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MSP430 MCU Current Draw in LPM Mode

Started by mt1985 1 month ago53 views

Hi there.

I have a custom board that designed by me with MSP430FR series MCU. The circuit is designed with low power consumption manners. 

When the firmware is not downloaded to MCU, whole board is drawing only 3,5uA. I think that this value comes from another components (such as leakage current). This magnitude may not matter for me. 

But, When I download code below, the board is drawing 13,5 uA current.

int main()

{

WDT_A_hold(WDT_A_BASE);

PMM_unlockLPM5();

_BIS_SR(LPM4_bits); 

__no_operation();

for(;;)

{

}

}

Where does 10uA diff current come from?