LTC4162-L icharge_jeita_x values keep reseting to default values

I have problem with setting up icharge_jeita_x values. I can set up registers to my custom values, but after short time (milliseconds) they keep rolling back to default values. With other registers I don't have such problem (e.g. LTC4162_CHARGER_CONFIG_BITS_REG with changed en_jeita).

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  • +1
    •  Analog Employees 
    on Nov 6, 2019 5:40 PM over 1 year ago

    Hello,

    You are using the adjustable version, right? LTC4162-LAD? Otherwise you are not able to write to these registers.

    Are you increasing the icharge_jeita_x values or decreasing? Does it happen both ways? When this happens, do other registers reset as well, or just the specific register you are writing?

    Regards,

    Zack

  • I see. I'm using LTC4162EUFD-L42 version. I thought that only voltage is not adjustable - this information is listed in "ORDER INFORMATION" section in datasheet. Information about not adjustable current should be put there.

    Maybe information about non-writable registers for some chip versions should be put in registers description in documentation? It would save me a lot of time.

  • For other people with similar problem there is temporary solution. Charging current can still be controlled via CHARGE_CURRENT_SETTING. JEITA have to be disabled first by setting up EN_JEITA to 0. This is not the best solution - you have to care about battery temperature and change charging current (and voltage) by using alarms and interrupts.

    Of course the best solution is to use proper chip version

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  • For other people with similar problem there is temporary solution. Charging current can still be controlled via CHARGE_CURRENT_SETTING. JEITA have to be disabled first by setting up EN_JEITA to 0. This is not the best solution - you have to care about battery temperature and change charging current (and voltage) by using alarms and interrupts.

    Of course the best solution is to use proper chip version

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