.------.
         |      |
     Ux  | |\   |   Rint
     ----o-|-\  |  ___       || Cint
      Uref |  >-o-|___|-o----||----.
       ----|+/          |    ||    |
           |/           |          |
                        |   |\     |
                        '---|-\    |      |\ CMP
                            |  >---o------|-\
                        o---|+/      Uint |  >----
                        |   |/ INT    o---|+/
                       ===            |   |/ 
                       GND           ===
                                     GND