2 Replies Latest reply on Jan 24, 2013 5:14 AM by rama.sai.krishna.vakkantula

    Confused in VBATT&VBUS

    mo.lee

       In AN70707.pdf(FX3 Hardware design guidelines...),  "VBATT  is  a  power  input  to  the  USB  PHY.  It  is 

         

      internally  regulated  to  3.3  V.  When  VBUS  is greater  than  3.7  V,  VBUS  becomes  the  primary supply  to  the  USB

         

      circuitry  unless  there  is  a  software  override.  VBATT  pin  can  be  left  open  if  not used."

         

      I'm confused, please explain and provide an example.