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ADS 1282 DRDY does`t work?

Maxim69201
Prodigy 40 points
Other Parts Discussed in Thread: ADS1282

Hello.

I have problem with ADS 1282. CLK - 4 MHz. Scheem connceted ADC as fig.40 in the datasheet.

DRDY pin work not well. It`s never goes to low.

I have next figures: 1- SCLK, 2- Dout, 3 - DRDY pins

 

 This is pictures like fig 30 in datasheet ADS1282 page 21.

I try work in continius mode (by default). I uderstad that DRDY must be high and then new data ready it goes to low. I can`t see it

What i do wrong?

Thank a lot for help

 

  • 0
    TI__Guru 55466 points

    Hi,

     

    I need to ask you a few questions to ensure I understand the set up:

     

    On the oscilloscope plot, channel-3 DRDY is always low.  Is the DRDY pin set as an input on your processor (DRDY is an output of the ADS1282)?

    What pin is channel-4?   Attached is the most recent ADS1282 datasheet; can you please confirm the figure you are referring to?  

     

    Thank you,

     

    Regards,

     

    Luis

    0118.ads1282.pdf

     

  • 0
    TI__Guru**** 181831 points

    Hi Maxim,

    What version of the ADS1282 data sheet are you referring to?  Figure 30 in the current data sheet is the overall block diagram and Figure 40 is the timing of the Modulator Mode output.  Can you perhaps sens along a schematic showing how you have the device connected to your controller and a bit of detail on how you have registers configured?

  • 0 in reply to Luis Chioye
    Prodigy 40 points

    Hi Luis and Tom.

     I found my mistake yesterday. I had two errors  in a scheme and in another program.

    Yesterday I was a little despair solve this problem and wrote to the forum. :)

    Now ADC works well in the continuous mode, and read by command mode.

    Now I will try to synchronize the data read  form two ADC.

    Thanks a lot for help.

    Regards, Max