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BQ25895: Charging issue with BQ25895

Dave Chang
Expert 3005 points
Part Number: BQ25895

Hello support team,

This is FAE Dave and here's the question from my customer that I need your help. Thanks!

They cannot charging with the current of 3A, the maximum is 2A now.

The detailed question is here:

According to the datasheet, is only the DCP mode able to charge with 3A?

The D+ and D- are empty, and not connecting to the USB port. The source detection is disable now, is 3A be able to charge at this condition?

The figure below are the datasheet and their register setting.

 

Here's the extra information:

They use Huawei P20 charger that supports 5V/2A , 5V/4.5A, .4.5V/5A output.

When they change REG01 to 0x10, it is able to charge with 2.5A.

If using DC source adapter, and voltage is adjust to 6V, it is able to charge with 3A.

Thanks for the help and look forward to your reply.

Best Regards,

Dave

  • 0
    TI__Mastermind 19275 points

    Hi Dave, 

    The D+/D- detection is used to set an input current limit, which is a different value than the charger current setting on the BQ25895. The charger will default to 500mA when D+/D- are tied to ground because it detects an unknown adapter. It will default to 1.5A when the pins are tied together and floating. To raise the input limit higher than 1.5A you will need to write the desired current limit via I2C and ensure the ILIM pin is set correctly, or disabled. The max allowable input current is 3.25A. 

    Then ICHG, set on I2C REG04, is used to set the charge current. The default is 2A. Write via I2C to adjust ICHG to the desired 3A.

    This thread may be helpful as well for reference on disconnected D+/D- pins: e2e.ti.com/.../bq25895-input-current-limit-setting-by-d-d-

    Regards,

    Garrett