Timeline for Can the power source for a USB device be different from the data source?
Current License: CC BY-SA 3.0
3 events
| when toggle format | what | by | license | comment | |
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| Aug 1, 2014 at 14:49 | comment | added | Chris Stratton | If you apply a higher voltage to the VBus pin than the host is driving it with, power will flow into the USB port. Generally this isn't a good idea, though if you know the internal circuitry it may be workable (for example, a raspberry pi with the port polyfuses shunted or increased in rating could actually be powered this way, rather than via its power input connector). But something like a phone with a charge pump to create VBus (when in host mode) from a lower battery voltage could conceivably be unhappy indeed. | |
| Aug 1, 2014 at 13:41 | comment | added | timonsku | How would it be able to back power the data host? | |
| Jul 31, 2014 at 21:11 | history | answered | pjc50 | CC BY-SA 3.0 |