AN2321 Freescale Semiconductor / Motorola, AN2321 Datasheet - Page 28

• Manufacturer Part Number: AN2321
• Description: Designing for Board Level Electromagnetic Compatibility
• Manufacturer: Freescale Semiconductor / Motorola

AN2321/D
PCB Example 1
28
Change 90 ° traces to 45 ° and
the 45 ° trace must be greater
than 10 × the trace width
All traces must be routed far
away from the power line
(L and N)
Add series termination resistors,
and filter capacitor in the two lines
of the power switch
Figure 28
a washing machine.
Designing for Board Level Electromagnetic Compatibility
Freescale Semiconductor, Inc.
Figure 28. PCB Improvement — Example 1
For More Information On This Product,
shows some improvements on a typical printed circuit board used in
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Add 0.01 µ F/0.1 µ F and 470 µ F capacitors at
the input and output of the 7805 regulator
Add 0.01 µ F capacitors and connect the 5V
to the UNL2003
Place all oscillator components
and decoupling capacitors as close
as possible to the MCU
Enlarge all 5V and GND traces (min. 60 mil)
and route as parallel traces
MOTOROLA