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HD3SS3220 AC coupling question

Kai Hsiao
Guru 12675 points
Other Parts Discussed in Thread: HD3SS3220

Dear Sir 

I saw HD3SS3220 user guide mention if the VCM exceed 2V ,the cap need to use 0.5uF and 100kohm to GND

I don't understand why need to use 0.5uF and what's situation that VCM will be over 2V

Do you have any website or document describe it ??

If I use 0.1uF to design ,have anything I need to take care?? (I never use 0.5uF for USB ac coupling)

This project is a TypeA to TypeC dongle 

Thanks 

  • 0
    TI__Mastermind 36085 points

    Hello Kai,

        The AC capacitors are intended to avoid a VCM > 2V, so it shouldn't be above this value. Now, the HD3SS3220 is a passive switch wich means that all the capacitances on the channel will be in series, therefore the .5uF value is intended to minimize the effect of all the series capacitors on the USB path, remember that for type C applications you will have switches on both sides of the cable.

    Regards,

    Diego.