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Original question:

PMP40496: Charge not working with Power Delivery Charger

TUSB320LAI: How to enable charge with BQ25883

Federico Gaetani
Prodigy 85 points
Part Number: TUSB320LAI
Other Parts Discussed in Thread: PMP40496, , BQ25883, TUSB320

Hello everyone,

We have designed and prototyping a board similar to PMP40496 2-cell boost charge system reference design with 5-V USB.

I have a doubt about this design, what is the task of the IC TUSB320LAI in this design? How can I enable charge with the bq25883 when I have a Power Delivery charger?

Looking for other questions I noticed that TUSB320LAI does not support Power Delivery, but then I don't understand what it is used for PMP40496 design.

Thank you for the support!

Best Regards,

  • 0
    TI__Guru** 105055 points

    TUSB320 is used here for CC communication for type-c system. if you don't have type-C port here, you may not need TUSb320.

  • 0
    TI__Guru 64326 points

    Hi Federico,

    TUSB320LAI is primarily used to interface with the CC pins of the Type-C connector. It would indicate when a valid connection is made detect or advertise the charging level of the Type-C connection. TUSB320LAI should be used up to 15W of charge (5V Vbus). If you have a PD controller you can get up too 100W of charging. Both could interface with BQ25883 over I2C to help enable the right level of charging. 

  • 0 in reply to Brian Zhou
    Prodigy 85 points

    Hi Brian, in my design I have a type-C port, but when I connect a Power Delivery 2.0 Charger (18W) I have 0V on VBUS and BQ25883 is power down.

  • 0 in reply to Malik Barton57
    Prodigy 85 points

    Hi Malik,

    thank you.

    I have no need to go beyond 5V 3A (15W) charging, but we have a problem when connect a Power Delivery 2.0 Charger (18W) through USB type-C cable. In this conditions VBUS is 0V and BQ25883 is power down. The IC TUSB320 must receive a i2C command so that the 5V output of the wall charger can be enabled?

    Thanks!

    Best regards,

    Federico

  • 0 in reply to Federico Gaetani
    TI__Guru 64326 points

    Hi Rederico,

    No, TUSB320 will communicate with the PD controller on the other side throught the CC lines. I2C can be used to see what TUSB320  has detected on the other side of the type-c cable. If possible a basic check you can do is to see if any communication is happening over the CC lines. Can you probe the CC line when connect with a scope?

  • 0 in reply to Malik Barton57
    Prodigy 85 points

    Hi Malik,

    I did a quick test and I noticed that the CC lines are at GND, the resistence is 0 Ohm to GND (measured with multimeter).
    As you suggested me, in the next days we will measure through oscilloscole the activity on CC1 and CC2 pin when USB-C PD supply connection happen.

    I let's you know on this further test.

    Thanks

    Federico

  • 0 in reply to Federico Gaetani
    TI__Guru 64326 points

    Hi Fedrico,

    If there is not a obvious reason for the short to GND, I would consider re-flowing the board. They may be two pad shorted together on underneath a SMT part. As an example, you should measure ~5.1k when a DFP and UFP are connected together. 

  • 0 in reply to Malik Barton57
    Prodigy 85 points

    Hi Malik,
    It seems a little strange that both CC lines are shorted GND, however we will try to reflow the booard.
    What is the resistance that I should read with the board not powered? Even when th board is turn off I have GND con CC lines.

    Also, I'm using a TUSB320I and not a TUSB320LAI, but I don't think it's a problem.

    Thanks,

    Federico

  • 0 in reply to Federico Gaetani
    TI__Guru 64326 points

    Hi Federico,

    I recommend using TUSB320LAI. TUSB320I does have a dead battery mode where Rd (~5.1k pull-down) should be present when Vcc is off. you could also consider replacing the part on the board.