Does Microchip custom USB Driver support Windows Vista?
Release versions 1.3 and later contain an updated driver that works on Windows Vista (both 32 and 64 bit versions). (top) 37. What can be maximum capacitance across Vbus pin of a USB device? Why? The maximum capacitance as seen by the Vbus pin of the USB connector must be less than 10uF. This is to limit the inrush current that goes into the device when it is plugged into the device. The purpose of limiting the inrush current is to limit the drop in the Vbus voltage due to the charging of the capacitors on the newly attached device. Without limiting the inrush current of hot-plugged devices, a newly attached device may cause other devices to stop working. If an application requires more capacitance than the spec allows, a soft-start circuit is required to limit the inrush current to the specified limits. (top) 38. What care should be taken when USB device is self powered? If the device is self powered, an I/O pin must be used to detect a cable attachment. The D+ or D- line must not be
