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关于EMB1428Q芯片CEXT1,CEXT2无方波输出问题

Other Parts Discussed in Thread: EMB1428Q

我单独使用EMB1428Q芯片,EN信号反向接到DONE,把DIR反向接到DIR/,把三个Fault拉低,供12V,5V,3.3V电压,RESET接地,测试CEXT1,CEXT2无方波输出,请问这个是啥原因