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TUSB2036 cannot be recognized without overcurrent protection

Gyorgy Sagi
Prodigy 30 points
Other Parts Discussed in Thread: TPS2042, TUSB2036

I built a hub based on this "6Mhz Bus-powered 2-port hub.pdf" schematic found in the TUSB2036 Reference schematic. I wouldn't like to use overcurrent protection and TPS2042. Is it possible to use TUSB2036 it without TPS2042. If it is possible , then what modifications should I make to the schematic I mentioned (6Mhz Bus-powered 2-port hub.pdf)?

 

Thank you!

Gyorgy Sagi

  • 0
    TI__Prodigy 255 points

    If you are sure there will never be an overcurrent situation then you can power the downstream ports directly from a regulated 5V supply. To "fool" the TUSB2036, OVERCUR1, OVRCUR2, and OVRCUR3 (being active low) should be tied high (3.3V.) Leave the PWRONn outputs open.

  • 0 in reply to Ted Mahler
    Prodigy 60 points

    Hello! I'd like to extend this old question. If you avoid using the TPS2042 in both the self-powered and bus-powered modes, what should one set pin 21 (_ocprot/_pwrsw) to? (I'm trying to develop a self-powered usb hub without the TPS2042 but I set pin 21 high, for the very reason that I WASN'T using a power switching IC in my design. The design hasn't enumerated successfully.)