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TUSB320: Not working with wall charger

Nicholas Hunn
Prodigy 50 points
Part Number: TUSB320

Hi, I've implemented a TUSB320 for Type-C charger detection in our product. We are acting as the sink, but I've tried acting as a DRP as well. I can detect the ports on my laptop correctly in both high and medium current mode, as well as regular USB ports.

However, when using a phone charger (namely this one https://store.google.com/au/product/usb_c_18w_power_adapter_2 ), I fail to detect that a charger is even connected. When I measure the voltages, VBus is low, one CC line is low and the other is around 2.5V.

Are there any configuration steps that might cause or fix this sort of problem? I don't see any configuration options that would cause this.

  • 0
    TI__Guru 64326 points

    Hi Nicholas,

    Do you get the same voltage on the other CC pin when the cable is flipped. When TUSB320 is configured as a UFP it only presents a Rd termination on the CC line. The maximum voltage on the active CC line should be ~2.04V according to the Type-C spec and the TUSB320 datasheet. It may be that this charger has a very strong current source on CC line to generate this high voltage.

  • 0 in reply to Malik Barton57
    Prodigy 50 points

    Yes, I get the same voltage on the other CC line when flipped. I was mis-remembering when I said 2.5V, it's actually 1.6V. So one is ~0V and the other ~1.6V, alternating if I flip the cable.

  • 0 in reply to Nicholas Hunn
    Prodigy 50 points

    Thanks for the help, solved my problem. It was actually a separate part of the system backfeeding a small voltage onto the USB power line and the charger not powering up because of it. Works perfectly once I fix that part of the circuit.