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AN1902 - APPLICATION NOTE

4.3. PCB DEFINITION

In figures 21 and 22 the proposed PCB for both SMD and trough hole demoboards are shown.

Figure 21: SMD PCB Bottom view (not in scale)

Figure 22: Through hole PCB Bottom view (not in scale)

The components placement on the PCB is important and few simple rules have to be followed for its

realization.

1) Frequency capacitor placement:

These components must be connected as close as possible to the CAP1 pin.

2) Ground path:

The ground paths (signal and power) must be separate in order to reduce interference on the logic part.

In figure 23 an example of this rule is shown.