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PCM6240-Q1: Microphone status detection issue

Part Number: PCM6240-Q1

Hi

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!