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6308A–DRMSD–10-May-07

ATSAM2195

10. Recommended Board Layout

Like all HCMOS high integration ICs, following simple rules of board layout is mandatory for reli-

able operations:

• GND, VD33, VD18, VA33, VA18 distribution and decoupling

All GND, VD33, VD18, VA33, VA18 pins should be connected. A GND plane is strongly recom-

mended below the ATSAM2195. The board GND, VD33, VD18 distribution should be in grid

form. Recommended decoupling is 0.1 µF at each VD33, VD18, VA33, VA18 pin of the IC with

an additional 1µF-T between pins 30 and 31. Decoupling capacitors should be implemented

close to the IC.

• Crystal

The paths between the crystal and the ATSAM2195 should be short and shielded. The ground

return from the crystal compensation capacitors should be pin 31.

• Analog section

A specific AGND ground plane should be provided, which connects by a single trace to the GND

ground. No digital signals should cross the AGND plane.