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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1251999/tca9539-q1-pin-state-when-power-down
您好、TI！
您能帮助确认组0&1的端口状态吗？ 还是高阻抗？
Br
Junsong
第6.3节的脚注(1)表示该引脚具有高阻抗、但存在明显的漏电流。 未指定金额。
Junsong、
当器件未通电时、TCA9539被视为"高阻抗"。
-鲍比
