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BQ25616EVM: How to action OTG and Charger detection?

SangHwan Nam
Prodigy 10 points
Part Number: BQ25616EVM
Other Parts Discussed in Thread: BQ25616, BQ25618, BQ25619, BQ25619EVM, BQ25606

Hello.

I tested by bq25616EVM about OTG mode. but something is I can't understood.

I need two action in 1USB port.
If charger connected then action to battery chaging mode.
If device connected then action to battery boost mode.

Other engineer recommanded to me bq25616.
And I checked boost mode by OTG pin.
But boost mode is on, then doesn't change charger mode.
OTG pin to low then charger mode is on.

How to control boost mode and charger mode by automation?

Please help my project.
Thanks.

  • 0
    TI__Mastermind 18290 points

    Hi SangHwan,

    The BQ25616 cannot change from OTG mode to buck mode (charging mode) automatically. For automatic functionality, you may want to take a look at the BQ25618/619, assuming that the device can meet your other application needs.

    The BQ25618/619 device can automatically switch between OTG mode and buck mode when an adapter is removed or plugged in. Below is a description of the OTG mode (Boost Mode) operation where the automatic functionality is described in the datasheet:

    See Section 9.2 of the datasheet for a block diagram of a typical application with this charger.

    Regards

  • 0 in reply to James Steenbock
    Prodigy 10 points

    Thank you for your advice.
    I have one more question.

    Is this necessary to controlled by I2C? or possible to standalone?
    And bq25619 is possible to max charge current is 3A? (According to bq25619evm web page)

    As I need automatically change charger mode and boost mode,
    When normal stage this is operation to boost mode, and when charger connected then auto change charger mode.

    If you understood my situation, please recommand other solution,too.
    The battery spec is 3.7V/3.35mAh, possible to max charge current is 1.5~2A.

    Please contact again, soon.
    Have a nice day.

  • 0 in reply to SangHwan Nam
    TI__Mastermind 18290 points

    Hi SangHwan,

    The BQ25618/619 are I2C controlled devices. If you want to change the settings from their defaults you will need a host controller to interface with the device.

    The BQ25619 has a max input current of 3.2 A but the max charging current is 1.5 A (max current from the buck is 1.8A).

    As long as the conditions for Boost Mode operation are met, the device will be in Boost mode when there is no adapter connected. Once the adapter is connected, the conditions for charging mode must be met for the device to begin charging the battery.

    The BQ25616 and the BQ25606 are the two standalone single cell chargers that have integrated OTG (boost mode) functionality. However, they are not capable of automatic switching between OTG and charging mode.

    Battery Charger ICs

    Regards,

    James

  • 0 in reply to James Steenbock
    Prodigy 10 points

    Hi James. Thank you for your explain.

    Accoring your mention, If I don't need to chage default setting then It doesn't need to connection to I2C pin. Is right?

    Please answer again for me.
    Thank you for your kindness.

  • 0 in reply to SangHwan Nam
    TI__Mastermind 18290 points

    Hi SangHwan,

    That is correct. For more information check out Section 8.4.1 of the BQ25618/619 datasheet where host mode and default mode are discussed.

    Regards,

    James

  • 0 in reply to James Steenbock
    Prodigy 10 points

    Hi James.

    bq25619 can operate boost mode in default mode?
    I misunderstood your mention.

    I can't find setting information in default mode.
    Could you advice for it?

    Regards,

    Sanghwan

  • 0 in reply to SangHwan Nam
    TI__Mastermind 18290 points

    Hi Sanghwan,

    For the BQ25619/618, Boost Mode will not be available in default mode. You will need to write the REG01[5] BST_CONFIG bit to "1b" to enable Boost Mode and the Watchdog must be serviced afterwards for the bit to remain "1b". In default mode, BST_CONFIG = 0b.

    Section 8.4.1 of the datasheet has more information on default mode vs. host mode.

    Regards,

    James