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The reference voltage of ad7606 adopts internal. During hardware debugging, the output voltage of refin / refout pin is 2.41v after power on, and the frstdata pin is low. During code debugging, busy is always at low level and frstdata is always at high.

Hello everyone!The reference voltage of ad7606 adopts internal mode. During hardware debugging, the output voltage of refin / refout pin is 2.41v after power on, and the frstdata pin is low. During code debugging, busy is always at low level and frstdata is always at high level( After the power on has been completed, give reset an 80ns high-level pulse). I would appreciate your advice.

The figure below is the design schematic diagram of ad7606, in which avcc is 5V and vdrive is 3.3V。