AD7997/7998 ALERT/BUSY Pin

For the AD7997 / AD7998 If the ALERT/BUSY functionality is not being used can the ALERT/BUSY pin be left float or must it be tied high or low?  I see guidance here to tie the CONVST pin low if it will not be used but do not see anything specific to ALERT/BUSY.  Preference of course is leave it float.

thx - sean

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  • +1
    •  Analog Employees 
    on Oct 1, 2019 1:47 PM over 1 year ago

    Hi Sean,

    The ALERT/BUSY pin can be left floating if you do not plan to read its state. I would recommend leaving the ALERT and BUSY functionality disabled in this case (via D2 and D1 in the configuration register, see page 19). They are disabled by default anyway though.

    Thanks,

    Tyler

  • Hi Tyler - yes that answers my question.  Based on this I can leave ALERT/BUSY floating and based on what I’d read elsewhere I must tie CONVST low if not used.  I currently have both floating and am seeing it return reads from channels that differ from what I’ve programmed it to read from which, I presume, is because CONVST is floating.  Once I’m back in front of my prototype I will tie CONVST low and confirm It is reading only from the channel I’ve programmed it to.  I am using it in Mode 2.

    thx - sean

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  • Hi Tyler - yes that answers my question.  Based on this I can leave ALERT/BUSY floating and based on what I’d read elsewhere I must tie CONVST low if not used.  I currently have both floating and am seeing it return reads from channels that differ from what I’ve programmed it to read from which, I presume, is because CONVST is floating.  Once I’m back in front of my prototype I will tie CONVST low and confirm It is reading only from the channel I’ve programmed it to.  I am using it in Mode 2.

    thx - sean

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