32.786Khz external crystal oscillator

Discussion in 'Embedded Systems and Microcontrollers' started by sen_embedded, May 9, 2010.

Thread Status:
Not open for further replies.
  1. sen_embedded

    Thread Starter New Member

    May 9, 2010
    4
    0
    I'm using 20 PPM, 32.786Khz external crystal oscillator for RTC because of 20PPM I am getting 1.33 sec delay in RTC per day can please let me know to how to get accurate time in this same crystal
     
  2. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    THE_RB has a project that uses a PIC to tweak a crystal oscillator. Basically it adds or subtracts counts to tweak a crystal clock to exact specs. Come to think of it, his web site has some excellent pointers on exactly your query, including crystal ovens.
     
    Last edited: May 10, 2010
  4. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Romanblacks design is what I use for my xtal oven. (not plural, as I only made 1 ;) )
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
  6. maxpower097

    Well-Known Member

    Feb 20, 2009
    795
    388
    What pic you using? PIC24+ has a calibration register to fine tune your rtc.
     
  7. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Please do not shotgun posts all over the forums. The one in Homework Help is the active one.
     
Loading...
Thread Status:
Not open for further replies.