I' m designing a microcontroller board based on Kinetis KL25 uC. As a starting point, I have read all the documentations concerning FRDM-KL25 board. My question is about the main Crystal Oscillator: I don't want to use the one used on the FRDM-KL25 board, because I think is too difficult to mount (particularly on the first prototype boards, that will be produced soldering components by hand). I have some difficulties to understand the recommendations done on the datasheet of the micro, so I want to ask you if I am in the correct way.
Here the specifications of the Crystal Quartz I have chosen for my project and the of the Oscillator mounted on FRDM-BOARD:
QUARZO A - "ABM3B-8000MHZ-B2-T" (USED ON FRDM-KL25)
Frequenza: 8 Mhz
Tolleranza: 20 PPM
Stabilita Frequenza: 50 PPM
Capacitanza di Carico: 18 pF
QUARZO B - "EUROQUARTZ - 8.000MHZ 49USMX/30/50/40/18PF/ATF" (ALTERNATIVE)
Frequenza: 8 Mhz
Tolleranza: 30 PPM
Stabilita: 50 PPM
Capacità di Carico 18 pF
Farnell Code: 1640891
Here my three questions:
A) Can I use the CRYSTAL B to clock the uC?
B) Quartz A has four pins, the two crystal connection pins and two gnd pins. Quartz B only two , the crystal connection ones. Is this a problem? What is the function of the two GND pins on QUART A.
C) For the crystal connection to the KL25 uC, I want to use the same circuit proposed on the KL25 schematic, composed by the two 22pF capacitors and the 1 Mega Ohm Resistor. Are this components still OK also with the new Crystal?
D) If the crystal I have chosen is not suitable to work with the KL25 uC, can you propose me suitable Crystal with the same Frequence and a package easy to solder by hand?
Thanks in advance for your courtesly attention.