can I change driving current used in impedance calculation?

Arti20132Arti20132 New Zealand
edited June 25 in Cyton
Hi team,

I am wondering how to change the driving current (~6nA) for impedance checks? - I want to do this for a stimulating channel (applying a small current to an electrode).
is it in an Arduino script?



  • wjcroftwjcroft Mount Shasta, CA
    Arti, hi.

    You've likely looked at page 49 of the data sheet. The LOFF register there, bits 2 and 3 set the injection current used,

    Note this is an AC frequency of 31.2 Hz for the impedance calculation. Probably not suitable for what you are attempting.

    Another possibility to consider is to use a GPIO output pin (either operating as digital or analog), and your own voltage divider network to create whatever voltage you require. If you need current control there are ICs that do that as well.



  • wjcroftwjcroft Mount Shasta, CA
    See line 794,

    Can you mention your application for current injection? Even the max possible set in the LOFF register, 24 microamps, is not very much current. .024 milliamps. 

  • Arti20132Arti20132 New Zealand
    Hello William,

    Thank you so much for your help. 
    This answer solved all my questions. I will have a look at by GPIO and ICs pins instead. 

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