TUSB1044: SBU lines have trouble working through the chip when targeting alt-mode devices

Prodigy 340 points

Replies: 1

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Part Number: TUSB1044

Hi,

I am posting this question on behalf of my customer.

We have a system that leverages your re-driver in one of our products. We found that when we are working with it in some configurations, the SBU lines have trouble working through the chip when we are targeting alt-mode devices. 

We validated that skipping the SBU interface with jumper wires we can realize full test operation on our target alt-mode devices.

What would you recommend as next steps to further debug the issue?

Thanks!
Lauren

1 Reply

  • Lauren

    Would you please ask them to use a multi-meter and check the common mode voltage on AUXP/N and SBU1/2? 

    The common mode voltage for AUXP and SBU1 when VCC is 3.3V is min of 0V and max of 0.4V.

    The common mode voltage for AUXN and SBU2 when VCC is 3.3V is min of 2.7 and max of 3.6V.

    Thanks

    David