Chathrapathi P

MCF5282 QADC problem

Discussion created by Chathrapathi P on Oct 19, 2011
Latest reply on Oct 24, 2011 by ioan petrescu

Is MCF5282 QAdC module works fine only for  reference voltage of  5V ?.


I have connected analog supply of 3.3v to VDDA  and VSSa and reference voltage levels are also connected to 3.3v(VRH) and  0v(VRL). it's not working. Result registers are not updating when the analog input is varying. Registers are updated either with 0 or 0x3FF. (Register value is 0 if the voltage is below 3.3 and 0x3FF for above 3.3. )


pls suggest me