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USB hosts hubs transceivers Forum Discussions

aldoc_3474881
Level 1
Level 1

Hello.

I see that the sample schematic for CYUSB3304  has a circuit for over-voltage protection. So, when the VBUS gets above around 5.8V, then the VBUS_US pin gets disabled. Does the chip kill the power by the PWR_EN pin to the power switch chip (U5) after VBUS_US goes low?

Alin

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Anonymous
Not applicable

Hi Alin,

When the VBUS from Host on Upstream exceeds the recommended voltage range, Over Voltage Protection IC disables VBUS_US.

And YES, the VBUS on the downstream ports will be disabled by PWR_EN through power switch, if Ghost Charging is disabled.

Else if Ghost Charging is enabled, the VBUS on the downstream ports will be 5V.

Regards,

Anil  

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Anonymous
Not applicable

Hi Alin,

When the VBUS from Host on Upstream exceeds the recommended voltage range, Over Voltage Protection IC disables VBUS_US.

And YES, the VBUS on the downstream ports will be disabled by PWR_EN through power switch, if Ghost Charging is disabled.

Else if Ghost Charging is enabled, the VBUS on the downstream ports will be 5V.

Regards,

Anil  

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