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.
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?
the 3 screen shots in the post of 14.05.2014 show 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.