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BQ24190: USB Plug detection

KANJI SHIBATANI
Mastermind 6205 points
Part Number: BQ24190

Hello

 

My Customer intend to have USB Plug insetion detection using REG08 [7:6]  VBUS_STAT is Unknown , REG08[5:4]  CHG_STAT is not charging , and  REG08[2] :Power is Not good.

Is this idea OK?  ( I think this seems no problem , but not confident with.)

It there any special case which satisfy ( unknown / not chargging / power is not good ) except USB plug was unplugged?

Please advise.

Sorry to have such a fundamental question.

Best Regards

 

 

  • 0
    TI__Expert 8230 points
    Hello Kanji,

    You can use these registers to determine if an adapter was plugged in and can provide power to begin charging. The VBUS_STAT register is a good indicator of the type of adapter detected and plugged in. Having said that, if there was an adapter plugged in that has faulty D+/D- lines (for example they are floating and not providing a valid voltage for detection), VBUS_STAT will report this as an unknown adapter but still allow the charger to draw up to 100mA from the adapter.
  • 0 in reply to Fernando Lopez
    Mastermind 6205 points

     

    Dear Mr Dominguez,

     

    Thank you for your quick reply .

    Sorry to my poor English. Please let me confirm again.

     

    <USB Plug Or AC Adapter detection>

    :REG08 [7:6]  VBUS_STAT is Unknown

    :REG08[5:4]  CHG_STAT is not charging

    :REG08[2] :Power is Not good.

     

    I think  the status of " unknown "/ "not chargging" / "power is not good" is  occur when  USB Plug Or Adapter  is unplugged ONLY.

    Is this correct?

    Are there any special case which satisfy ( unknown / not chargging / power is not good )

    except USB plug Or Adapterf was unplugged ?

     

    Customer intend to use bq24190 and  want to fix their  Hardware/Software design.

     

    Please advise

  • 0 in reply to KANJI SHIBATANI
    TI__Expert 8230 points
    Hello Kanji,

    Yes, status of "Unknown/Not Charging/Power is not good" can occur if the is no adapter/adapter unplugged, but it can also occur if an unknown adapter is plugged in, but doesn't pass the poor source detection, which is a test the charger does at plug-in where it tries to sink 30mA from the adapter to determine if it's good.
  • 0 in reply to Fernando Lopez
    Mastermind 6205 points

    Dear Mr Dominguez,

    Thank you for your answer.