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Microcontroller current draw?

Discussion in 'Microcontrollers, Programming and IoT' started by eem2am, May 13, 2013.

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  1. eem2am

    eem2am

    422
    0
    Aug 3, 2009
    Hello,

    We are using the Atmel SAM3N00B micro.
    We set the supply monitor to 3V.
    Why is it that when the micro's supply rail gets near 3V its current draw goes up by 3mA (from 1mA to 4mA)?

    SAM3N00B MICROCONTROLLER DATASHEET:
    http://www.atmel.com/Images/doc11011.pdf
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,838
    Jan 21, 2010
    Does your circuit operate correctly from a lower voltage (where it draws 1mA)?

    Are there any voltage references in your circuit that are around 2 to 3 volts (other than the power supply)?
     
  3. eem2am

    eem2am

    422
    0
    Aug 3, 2009
    Thanks, it was the micro's DAC voltage dropping out when the rail went <3V...this made something else draw more current.
     
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