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hello! i've a question about the power supply of the USB module of c55x. in c55x,the usb supply voltage (USBVdd) is the same level with the io,+3.3v, but in the USB1.1 specification, the Vbus voltage should be +5v. does it mean it cannot be connected directly through a usb connector to usb host? |
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about USB module
Started by ●July 30, 2003
Reply by ●July 30, 20032003-07-30
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dizzybeetle wrote: > in c55x,the usb supply voltage (USBVdd) is the same level with the > io,+3.3v, but in the USB1.1 specification, the Vbus voltage should be > +5v. does it mean it cannot be connected directly through a usb > connector to usb host? USBVdd is nothing else then power for IO pins of USB. It needs to be about same then IO voltage. Therefore, most reasonable thing to do would be to connect USBVdd to IO power supply. Indrek. -- Indrek Rebane | OU Borthwick-Pignon Electronics Engineer | Tartu Science Park Phone: (+372) 7 302 641 | Riia 185, 51014 Tartu Fax: (+372) 7 383 041 | Estonia | http://www.bps.co.ee |
