• on Test & Measurement
  • Published in issue 9/2012 on page 43
About the article

USB: current unlimited!?

E-Labs Inside section

USB: current unlimited!?

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.

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