hi
Looking at your artwork file, it looks like there are lines and some parts placed underneath the crystal circuit.
The presence of signal traces running underneath the crystal oscillator of your W5500-based circuit can indeed cause problems. Here’s why and how you can address it:
Electromagnetic Interference (EMI): Powerful signal traces can generate electromagnetic interference that disrupts the normal oscillation of the crystal. This can degrade the precise and stable environment required for the crystal to start oscillating properly.
Noise Induction: Noise from nearby signal traces can be inductively coupled into the crystal pins, especially if those traces are carrying digital switching signals.
Thermal Effects: Traces carrying high currents can generate heat, which may affect the temperature of the crystal. Crystals are sensitive to temperature changes, and this could influence their oscillating frequency.
Parasitic Capacitance Changes: If signal traces are placed too close to parts of the crystal oscillator circuit, it can alter the parasitic capacitance, which affects the characteristics of the crystal’s oscillation.
To mitigate these issues, consider the following steps:
Keep the traces associated with the crystal circuit as short as possible.
Place a ground plane between the crystal and its load capacitors to shield against EMI from the signal traces.
Ensure there is adequate spacing between any signal traces and the crystal.
If possible, create a keep-out area with no signals directly underneath or near the crystal.
Add shielding around the crystal to protect from external noise sources.
W5500-EVB-PICO
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