Crystal selection/oscillator considerations

roger_lynx · ‎2007-04-11

Posted on April 11, 2007 at 17:35

roger_lynx · ‎2011-05-17

Posted on May 17, 2011 at 09:31

Hi,

Would you please point me at the part of the STR9 documention which deals with crystal selection for the main internal oscillator?

I can not seem to find any reference to the crystal properties/specs that are required by the STR9's oscillator to work properly.

For example: crystal's cap. load CL, xtal's ESR, or the values for ext. parallel capacitors from MCU's terminals X1_CPU/X2_CPU to ground.

Any help in this area is appreciated in advance.

Thanks.

halim · ‎2011-05-17

Posted on May 17, 2011 at 09:31

Hi,

I suggest to look STR9 getting started hardware.

With best regards,

Punto

roger_lynx · ‎2011-05-17

Posted on May 17, 2011 at 09:31

I missed that. Thank you.

sjackson · ‎2011-05-17

Posted on May 17, 2011 at 09:31

I saw nothing concerning main crystal ESR, load capacitance, etc in the STR9 getting started guide.

roger_lynx · ‎2011-05-17

Posted on May 17, 2011 at 09:31

I saw nothing concerning main crystal ESR, load capacitance, etc in the STR9 getting started guide.

'cause it ain't there, I thanked for the excellent koan.:-]

..but my design works with a crystal having these specs:

f = 12 MHz

C_load = 18 pF

C_shunt = 7 pF

ESR = 100 Ohm

sjackson · ‎2011-05-17

Posted on May 17, 2011 at 09:31

Thanks for your crystal specs. It will serve as a good starting point for me.