MG3732 module
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The module supports 2.85V/1.8V UIM card, and it’s strongly recommended to add ESD component to protect
UIM card as shown in figure 4-2.
Figure 4-2 UIM Card Circuit Reference Design Diagram
Note: The clock data rate of UIM card circuit is 4M, and the card socket should be laid closely around the
module and the wiring should be as short and thick as possible.
4.5
Audio Interface
The module provides 2 speaker interfaces and 2 microphone interfaces. Only one pair I/O works at the same
time. See the audio interface circuit in figure 4-3.
Figure 4-3 Audio Interface Circuit Reference Design Diagram
Microphone
The two microphone interfaces MIC_N and MIC_P are differential interface, which could also be used for
single end input. It’s recommended to use differential mode to reduce the noises and it is directly connected with
