Orin NX RTC battrey power off Instantaneous power consumption

I measured the RTC current of orin nx and found that the module would draw 14x uA current from the battery in an instant, and then maintain it at around 14uA. I used a CR2032 battery 230mA/h. After turning the test version on and off 1000 times, the battery The battery will be completely out of power. This means that when using a CR2032 battery, the battery will be completely discharged when the power is turned on and off more than 1,000 times. I have done experiments., Please tell me how to solve this problem.

Hi peng.jack3,

Are you using the devkit or custom board for Orin NX?
What’s your Jetpack verison in use?

Could you share the full dmesg for further check?

and also the steps how you run the on/off test?

devkit & custom board same problem, jetpack version 5.1.1, dmesg no error, this is HW problem. What I want to ask is whether it is normal for RTC to draw 14XuA from the battery at the moment of shutdown?
on/off 1000 time script is Our software is developed by ourselves and cannot be published, please forgive me.

A peak current during power on/off test is normal as there are capacitors on the line.
You can try adding a series 1k resistor as below.

I have added this resistor to the measured result. I tested the RTC battery by turning it on and off about 70 times, and the battery was completely discharged, and the measured battery power was close to 0V.

The peak current should be lower in this situation. What’s the current value?

The measured peak current is approximately 14x uA

Both are 14x uA with or without 1k resistor?

same, Max. will to 14x uA.

Then it is weird with only 70 times vs. 1000 times… anyway, as said, the peak current is reasonable as there are capacitors.

1000 times is we software script, 70 times is manual testing

Please tell me what is the design of this capacitor? What will happen if this capacitor is removed?

The capacitors on module can not be removed. The VBAT is for RTC in power off mode, not for the use case you tested. If the working current of RTC is ~12uA, then it has no problem.

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