SIM5218E Hardware Design
Figure 14 :
settings of serial ports
3.8 Audio interfaces
The module provides three analogy audio output channels and two analogy audio input channels.
MIC_P/N and HP_MICP, are used for microphone (two analogy audio input channels), EAR_P/N,
HPR/HPR and SPK_P/N are used for audio output (three analogy audio output channels). There
are some AT Commands to control audio channel switch and other parameters, please refer to ATC
manual.
Note: Please reference document [21] for detailed information of Audio Application Note.
Table 9:
Audio interface signal
Audio channel
SIM5218E_ Hardware Design_V1.06
2012.09.21
29
It is suggested that user adopt one of two following reference circuits in order to get well speaker
Pin name
Pin No
Function
MIC_P
43
MIC anode input
MIC_N
44
MIC cathode input
EAR_P
25
Receiver output anode
NORMAL
( default )
EAR_N
26
Receiver output cathode
HP_MICP
42
Headset MIC anode input
HPR
27
Headset right speaker
HEADSET
HPL
28
Headset left speaker
MIC_P
43
MIC anode input
MIC_N
44
MIC cathode input
SPK_P
23
Loudspeaker anode
Hand free
SPK_N
24
Loudspeaker cathode
