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BQ28Z610: The device reboot due to the low temperature

lishujie
Prodigy 160 points
Part Number: BQ28Z610
Other Parts Discussed in Thread: BQ25792

Hello, we use bq28z610 for the coulometer and bq25792 for the charge chip. The schematics have been checked by ti engineers.

Now I have a problem with the configuration of the BQ28Z610.

About UTD Settings

During the low-temperature test, when I set the value of UTD Threshold to 0°, the whole device would be powered off at 0° and then powered on, and the device would restart. If the UTD Threshold is set to -5°, the whole device will restart at -5°.

When the device reaches the UTD Threshold, why does the whole device power off and power on? We hope that even if the UTD Threshold is reached, the device should not power off and power on.

I tried to write 0x82 in the 0xf register of BQ25792, disable charge, and pull up the CE pin, but it could not be solved. Is there any way to avoid it?

Regards,

lishujie

  • 0
    TI__Mastermind 24741 points

    Hello Lishujie, 

    The UTD should not trigger the gauge to power cycle, please see the image below taken from the TRM. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 160 points

    Hello Jonny

    we have this problem, and the probability is high, the restart time point is when the temperature reaches the UTD Threshold.

    How should we investigate the problem? Could you please help us check the configuration of BQ28Z610 and BQ25792? What configurations may be related to this phenomenon？Looking forward to your reply.

    Regards,

    lishujie

  • 0 in reply to lishujie
    TI__Mastermind 24741 points

    Hello,

    Can you please send over the gg file for the BQ28z610 and the log file associated with this behavior? 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 160 points

    Hello Jonny

    I run two tests:

    case1: I used the EV2300 and a battery and put it in the thermostat, which went from hot to cold to hot again. log : battery1.log

    1588.battery1.log

    case2: I installed the battery on our product, the SDA SCL of the battery is connected to the EV2300, and the TS pin is connected to the bq25792. Again, from high temperature to low temperature to high temperature.In the second test, our device rebooted. log: device&battery.log

    device&battery.log

     

    battery.gg.csv

    Our problem is that when the temperature of the battery reaches the UTD, the whole device has a probability of restarting.

    Please help analyze it, thank.

    Regards,

    lishujie

  • 0 in reply to lishujie
    TI__Mastermind 24741 points

    Hello Iishujie, 

    Is there a particular reason the TS pin is connected to the charger and not to an external thermistor? Additionally, the UTD protection should not be causing the gauge to restart as this is not the operation of the protection, please see the image below taken from the device TRM. 

    How are you determining that the gauge is being restarted? 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 160 points

    Hello Jonny

    TS pin has an external resistor.

    Our main chip is rebooting，It was turned off and turned on.

    If the restart is not caused by UTD, please help check other configurations in the gg file to see if they are affected by other configurations.Thank

    Regards,

    lishujie

  • 0 in reply to lishujie
    TI__Mastermind 24741 points

    Hello Iishujie, 

    My apologies, I thought you were referring to the TS pin on the gauge. I do not think that the UTD gauge is causing the main chip to power cycle. The immediate thing I can think of is that opening the DSG FET when the UTD event is occurring is causing the main chip to power cycle. A test you can do is to manually toggle the DSG FET by command. When you toggle the DSG FET off, if you are noticing that the main chip is still power cycling then this can help narrow down the potential causes. Otherwise if you toggle the DSG FET off and are not observing the main chip power cycle then the gauge is not the cause of this behavior, since when UTD is triggered the only action that is performed is the opening of the DSG FET. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 160 points

    Hello Jonny,

    When FET_EN=0, I reverse the DSG FET by command, and the main chip does not restart.

    Our current practice is to ignore TS on the charge chip bq25792: TS_IGNORE is set to 1. When the temperature reaches UTD, the main chip will not restart.

    What clues can be gleaned from this solution?

    Regards,

    lishujie

  • 0 in reply to lishujie
    TI__Mastermind 24741 points

    Hello Iishujie, 

    This tells me that the UTD is not the cause of the main chip power cycling, and it sounds like this TS on the charger could be causing this behavior. Please continue on the other thread you have active here. 

    Regards, 

    Jonny.