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Can ADS1299 powered by button cell?

Other Parts Discussed in Thread: ADS1299, CC2650

I am trying to build a portable wireless EEG system using ADS1299. The analog supply voltage and current of ADS1299 are 4.75~5.25V and 7.14mA respectively.

And for the control and wireless MCU I am considering CC2650 (1.8~3.8V, 6.1 mA @ Active-mode TX ). I think the current supply of the whole system should be more than 20mA taking other components into consideration. Can button cells power up a system like this? I found the standard discharge current of common button cells(CR2477,CR2032,et al.)is less than 1mA, which is too small for ADS1299.

The system is size critical so the smaller battery size the better, and the system should last at least 10 hours hopefully. Is there any suggestion on which battery should be used? Thanks!

Regards,

Eric

  • Hey Eric,

    After doing a little research on Digikey, I could not seem to find any button or coin cell battery that would typically discharge more than a few hundred microamps. My sense is that you're going to have to move to something a bit bigger, but I don't know very much about batteries so I don't feel comfortable recommending one for you. Perhaps another community member knows more about batteries.

    Regards,
    Brian Pisani
  • Hi Brian,

    Thanks, maybe I will use other batteries instead.

    Regards,
    Eric
  • Hi Brian,

    I found these batteries:
    www.fdk.co.jp/.../CR1_3N_spec-sheet.pdf
    media.digikey.com/.../2CR-1-3N.pdf
    They both can provide max 60mA current continuously. Do you think they can power up my EEG circuit (ADS1299+CC2650+other necessary components)? Which type is better? In my opinion, two CR-1/3N are better because they can provide more capacity, right?
    Besides, what can be done to extend the lifetime of the battery? I read www.ti.com/.../swra349.pdf, is this approach applicable for my system?
    P.S. Could you please send the password of ftp.ti.com/.../ADS1299EVM.zip to yitian2@cityu.edu.hk? Thanks.

    Regards,
    Eric
  • Hey Eric,

    I'm not a battery expert so I do not necessarily want to give you a firm recommendation on the type of battery to be used. However, it does look like those batteries are rated for the amount of current you are expecting to draw. I'd have to imagine the topic of extending the lifetime with different battery configurations is pretty complex; and well outside of my area of expertise. If you're looking for strategies for extending battery life, I'd recommend looking here: e2e.ti.com/.../battery_management

    You will receive an email shortly with the details regarding the requested files.

    Regards,
    Brian Pisani