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andrey2
andrey2
Visitor II
March 5, 2016
Question

need help for understanding STM32f407 + usb hub Tusb2046b

  • March 5, 2016
  • 3 replies
  • 742 views
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)

0690X00000605N5QAI.png

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    3 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    March 5, 2016
    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
    TDK
    March 5, 2016
    Posted on March 05, 2016 at 20:10

    Is VDD 3.3V?

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

    "If you feel a post has answered your question, please click ""Accept as Solution""."
    tsuneo
    tsuneo
    Associate II
    March 8, 2016
    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

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