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AD2S1210 position problem: The position we read from 0x80 and 0x81 is 0xffff,when Add half a circle

Hi  ADI guys,

  We use AD2S1210 ,set 16bit resolution

Now we face a problem, the position we read from 0x80 and 0x81,when add half a circle,

is it right?

 thanks a lot!

  • fen1985,

    The short answer most likely no but that depends on your setup.   For example what resolver are you using and is it a single turn or multi-turn output?

    Some additional information about your setup that might help you self diagnose the problem are as follows.  If you're still stuck please send additional information about your setup and we'll try to get you up and running as quickly as possible.

    1) Which interface mode have you selected, parallel or serial?  Is the SOEN pin configured in the correct state for that selection?  In your next post if you could provide scope captures of your interface timing or timing diagrams which describe what you are doing that would be helpful.

    2) You appear to be attempting to read the position in configuration mode are A1 and A0 set appropriately (A1 = A0 = 1)?

    3) When you modified the resolution bits externally (RES1, RES0) did you make the corresponding changes to the internal control bits?  If not this can cause issues with the tracking loop.