We're getting ready to ship a bunch of systems to our fire prevention customer, and to our horror found that the FTDI 230 USBserial chip was getting super hot and shutting down.
After a bit of digging around, it turned out to be a Sabrent HB-U14P USB which was dragging USB- *below ground* by about 400 mV. Works fine with a normal 0-3V swing on the USB.
I bought the thing off Amazon, so it should be legit, but whoever heard of a USB hub with a negative supply internally?
A pity--I've had good luck with Sabrent gear up till now.
Anybody got a fave decent-quality USB hub?
Cheers
Phil Hobbs