

Supercapacitor shows 0V even when powered on

Robotics & Edge Computing Jetson Systems Jetson AGX Xavier

RaviJoshi May 10, 2023, 1:26am 12

2.587V

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Supercapacitor shows 0V even when powered on

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