2 伪差分（无电容器）输出配置的示例

AVDD = 3.3V/3.0V
Mic_bias = 2.75V/2.5V
Ref = HPRCOM = 1.65V/1.5V

• 插入前，设置 Bias = AVDD – HPCOM = 3.3V – 1.65V = 1.65V
  $Insertion detected: Mic\_detect<Bias *\frac{22}{25}+Ref=1.65*\frac{22}{25}+1.65=3.102$
  $No Insertion : Mic\_detect>Bias *\frac{22}{25}+Ref=1.65*\frac{22}{25}+1.65=3.102$
• 耳机类型检测，设置 Bias = Mic_bias – HPCOM = 2.75 – 1.65 = 1.1V
  $Headset with MIC: Mic\_detect>Bias *\frac{11}{100}+Ref=1.1*\frac{11}{100}+1.65=1.771$
  $Headset without MIC: Mic\_detect<Bias *\frac{11}{100}+Ref=1.1*\frac{11}{100}+1.65=1.771$

• 钩子按钮按下检测，设置 Bias = Mic_bias – HPCOM = 2.75 – 1.65 = 1.1V。
  仅当检测到带麦克风的耳机时，按钮按下检测才会激活。
  $No botton push: Mic\_detect>Bias *\frac{11}{100}+Ref=1.1*\frac{11}{100}+1.65=1.771$
  $Push botton detected : Mic\_detect<Bias *\frac{11}{100}+Ref=1.1*\frac{11}{100}+1.65=1.771$

• 耳机拔出检测，设置 Bias = Mic_bias – HPCOM = 2.75 – 1.65 = 1.1V
  $Headset removed : Mic\_detect>Bias *\frac{22}{25}+Ref=1.1*\frac{22}{25}+1.65=2.618$
  $Headset removed : Mic\_detect<Bias *\frac{22}{25}+Ref=1.1*\frac{22}{25}+1.65=2.618$