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ADC pin draws much current?

Discussion in 'Microcontrollers, Programming and IoT' started by eem2am, Jun 18, 2013.

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  1. eem2am

    eem2am

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    Aug 3, 2009
  2. BobK

    BobK

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    Jan 5, 2010
    The ADC will only draw current when a sample is being taken. So, the way to deal with high impedance sources is to add a capacitor to ground big enough to supply the needed current when the ADC is sampling, and small enough to be fully charged by the sensor between sampling. This depends, of course, on how often you are sampling.

    Bob
     
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