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Powering the ADS1299EEG-PDK board without an mbb0

joao costa
Prodigy 95 points

Part Number: ADS1299EEG-PDK

Hi TI,

I am doing a project where I need to connect the ADS1299EEG-PDK card and transmit the collected data to a raspberry.
Which ports do I need to power and which ports do I collect the data?

Through the schematic, I discovered that the feed would be via j4 port and communication by j3, however I was afraid to burning board.
Could you please confirm if these links would work and inform me how I collect the ADS data?
  
Thank you!
  • 0
    TI__Guru**** 180961 points
    Hi joao,

    Welcome to our e2e Forum! J4 is correct, however you don't necessarily need the 1.8V. For J3 however, pin 1 goes to the chip select input of the ADS1298, so that should go to a GPIO on your controller, not the clock. You don't need a connection on pin 2 since JP23 will allow you to select GND or DVDD to configure CLKSEL. Pin 8 should also go to a GPIO so that you can reset the ADS1298 as needed. Pin 15 is the DRDY signal, you'll want to tie this to an interruptable input on your controller.
  • 0 in reply to Tom Hendrick
    Prodigy 95 points

    In reply to Tom Hendrick:

    Hi tom,

    Thanks a lot for the help!

    Following your suggestion, would this be the correct scheme?

    Do these setting also apply to ADS1299?

    Regards,

    João

  • 0 in reply to joao costa
    TI__Guru**** 180961 points

    Looks good!  And yes, this would also apply to the ADS1299EVM.

  • 0 in reply to Tom Hendrick
    Prodigy 95 points
    Hi Tom,

    thank you for the informations

    I energized ads1299 and got the results:

    Test Point Voltage:
    TP7 + 5.0V
    TP9 +0
    TP10 + 3.3 V
    TP5 + 5.0V
    TP13 + 2.5V
    TP6 -0
    TP8 GND

    TP9 and TP6 are not equal to the values ​​in the manual, is this expected?

    Regards,

    João
  • 0 in reply to joao costa
    TI__Guru**** 180961 points

    Hi Joao,

    If you look at Figure 62 in the ADS1299EEGFE-PDK users guide, you should see an explanation for the lack of 1.8V on TP9.  Since you have 5.0V on TP7, you have to track back a little to figure out why you do not have -2.5V on TP6.  Please refer to Figure 60 in the ADS1299EEGFE-PDK users guide and see what voltage is on TP4.  TP4 is fed by a charge pump (U6) that takes the same 5V on TP7 and inverts it.  That -5V then feeds a -2.5V regulator (U8) which should be the voltage found on TP6.

  • 0 in reply to Tom Hendrick
    Prodigy 95 points
    Hi Tom,

    Thanks for the attention and help, I will continue to carry out tests.

    Regards,

    João