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REF3225 the enable pin is not valid

Other Parts Discussed in Thread: REF3225

dear,my schematic is as follows,i want to control the enable pin by a singlechip,when the enable pin is 3.3, the pin 5 and 6 will output 2.5,but when the when the enable pin is 0,the  the pin 5 and 6 will output 2.5,so i dont know why