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SIMCom SIM868 Series
SIM Tech SIMCom SIM868 Series User Manual
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Smart M
achine S
mart Decisio
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SIM8
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V1
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3.3.
Package Dime
nsion
s
Figure
3
:
Dimension
s of
SIM868
(Un
i
t: mm)
SIMCOM
CONFIDENTIAL
FILE
19
21
Table of Contents
Default Chapter
3
Table of Contents
3
1 Introduction
11
2 SIM868 Overview
11
SIM868 Key Features
12
Operating Modes
15
Functional Diagram
16
3 Package Information
17
Pin out Diagram
17
Pin Description
18
Package Dimensions
20
4 Application Modes of SIM868
23
All-In-One Mode
23
Stand-Alone Mode
24
5 Application Interface of GSM
25
Power Supply of GSM
25
Reference Circuit of GSM Power Supply
26
Power On/Off GSM Part
27
Power on GSM
27
Power off GSM
28
Power Saving Mode of GSM
29
Minimum Functionality Mode of GSM Part
29
Serial Port of GSM
30
Function of Serial Port
31
Serial Interfaces
31
Debug Interface
33
Software Upgrade of GSM
34
UART1_RI Behaviors
34
Audio Interfaces
35
Speaker Interfaces Configuration
36
Microphone Interfaces Configuration
37
Audio Electronic Characteristic
37
TDD Noise of GSM
37
SIM Card Interface
38
SIM Card Application
38
SIM Card Design Guide
39
Design Considerations for SIM Card Holder
40
SD Interface
42
I2C Bus
42
Adc
42
Network Status Indication
43
Operating Status Indication
43
RF Synchronization Signal
44
Antenna Interface of GSM
44
Bluetooth Antenna Interface
46
Bluetooth Low Energy (BLE)
46
6 Application Interface of GNSS
48
GNSS Overview
48
Power Supply of GNSS
48
Backup Power of GNSS
48
Power On/Off GNSS
49
Serial Port of GNSS
50
Software Upgrade of GNSS
51
1PPS Output
51
Antenna Interface
52
Passive Antenna
52
Active Antenna
53
Operation Modes of GNSS
53
A-Gps
55
Easy Mode
55
Epo
55
Fast-Fix
55
Multi-Tone AIC
56
Sbas
56
7 PCB Layout
57
Pin Assignment
57
Principle of PCB Layout
58
Antenna Interface
58
Power Supply
58
SIM Card Interface
58
Audio Interface
58
8 Electrical, Reliability and Radio Characteristics
59
Absolute Maximum Ratings
59
Recommended Operating Conditions
59
Digital Interface Characteristics
59
SIM Card Interface Characteristics
60
SIM_VDD Characteristics
60
VDD_EXT Characteristics
60
Current Consumption（Gsm_Vbat=4.0V
60
Electro-Static Discharge
61
Radio Characteristics
62
Module RF Output Power
62
Module RF Receive Sensitivity
63
Module Operating Frequencies
63
9 Manufacturing
64
Top and Bottom View of SIM868
64
Typical Solder Reflow Profile
64
The Moisture Sensitivity Level
65
Baking Requirements
65
10 Packaging
66
11 Appendix
68
Related Documents
68
Terms and Abbreviations
69
Safety Caution
71
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SIM Tech SIMCom SIM868 Series Specifications
General
Brand
SIM Tech
Model
SIMCom SIM868 Series
Category
GSM/GPRS Modules
Language
English
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