Audio Interfaces; Pin Description; Design Guide - SimCom SIM5320AL User Manual

3.4 Audio Interfaces (For SIM5320AL only）
SIM5320 provides two analog signal outputs and one analog input. MIC1P/N is used as microphone,
EAR1P/N and SPK_P/N are used as audio output. Regarding audio parameters configuration, please refer
to the ATC manual.
3.4.1

Pin Description

Table 9: Pin description
Audio channel Pin name
MIC1P
MIC1N
Normal
EAR1P
EAR1N
MIC1P
MIC1N
Hand-free
SPK_P
SPK_N
Table 10: MIC input characteristics
Parameter
Working Voltage
Working Current
External Microphone Load Resistance
Table 11: Audio output characteristics
Parameter
Normal
Differential
(EAR_P,EAR_N)
Table 12: Speaker output characteristics
Parameter
Quiescent Current
Load resistance
Output power(1KHz)
3.4.2

Design Guide

There are three audio channels in SIM5320，including speaker output , receiver output and microphone
SIM5320AL_User Manual_V1.01
Pin No. Function
23 MIC positive input
24 MIC negative input
26 Receiver positive output
25 Receiver negative output
23 MIC positive input
24 MIC negative input
22 Loudspeaker positive output
21 Loudspeaker negative output
Min Typ
- 1.8
0.07 0.4
1.2 2.2
Load resistance
Output power
Min Typ
- 2.5
- 8
- 500
32
Smart Machine Smart Decision
Max
-
1
Min Typ Max
27 32 -
- 50 -
Max Unit
4 mA
- Ohm
- mW
Unit
V
mA
k Ohms
Unit
Ohm
mW
2014-08-20