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TCA8418: 元器件的使用

Part Number: TCA8418


如何读取按键值,读取按键值的步骤是怎样的?INT和reset应设置为输入还是输出模式,初始化应为高还是低电平?

  • INT和reset应设置为输入还是输出模式,初始化应为高还是低电平?

    INT 是中断输出引脚,open drain输出,所以需要上拉电阻到VCC, 如果发生中断,输出为低电平。

    RESET为复位引脚,也是低有效,TCA8418正常工作时,reset为高电平。 

    读取按键值的步骤可以参考datasheet 8.3.1.3部分的介绍: