Gene Heskett wrote: > On Wednesday 08 April 2009, Mike Hansen wrote: > >> Quick FYI: >> >> >> >> The FTDI USB UARTs have noise immunity issues. They tend to lock up after >> running for an hour or so. And worst of all they only reset themselves >> when the USB cable has been physically removed. It's a well known problem. >> I would avoid this chip for new designs. >> >> > I could almost argue the point about FTDI stuff.
I've got a commercial FTDI-based RS232-USB adapter, running under Debian Linux. It's gotten cranky lately, but I don't know if it's related to noise immunity, a driver issue, or impending hardware failure. When it hangs, I have to physically disconnect it from my PC and then re-connect. It was rock-solid before that. If I recall, the PL230x stuff is pretty well supported under Linux now, too. I've got one, it seems to Just Work as well as the FTDI. But I don't use it as often, mostly because it got boxed away somewhere and I can't seem to find it. :) Point is, I can't refute either a 100% success or stay-away-at-all-costs claim for either device. USB-powered devices in general demand good decoupling and filtering on VCC, and maybe FTDI-based products that fail to do that will cause problems. But so would just about everything else. YMMV. b.g. -- Bill Gatliff [email protected] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
