>------+--------+-+-+-+-+
in     |        | | | | |    _
       |        +---------->| | analog switch
     INT       | | | | |   | | 
                | +-------->| |
                | | | | |   | |
                | | +------>| |
                | | | | |   | |->-- ADC
                | | | +---->|_|
                | | | | |
           C1-5 = = = = = 
                | | | | |
                +-+-+-+-+-V GND