two ZCDs in a single microcontroller

Discussion in 'Embedded Systems and Microcontrollers' started by han000, Feb 4, 2015.

  1. han000

    Thread Starter New Member

    Feb 4, 2015
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    can any one please suggest me about bellow question
    which microcontroller having two inside zero crossing detector modules inside ?
     
  2. JWHassler

    Member

    Sep 25, 2013
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    Zero-crossing detection is not something that μC's do natively.
    Most applications that you will find are for power-line synchronization, where the input-voltage must be reduced and possibly filtered.
    Only then does the microprocessor see it, presented to an input pin and detected (most reliably ) by an interrupt. Therefore, any μC with two external-interrupts will do it.

    Why do you need two ZCD's?
     
  3. takao21203

    Distinguished Member

    Apr 28, 2012
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    The 16LF1709 does have ZCD

    You could use 2 PICs, and link them up with software serial port.

    I think it only has one ZCD. Well, theres normally only one mains? Even if you have more phases, they are synchronous. Or do you deal with AC generated off mains?
     
  4. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    You could need two if you want to find out the phase difference between voltage and current.
     
  5. han000

    Thread Starter New Member

    Feb 4, 2015
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    ya which microcontroller having two zcds
     
  6. takao21203

    Distinguished Member

    Apr 28, 2012
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    For me its easy to link up PIC, 2 or more, I have experience with it. Usually it only needs slow link.
    Software synchronous is also fast, can use 4 bits if neccessary.
     
  7. han000

    Thread Starter New Member

    Feb 4, 2015
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    i didnt understand
     
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