In Reply to: USB Voltage posted by Alun on 05/30/02 at 9:34 AM:
: Developing a USB device using the FTDI chipset.
: It is bus powered.
: It looks like the motherboard is passing an unregulated VCC to the device. With no load ( in suspend for example ) VCC = 7V.
: Typically when doing stuff it drops to 5.7V.
: I suspect it has just killed some other devices on the board. Things got very hot and stopped working.
: Quesion is : is this a rogue motherboard ?
: Or should I add over voltage protection to the my design.
I would ask that on http://www.usb.org/forums/developers/webboard.html
Did you read the USB spec?