- on Test & Measurement
- Published in issue 9/2012 on page 43
USB: current unlimited!?
E-Labs Inside section
After working on a number of USB-related projects it occurred to me something odd was happening with the power supplied to a connected USB device. I started to doubt the consensus that a USB host device limits the supplied maximum current to 100 mA and only after a connected device identifies itself as being a high-power device, this limit would be upped to 500 mA.