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ADS8365 + MSP430F2xxx

Cmos
Prodigy 20 points
Other Parts Discussed in Thread: ADS8364, MSP430F449, ADS8365

Hi,

I have my own sistem, ready to start debug,

 

I have ADCCLK=2MHz, and I have EOC toggling after an SOC ( siumultaneous at the 3 pair channels).

CS and RD are working fine too. I m using ADC configuration by HW, No ADD, and usin 16 Bits as Output

 

But happens that I have no significant outdata from ADC.

 

can you give an tip?

thx

 

reach me at: asilvaeneida@gmail.com

 

 

  • TI__Guru**** 174620 points

    Hi Antonio,

    Can you provide a little more detail on what you mean by 'no significant data'?  Perhaps there is something in your software.  I put together a little bit of code for the ADS8364 and the MSP430F449 a couple years ago - you can find it here:

    http://focus.ti.com/analog/docs/litabsmultiplefilelist.tsp?literatureNumber=slaa150&docCategoryId=1&familyId=390

    The only real difference between the ADS8364 and ADS8365 (pin functionality wise) is the additional of a NAP pin (pin 20 on the ADS8365, N/C on the ADS8364).  The code may help, not really sure at the moment.  If you could perhaps share a snippet of your schematic around the ADC and maybe a scope trace of your control signals, we might be able to point you to a potential source of the problems you are facing. 

  • in reply to Tom Hendrick
    Prodigy 20 points

     

    Hi Hendrick,

     

    Here is snippet of myschematic around the ADC.

     

    I added also the screenshot of the Digital signaling. 

    The output data is jumping, ans do not reflect the signal input ...

     

     

     

     

     

     

     

     

     

     

     

     

     

  • in reply to Cmos
    TI__Guru**** 174620 points

    Hi Cmos,

    The LogicPort is a great tool isn't it?  I don't see anything off hand in the schematic that would cause your erroneous readings from the ADS8365.  Have you looked over the code I pointed you too?  Is there anything in the way you are doing port reads from the MSP430 that might be an issue?  Can you try simply applying a DC voltage - say 2.5V to the inputs and let me know the resultant codes you get?