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Troubles using ADS1256EVM

Andrea Pickler
Prodigy 20 points
Other Parts Discussed in Thread: ADS1256

Hello,

i want to use the ADS1256EVM board, but somehow fail to get the thing "running". ( DOUT stays low, doest matter what i do ... )

To test my setup and to reduce possible mistakes on my part, i only supply the board with 5V on +5VA, 3.3V on +3.3VD and the

ground on  DGND. Jumpers are all set to default.

 

On D0 i can see the 7.68Mhz crystal working, so i guess the ads1256evm should be working ? (Tried a second board, same thing ... )

With this set up I assumed to see an periodic state change on DRDY but, DRDY stays high. (should this be?)

 

Did i miss something? Do i have to enable the ADS somehow?

 

thx

 

  • 0
    TI__Guru**** 181021 points

    Hi Andrea,

    Try moving the shunts on J6 and J7 to the left.  The default jumper setting of SYNC/PDWN and the RESET pins places them both under GPIO control from our MMB0.  It sounds like you are simply using the EVM in stand alone mode, so those two pins would be tied to GND through R2 and R3 (see the schematic pg 38 here).  Moving both shunts to the left will pull them high and should give you DRDY pulses.

  • 0 in reply to Tom Hendrick
    Prodigy 20 points

    Thank you.

    Setting the jumpers did it. I now get the signal on DRDY.

    Just to make things clear for me. I use the EVM module without the EVM-PDK, and I want to control and sample the ADS1256

    using SPI. This is possible without the EVM-PDK module, right?

     

    thx for the fast answer!

  • 0 in reply to Andrea Pickler
    TI__Guru**** 181021 points

    Great!

    Yes - the EVM is designed so that you can wire your own processor directly into J2 - the male/female connectors of J1/J2 and J3 simply pass signals through from top to bottom.  You can wire in your SPI controller from either side and can use any available GPIO to control the SYNC and RESET pins by moving those two jumpers back to their original locations.

    Have fun!  Let us know if you need anything else.