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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/999578/tca9546a-downstream-scx-sdx-default-reset-state
上电复位或下游通道禁用时、SCX/SDX 引脚的状态是什么？ 可以安全地进入高阻抗状态？
Neal、您好！
是的、加电后(或者如果复位引脚被切换)、那么次级 I2C 线路(SDX/SCX)应该为高阻态 (假设 Vcc 的功率斜坡符合数据表第10节中指定的建议值。)
此外、如果 Vcc 不存在(GND)并且次级通道/主通道通过上拉电阻器供电、则器件仍应为高阻态
-Bobby
