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Hi.
I designed a CPU with USB port connected to CYC65632 upstream port.
CYC65632 is designed as a self powered usb hub.
This main board is powered only with 3.3V.
How should I manage the ExtReset# pin to guaranty the presence of Vusb ?
Should I connect it to +3.3V (with a R + R//C bridge ?) ?
Thank
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Hi
As I mentioned, I don't have Vbus available so can't apply the typical schematic
To solve the problem, I connected reset pin to 3.3V via a RC bridge but ommitted the second resistance for the voltage divider
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Hi,
Since it is a self-powered hub design, please connect VBUS from the CPU to the Reset pin of the hub with a RC circuit providing a delay of 10ms. This will hold the hub in reset till CPU is connected and VBUS is stable.
You could check to the 4607 DVK schematic for reference- https://www.cypress.com/file/117531/download
Best Regards,
Sananya
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Hi
As I mentioned, I don't have Vbus available so can't apply the typical schematic
To solve the problem, I connected reset pin to 3.3V via a RC bridge but ommitted the second resistance for the voltage divider