BQ3060: one of the batteries has -18mA leakage

Jinxing,

Have you measured the voltage across the senseR to see if it is real? If the gauge is registering 18mA it means it is either reading that value across SRN/SRP pins or the device has not been calibrated. I would not expect leakage to flow through the senseR. You would see leakage as the gauge registering 0Current, but battery voltage is decreasing over time. 

Thanks,

Eric Vos 

I removed all the capacitors connected to senseR,  and i think there is no current flowing the senseR, and i did a test, i exported .gg file and then import .gg file,   the leakage of -18mA became to 0mA, How to explain this phenomenon？

JInxing,

I am not sure what you mean by removed the capacitors (I assume you left the senseR and a path to the gauge). It sounds like there was a calibration issue which was causing a ghost offset. If you see it again, please just try to re-calibrate the device.

Thanks,

Eric Vos

removed the capacitors means that i removed the filter capacitors of SRN/SRP pins,  I did re-calibrate current before, and the leakage didn't change（-18mA）,and i just export .gg again, the the leakage of -18mA became to 0mA. I am worried about this issue, because i don't know the reason 

removed the capacitors means that I removed c12,c13,c15 in the picture you posted, and the leakgage didn't change. you mentioned calibration may not correct, you mean the current calibration, right? how to calibration in detail？How much accuracy should be controlled？

Hello Jinxing,

Calibration should always be done before testing the gauge, you can use the app note on the product page: https://www.ti.com/lit/pdf/slua502

Sincerely,

Wyatt Keller

Hi, I i did the current calibration at the beginning，I want to how does leakage current happen? and why as long as I import the .gg file again, the leakage current disappears（it shows 0mA ）？