TUSB2077A: 20 Port USB Hub Schematic Review

Joseph Burton

Part Number: TUSB2077A

I am designing a 20 port USB hub to expand the capabilites of a host controller. I have attached the USB hub portion of the schematic for a review, if possible.

The hub is self powered by a 5V, 4A capable wall adapter.

The 20 USB devices will be permanently installed, and as such will be already inserted when the board powers on.

Average current draw of the USB devices is 20mA, with short spikes up to about 200mA once every few minutes.

Thank you very much for all your help and have a great day!

GEM4NFC Panel Programmer USB Hub.pdf

4 months ago

0 Brian Zhou 4 months ago

TI__Guru**** 161576 points

Hi Joseph:

I'm working on schematic review and will be complete by tomorrow.

Best

Brian

0 Brian Zhou 4 months ago in reply to Brian Zhou

TI__Guru**** 161576 points

for U2 TUSB2077:

1; need similar schematic for down stream ports

2: need 0,1uf cap close to pin 9 and 46.

3:leave DP/DM floating if not used

I will review TUSB2046 tomorrow.

Regards

Brian

0 Joseph Burton 4 months ago in reply to Brian Zhou

Prodigy 30 points

1 - The downstream ports are the other 5 USB hubs. The series resistors and 22pF caps are on those hub sections.

I have updated the schematic with your notes and corrected a few net name errors on the 5 downstream hubs.

7838.GEM4NFC Panel Programmer USB Hub.pdf