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Power USB subsystem without +5V

Question asked by B B on Mar 21, 2017
Latest reply on Mar 28, 2017 by CarlosCasillas

Hello,

 

I have a small question. Is it possible to power VDDUSB_CAP ourselves? We changed our board design and do not have a +5V supply any more. Page 25 of the datasheet mentions it needs a minimum of 4.4V on either USB_OTG_VBUS or USB_H1_VBUS to power the internal 3V0 LDO.

 

Since we do not have 4.4V, i want to power it myself. Is this possible? And if yes, what precautions should i take? Such as USB_H1_VBUS GND/floating and/or registersettings.

 

Thanks in advance!

 

Kind regards,

Boudewijn

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