1.Print board layer selection rules, that is, the clock frequency is 5MHZ or pulse rise time is less than 5ns, the PCB board should to be made multilayer
, if using double board, one side of the PCB should be used as a complete ground plane.
2.Multilayer board is a better board-level EMC protection design measure, it is recommended preferred.
3.The separated ground wire of signal circuit and the power circuit should be finally grounded in a public ground; the two should not have a common ground wire.be used as a complete ground plane
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