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BQ25895: BQ25895 sets which register makes the QC2.0 adapter output 9V instead of 12V?

user4720174
Prodigy 70 points
Part Number: BQ25895

We know that VBUS input 9V is more efficient than 12V,We know that VBUS input 9V is more efficient than 12V. My case adapter is QC2.0 18W (5V2A.9V2A.12V1.5A), but we don't know which register to set output 9V instead of 12V. Please give me a solution. Thank you.

  • 0
    TI__Guru 57481 points

    Hi,

    Please refer to https://e2e.ti.com/support/power-management/f/196/t/790857 for the detailed information.

    Thanks,

    Ning.

  • 0 in reply to Ning T
    Prodigy 70 points

    Dear Ning：

                    Thank you for your reply.

                    I know that bq25895 only supports QC2.0 but not QC3.0. I want to know which register bq25895 is modified to get 9V instead of 12V. The specifications of BQ25895 are not reflected.

                 

    Simple D+/D- voltage control
     Negotiation scheme: Charger indicates adapter to increase VBUS using D+/D-
    pin voltage control. Controls VBUS between 5V, 9V, and 12V.
     Host control: Two bits to control the interface in the BQ2589x family:
     EN_HVDCP: 0 – Disable, 1 – Enable interface
     EN_12V: 0 – VBUS=9V, 1 – VBUS=12V

    I can find EN_HVDCP, but I can't find EN_12V

    Can you provide driver code for bq25895?  

  • 0 in reply to user4720174
    TI__Guru 57481 points

    Hi,

    EN_12V is not needed. If HVDCP is enabled, the input voltage will go to 12V automatically.

    Sample driver code is located at .

    Thanks,

    Ning.