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MSP432P401R: Measuring current consumption of MSP432 launchpad by measuring resistance between its two terminal.

TapasXplore
Expert 1280 points

Part Number: MSP432P401R

Hi,

I am using msp432 microcontroller for an application, the current consumption of the microcontroller is around 80mA, I think that a lot of current. 

Incidentally, I have MSP432 red launchad with me, and I measured the resistance between Vcc and ground (image shown below), multimeter is showing 33 ohm. If we calculate the current from this it is 3.3V/33ohm  = 103mA. It this the correct way of measuring resistance and inferring current from it.

Regards,

   

  • 0
    Genius 3255 points
    For measuring current consumption, I would instead recommend removing the jumper from the 3V3 (at the dotted silkscreen line) and using a multi-meter between the 2 terminals. That should directly give you current consumption, without the need of any further calculations.
  • 0
    TI__Expert 8510 points

    Tapas,

     Measuring the resistance in this way is not the correct way of measuring current . To measure current, you should either use EnergyTrace+ from within Code Composer, or pull the jumper on J101 that connects the 3.3v supply to the MSP432 and connect the top and bottom pins to a multimeter as shown below. You should use a multimeter capable of measuring microAmps (μA range shown on the multimeter in the picture).

     If after setting up your measurement this way, you still find that you are reading 50mA+ of current, then this indicates your board may have suffered damage due to some kind of electrical overstress. (i.e. if you had accidentally connected 5V to the 3.3v supply). I would suggest comparing your measurements with another LaunchPad running the same code to confirm this.

     

    Regards,

      Bob L.

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