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PCA9306: PCA9306的VREF的具体作用

Part Number: PCA9306

PCA9306的内部是有三个MOS管控制的,三个MOS管的栅极统一连接到EN管脚上,给栅极提供一个电压,输入输出信号的高低通过外部电源的上拉完成的,请问这个器件的VREF的具体作用是什么呢?