AD5144 doesn't load configuration on power-up

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.

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?

Parents
  • Hi Mark,

    the 3 screen shots in the post of 1show terminal voltage at W as yellow C1 and VLogic=+2.5V as red C2 during 3 power-ups.

    Is it also a problem, when the terminals are powered up at the same time as VDD, VSS, VLOGIC? Since it is the same regulator the voltage is coming from, I don't know how to delay it.

    Regards

Reply
  • Hi Mark,

    the 3 screen shots in the post of 1show terminal voltage at W as yellow C1 and VLogic=+2.5V as red C2 during 3 power-ups.

    Is it also a problem, when the terminals are powered up at the same time as VDD, VSS, VLOGIC? Since it is the same regulator the voltage is coming from, I don't know how to delay it.

    Regards

Children
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