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ADN8810 issue


i try to use the ADN8810 ( current driver) to control a lens that required 300mA. i used the fig 1 of the data sheet encomp is set to gnd . /Reset and /SB to dvdd ( 5V) , Pvdd is set to 3.3V , vref to 4.096V using LM4128 and the spi is coming from a µcontroller, the 3 signal looks ok i also check the clock rising edge on the /CS.

the Fault signal is always at 5V and the Iout is at 86mA without any change.

if anyone have an idea......... thankssssssssss

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