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

Lauren Mayfield

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

over 4 years ago

0 David (ASIC) Liu over 4 years ago

TI__Guru*** 139405 points

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

0 David (ASIC) Liu over 4 years ago in reply to David (ASIC) Liu

TI__Guru*** 139405 points

Lauren

Do you have an update?

Thanks

David

0 Lauren Mayfield over 4 years ago in reply to David (ASIC) Liu

TI__Expert 6890 points

Hi David,

No update - I haven't heard back from the customer yet. Thank you for your support though, for now I will close this and if I hear back from the customer I will open another post.

Thanks,

Lauren

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