TPS25810: TPS25810 unplugging not detected

Hi Foucauld,

We have not seen this issue before. The TPS25810 does not have intelligence to read the cable capabilities.

Have you been able to reproduce this issue with any other cables? Have you tested cables shorter than your testing currently? 

Please try to reproduce this issue with the TPS25810EVM. 

Thanks,

Emma

Hi Emma,

Thank you very much for your answer. Yes i was able to reproduce this issue with others cables, in fact i tried with two cables of 2m and one of 1m50 and this issue occurs. I also tried with two cables of 1m and 1cables of 10cm and the device works perfectly.

I was able to reproduce this issue with the TPS25810EVM. With an external power supply of 5V, a 2m cable (model given in first message) and this jumper configuration:

-J1,J2 & J5 between PIN1 and PIN2, J_VAUX between PIN1 and PIN2 and nothing on J13 and J14.

Thank you for your help,

Foucauld

Hi Foucauld, 

Please provide a detailed description of how you are testing this setup on the EVM. Pictures are a great help. I have lab time early next week and will be able to test your issue then. 

A few questions:

• Where are you sourcing power?
• Where are you measuring the voltage?
• What side do you disconnect to cause the issue?
• Are you using active cables?

Thanks,

Emma

Hi Emma,

I'm using an external power supply of 5V and setup to supply 2A at max. To cause the issue I disconnect the cable on my device side. As you can see on pictures, after a disconnection the UTP led (and POL dependent of initial orientation of cable) is still on.

Yes I'm using an electronic marked cable, you can find the datasheet of the 2m cable use during the pictures: www.digikey.ch/.../7902281

I hope that you'll be able to reproduce the issue during your lab time. If not please give me the reference of the USB-C cable used.

Please find pictures of the EVM board configuration, the external alimentation setup and a picture after a disconnection with UTP led still power on.

Best Regards,Pictures.zip

Hi Foucauld, 

I know you mentioned that you are using an external power supply, but are you connecting it to the TPS25810EVM? In the photo where you have the LEDs still on, the EVM is not connected to power. 

Thanks,

Emma

Hi Emma,

Yes a 5V power is connected to the TPS25810EVM on pictures via TP2. TP2 is connected to IN1, and IN2 via J5,and VAUX via J9. All the input are connected to the same 5V. I used this trick because I don't have the good power input connector to fit with J4.  But it is the same as using a 5v input on J4.

Best regards,

Foucauld

Hi Foucauld,

I tried your test setup in the lab with passive and active cables ranging from 1.8 m to 2 m with different cable manufacturers and could not recreate your issues. Can you submit a scope shot of the TPS25810's CC line voltage and VBUS? You may need a ticket board to do this: USB-C-PD-TKT-EVM. 

Thanks,

Emma

Hi Emma,

Thank you very much for your investigation on this issue, I've tried with another cable from JAE DX07 series, the DX07518S10N18747 which is 1 m length. The issue is still there so I think it's related to this cable model in particular and not the length of the cable.

I ordered other2 m cable and I will give you a feedback. Do you have the reference of 2 m cables that you used?

Best regards,

Foucauld

Hi Foucauld,

Please contact the cable manufacturer to follow up with this issue, as it is not an issue with the TPS25810 nor the TPS65982.

Thanks,

Emma