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MCU Voltage Level vs USB FS

Question asked by mynickname on Apr 23, 2013
Latest reply on Apr 23, 2013 by mynickname
Hi,

My F4 MCU is running at 2.8V, but I need to use USB OTG FS peripheral.
MCU is device mode (peripheral mode) and not bus powered, I only use vbus, for detect dm-dp signals entity.
Data is bidirectional

VBus, DM,DP

But, there is a threshold VIHZ 2.7V for D+ AND D- signals. (In USB 2.0 Spec, 7.1.4, Fg: 7.26)

So if any of D+, D- drops under 2.7V, result: "Device disconnected"

As far as I understand I need to translate voltage levels for D+ and D-. (vbus not neccessary)

Note: Solution must be low price.

1. How can I do it properly? Which IC do I need to use for given specs?
2. Can I connect Vbus directly to MCU?

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