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SimCom SIM808 User Manual
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2.3
SIM808 Functional Diagram
The following figure
shows a functional
diagram of SIM808:
z
The GSM baseband en
gine
z
The GPS engine
z
Flash
z
The GSM radio frequency part
z
The antenna interface
z
The other interfaces
Figure 1: SIM808 functional dia
gram
SIM808_Hardware Design_V1.
00
2014.03.27
14
13
15
Table of Contents
Contents
3
Table of Contents
3
Version History
9
1 Introduction
10
2 SIM808 Overview
10
SIM808 Key Features
10
Table 2: Gps Engine Performance
12
Operating Modes
13
SIM808 Functional Diagram
14
3 Package Information
15
Pin out Diagram
15
Pin Description
16
Package Dimensions
18
Figure 4: Recommended Pcb Footprint Outline（Unit: MM
19
4 GSM Application Interface
20
Power Supply
20
Power Supply Pin
21
Monitoring Power Supply
22
Power On/Down SIM808
22
Power on SIM808
22
Figure 12: Timing of Power on Module
23
Power down SIM808
24
Reset Function
25
Power Saving Mode
26
Function Mode
27
Sleep Mode (AT+CSCLK=1)
27
Wake up SIM808 from Sleep Mode (AT+CSCLK=1)
27
Charging Interface
28
Battery Pack Characteristics
28
Recommended Battery Pack
28
Implemented Charging Technique
29
Operating Modes During Charging
29
Charger Requirements
30
RTC Backup
30
Serial Port and USB Interface
31
Function of Serial Port
32
Serial Port
32
Figure 23: Level Converting by Resistor
33
USB Interface
34
Software Upgrade and Debug
35
RI Behaviors
35
Audio Interfaces
36
Speaker Interface Configuration
37
Microphone Interfaces Configuration
37
Audio Electronic Characteristics
38
Tdd
38
Bluetooth
39
Antenna Interface
39
SIM Card Interface
39
SIM Card Application
40
SIM Card Design Consideration
41
Design Considerations for SIM Card Holder
41
Table 18: Pin Description (Molex Sim Card Holder)
42
PCM Interface
43
PCM Multiplex Function
43
PCM Interface
44
LCD Display/Spi Interface
44
SD Card Interface
45
Keypad Interface
45
Figure 44: Extended Keypad Reference Circuit
46
I2C Bus
47
General Purpose Input/Output (GPIO)
48
Adc
48
Pwm
49
Table 29: Adc Specification
49
Network Status Indication
50
Operating Status Indication
50
RF Synchronization Signal
51
Antenna Interface
51
5 GPS Application Interface
52
GPS Operating Modes
52
GPS Power On/Down Scenarios
53
Power on GPS Engine
53
Power down GPS Engine
53
GPS Antenna Interface
53
GPS Antenna Choice Consideration
53
6 Electrical, Reliability and Radio Characteristics
54
Absolute Maximum Ratings
54
Recommended Operating Conditions
55
Digital Interface Characteristics
55
SIM Card Interface Characteristics
55
SIM_VDD Characteristics
56
VDD_EXT Characteristics
56
VRTC Characteristics
56
Current Consumption (VBAT = 4V, GPS Engine Is Powered Down)
56
Electro-Static Discharge
57
Radio Characteristics
58
Module RF Output Power
58
Module RF Receive Sensitivity
59
Module Operating Frequencies
60
7 Manufacturing
61
Top and Bottom View of SIM808
61
Typical Solder Reflow Profile
61
The Moisture Sensitivity Level
62
Baking Requirements
62
Appendix
63
Terms and Abbreviations
64
Safety Caution
65
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SimCom SIM808 Specifications
General
Brand
SimCom
Model
SIM808
Category
Control Unit
Language
English
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