PTN5150 Cold Plug State

[lucavald]

Hi,

I have a device that I'd like to run in two modes with the PTN5150:

1. When battery is present, use USB-C DRP mode.

2. When battery is not present, use USB-C UFP mode.

I know the PTN5150 would work well for the first mode, but I am unsure about the second. In the second mode, the PTN5150 will have no supply voltage and from my understanding, VBUS is not connected to a UFP until CC detection is complete. Will UFP CC detection work if the PTN5150 has no power or do I have to find another solution?

Thanks,

Luca

[guoweisun · Accepted solution]

CC pins connected to VDD internally of IC, if VDD no power,CC pin can't work normally.

[gavin5342]

I want to do something similar in my system.

Could you check that the CC pin doesn't work properly when VDD is unpowered because:

1) This UFP use case is covered in the demo board.

2) When I connect 5V through a 10K resistor to CCx on an unpowered PTN5150A, I read 1.27V on the CCx pin.

It looks like the PTN5150A is implementing the +/- 20% voltage clamp from table 4-25 of the USB Type-C spec before it is powered.

Thanks,
Gavin