AnsweredAssumed Answered

AD5412 output dropped!

Question asked by meerkat on May 8, 2015
Latest reply on Jun 1, 2015 by meerkat

Hello

 

I have written another post about this issue but the main title typed wrong and i couldn't edit .

So i decided post new discussion .

 

Problem :

Actually AD5412 works apparently correct ( I mean I send the command and proportionate voltage/current is on the output ).

But when I connect my voltmeter or oscilloscope to the output the output drop to the clear value( Zero or middle depend on setting) .

 

it happen even when i connect a screw driver(metal object) to the ground .

 

But when voltmeter or oscilloscope is connected before power up every things is ok .

 

Fault Pin is not active before or after voltage drop.


after output dropped  if i write   new value it's  appear on the output.


after output dropped data register is dropped too.


87.PNG

"Clear Select " and "clear" pins are  connected to the ground just in case .


and here is my spi bus

9.PNG


i am be very happy if analog device support help me .


Outcomes