need help for understanding STM32f407 + usb hub Tusb2046b

andrey2 · ‎2016-03-05

Posted on March 05, 2016 at 12:05

hi, all.

ive tryed to connect to my ..F407 via hub Tusb2046b

if i connect hub to PC without F407 - all work ok upstream and downstream..

but if i connect to downstream port F407, hub is crashed and Windows cant recognize

device... i configeured F407 as FS usb without VBUS and SOF ..type - deviceonly (i configured via CUBE)

Tesla DeLorean · ‎2016-03-05

Posted on March 05, 2016 at 18:04

Should we infer that the schematic is incomplete?

Is the 407 at least sharing a common ground? Is the 407 powered?

Not sure there are that many users here familiar with the hub in question, I guess we'll see.

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TDK · ‎2016-03-05

Posted on March 05, 2016 at 20:10

Is VDD 3.3V?

Shouldn't R8 be 1.5K? 27 ohms seems very low there.

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tsuneo · ‎2016-03-08

Posted on March 08, 2016 at 14:49

A 6MHz crystal (and capacitors) across XTAL1/XTAL2 (30/29 pins).

Even when the base clock would deviate around 3-4%, the hub could be enumerated by host. But SOF synchronization on the hub could fail. Without SOF synchronization, babble error is wrongly detected by the hub, when downstream device is connected.

Tsuneo