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brown out reset

hardik padhariya
Prodigy 150 points

Hello...

             What will happen if microcontroller detects brown out reset continously?(if we supply uc with battery and battery get discharged.)

            and

            Reset switch is pressed for some time (e.g. 10 sec)continously?

            

  • 0
    Intellectual 660 points

    Hi Hardik,

    Are you talking about MCUs/MSP430's in general or do you have a specific one in mind? 

    Generally speaking the brown out problem you describe exposes a common problem for battery powered designs that is not so often thought about.

    The scenario is:

    - Device is running from the battery and the battery starts getting low.

    - The low battery is either detected by the mcu and its goes into power down mode or the brown out circuitry fires and turns off the mcu. 

    - This results in a lower current drain on the battery, and so the battery voltage starts to creep up again. 

    - The battery voltage gets to a point where it is high enough for the mcu to start up again or brown out circuit to release the mcu. 

    - The increased load now causes the battery voltage to sag again and the cycle repeats.....

    - Depending on the application and the time between these cycles this might not be a problem. But it should be considered. 

    - One solution is for the mcu to engage an end of life load to stop the battery springing back. 

    Regarding holding the reset low for 10s, I can't see any problem there.

    Mark.

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