6 Jun
2009
6 Jun
'09
6:49 a.m.
I know there
are "FTDI"-based USB seriual converters which would
presumably also have either an external MAXnnn or a bunch of discretes
for a charge-pump and level conversion, but I haven't dismantled any
of those.
The FTDI USB-interfaced UART that I've designed with, the
FT232BM,
does not have on-chip level conversion. My design used a MAX232
powered from the system power supply. (the unit was not powered from
USB)