TUSB522P: TUSB5220 application questions

John Liu59

Part Number: TUSB522P

Dear all,

For TUSB522P, I have following questions:

1. For the RX1P/1N , TX1P/1N, and RX2P/2N, TX2P/2N, they are separate pairs and can be set independently, the function of the two sets channels is also the same, am I right? in real application, those two sets can be used from either from host to receptacle or from receptacle to host, am I right?

2. For the isolated cap used, in EVM user guide, only TX pairs add 0.1uF, for RX pairs, no cap, but in datasheet, TX and RX in host side both has cap, so when do we need and this cap?

Thanks.

over 7 years ago

0 David (ASIC) Liu over 7 years ago

TI__Guru**** 178606 points

John

USB3.1 is a dual-bus architecture, the function of the two sets channel is the same. You can use it from host to receptacle or from receptacle to host, but the placement of the TUSB522P is critical in the system design.

The datasheet shows the application diagram of the embedded host while the EVM is designed to be connected to a standard host. For the standard host, AC coupling capacitors are on the host TX pairs, so there is no need to add additional caps on RX pairs. But you can still add caps on the RX pairs as long as the total capacitance does not exceed spec of 75nF to 220nF.

Thanks

David

0 John Liu59 over 7 years ago in reply to David (ASIC) Liu

TI__Intellectual 2735 points

Thanks very much, David.

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TUSB522P: TUSB5220 application questions