Accdet检测pin内部比较器电压范围说明

[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 key
UP: up key
DW:down key