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直接接VCCA 可以,但是开机的正常时序是上电时,OE拉低使得TXB0108输出高阻态,然后当power 起来稳定之后再将OE拉高,输出使能。 也就是说上电过程,OE是一个由低到高的变化过程。 可以通过主控的GPIO控制。