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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1325070/ts3usb221a-q1-could-i-use-3-3v-gpio-as-input-cotrol-pin
尊敬的 TI
如果电源电压(VCC)为3.3V，是否可以将3.3V GPIO 用作控制引脚'S'？
在数据表中、Vctrl 引脚= VCC 或 GND
谢谢
当 VCC = 3.3V 时、3.3V 是有效逻辑电平。
亲爱的克莱门斯
当 Vcc=3.3V 时、1.8V 也有效吗？ (0.46 x VCC)
勉强算是吧。 检查电源在最坏情况下的容差。
