当使能端的电压为低电平时，芯片处于关断状态，静态电流及静态功耗很小。通过对使能端的控制可方便地实现芯片的遥控、定时、开关控制等功能。
When the EN pin is low voltage , the chip operates in shutdown mode and its static current and power dissipation is low , so it is easy to realize remote and timing control .
使能端