Ideal backup power for PIC micro


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  1. #1
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    Jan 2006
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    Default Ideal backup power for PIC micro

    hi folks!

    Is there any method implementing a backup power system for PIC Micro? Just like the case of DS1302 RTC interfaced to PIC Micro (A real-time digital clock with calendar project). If you want to ensure that the clock/calendar info from DS1302 is up-to-date, then a simple 3v Lithium coin battery is adequate. Even for long-time power interruption.

    Can we do the same approach with PIC Micro (only PIC Micro, the rest of the circuitry is off. A small battery, just enough to let PIC up and running for a long-period with or without power interruption?

  2. #2


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    Default PIC power save mode

    I am not sure what you are really looking for but I have many battery powered PIC projects that run for over 1 year on manganese alkaline batteries. I make sure all peripheral loads can be switched off by the PIC then I call the sleep function (must have WDT enabled for sleep to work). My projects do not need to use a 'wake on interrupt' but instead I have the PIC come out of sleep every 60 seconds and check for certain conditions to decide whether to run the code or go back to sleep.

    I use mainly the PIC16F877A on 4 MnAlk batteries. These give 6.4 volts when fresh and I use no voltage regulator. Section 17.0 of the PIC16F877A data sheet gives a maximum Vdd 0f 7.5 volts so it all works within specs.

    HTH
    Brian

  3. #3
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    thats cool, can you share to me the schematic of your circuit? only the one that is powered by these batteries. I have a simple digital clock (HH:MM:SS) which i would like to run 24x7 with or without power from the mains supply. I'm using a standard wallwart adaptor as my power source. When mains supply is cut off, the next time i power on i have to set the time again.

  4. #4
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    Quote Originally Posted by emavil View Post
    thats cool, can you share to me the schematic of your circuit? only the one that is powered by these batteries. I have a simple digital clock (HH:MM:SS) which i would like to run 24x7 with or without power from the mains supply. I'm using a standard wallwart adaptor as my power source. When mains supply is cut off, the next time i power on i have to set the time again.
    ...............................
    Last edited by skimask; - 22nd March 2007 at 01:19. Reason: Fine example and answer removed to due to possible legal issues....

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