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BQ25890H: BQ25890H QC2.0 Question.

Chun Youngsu
Expert 2485 points
Part Number: BQ25890H

Dear TI Team,

I am wondering if it is possible to operate according to the specification of QC2.0 when configuring with the following block.

Can the Charger side tell me how to adjust the voltage?

Can you check if the voltage is automatically changed by the current of CC line or D + / D- line through the algorithm of MCU?

And if you use S / W provided by TI, I wonder if it is not a license problem for Quick Charging unless you use QC2.0 phrase.

Thanks.

  • 0
    TI__Guru**** 166136 points
    Hi Chun,

    To achieve fast charging, high voltage (9V/12V) adapter with USB compatibility (5V) is required. TI refers such adapters as HVDCP (High Voltage Dedicated Charging Port) in general. Several companies have proprietary handshake to achieve this goal. QC2.0 is one that uses D+/D- handshake. These adapters all have an interface chip such as CHY100 (Power Integration) and iW62x (iWatt) included inside to handle the protocol. From market perspective, a lot of system vendors support these adapters with their own naming such as Adaptive Fast Charge (Samsung), Turbo Charge (Motorola), Boost Master (Asus). With so many different naming conventions and no industry standard, it is difficult for TI to claim 100% compatibility. TI has tested and confirmed bq2589x can support HVDCP with many interface chips in many adapter that includes Mediatek PumpExpress or QC2.0 support.

    With the help of end user host software, the BQ25890H D+/D- line voltages can be modulated to support even more HVDPC handshake protocols. The software is up to the end user to develop based on their specific adapter's handshake protocol, potentially including QC3.0. The appnote at the link below gives a brief explanation of this feature.

    www.ti.com/.../slua786

    The BQ25890H has an ADC that the host can read in order to determine the VBUS voltage after handshake.

    Regards,
    Jeff