• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 41 subscribers
  • Views 379 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PMP40496: Charge not working with Power Delivery Charger

Federico Gaetani
Prodigy 85 points
Part Number: PMP40496
Other Parts Discussed in Thread: BQ25883, TUSB320LAI, TUSB320LI, TUSB320

Hello everyone,

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

We have used the same schematic of this reference, but we don't use a TI microcontroller. The charge and discharge works fine, but we have a problem when connect a Power Delivery Charger (18W) through USB type-C cable. In this conditions VBUS is 0V and BQ25883 is power down.

It seem that Power Delivery charger doesn't check something and then it doesn't permits to delivery power on USB type-C cable.

What is the task of the IC TUSB320LAI in this design? Could it be a problem due to the fact that we have not implemented the microcontroller firmware?

Thank you for the support!

Best Regards,

  • 0
    TI__Prodigy 580 points

    Hi,

    TUSB320LI is a Type-C Configuration Channel logic, it identify the attached port is adapter or device, and deliver the type-C spec of attached port to MCU, then MCU command BQ25883 to charging or discharging. Without the communication of CC logic, an attached adapter can not output. And you can refer to the below block diagram in 'A primer on USB Type-C and power delivery applications and requirements'.

    Thanks.

  • 0 in reply to San Chen
    Prodigy 195 points

    Hi,
    I'm a collegue of Federico Gaetani.


    Our system charges 2s lithium ion cells by bq25883. System doesn't source current to any host device.


    So, TUSB320 must ack like a UFP device that sinks current from USB type-C port.

    To check system function with a power delivery supply, we have forced 'port' pin to GND in order to set TUSB320 in UFP mode.

    Then we connected a USB-C cable of Power Delivery source.
    Measuring Vbus this is 0V so it means the power supply doesn't delivery power on cable (beacuse power supply doesn't recognizes our system as UFP device).

    What other test can I do to check correct function?

    Fabio

  • 0 in reply to Fabio Bianco
    TI__Prodigy 580 points

    Hi, Fabio.

    Besides the hardware configuration, TUSB320 also needs to be writing/reading by I2C. You can download PMP40496 Firmware which under the reference design page http://www.ti.com/tool/PMP40496, search TUSB320 folder to find the configuration code. Thanks.