TPS65982: TPS65982 No Charger issue

Hi Hugo, 5A contract is not happening in one of the traces attached, Is that the issue? If yes, were these traces captured using same EMCA cable? Please probe VCON in the failing case and let us know the status. After PR_Swap, the cable is not responding to SoftReset and cable discovery. 

Thanks

Prajith 

Hi Sir,

Our customer tell me this issue is no charger on NB, they are Docking cant provide the PD to NB side.

The Following is VCONN waveform. 

Hugo

Hi Hugo, I don't think the capture above is during PR_Swap. Please probe VCON on both sides (NB and Dock) along with VBUS during power role swap. Cable is not responding to SoftReset after PR_Swap, I suspect that the cable is losing Vcon power for some reason. Please check this. 

Thanks

Prajith 

Hi Sir,

please see the attached file, 

Ch1=ZBook VCONN Voltage.

CH2=TPS65982 VCONN Voltage.

20191024.zip

Hello, As we suspected, Cable electronics is not getting VCON in the failing case. Host supplies VCON only for a short period of time and turns it off after that. Whereas, in the passing case Host provides VCON throughout. A source requires confirmation from the cable before supplying 5A. In this case, TI controller continues with 3A as it is not getting any response from the cable.

Thanks

Prajith  

Hi Sir,

Thank you very much.

How can we improve this failing case? modify HW or Register?

Hugo

Hi, What Host are you using for this test? Are you seeing the issue with any other host? 

Thanks

Prajith

Hi Sir,

Only HP ZBook 15 G5 and Cable Termination Type : VCONN not required No Charging.

Hugo