Audio Interfaces - SimCom SIM548C HD V1.01 Hardware Design

SIM548C Hardware Design
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Note For detail information about serial port application, please refer to document [12]

3.10 Audio interfaces

Table 15: Pin definition of the Audio interface
Name
MIC1P
(AIN1/AOUT1)
MIC1N
SPK1P
SPK1N
(AIN2/AOUT2) MIC2P
MIC2N
SPK2P
SPK2N
The module provides two analogy input channels, AIN1 and AIN2, which may be used for both
microphone and line inputs. The electret microphone is recommended when the interface is used
SIM548C_HD_V1.01
Figure 20: RS232 level converter circuit
Pin Function
42 Microphone1 input +
44 Microphone1 input -
41 Audio1 output+
43 Audio1 output-
46 Microphone2 input +
48 Microphone2 input -
45 Audio2 output+
47 Audio2 output-
49
09.05.2008