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/DVALID

Woody Ato
Prodigy 40 points
Other Parts Discussed in Thread: DDC118, SN74AHC1G32

I use the DCC18 und I want do  a daisy-chain with 2 DDC118. I don't  know, if it's possible to  connect  the two (2) /DVALID together. The Data retrieval must be done for 16 sensor simultaneous.

 

Thanks for any input!

 

Arrah

  • 0
    TI__Guru**** 168605 points

    Hi Woody,

    If the two parts are sharing a common clock and CONV, then each DVALID should be aligned within one period of the system clock.  You should be able to simply use one of the two DVALID signals as an interrupt to your processor to start the data retrieval process.  You could also use one of our little logic OR gates (something like the SN74AHC1G32) to tie the two DVALID signals together.

  • 0 in reply to Tom Hendrick
    Prodigy 40 points

    Hi Tom,

    Thanks you for your answer, but I think that AND gate wil perfect. The AND will help me to poll the different DVALID (Dvalid 1 & Dvalid 2). 

    what do  you think?

     

    Thanks

     

    Woody

  • 0 in reply to Woody Ato
    TI__Guru**** 168605 points

    Hi Woody -

    The 'AND' would also work, but you would get a low out as soon as either device had valid data - which one went first though?  Is the other ready too?  Using the 'OR' function would give you a low only when both devices had valid data.