Power and Ground

• Dedicate the layer immediately below the layer containing the RF traces from the ATWINC15x0B for the ground. Ensure that this ground plane does not get broken up by routes.
• Power traces can be routed on all layers except the ground layer.
• Power supply routes must be heavy copper fill planes to ensure low inductance.
• The power pins of the ATWINC15x0B must have a via directly to the power plane, close to the power pin.
• Decoupling capacitors must have a via next to the capacitor pin and this via must be directly connected to the power plane and avoid a long trace for this connection.
• The ground pad of the decoupling capacitor must have a via directly connected to the ground plane.
• Each decoupling capacitor must have its own via directly connected to the ground plane and directly connected to the power plane next to the pad.
• The decoupling capacitors must be placed as close as possible to the pin that it is filtering.