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[on:]

Hello,
I have seen in the Arduino UNO and Mega 2560 that there is a usb conversion chip.  In the R3, it is the 16U2 (or 4, I'm not sure), and in the R2, it is the 8U2.  On the Arduino page and on some others, I have seen the AT90USB162 and AT90USB82 for conversion chips.  They have different datasheets, but could someone verify what the differences are and if they are the same chip?
Thanks,
Qtechknow

[Reply #1 on:]

You'd have to read the data sheets to really see whats different between them.
From  a parametric comparison, they look pretty similar except for the "touch channels".
They have similar instruction sets, they may be different, etc.
For sure they different signature bytes.

[Reply #2 on:]

U2 is a 32in chip, U4 is a 44 pin chip.
16 & 8 refers to memory size.