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CC2640封装5*5的总是调试不出来

Other Parts Discussed in Thread: CC2640

 CC2640封装5*5的一直调试不出来,多次REST后,偶尔能起来一下,立马又掉线,这是什么原因。
我测量了一下波形,比较多尖锋杂波,波形幅度也小,0.2V都不到。
我们之前有做两款7*7都调试OK了,但是我测试波形,也发现比较多杂波。
我看很多人把晶振匹配电容NC了,这是什么原因。