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求助,UCD9081检测不到

Other Parts Discussed in Thread: UCD9081, UCD9080

第一次使用UCD9081做设计,用来控制FPGA的上电时序,前期做了一测试板卡,用来验证此芯片的功能,但是插上USB interface adapter后,GUI界面右下角提示“UCD9081 not present”。这个设计是参考的TI官方的设计,在电压检测轨道MON那做了些改动。以下为检测结果和原理图,请大家帮忙分析分析哪有可能出问题了(原理图中原先采用UCD9080,后替换成UCD9081)

附件中添加了自己设计的原理图。