Total Power Needed For Multiple Devices

jruel4jruel4
edited August 2014 in Cyton
Hello! I've created a board that will house 8 ADS1299's chained together and am getting ready to send it off to get printed, but I am unsure of what the power needs will be. The data sheet says momentary current should not exceed 100mA, and the continuous current should not exceed 10mA. The "typical" values for digital current draw and analog current draw are 1mA and 7.14mA, respectively.

Currently I've got regulators that support 200mA for analog, and 250mA for digital. Should I be upgrading these to handle, maybe, 500mA for analog and 400mA for digital? Or possibly 800mA for analog? The ADS's are the only things that are drawing power from the circuit.

I'll be posting the schematics and board files online once they're complete.

Cheers!
Jack

Comments

  • wjcroftwjcroft Mount Shasta, CA
    Jack, wow, 64 channels. Can you say a little bit about your application area? Are you using something like the Geodesic Sensor nets? http://www.egi.com/clinical-division/geodesic-sensor-nets Sounds like you are going for a battery power supply. CPU, USB details? 24 channels (3 ADS1299) is a nice size for the neurofeedback community because the standard Electrocaps are 19 channel.

    William Croft
  • biomurphbiomurph Brooklyn, NY
    Hi Jack,

    Our OpenBCI system draws about 48mA when sampling data. That includes the on-board microcontroller. What microcontroller are you using?
    I think it's best for you to calculate the current draw of your system, and design your power supply to be way overbuilt. Also don't use a fancy or non-standard power supply compotnents (Vregs, diodes, etc) so that you can replace if you need to :)

    Then, you will be able to get actual current behavior from the circuit and fine tune your design. 
    Always best to over-build!
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