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KL27Z256VFT4 Using external reference on VREFH?

Question asked by Seth Esther on Sep 14, 2017
Latest reply on Sep 15, 2017 by Robin_Shen

We are using the KL27Z256VFT4 in a project currently in development.  It seems that the VREFH cannot be used with an external reference.  When attempting to use a 2.5 volt reference connected to VREFH the adc conversion consistently reads 0xFF.  I have verified that the internal reference is off and that the source for the ADC reference is set to the VREFH/VREFL pair.  Is there something I am missing?