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TUSB2077A: 芯片始终为挂起状态

Part Number: TUSB2077A

根据TUSB2077的datasheet设计了hub电路,连接电脑后,显示无法识别该USB设备。经测量发现,芯片的SUSPND引脚在reset信号结束后始终为高电平,并且此时始终也会停掉。 

麻烦帮忙分析下,谢谢

设计电路图

reset信号和3.3V电源波形

reset信号和时钟信号波形

x 出现错误。请重试或与管理员联系。