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TUSB8041-Q1不能被系统识别到

Other Parts Discussed in Thread: TUSB8041-Q1, TUSB8041

系统中用了CPU和几个USB设备(4G模块等),这些设备通过TUSB8041-Q1连接在一起,UP端接CPU,DOWN端接4G模块等。

但CPU系统(UBUNTU)启动后,没有检测到TUSB8041-Q1.

3.3V电压和1.1V电压正常,24M时间用的是振荡器,时钟正常。

USB_VBUS端接一是5V串接91K与10K分压,USB_R1接的是9.53K电阻。

TEST引脚悬空,附件是原理图。

不知道是哪里出了问题?

TUSB8041-Q1.pdf