M20 Hardware Design
3.10.3 Earphone interface configuration
1
2
4
3
Amphenol
9001-8905-050
SPK2P
MIC2N
MIC2P
68R
33pF
GND
GND
AGND
Close to Socket
Differential layout
33pF
AGND
33pF
10pF
GND
GND
GND
GND
AGND
Module
Figure 31: Earphone interface configuration
Note: The module supports optionally earphone detection and hook off in hardware, In other
words, it is not supported in default hardware configuration. If customer needs earphone
detection or hook off detection, please contact Quectel.
Table 17: Typical e
lectret
microphone input characteristic
Parameter
Min
Typ
Max
Unit
Working
Voltage
1.2 1.5 2.0 V
Working Current 200
500
μ
A
External
Microphone
Load Resistance
2.2
k
Ω
M20_HD_V1.01
- 53 -
Quectel