February 22, 2011
about 4 years ago
I read your post and thought you were right, but when I saw that this board has a 2.8V branch I knew that it was for the cmos levels.
If you look at the datasheet for the USB FTDI chip you’ll see that pin VCCIO sets what logic level the chip uses. In this case 2.8 V is supplied to VCCIO by regulator U3.
From the datasheet:
5V / 3.3V / 2.8V / 1.8V Logic Interface - The FT232R provides true CMOS Drive Outputs and TTL level Inputs.
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