To summarise the specification each output is capable of supplying 500mA at 5 volts protected by a self resetting fuse or other device. A hub which has it's own power supply should be capable of supplying 500mA out of each of it's 4 outputs. However, when purchasing a hub check that the power supply can output 2 Amps, some manufacturers save money by bundling a smaller power supply. If a hub is being powered from a previous hub then the 500mA is divided between the hub controller and the 4 output ports which is where the 100mA comes from. Actually the current does not have to be equally divided provided the total current drawn from the feeding hub does not exceed 500mA. Regards Chris Carr ----- Original Message ----- From: "Kathy Quinlan" To: Sent: Saturday, November 24, 2001 6:48 AM Subject: Re: [AD]: Add USB to your product in 10 minutes. > > >Are these chips bus powered? Do they provide a means to power your > > >project from the bus too? > > > > Yes, they are powered from the USB bus. It's four wires - two are the bus > > and then there's +5 and ground. > > > > There are companies that sell USB-powered lights for illuminating your > > laptop keyboard :-) > > > Also USB phone rechargers :o) which makes me think we can pull a fair amount > of power out of the USB port :o) > > Regards, > > Kat. > ____________________________________________________________________________ > /"\ ASCII Ribbon Campaign | K.A.Q. Electronics > \ / - NO HTML/RTF in e-mail | Software and Electronic Engineering > X - NO Word docs in e-mail | Perth Western Australia > / \ | Ph +61 419 923 731 > ____________________________________________________________________________ > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics