Headset Interface Reference Design - Quectel SG368Z Series Hardware Design

VCCIO1
MIC1_P
GND
Module
Figure 14: Reference Design of Single-ended Microphone Interface

4.8.2. Headset Interface Reference Design

VCCIO1
ADC2
MIC_M
HPH_R
HPH_L
HPH_GND
GPIO
VCCIOx
GND
Module
NOTE
1. ADC2 can be used for headset HOOK function, which is under development.
2. GPIO is used for headset insert detection function. VCCIOx indicates the reference voltage of GPIO.
If it is required to support headset insert detection function in a low power consumption state, the
GPIO of PMUIO power domain should be selected.
3. HPH_GND needs to be routed separately to the headset socket and connected to GND to reduce the
SG368Z_Series_Hardware_Design
R1
100R
100R
R1
C1 R2 R3
100 nF
100K
100K
R7
R8
100K
C3
100 nF
Figure 15: Reference Design of Headset Interface
R2
2.2K
C2 C1
1 μF
200 pF
1 μF
C2
R4
2.2K
R5
R6
1 K
C4 C5
R9
0R
NM NM
Smart Module Series
ECM MIC
D1
4
MIC
2
R_AUDIO
0R
3
L_AUDIO
0R 1
GND
5
6
D1 D2 D3 D4
TVS
Array
1
MIC_P
2
MIC_M
DETECT
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