This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PCM6240-Q1: 诊断问题

Part Number: PCM6240-Q1


About PCM6240-Q1, we have a detection issue:

Now we set the register 0x75 bit7 micbias_pdz: 0d = Power down MICBIAS and use outside LDO for MIC bias(8.5V), we found that PCM6240-Q1 can't detect the input open circuit.

The input open circuit detection condition needs to meet below:

Whether does internal MICBIAS must be used for input open circuit detection?

Best Regards!

  • 您好,

    应该是的,输入pins INxx至MICBIAS的短路检测应该是按照datasheet如下截图)进行的,即MICBIAS管脚电压与INxx管脚电压差与阈值电压比较。

    如果您使用外部LDO 偏置MIC,那么MIC开路时INXP应该是等于外部偏置MIC的LDO电压,而MICBIAS因为通过寄存器Power down了,其电压为0 ,所以尽管MIC是开路的,MICBIAS-INXP的差值也是大于阈值的,也就检测不到MIC开路了

  • 您好,