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BQ25601D: BC 1.2 supper-speed 900mA

d_zero
Genius 4775 points
Part Number: BQ25601D
Other Parts Discussed in Thread: TPS2549

Dear *,

the BQ25601D is a compliant with BC 1.2 standard.

In DS on page 19 Table 2. Input current limit setting from D+/D- detection says:

If USB SDP then current limit 500mA (USB2.0)

If we connect to SDP (USB3.0) is the BQ25601D capable to detect 900mA current limit?

Because the BC 1.2 on page 44 Table 5-2 says if a PD is attached to a SuperSpeed port, then ICFG max is 900mA.

Best Regards,

David.

  • 0
    TI__Genius 11850 points

    Hi David,

    If either USB 2.0 or USB 3.0 is connected, then the BQ25601D will automatically identify a SDP and set the default current limit to 500 mA. This is the correct value for USB 2.0, but not for USB 3.0. For USB 3.0, the host will need to overwrite the IINDPM bits to 900 mA in register REG00 bits[4:0], as shown in the picture below.

    Best regards,

    Angelo

  • 0 in reply to Angelo Zhang87
    Genius 4775 points

    Hi Angelo,

    is there a charger controller that can detect USB3.0 900mA through D+ D- , and there is no need for host adjustment intervention?

    Best Regards,
    David.

  • 0 in reply to d_zero
    TI__Genius 11850 points
    Hi David,

    No. If our D+/D- chargers detect a SDP, then they default to a 500 mA input current limit. A host or interface will be needed to change this to 900 mA instead.

    Best regards,
    Angelo
  • 0 in reply to Angelo Zhang87
    Genius 4775 points

    Hi Angelo,

    if no charger ic can't do it,

    are there any usb charging port controllers that can detect the difference between SDP 500mA and SDP 900mA?

    Maybe TPS2549 can tell difference without host ?

    Best Regards,
    David.

  • 0 in reply to d_zero
    TI__Genius 11850 points

    Hi David,

    Sorry, I'm not sure because I only support the battery charger ICs. From glancing at the datasheet though, it looks like that device will also require host control:

    Please create a new thread asking about the TPS2549, and the appropriate team within TI will get back to you with a definitive answer and/or suggest another device which might suit your application.

    Best regards,

    Angelo