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ADS1299-6: Channel1;3;5 are bad if I sample with higher as 500Hz.

Stefan Erni
Intellectual 550 points
Part Number: ADS1299-6
Other Parts Discussed in Thread: ADS1299

Hi

I have a problem what i did not yet solve.

If  I sample with 500hz all the 6 channel are perfect.

When I sample with 2000Hz then Channel1;3;5 are bad. There read 4 times the same (like as if there are set to  500hz sampling ) but thats not posible.

but if I read just Ch1, Ch2, Ch3  this 3 channels are ok.

I tried a lot but always this problem. 

I asked this in Aug. 2018 but I can not jet solve it. Maybe there is new ideas?

e2e.ti.com/.../720802 4 times

  • 0
    TI__Mastermind 47625 points
    Welcome back Stefan!

    Are the issues the same or have they changed?
    Hardware wise, has anything changed on the design?
    Were you able to re-write your code?
  • 0 in reply to Alexander Smith
    Intellectual 550 points
    Hi Alex

    In the meantime, I have put the remaining hardware in operation and written the rest of the software.How nice the ADS1299 works together with a small oled you can see here with the link. Also, the data from the ADS1299 can very easily writen to a microsd card and watch the signals on the PC afterwards. Also, the hard and software is stable working for more than 8 hours, without problems. But what exactly causes me problems with the 3 channels, I do not know yet.

    regards
    Stefan


    www.matrixtsl.com/.../viewtopic.php

    Are the issues the same or have they changed? / no the same
    Hardware wise, has anything changed on the design? / no but soon I start produce the next small serie
    Were you able to re-write your code? I add some code
  • 0 in reply to Stefan Erni
    TI__Mastermind 47625 points
    Hi Stefan,

    That's really neat! I'm happy to see that the oled is working well.

    Unfortunately, the conclusion we came to on your last thread remains the same. I don't have any additional advice outside of re-writing your code. The symptoms and setup have not changed, so the root cause most likely remains the same.
  • 0 in reply to Alexander Smith
    Intellectual 550 points
    Hi Alex

    I've changed and checked my code many times already. But I suspect the problems do not come from reading the bit but from configuring and starting the ADS1299. I suspect I'm doing something wrong. I also found an info about it. Now I have the possibility to adjust the hardware or change.


    e2e.ti.com/.../2868427