TUSB2036: USB error "-71"

Mahdi Khalili

Part Number: TUSB2036

We are working with a DART-MX8M-MINI and the TUSB2036 is connected to two downstream port. the upstream is connected to DART-MX8M-MINI.

But we were forced to switch to a TUSB2036 hub, which is not detecting the devices downstream. We get a cryptic USB error "-71".

We tried switching the NPINTx pins to GND, and adding pull-ups to the OVRCURx/OCPROT pins, but it did not solve the problem.

We didn't use termination resistors, just added 90Ohm common filter. do we have a problem like this error message, because of termination resistor?

Thanks

over 3 years ago

0 JMMN over 3 years ago

TI__Guru 60870 points

Hi Mahdi,

Can you share your schematic? Accept my friend request and send it directly to me if you don't want to post it.

Make sure you have the 1.5K pullup on the upstream DP, and the 15K pulldowns on the downstream DP/DM. Also, please confirm that the hub is get a RESET (with RC circuit), not just tying RESET directly high.

Regards,

JMMN

0 Mahdi Khalili over 3 years ago in reply to JMMN

Prodigy 55 points

Hi, I used the 15K pull down resistor and problem solved. Thanks

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TUSB2036: USB error "-71"