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TMS320F28027使用复位问题

Other Parts Discussed in Thread: TMS320F28027

使用TMS320F28027芯片设计无刷电机驱动器:第一个版本PCB使用正常,在第一个版本PCB基础上更改了PCB的形状和布线形成第二个版本的PCB,而第二个版本的PCB测试中出现复位情况,测试3.3V电源波形比较干净,请问可能是什么导致的?