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TUSB2046B做HUB时,PWRON信号始终输出高电平,求助!

Other Parts Discussed in Thread: TUSB2046B, TPS2042

如题,TUSB2046B配置为自供电独立通道模式。

腿脚配置如下:

EXTMEM:上拉    GANGED:下拉      TSTMODE:下拉   TSTPLL:下拉  BUSPWR:下拉   EECLK:悬空     OC1-4:上拉    SUSPND:接单片机IO

晶振正常,复位正常

上电后PWRON全部高电平,TPS2042没有输出,USB设备没有供电,不能工作,请问哪里出了问题。谢谢大神指点,在线等!