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K60 - using VREGIN pin in USB device mode

Question asked by panpwr on Jan 2, 2013
Latest reply on Oct 8, 2014 by jonathan pry

Hello,

 

I couldn't find an explanation regarding the logical role of this pin. I understand that - electrically - it takes an input of 5V from the USB device, and outputs 3.3V through VOUT33 pin - in order to use it for powering the Kinetis circuit.

 

However, I already power the circuit from an external 3.3V source, so I don't need this functionality. Nevertheless, the device won't work in USB device mode (no events are triggered to SW) if this pin is not being supplied from the USB device with 5V.

 

Is there a way to disable the usage of this pin using SW, or I would have to connect it to the USB device's VCC line?

 

Thanks,

Lior.

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