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
已解决! 转到解答。
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