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您好,我看您将复位引脚GRSTz直接接GND了,如果直接接地,上电时序要求如下: VDD33先上电,然后VDD上电,等VDD33和VDD上电稳定之后至少需要等td2=3ms才能将GRSTz拉高。 建议您用示波器验证下这个上电时序,是否满足Figure1的要求。