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Quectel
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BC68
Quectel BC68 Hardware Design
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GSM/GPRS
Module
Series
M66
Hardware
Design
M66_Hard
w
are_Desig
n
Confidential /
Release
d
75
/
80
DTX
Discontinuous
Transmission
EFR
Enhanced Fu
ll Rate
EGSM
Enhanced G
S
M
EMC
Electromag
netic Com
patibility
ESD
Electrostatic
Discharge
ETS
European
Teleco
mmunica
tion Standard
FCC
Federal
Communicati
ons Commission
(U.S.)
FDMA
Frequency
Division Mu
ltiple Access
FR
Full Rate
GMSK
Gaussian M
inimum Shift Keying
GPRS
General Pa
cket Radio Serv
ice
GSM
Global Syst
em for M
obile Co
mmunications
G.
W
Gross
W
eight
HR
Half Rate
I/O
Input/Output
IC
Integrated C
ircuit
IMEI
International M
obile
E
quipment
Identity
I
O
max
Maximum Out
put Load Current
kbps
Kilo Bits P
er Second
LED
Light Emittin
g Diode
Li
-Ion
Lithium-Ion
MO
Mobile Origin
ated
MOQ
Minimum Or
der Quantity
MP
Manufactur
e Product
MS
Mobile Stat
i
on (GSM
engine)
Quectel
Confidential
75
77
Table of Contents
About the Document
3
Contents
4
Table of Contents
4
1 Introduction
10
Safety Information
11
2 Product Concept
12
General Description
12
Key Features
13
Functional Diagram
15
Evaluation Board
15
3 Application Interface
16
Pin of Module
17
Pin Assignment
17
Pin Description
18
Operating Modes
22
Power Supply
23
Power Features of Module
23
Decrease Supply Voltage Drop
24
Reference Design for Power Supply
24
Monitor Power Supply
25
Power on and down Scenarios
25
Power on
25
Power down
27
Power down Module Using the PWRKEY Pin
27
Power down Module Using at Command
28
Under-Voltage Automatic Shutdown
29
Restart
29
Power Saving
30
Minimum Functionality Mode
30
SLEEP Mode
30
Wake up Module from SLEEP Mode
31
Summary of State Transition
31
RTC Backup
31
Serial Interfaces
33
UART Port
35
The Feature of UART Port
35
The Connection of UART
36
Firmware Upgrade
37
Debug Port
38
Auxiliary UART Port
39
UART Application
39
Audio Interfaces
41
Decrease TDD Noise and Other Noise
42
Microphone Interfaces Design
42
Receiver and Speaker Interface Design
43
Earphone Interface Design
45
Audio Characteristics
45
PCM Interface
46
Configuration
46
Timing
47
Reference Design
49
AT Command
49
SIM Card Interface
50
Adc
52
Behaviors of the RI
52
Network Status Indication
54
RF Transmitting Signal Indication
55
4 Antenna Interface
57
GSM Antenna Interface
57
Reference Design
57
RF Output Power
58
RF Receiving Sensitivity
59
Operating Frequencies
59
RF Cable Soldering
60
Bluetooth Antenna Interface
60
5 Electrical, Reliability and Radio Characteristics
62
Absolute Maximum Ratings
62
Operating Temperature
62
Power Supply Ratings
63
Current Consumption
64
Electro-Static Discharge
66
6 Mechanical Dimensions
67
Mechanical Dimensions of Module
67
Recommended Footprint
69
Top View of the Module
70
Bottom View of the Module
70
7 Storage and Manufacturing
71
Storage
71
Soldering
72
Packaging
72
Tape and Reel Packaging
73
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Quectel BC68 Specifications
General
Brand
Quectel
Model
BC68
Category
Control Unit
Language
English
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