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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1305903/tca9539-partial-power-down-backflow-protection
当器件断电时、TCA9539的16个 IO 端口是否为高阻抗？
TI_USER、
未上电时器件在 IO 引脚上被视为高阻态。
此致、
泰勒
