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TUSB1002A: Re-Driver question

Cedrick
Expert 8270 points
Part Number: TUSB1002A


Hi,

Good day. I hope you are doing well.

Our customer is using the TUSB1002A and they have the inquiry below.

""USB-A connector support USB3.2 Gen2 downstream port with TUSB1002A Re-driver question.
Normally, RXP/N have not AC coupling Cap on USB-A downstream port USB-A connector.  
Is it needed to add AC coupling Cap 0.33uF and pull low 220Kohm between with TUB1002A RX1P/N and USB-A connector pin5/6?
Can I without AC coupling Cap 0.33uF and pull low 220Kohm between  with TUB1002A RX1P/N and USB-A connector pin5/6?""

Looking forward to your inputs. Thank you.


Regards.

Cedrick

  • 0
    TI__Guru**** 181891 points

    Cedrick

    Inclusion of the 330 nF capacitors and 220k resistors on RX is optional. 

    Three implementation options for USB connector to TUSB1002A's RX pins:

    1. DC couple TUSB1002A's RX pins to USB connector. No 330 nF capacitors and no 220 kΩ pull-down resistors.

    2. 330 nF capacitors with 220 kΩ resistors as depicted in Figure 18 of the TUSB1002A datasheet. The purpose of 220 kΩ resistors is to discharge the capacitor within 250ms after a USB device is removed from the USB connector.

    3. The stub from the 220 kΩ resistor pad may create impedance discontinuities causing negative impact to performance. Assuming leakage current from external components is enough to discharge capacitor, 330 nF capacitor without the 220 kΩ resistor is a valid option.

    Thanks

    David