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AD5724 Write issue

Question asked by james13 on Mar 14, 2017
Latest reply on Mar 17, 2017 by msamera

Hello,

We have a write issue after power up. The first write to set the output range is sometimes ignored. We found that to write twice has improvement. The digital input pins are pull-up to DVCC on the board. So, DVCC and digital inputs become high at the almost same time. We guess it is related to the sentence below.

Page 20 CONFIGURING THE AD5724/AD5734/AD5754

'The DVCC must be brought high before any of the interface lines are powered. If this is not done, the first write to the device may be ignored.'

Could you let us know why the first write is ignored when the DVCC isn't  brought high before any of the interface lines are powered? We'd like to know about internal mechanism in order to take measures.

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