ADM3491使能

ADM3491在进行RS422通讯时,接收和发送使能应该如何处理,数据手册的真值表里没给出来啊

  • TABLE 7管脚定义中给出了使用方法。就是看/RE和DE管脚的电平。

    RE Receiver Output Enable. A low level enables the receiver output, RO. A high level places it in a high impedance state. If RE is high and DE is low, the device enters a low power shutdown mode.

    DE Driver Output Enable. A high level enables the driver differential Output A and Output B. A low level places it in a high impedance state. If RE is high and DE is low, the device enters a low power shutdown mode.

    可以将RE和DE管脚连接到MCU的GPIO引脚,通过控制拉高拉低来使能接收和发送。