Questions regarding CYUSB3304 | Cypress Semiconductor
Questions regarding CYUSB3304
Hello, I'm using this hub with one US from a computer and two DS's which I locally power supply, and therefore don't need any of the features ghost charge& ACA-Dock. I also want to configure the hub through internal ROM configuration in order to save an external EEPROM.
From the datasheet I can see ACA-Dock is not supported by my selected device but ghost charge is. The default configuration enables the ghost charge, and I can't disable it when using internal ROM. I want to know what are the implications on my design? how do I need to connect VBUS_US & VBUS_DS? can I connect them to a local 5V DC-DC? can I leave them floating? I also doesn't need the OVRCURR& PWR_EN , can I leave theme floating?
I also don't fully understand the concept of Embedded_Hub, what is the default level using an internal ROM and what are the implications on the US? in the CY4609 evaluation board, the VBUS_US is connected to a local 5V through 2 10K resistors voltage divider (why?) to turn the HX3 to work as Embedded hub, why is that?
Thank you for your answer.