I want to use AD5242 as a digital varistor with single 5V power supply.
so i connected Vdd and SHDN to 5V, I2C interface also pull up to 5V with 4.7K.
Vss DGND AD0 AD1 to ground.
but when i power on 5V, I2C communication fail by can't retrieve ACK from AD5242,
then i connect ground of USB-I2C adapter and ground of AD5242 together, communication succeed for just one time.
then power supply of 5V show over current protection(I limited power supply output current to 50mA).
after i checked the circuit without short circuit and repower on, the communication can't succeed anymore.
I've already burnt 2 chips, could anyone help on this? thanks in advance!
my simple connection as attachment(other pins are floating beside the connection)