TUSB320LAI: When set to DRP, the device connection cannot be detected.

Hi,

Can you share the CC waveforms before and after the device is plugged in?

Additionally, do you have a capture of the full config of the part?

Thanks for your comment.
I will share the waveforms before and after connecting the device.
After connecting, the square wave of CC2 has changed from 3.3V to 0.4V.

These waveforms signify damage to the part. Can you try replacing the part? The waveforms for DRP should look as follows.

Thank you for your reply.

When I connect the device with the power off and then turn it on, the waveform looks like the one you showed me and the device can be detected.
The problem is that when I connect the device with the power on, the waveform I showed appears and the connection cannot be recognized.
Does this mean that the TUSB320LAI might be broken?

When I pulled up PROT and set it to DFP, I was able to detect the device even after turning on the power.
When I set PROT to OPEN and back to DRP, I still couldn't detect the device.

Hi,

Are you using an EVM for this application?

If not can you share the schematic? Can you share the DFP waveforms as well? Try replacing the unit used and see if the the issue persists.

Thank you for your reply.
I am not using EVM.
I will share the circuit diagram and the waveforms when the DFP is set up.

I am using TPS25221DBVR to control VBUS, but EN was not being controlled correctly.
It was set to H regardless of the device connection.
When I connected a device in the DFP setting, ID changed to L, but does it affect the ID output in the DRP?

Thank you in advance.

This also implies damage to the part. 

Try replacing the TUSB320 on the board and see the impact. It also might be worthwhile to test your application on an EVM to make sure its not a pcb implementation issue.

The schematic looks ok from what I see.