原理图见下图,现在SOC启动后给USB 5V供电,但是SOC不能识别芯片,现在怀疑芯片没有正常启动,有以下表现:
1.FULLPWRMGMTz/SMBA1/SS_UP配置为0,启动电源管理,PWRCTL_POL配置为高,但是PWRCTL*一直输出低电平
2.晶振激励电压在上电时是有的,并且在上电1.5ms后能正常起振,但是起振90ms之后激励电压消失
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