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The MIC array interface uses RK809+PDM by default, the DIP switch S1900 is set to ON and S1901 is set to OFF; if
it has to connect the I2S signal of RK3566 to the extension interface, set the DIP switch S1900 to OFF and S1901 to
ON.
Figure 3-18 DIP Switch Selection Circuit of I2S1 Channel
Figure 3-19 Headphone, SPK and MIC Interface
Figure 3-20 Audio MIC Array Interface
The audio MIC array interface signal sequence is as follows:
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