Re: USB interface question.
- From: "siliconmike" <siliconmike@xxxxxxxxx>
- Date: 10 Jun 2006 05:14:38 -0700
petrus bitbyter wrote:
"siliconmike" <siliconmike@xxxxxxxxx> schreef in bericht
news:1149930411.747592.301740@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I'm newbie at USB, if someone can help it would be wonderful:
I'm envisioning a gadget that would take input from a USB port on a PC
(or any USB host). And it would act as a UPS for four downstream USB
devices, providing currents upto 1A.
In other words, the gadget would have 4 USB sockets for output, capable
of providing upto 1A to devices connected to it.
I have done some reading on USB but would like to ascertain whether the
gadget needs to have a controller / or can it be a passive device, as
far as the USB interface circuitry is concerned ?
(of course, the gadget would have its own separate supply, from where
it will derive the UPS power)
-Mike
Mike,
Buy a simple externally powered USB-hub. The ones I have simply connect the
5V to their power outputs, so they pass all of the current the power supply
can provide to the USB-devices. I even saw some (older) PCs that has
connected their 5V power directly to the USB. (Way beyond spec and risky of
course.)
petrus bitbyter
The gadget I mentioned is part of a bigger project. I mentioned it
separately only to simplify conversation.
-Can I just short the D+ pin from input to output ports
-Then short the D- pin from input to output ports
-Provide a separate 5V VBUS+ to output port
-Provide a common shorted GND.
Or is this a disaster eh?
Mike
.
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