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USB interfacing for AVR microcontrollers

Posted on Monday, January 19th, 2015 in AVR, USB by DP

USB-Se0Pulse

Ralph Doncaster  writes:

Since the release of V-USB, dozens of projects have been made that allow an AVR to communicate over USB. USB data signals are supposed to be in the range of 2.8 to 3.6V, so there are two recommended ways to have an AVR output the correct voltage. One is to supply the AVR with 3.3V power, and the other is to use 5V power but clip the USB data signal using zener diodes. Most implementations of V-USB, like USBasp, use the zener diodes. I’ll explain why using a 3.3V supply should be the preferred method.

This entry was posted on Monday, January 19th, 2015 at 12:58 pm and is filed under AVR, USB. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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