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USB EZ-PD™ Type-C

KiLe_4629881
Level 3
25 sign-ins 10 replies posted 10 questions asked
Level 3

If the CCG3120 is unpowered from either VSYS or VBUS and HPD is high, is there any concern or risk of damaging the device?

Based on our measurements I think in this state VDDIO will be back powered through internal body diodes. Is this a safe condition to be in? 

This is an easy condition to enter if the ccg3 is unplugged from the host, but still attached to a monitor. 

Since we were externally powering VDDIO - we noticed that this would cause the CCG3120 to get in a bad state. 

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ShifangZ_26
Moderator
Moderator 1000 replies posted 750 replies posted 500 solutions authored
Moderator

Hi Kyle,

For the design of HPD signal, you should make sure the pull-down resistance on HPD signal is loaded and the value is large as possible, for example, 1M. The Body Diode max current from VDD to VSS is 100uA. You should meet this specification.

 

Best Regards,

Lisa

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