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Quectel BC68 Hardware Design
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GSM/GPRS
Module
Series
M66
Hardware
Design
M66_Hard
w
are_Desig
n
Confidential /
Release
d
42
/
80
3.8.3.
Rec
eiver and Speake
r Interface Design
SPK1P
SPK1N
Differential layout
Module
10pF
0603
Close to speaker
GND
ESD
33pF
0603
33pF
0603
GND
10pF
0603
ESD
10pF
0603
33pF
0603
Figure
23
:
Handset Inter
face Desig
n for AOUT1
SPK1P
SPK1N
Differential
layout
Amplifier
circuit
Module
10pF
0603
Close to speaker
GND
ESD
33pF
0603
33pF
0603
GND
10pF
0603
ESD
10pF
0603
33pF
0603
Figure
24
:
Spea
ker Interface Desig
n w
ith an A
mplifier for A
OUT
1
Quectel
Confidential
42
44
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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Manual
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Quectel BC68 Specifications
General
Brand
Quectel
Model
BC68
Category
Control Unit
Language
English
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