AD5420: fault flag state is indeterminate when digital power is applied first.

Document created by analog-archivist Employee on Feb 23, 2016
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I have no control in my application over when the analogue power is applied to
this device, if digital power (5V) is applied to the IC first, followed by
analogue power (24V), the state of the fault flag is indeterminate – on some
devices it is HIGH and on others, LOW. Is there anything I can do as a software
reset which can ensure the fault flags are consistent?

 

After both supplies are applied, simply issue a reset command to the AD5420.
This can be done as per page 19 of the datasheet. This will restore the part to
it's power-on state.
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