[转载] [Headset]Accdet检测pin内部比较器电压范围说明
Platform:MT6575MT6577MT6589MT6572Branch:ICS2JBJB2

FAQ Content[Description]Accdet检测pin内部比较器电压范围说明[A]mt6575/77:有2bit AB比较器作为电压检测
?Plug out state: 1.77V ≤ Voltage ≤1.9V (A=1, B=1);?Mic?Bias state: 0.4V ≤ Voltage<1.77V (A=0, B=1);?Hook Switch state: 0V ≤ Voltage < 0.4V (A=0, B=0).only 1 key?mt6589/72:?Plug out state: 1.77V ≤ Voltage ≤1.9V (A=1, B=1);?Mic?Bias state: 0.5V ≤ Voltage<1.77V (A=0, B=1);?Hook Switch state: 0V ≤ Voltage < 0.5V (A=0, B=0).其中Hook switch multi-key电压分布：0v<=MD<0.09V<=UP<0.24V<=DW<0.5V内部通过adc读取电压值，MD:middle keyUP: up keyDW:down key