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AD5144 doesn't load configuration on power-up

Question asked by ADFAN on May 13, 2014
Latest reply on May 26, 2014 by msamera

I am observing an AD5144 (actually 6 devices tested) not loading its configuration on power-up. On consecutive power-ups the configuration was sometimes loaded sometimes not.

PowerUp.png

The screenshot of the oscilloscope shows the measured supply voltages during power-up.

 

AD5144BCPZ100-RL7

VDD = VLOGIC = RESET = DIS = WPN = LRDAC = 2.5 V

ADDR0 = ADDR1 = 0V

VSS = EXP = -2.5 V

SCL = SDA = floating

 

Has anyone of you an idea on how to solve this?

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