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AaronChuzb avatar AaronChuzb commented on August 26, 2024

其实我也看不太懂这里的电路设计,对mos管应用不太多,PWR_EN给高电平时,Q2 nmos会被导通,此时的Q1的G极为低电平,从而被短路。

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peng-zhihui avatar peng-zhihui commented on August 26, 2024

Q1不是做电源切换的,是用来控制电池供电的开关,当开机键按下之后导通反之关断,而开机之后的一秒内由软件控制PWR_EN的IO拉高进行保持,松开按键之后就不会断电了。

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yuzhou3996 avatar yuzhou3996 commented on August 26, 2024

我理解稚晖君的意思了。不知道这样理解对不对?
开关连接到EC_KEY引脚,当没有按下开关的时候,Q1的G极被上拉,此时Q1不导通,不进行供电。
开关按下的时候,EC_KEY引脚拉低,此时Q1的G极被拉低为二极管的压降大约0.3V,Q1导通,芯片上电
芯片上电以后,将PWR_EN拉高,此时Q2导通,Q1的G极一直被拉低,所以开关再次松开也不会断电了
但是还有个问题想请教一下,EC_KEY_DET的作用是什么呢?还希望稚晖君能帮忙解答?

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peng-zhihui avatar peng-zhihui commented on August 26, 2024

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yuzhou3996 avatar yuzhou3996 commented on August 26, 2024

好的,多谢解答

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