Replacing 3PIN ceramic resonator with 2PIN

Discussion in 'General Electronics Chat' started by vventura, Jun 19, 2008.

  1. vventura

    Thread Starter Member

    Jan 21, 2008
    10
    0
    Hello

    I have the controller in the image, but its not working I'm guessing that the resonator is busted. I can't find any mainland europe e-shop that sells this 8Mhz ceramic resonators with 3pin. So can I replace this one with a two pin, and don't connect the ground pin? just the clock in and clock out?

    Thanks in advanced.
     
    Last edited: Jun 19, 2008
  2. AlexR

    Well-Known Member

    Jan 16, 2008
    735
    54
    As your diagram shows a 3 pin resonator has in-built capacitors on the input and output. 2 pin resonators don't have any in-built capacitors so you will have to provide them yourself. The usually value is about 22pF between input and earth and the same between output and earth.
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Microchip has a tutorial about oscillators.
    The connection of x-tals and resonators is descibed on pages 18 and 19.

    Greetings,
    Bertus
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Are you guessing the resonator is bad because of having checked the resonator output? Or are you just "guessing" guessing?
     
  5. vventura

    Thread Starter Member

    Jan 21, 2008
    10
    0
    I have not tested the resonator because I don't have the equipment to do it. The debug led's of the system are OK, so the chances are that either the PIC is busted or the resonator is and is not providing the clock to the PIC. So I'm starting by the resonator.
     
Loading...