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TUSB2036 worked for about 15 seconds , then unknown device

steve de coen
Prodigy 140 points
Other Parts Discussed in Thread: TUSB2036

I have used a TUSB2036 with a UART chip at channel 1, the other 2 channels goes to external USB ports.

This happened :

a) when i plugged in the USB cable from PC to JP3 for the first time, i did see theUSB HUB driver installed just fine, the 3 powerleds D17,D18,D19 where active and D15 and D16 where off.

b) after 10 seconds , i the UART driver was busy installing in W7 , so far so good !

c) after 15 seconds, the powerleds D17, 18, 19 did go out and D15 and D16 go ON. The driver installed stopped and windows told me "the device was removed or unplugged"

now every time i remove the cable from PC to JP3 , i see only D17 ON , and also D15 , D16 on

when i plugin the cable from PC to JP3 , D17 goes off ( SUSPEND = '1') and in device manager i see "unknown device"

Why did it work as expected the first 15 seconds and then stopped working completely?

Thank you for your help.3630.USB_HUB.pdf

  • 0
    Prodigy 140 points

    The issue is solved, it seemed the crystal was not oscillating always.

    Replaced the xtal and caps and now it works flawless.

    only question i have now is what is the difference between keeping NPINT0 at GND or VCC?

    When NPINT0 = GND then the hub "knows"  there are 3 external devices, when its '1' port 1 is used by a permanent attached device .

    But what does happen internally in the hub? will the permanent device work when NPINT0 is at GND?

    Thank you