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您好,HD3SS3202或3220只是一款USB的多路选择器。
您说的”该ic做DFP时会把cc1/cc2都上拉,做UFP时,把cc1和cc2都下拉“ 应该指的TUSB321既可以作为DFP也可以做UFP。
https://www.ti.com/lit/ds/symlink/tusb321.pdf
参考下典型应用,可以看到HD3SS3202只是一款USB的开关器件。
你好,3220不仅是开关,它通过cc管脚可以做其它的事情,包括cable orientation
。做DFP时,cc1/cc2都上拉,发现哪个管脚有下拉,就相应把dir管脚切换电平,这个dir从2路ss usb中做选择。
我好奇的是,照3220的描述,做ufp时,2路都下拉,那对端dfp怎么判断cable orientation?