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TUSB2036: Schematic Design Support

Shivani Khamitkar
Prodigy 10 points
Part Number: TUSB2036


Hello,

We are using TUSB2036VF in one of our applications where we are adding cellular and Wifi modules to the existing printer via USB.

We came across a few doubts : 

1)Pin 21-Our cellular and wifi modules will be powered on by 3.3V and not with 5V, hub is used only for data transfer, so how to give overcurrent protection?

2)Pin 24- If we are not using 3rd port can we still configure the pin for 3 ports by making it low?

3)Datasheet recommends ferrite beads at the VCC pin it would be great if you suggest a part number of the ferrite bead

4)Should reset be permanently pulled up? because datasheet says reset must be asserted during power-up?

  • 0
    TI__Guru 60870 points

    Please be aware that the TUSB2036 is a Full Speed hub (12 Mbps) not a High Speed hub (480 Mbps).

    1. Overcurrent can be reported from whichever switch or power device is powering the downstream devices.  If they are permanently connected, overcurrent reporting is not required.

    2.  Yes, the TUSB2036 will operate at a 2 or 3 port hub as configured regardless of how many ports are populated.

    3. / 4.  Reset should not be pulled directly high, a resistor pullup and a capacitor to ground will help make sure reset is low while the device  is powered and then goes high.  Please see https://www.ti.com/lit/ug/sllu190/sllu190.pdf for more information.

    Regards,

    JMMN