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MeiG Smart product technical information
SLM500 Hardware Design Guide Page 45
4.8.2 Microphone receiving Circuit
The figure below shows the interface circuit of MEMS microphone.
Figure 4.22： Microphone Differential Interface Circuit
4.8.3.Headphone Interface Circuit
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 4.24 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 HPH_L has a pull-down resistor