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FAULT pin goes HIGH when
(a) Power adapter does not advertise compatible PDOs
(b) VBUS is out of (vbus_min, vbus_max) range
If an OVP event happened, CYPD3177 will send hard reset to the source. It the retry still fails, it will shut down the VBUS gate. You can never get power to the system if an OVP state is not cleared.
Awesome, thanks for the reply, it's helpful!
I guess we're only left wondering why the system can still get power (at the PDO we requested), while the FAULT LED stays on.
Do you think there's some other corner case we left out?
From what you wrote, it sounds like an OVP state can only be cleared by retrying (and succeeding) in negotiating a PDO.
Is it possible for you to capture the cc log or read its status register via I2C? That can gives us some clue about what happens.
At this stage, I'm unable to do that. I'll follow up if I find a way.
My bad, the pin is behaving correctly. I'm marking this as answered.