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手机电池电量检测

Other Parts Discussed in Thread: BQ40Z50

请教一下:

现在的智能手机一般是用什么检测电池电量的,不应该是通过检测电池电压把?

我想基本上应该是通过库伦计,那上面是不是都捆绑着芯片?是通过单线协议传输电量信号?单线协议是HDQ?