Users Manual
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Figure 4.21: Receiver Interface Circuit
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Below is the MEMS microphone interface circuit, which has more BIAS power supply than the electret
MIC.
Figure 4.22: Microphone Differential Interface Circuit
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The module integrates a stereo headphone jack. Users are advised to reserve ESD devices during the
design phase to prevent ESD damage. The HS_DET pin of the module can be set as an interrupt. In
software, this pin is the earphone interrupt by default. The user can use this pin to detect the
plugging and unplugging of the earphone.
Figure 4.23: Headphone Interface Circuit
note:
1. The earphone holder in Figure 4.23 is normally closed. If the user is using the normally open mode earphone
holder, please modify the detection circuit according to the actual pin and modify the software accordingly.
2. We recommend that the headphone detection pin HS_DET and HPH_L form a detection circuit (the connection
method in the above figure), because the HPH_L has a pull-down resistor inside the chip, which can ensure that
HS_DET is low when connected with HPH_L, if the user will HS_DET and HPH_R Connect, please reserve the position
of 1K pull-down resistor on HPH_R.
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