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TUSB8041: TUSB8041 USB C to A problem

Part Number: TUSB8041

Hello, we are developing a USB HUB using TUSB8041.
When I first made the development board, I confirmed that it works normally with USB A to B and B to C cables.

Later, I changed the upstream to Type C and made a new board, but the C to C cable works normally, but the A to C cable caused current consumption and heat generation, causing intermittent disconnection.
(C to C cables generate a current consumption of about 30mA,
When using C to A, power consumption of 150mA or more and heat generation occurred in LDO and MCU)

May I ask you to advise if there is a problem with my circuit or should I use a different method in A to C?

Thank you.

  • Hi,

    A standard A to C cable would have CC1 being connected to VBUS through a Rp resistor as shown below.

    With 5.1k pulldown and 56k pullup, you are creating a resistor divider on the VBUS.

    For using Type-C connector, you would need to use a CC controller and use the CC controller to control CC1/2, instead having both CC1 and CC2 directly connected to GND through 5.1k resistor.

    Thanks
    David