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NuMaker-emWin-RDK-N9H20
Mar. 26, 2021 Page 10 of 25 Rev 1.11
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2 PCB LAYOUT DESIGN NOTE.
NuMaker-emWin-RDK-N9H20 demo board is a 2-layers PCB and single component side design, for
getting good performance and system quality have some suggestions as the below please follow.
USB
USB differential Line have 3 conditions as far as possible: 1, equal length; 2, equal width and 3,
Equidistant
To do 90ohm ±10% impedance control. The double-layer plate can be controlled by the way of the
impedance, that is, the differential line to do the GND shielding processing.
The NuMaker-emWin-RDK-N9H20demo board USB eys diagram result as the below fugure