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TUSB544: DP ALT AND USB3.1 GEN1

pan yanping
Prodigy 10 points
Part Number: TUSB544
Other Parts Discussed in Thread: TUSB422

We want to use TUSB544 to make TYPEC REDRIVER CABLE to implement both DP ALT and USB3.1 GEN1 with length of 5m .

I have 2 questiones:

Q1: Figuer 39 in the data manual states that a TUSB544 IC should be added to each end of the wire . I don't quite understand. Can you use a single chip to implement C to C applications?  B Circuit is OK?  

Q2: If B circuit is OK, can sourcer and sink be bidirectionally used?  And  are there other better IC recommendations, thank you!  

  • 0
    TI__Guru**** 176811 points

    Hi,

    Figure 39 in the datasheet shows TUSB544 being used in source and sink design, it is not for cable implementation. 

    For active cable implementation, you can use one TUSB544 as long as you can keep the total cable loss within the spec of 7dB loss. And it will support bidirectional communication. 

    Thanks

    David

  • 0
    Prodigy 10 points

    Hi David 

               We want to use TUSB544 develop a USBC GEN1 active cable,Length  5M.We will use GPIO mode config tusb544 in USB3.1 and 2 lanes of DisplayPort mode

    ,Does it need PD IC?  if need PD IC , Should it  provide FLIP control signal to the TUSB544?

    Do you have Similar applications schematic,thank you!

  • 0 in reply to pan yanping
    TI__Guru**** 176811 points

    Hi,

    Do we know the insertion loss of the 5m cable? 

    Use the informative cable loss in the USB Type-C spec, 

    With 30AWG, the loss is 2.5dB/m at Nyquist frequency of 2.5GHz. 5m cable would give us 12.5dB loss total. 7dB loss is the max cable loss a USB compliant host and sink can support, so TUSB544 needs to support the extra 5.5dB which is within its RX EQ compensation range. So you would only need one TUSB544. 

    You would also need a TUSB422 to snoop the CC1/CC2 bus line to determine the Type-C orientation. The TUSB422 would then report the orientation to a micro-controller through its I2C bus and then the microcontroller will appropriately set the TUSB544 normal/flip.

    Thanks

    David