Any unused area of the top and bottom signal layers of the pcb can be filled with copper that is connected to the ground plane through vias Data matrix codes offers high data density in a very small size, making them an ideal solution for marking pcbs where space might be limited. Traces that route over a slot in an image plane results in a possible rf return loop, as shown in figure 9.
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2d codes such as data matrix and qr codes are used in almost all industries to share information about the parts or products on which they are marked.
Usb hardware design guidelines this application note gives recommendations on hardware design for implementing usb host and device applications using usb capable efm32 microcontrollers along with some example schematics for different applications.
