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【转】MTK 平台开机流程应用指南

1、开机方式及硬件实现方法

1.1 正常开关机

手机开机硬件电路图

正常开机过程

       开机过程：按下power key 后，二极管导通，PWRKEY 检测到低电平,驱动PMIC 打开LDOs，之后PMIC 使BB 复位，随之BB 起来进入软件开机程序，完成开机，按power key 关机时，首先执行软件关机程序，随后复位及LDOs 也被关闭，完成关机。

1.2 充电开机

        开机过程：当插充电器给手机充电时，CHRIN 检测到高电平，驱动PMIC 打开LDOs，如果此时电池的电压>3.2V,PMIC 产生EINT 中断(高电平)，（如果此时电池的电压<3.2v，先小电流充电使电池电压>3.2v）PMIC 使BB 复位，BB 起来执行软件开机程序，完成充电开机。

1.3 闹钟开机

      开机过程：闹钟醒来时，BBwakeup 先起来由低电平变高电平,然后PMIC 的所有LDO 后起来，过200ms 后PMIC 使BB 复位，执行软件开机程序，当按下左键停止闹钟，完成开机。其关机过程同正常关机一样。

1.4 开机debug 流程图：

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