AD7997/7998 ALERT/BUSY Pin

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

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