For proper operation the datasheet says: VCCA must always be less than VCCY but
inside the data sheet,
on the Power Requirementssection, it is described that VCCA can be equal to
VCCY. You have a contradiction in your datasheet. Can I work with VCCA = VCCY?
VCCA must be LESS THAN or EQUAL TO VCCY. The information in the datasheet is
correct but could be stated more clearly. It is ok for you to use VCCA = VCCY.