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TXB0108作为按键电平转换失效

Other Parts Discussed in Thread: TXB0108

 请教下,如下电路,BB侧配置为 输入态,按键按下 没反应。实测按键侧虽然5V上拉82k电阻,但是电压只有0.3V左右,拉不高。

请问这个颗芯片 这样用有问题吗?