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SLM770A
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SLM770A
Module Hardware Design Manual
MeiG Smart T
echnology Co., Ltd
77
/77
7.3
T
op V
iew of the Module
Figure
29
T
op vie
w of the module
7.4
Bottom V
iew of the Module
Figure
30
Bottom view
of the module
67
69
Table of Contents
Main Page
Important Notice
2
Revision History
3
Table of Contents
4
Contents
4
Introduction
8
Safety Information
9
Purpose
10
Content List
10
Product Overview
11
Basic Description
11
Main Performance
13
Application Interface
16
Basic Description
16
LCC Card Interface Definition
17
Pin Description
17
Module Operating Mode
24
Power Saving
26
Sleep Mode
26
Flight Mode
26
Power Supply Design
27
Power Supply Pins
27
Decrease Voltage Drop
27
Reference Design for Power Supply
30
VDD_EXT Voltage Output
30
Turn on and off
31
Turn on Module Using the PWRKEY
31
Turn off
32
Reset the Module
34
Hardware Reset
34
AT Command Reset
35
USIM/SIM Interface
36
3.10 USB Interface
37
USB Pin Description
38
USB Reference Circuit
38
USB Driver
39
3.11 Serial Port
40
PCM (SLM770A-SC Does Not Support this Function)
41
3.13 Network Status Indication
43
3.14 Status
44
3.15 USB_BOOT Interface
45
3.16 Analog Audio Interface
46
Gnss
49
Basic Description
49
GNSS Performance
49
Layout Guide
49
Antenna Interface
51
Introduction to Antenna Interfaces
51
RF Reference Circuit
52
Antenna
53
Antenna Requirements
53
RF Output Power
54
RF Receiving Sensitivity
56
Working Frequency
57
Antenna Requirements
59
Electrical Characteristics
61
Limiting Voltage Range
61
Environment Temperature Range
61
Electrical Characteristics of Interface in Working Status
62
Environmental Reliability Requirements
63
ESD Features
64
Power Consumption
64
Mechanical Characteristics
66
Mechanical Dimensions of the Module
66
Recommended Packaging
67
Top View of the Module
68
Bottom View of the Module
68
Module Effect Design
69
Storage and Production
70
Storage
70
Production Welding
71
Packaging
71
Annex a Reference Documents and Abbreviations
72
Reference Documents
72
Abbreviations
72
10 Annex B GPRS Coding Scheme
76
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