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BQ25619: BATFET Disable (Enter Ship Mode) with adapter on

Jay Yeh
Intellectual 465 points
Part Number: BQ25619

Hi,

Quote from Section 8.3.7.1 of the datasheet of BQ25619(the Spet. 2019 version), 

"To set the device into ship mode with the adapter present, the host has to first set BATFET_RST_VBUS to 1 and then BATFET_DIS to 1. The charger will turn off the BATFET (no charging, no supplement) while the adapter is still attached. ".

Is BATFET_RST_VBUS the typo of BATFET_RST_WVBUS?

Also, even I set the BATFET_RST_WVBUS to 1 and then BATFET_DIS to 1, the Vsys seems to be still on. Is there any delay needed or any suggestion?

Thanks

  • 0
    TI__Expert 5590 points

    Jay:

    Yes, BATFET_RST_WVBUS is typo, it should be BATFET_RST_VBUS. Yes, there is 10 second delay. However, you can set the delay time yo zero. After you set BATFET_DLY to 0, BATFET will be turned off immediately.

    Regards,

    Hong

  • 0 in reply to Hong Mao
    Intellectual 465 points

    Hi

    Thanks for your reply.

    With adapter on, I set BATFET_DLY to 0, and BATFET_RST_WVBUS and BATFET_DIS to 1.

    But there's still power available on the SYS pin.

    Does this command switches the BATFET only but still keep the path from VBus to Vsys on?

  • 0 in reply to Jay Yeh
    TI__Expert 5590 points

    Hi Jay:

    Let me understand what is your purpose to disable SYS power. You want to put the device in ship mode with adaptor attached or you want to disable SYS power with adaptor attached? BATFET is controlled by BATFET_DIS bit but the Buck converter is not controlled by BATFET_DIS. To disable Buck converter, you need to put the device in HiZ mode with EN_HiZ=1.

    BQ25619 allows SYS reset with adaptor attached with the setting:  

    BATFET_RST_EN=1, BATFET_DLY =0, and BATFET_RST_WVBUS and BATFET_DIS to 1

    Keep in mind, this is SYS reset, which means VSYS goes back to normal after SYS is shut off for a period of time.

  • 0 in reply to Hong Mao
    Intellectual 465 points

    HI,

    Thanks for your reply.

    The product I am designing uses the same 5V power source to supply two modules, and one of the module's power system is controlled by BQ25619.

    One application scenario is to have this module as low power as possible to make most of the power supply to the other module even when the 5V power source is available(adapter on).

    So it should be disable both VSys and BATFET of BQ25619 so that this module does not consume power from both battery and 5v power supply.

    One more question, with EN_HIZ=1, BATFET_DIS=1, BATFET_RST_WVBUS=1, it would disable Vsys and BATFET, will the charger charge the battery?

  • 0 in reply to Jay Yeh
    TI__Expert 5590 points

    Hi, BATFET_RST_WVBUS=1 is for SYS reset only. The answer is no, to charge the battery, both bits should be zero. See the table below:

    Enable HiZ

    Disable BATFET

    VSYS

    ICHG

    0

    0

    Yes from VBUS

    Yes

    0

    1

    Yes from VBUS

    No

    1

    0

    Yes from BAT

    No

    1

    1

    No

    No