I am not sure the reason for using a supercap to power a hardware clock. Maybe there cheap and it was to save money. Seems like negligence on the designers. Is there a way to replace it with a battery or something that will last a few weeks between power ups?. This is not an Orin. My AGX is ran where there is no networking which means I have to hand set the time on every boot. This is a very poor design for something so expensive.
I have rtc0 set as default but it fails if the power is disconnected for more than a couple minutes
Latest Jetpack installed.
Maybe try sync to your phone from hotspot.
A cheap DS3231 RTC module should do the trick. Since the oscillator in this rtc is temperature compensated it is more precise than the Jetson built-in RTC.
Example Link:
I have done that but not always an option.
I use a battery version on my pie units in the field and they work well. For a many thousand dollar computer you think it would have a working reliable rtc.
If I solder in a 3v Lithium magnesium battery is there anything else I need to do? Add remove diode etc or change anything in software?
Xavier is designed to use a supercap or a rechargable cell. A standard coin cell must not be charged at all - it will explode otherwise. So a diode is required for a coin cell, and you may need to disable charging through VBAT in the device tree.
I suggest using an external rtc module like the one in the link I posted. No soldering required, only modifying the device tree to load the rtc driver, which is part of the standard linux kernel.
I have a maxwell ml2032 Rechargeable. I will give that a go. If not then I will hook up one of the rtc units I use for my pie field projects.
Sure, you can use a rechargable coin cell for that as said in Xavier module datasheet below:
The following backup cells may be attached to this pin:
Super Capacitor (gold cap, double layer electrolytic)
Standard capacitors (tantalum)
Rechargeable Lithium Manganese cells
The backup cells must provide a voltage in the range 2.5V to 3.5V.
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