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TM4C1294NCPDT: Power Consumption using TM4C1294XL

Board Work
Prodigy 10 points
Part Number: TM4C1294NCPDT

How to get power consumption using TM4C129XL board. I got the voltage through the 12 bit ADC and can vary the input using a potentiometer but have no idea as to how to calculate the power output. I need the current, but not sure how to get that. Any advice would be helpful, thanks!

  • 0
    TI__Guru 72500 points

    To measure the power consumption of another device you need a current shunt to convert the current into a voltage that you can measure. Depending on the current magnitude, voltage offset and precision required you might be able to use a low resistance precision resistor and measure the voltage on both sides, you may need to add a current shunt monitor to your design.

  • 0 in reply to Bob Crosby
    Guru 117855 points

    Hello Bob,

    You far better understood & responded to poster than could I - good that.   (I thought that poster (may) have been questioning Pwr drawn by the MCU - which is more usual - here.)

    Perhaps its wise to alert poster that (any) MCU should NOT be employed as, "Beast of Burden" and is NOT CAPABLE of providing more than ~60mW from a single GPIO.    Proper MCU usage then dictates the use of another (external) power supply - meeting the "load's" requirements - with the MCU "reading" both that (external) supply's voltage & current delivery under load - just as you outline...

    Should the load be inductive in nature - great effort must be made to prevent "kickback" voltages from feeding back to the MCU - causing damage...