2 Replies Latest reply on Oct 12, 2011 1:42 PM by steve.groth

    CY8C29666 ADINC14 with 2.5V external ref can't read full count

    steve.groth

      Hi everyone,

         

      I try to read a 0 to 2.5V with the ADCINC14, i use the REFMUX for read 8 port, and I use the external ref (P2[4], P2[6]).

         

      Analog Power : SC On/Ref High

         

      Ref Mux : P2[4]+/-P2[6]

         

      VDD : 5V

         

      P2[4] : 0V

         

      P2[6] : to a ref 2.5V

         

       

         

      Problem; can't read more than ~15818 counts...

         

      2^14 = 16384

         

      ref 2.5V/16384 = 152.588uV

         

      15818 * 152.588uV = 2.414V <- this is my problem, if the input is 2.5V or greater never read more than this.

         

       

         

      Thanks for reading and helping me :)