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BQ24196: BQ24196 doesn't work without Battery.

Terry Tseng
Expert 1075 points
Part Number: BQ24196
Other Parts Discussed in Thread: BQ25892

Dear Tier :

Below show BQ24196.   If take off battery, Vbus can't pass to Vsys.

At BQ25892, it can pass to Vsys without battery.    I would like to know what different between BQ24196 and BQ25892.

  • 0
    TI__Intellectual 960 points

    Hello,

    The bq24196 is able to supply power through the buck converter directly to the SYS, regardless of the presence of a battery, therefore I am unable to replicate this issue without more information.

    In order to help resolve your issue, could you please supply the following:

    1. Are you using the TI EVM for the bq24196? If not, can you upload your schematic?

    2. What is the SYS load?

    3. Are you utilizing this part as a stand-alone device or are you configuring registers? If registers, please upload a list of the current registers at time of issue.

    4. What is your input voltage?

    Regards,

    Parker

  • 0 in reply to ParkerHolloway
    Expert 1075 points

    Hi Quote :

    1. Are you using the TI EVM for the bq24196? If not, can you upload your schematic? 

        Not EVM.   Attached file is schematic, please help to check.

    2. What is the SYS load?

        For processor system

    3. Are you utilizing this part as a stand-alone device or are you configuring registers? If registers, please upload a list of the current registers at time of issue.

        Now I don't have configuring registers

    4. What is your input voltage?

        DC5V

  • 0 in reply to Terry Tseng
    TI__Intellectual 960 points
    Hello,

    I would recommend that you limit the load on the SYS pin until after the voltage on this pin has risen above 2.2 volts during operation with no battery.

    Can you verify that the SYS pin rises above 2.2 volts?

    Parker
  • 0 in reply to ParkerHolloway
    Expert 1075 points
    Hello :

    The Charger current only 1A
    We check the Regist below

    REG08 bit[7-6] shown "01–USB host", not "10–Adapter port"

    Input Current Limit
    REG00 bit[2-0] set 111-3A

    Fast Charge Current Limit
    REG02 bit[2-0] set 011000 = 2048mA

    Please help check what's going on
  • 0 in reply to Terry Tseng
    TI__Intellectual 960 points

    Hello,

    Is this still related to the above question? If it is, I would ask that you please verify that the condition I mentioned above if met (VSYS rise). If not, I'd like to move this to a different thread.

    Thanks,

    Parker

  • 0 in reply to ParkerHolloway
    Expert 1075 points
    Hi

    It is the same question.
    Check REG[08] 0 1 1 0 1 1 0 0
    01 – USB host
    10 – Fast Charging
    1 – VINDPM or IINDPM
    Found VINDPM happen.
  • 0 in reply to Terry Tseng
    TI__Intellectual 960 points

    Hello again,

    Your issue with the device identifying as a "USB Host" input stems from the PSEL pin. In the documentation, as shown below, this pin must be pulled low to indicate an adapter source. Your schematic shows it as pulled high, which puts the device in USB Host mode.

    Since the device is in VINDPM, can you provide the Register 00 setting, as the value of the voltage in DPM setting is important to determining why the device is in VINDPM.

    Parker