Quectel M20 Hardware Design

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 electret microphone input characteristic
Parameter Min Typ Max Unit
Working Voltage 1.2 1.5 2.0 V
Working Current 200 500 A
External
Microphone
Load Resistance
2.2 k
M20_HD_V1.01 - 53 -
Quectel

Quectel M20 Specifications

General

Brand	Quectel
Model	M20
Category	GSM/GPRS Modules
Language	English