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TPD6S300: USB superspeed is getting detected over single orientation

Abhishek singh
Expert 2000 points
Part Number: TPD6S300
Other Parts Discussed in Thread: TUSB542, , STRIKE

Hi  Team  

I am  using  TPD6S300  in our  design. We  are  facing issue  that we  are able  to  detect superspeed  in one  orientation ,while  we are  not  able  to detect  superspeed in other  orientation. In order  to  figure out issue 

we even drive SEL pin of TUSB542 high  and  low  forcefully  to select  different  path. Please  find  attached  schematic  of  complete  path. Below  are few  query and confusion 

1) What  should  be  default  voltages of  various  pins  of  TPS6S300  ie  before  insertion  of  cable  and  after  insertion of  cable? 

3)  I am  getting  Vbias Low, C_CC1 and  C_CC2 low  and  CC1 and CC2  high  is  it  correct  ?

4) As  per  my  understanding  C_CC1  and  CC1  should be  exactly  same. Please  confirm if  my  understanding is correct  ?   

5) Please  let  me know  what should be  exact steps  for  enumeration , ie  how  different  signals  and  voltage  level  should come . Please  share  me  any  document  if  you  have.

/cfs-file/__key/communityserver-discussions-components-files/138/501_2D00_1_2D00_01380_5F00_a1.pdf

 

  • 0
    TI__Genius 9630 points

    Hello,

    1. I recommend checking out the TPD6S300 datasheet for some application curves on how cable insertion affects the different pins. 

    3. Vbias will always be low, as it is grounded. The CC lines should be passed through unless a trip event has happened.

    4. Your understanding is correct unless a protection event has occurred, then they will disconnect. 

    5. To learn more about CC enumeration, please check out the USB Type-C spec .

    Can you confirm that the TPD6S300 is receiving power? If you take some scope shots of the behavior I can verify its working. 

    Also, as a side note, the TPD6S300A is pin to pin compatible with the TPD6S300 and does not disconnect the USB Type-C Port during an IEC 61000-4-2 ESD strike, whereas the TPD6S300 will. 

    Thanks,

    Emma