Comments on Schematic sought (AT90USB647)

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Hi,

I'm drawing my first schematic, and I would appreciate some comments on my current result.

In particular, I have the following doubts:

    R1 is 47K in AT90USB design, 10K in the datasheet
    C4, C5 are 15pF in AT90USB design, 22pF in the datasheet
    VCC to +5V or to +3V3? (according to the AT90USB647 datasheet +3V3 is OK).
    UCAP is connected to +5V in the reference design. (only connected to a cap according to the AT90USB647 datasheet?)

the png and pdf files can be viewed also on http://www.tty1.net/usbi2c/.

Cheers,
Thomas

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