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Original question:

ADS1299: How to use ADS1299 properly

ADS1299: Using Internal Clock in ADS1299 GUI

Nicole Angel
Prodigy 30 points
Part Number: ADS1299

Hi,

I am currently trying to use the internal clock oscillator on the ADS1299EEG-FE (Front-end board).

When we try to use the internal clock in the software for the Front-End board, the GUI doesn't seem to work, and the registers just return zeroes. What can I do to debug this? Is it possible that the software does not work with the internal clock?

Thank you.

  • 0
    TI__Guru 66466 points
    Hi Nicole,

    Welcome to our forum and thank you for your post!

    In order to use the internal oscillator on the ADS1299, the CLKSEL pin must be pulled high to DVDD. This is achieved by setting the JP23 jumper to the [2-3] position. Please see Figure 63 in the User Guide schematic.

    Best regards,
  • 0 in reply to Ryan Andrews
    Prodigy 30 points

    Hi Ryan,

    We have tried this multiple times. From the datasheet, we should also pull off the jumper for JP18 (which we did).

    The software stalls, and the registers come back as straight 0's. I am not sure what to try next...

    We need to test the internal clock on the front-end board, because we made a custom board that uses the internal clock. The custom board doesn't work with the TI software either.

    Thank you,

    Nicole

  • 0 in reply to Nicole Angel
    TI__Guru 66466 points
    Hi Nicole,

    The software / device itself may be getting interrupted if you change the master clock source while the board is powered on and the software is running. Can you configure the jumpers for internal clock before power-up and before running the GUI?

    If you've already tried this, I'm also wondering if something is driving J3[2] from the MMB0 motherboard, which could be holding CLKSEL low. We actually don't need JP23 installed at all to use the internal oscillator as R67 will pull-up CLKSEL on it's own. Try removing the jumper from JP23 before applying power. Probe the CLKSEL net (i.e. JP23[2]) and confirm it's set to high before starting the EVM software.

    Regards,