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SC20
Quectel SC20 User Manual
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L
TE
Module
Series
Smart
EVB
User
Guide
Smart_EVB_
User_Guid
e
Confidential
/ Released
17
/
29
The follow
ing figure sh
ows t
he sketch of aud
io jack which
matches the
Smart EVB.
2
1
MIC
GND
SW
SPK_R
SPK_L
3
4
32
Ω
32
Ω
Figure
10
: The Sketc
h of A
udio
Jack
3.3.3.
MIC and Speaker
SMT
U701
MIC
is
used
for
microphone
and
speaker
is
soldered
on
TP703
and
TP704.
The
f
ollowin
g
figure shows t
he sche
matic of the MIC a
nd S
peaker
.
ESD
33pF
ESD
ESD
ESD
33pF
33pF
33pF
1
00
pF
100
pF
MIC1_P
MIC1_N
EAR_P
EAR_N
FB
EVB
M
IC_BIAS
H
P
H
_
R
H
P
H
_
L
U
701
MIC
TP
703
TP
704
REC
Figure
11
:
MIC a
nd Spea
ker Circuit
4
DETECT
Earphone det
ection
5
L-AUDIO
Earphone le
ft channe
l
6
GND
Dedicated G
ND for audio
Quectel
Confidential
17
19
Table of Contents
About the Document
3
Table of Contents
4
Contents
4
Introduction
7
Safety Information
8
General Overview
9
Key Features
9
Interface Overview
10
EVB View
12
EVB Accessories
12
Figure 3: Evb Accessories
13
Interface Application
14
Power Interface
14
USB Device Interface
15
Audio Interface
16
Loud Speaker
16
Earphone
17
MIC and Speaker
18
USIM Card Interfaces
19
UART Interfaces
20
Switches and Buttons
21
Table 8: Description of Switches and Buttons
22
Status Leds
23
Test Points
24
Operation Procedure
26
Power on
26
Power off
26
Reset
27
Communication Via USB or UART Interface
27
Communication Via USB Interface
27
Communication Via UART Interface
27
Firmware Upgrade
28
EVB Accessories Assembly
29
Smart_Evb_User_Guide
29
Appendix A Reference
30
Confidential / Released
30
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Quectel SC20 Specifications
General
Brand
Quectel
Model
SC20
Category
Control Unit
Language
English
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