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Hot!RTCC without power in Microcontroller Pic32Mx795F512H

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m_snaeem@hotmail.com
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2020/09/17 00:41:25 (permalink)
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RTCC without power in Microcontroller Pic32Mx795F512H

Hello,
I want to power RTCC when the microcontroller is power off from the cell.
Can somebody suggest me the Circuit or interface circuitry for this purpose?
As I have never worked on this before so I don't have clue how to interface it.
#1

3 Replies Related Threads

    Mysil
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    Re: RTCC without power in Microcontroller Pic32Mx795F512H 2020/09/17 02:50:19 (permalink)
    4 (1)
    Hi,
    There is a RTCC peripheral in the PIC32MX795F512H,
    the chip must be powered all the time for this to function.
    CPU and other peripherals may be in Sleep mode, with only watch crystal oscillator(SOSC), and RTCC counters operating,
    so current will be small, and device may be powered from battery.
    Even during a Reset with power available, RTCC will keep values, but may loose some seconds.
    You may take care in program code, to not initialize RTCC registers, if they have valid time values.
     
    There exists many external RTCC devices that may run for a long time with a small separate battery and it's own oscillator.
     
        Mysil
    #2
    DominusT
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    Re: RTCC without power in Microcontroller Pic32Mx795F512H 2020/09/24 16:40:40 (permalink)
    2 (1)
    I think an external RTCC is preferable
     
    https://www.microchip.com/forums/m399264.aspx
    #3
    karan123
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    Re: RTCC without power in Microcontroller Pic32Mx795F512H 2020/09/28 05:17:50 (permalink)
    4 (1)
    RTC DS1307 with I2C can be used.
    #4
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