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The questions about the control bits of the DAC084S085

Jacky Chen29
Genius 4735 points
Other Parts Discussed in Thread: DAC084S085

Hola,

DAC084S085 has four control bits and they are A1、A0、OP1、OP0.

And I saw the description of the OP1 and OP0 below in datasheet：

My question is that what the different of the output between of them as below description？

Writing to a DAC register and updating the outputs of all four DACs

Writing to the register of all four DACs and updating their outputs

Writing to a DAC register and updating the outputs of all four DACs --> Is that mean it is only update output of the responding wrote DAC, others are kept on previous output？or four DAC will be updated to wrote DAC value？

  • 0
    TI__Genius 16890 points
    Hi Jacky,

    That is correct, if you have not updated the other three DAC, their outputs will not change.

    This is how these commands can be used.

    If you want to update all the DACs at the same time with different values you would send:
    0000DDDDDDDDxxxx - changes the value for DACA but does not change the output
    0100DDDDDDDDxxxx - changes the value for DACB but does not change the output
    1000DDDDDDDDxxxx - changes the value for DACC but does not change the output
    1101DDDDDDDDxxxx - changes the value for DACD and updates the outputs of all the DACs

    If you now send:
    0001DDDDDDDDxxxx - it will change the value for DACA with the new value and updates all the DAC outputs. DACB, C and D will have the previous value written.

    Mike
  • 0 in reply to Michael Stout
    Genius 4735 points
    Hola Michael,
    Clear and helpful. Thank you very so much.