Figure 13. Eliminating floating metal/shape
9.4.3 EMI/EMC and ESD considerations for layout
These considerations are important for all system and board designs. Though the theory behind this is well explained, each board
and system experiences this in its own way. There are many PCB and component related variables involved.
This application note does not go into the electromagnetic theory or explain the whys of different techniques used to combat the
effects, but it considers the effects and solutions most recommended as applied to CMOS circuits. EMI is radio frequency energy
that interferes with the operation of an electronic device. This radio frequency energy can be produced by the device itself or by
NXP Semiconductors
Recommendations
Hardware Design Guidelines for LPC55(S)xx Microcontrollers, Rev. 0, 30 October 2020
Application Note 20 / 24
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