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USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.

You can try to disable/enable the Raspberry's USB ports depending on whether or not you want the camera to detect a data connection, To shut off power on USB ports (this shuts power on ethernet … as well): echo '1-1' | sudo tee /sys/bus/usb/drivers/usb/unbind To turn power back on echo '1-1' | sudo tee /sys/bus/usb/drivers/usb/bind ( …
answered Apr 10 '18 by JimmyB
Take a look at the USB charging specification. There are numerous ways manufacturers today implement negotiation of USB currents. The standard USB way is, as was mentioned, requesting the current by … message exchange with the USB host controller. However, many devices don't bother with the complex USB protocol and just draw as much current as they require - until the supply voltage drops. That …
answered Sep 15 '14 by JimmyB
Yes, the 7805 does work with Vin of 12V. And the other device can be powered from the same 12V with its own regulator for whatever voltage it needs, e.g. 7809 for 9V. The only thing to note is the cu …
answered Nov 7 '12 by JimmyB
., they take as much power as they can up to their designed maximum. Well-behaved devices take care not to overload the USB port, others (cheaper ones) don't care. And because they don't expect to get … more current than the USB port/charger will provide, in which case the voltage from the port will drop, which reduces the current the power bank draws for charging and thus stabilizes at the minimum of …
answered Apr 30 by JimmyB