Following Crystal Guidelines? 2-layer DIY Teensy LC (MKL26Z64VFT4) project

mikemontauk

Active member
Hello, I have reviewed the posted crystal guidelines and I believe this layout adheres to the PJRC recommendations. Would anyone offer criticism before I send the board to the fab house? Thanks!

crystal ground.PNG

Notes: Crystal is 344-NX3225SA16MHZB3; this is a 2-layer DIY Teensy LC (MKL26Z64VFT4) project

"The crystal should be located close to the MK20 chip. A ground plane should be placed underneath the crystal. If using a 2 layer PCB design, the ground plane for the crystal should NOT make any other connections to ground, other than the crystal case ground, capacitor grounds (if adding extra capacitance) and to the ground pin next to the crystal pins."
 
Lower the inductance between the crystal ground pin and the plane? You've squeezed it into a thin trace for no reason,
let it widen as soon as possible by repositioning the top crystal trace lower down?

Don't overlap it so much with the botton ground plane either - that's going to couple noise in. It can be the same size as the
cutouts in the botton plane.
 
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