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EC21-AU
Quectel EC21-AU User Manual
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LTE
Standard
Module
Serie
s
EC21_Series
_Hardw
are_Design
24
/
1
18
2.4.
EVB
To
help
customers
develop
applica
tions
with
EC21
se
ries,
Q
uecte
l
s
upplies
an
evaluat
ion
b
oard
(UMTS
<E
EVB),
USB
t
o
RS-232
convert
er
cable,
earphone,
antenna
and
other
peripherals
to
contro
l
or
test
the
m
odule.
For
m
ore
deta
ils,
s
ee
document
[1].
24
26
Table of Contents
Safety Information
4
About the Document
6
Contents
10
Table of Contents
10
1 Introduction
17
Special Marks
19
2 Product Overview
20
Frequency Bands and Functions
20
Key Features
21
Functional Diagram
24
Evb
25
3 Application Interfaces
26
General Description
26
Pin Assignment
27
Pin Description
28
Operating Modes
38
Power Saving
38
Sleep Mode
38
UART Application Scenario
38
USB Application with USB Remote Wakeup Function
39
USB Application with USB Suspend/Resume and RI Function
40
USB Application Without USB Suspend Function
40
Airplane Mode
41
Power Supply
42
Power Supply Pins
42
Voltage Stability Requirements
42
Reference Design for Power Supply
43
Monitor the Power Supply
44
Power-On/Off Scenarios
44
Turn on with PWRKEY
44
Turn off Module
46
Turn off with PWRKEY
47
Turn off with at Command
47
Reset
47
U)SIM Interface
49
USB Interface
52
UART Interfaces
53
PCM and I2C Interfaces
55
SD Card Interface
58
Interfaces for WLAN & Bluetooth Applications
59
WLAN Application Interface
62
Bluetooth Application Interface
62
ADC Interfaces
62
SGMII Interface
63
Network Status Indication
65
Status
67
USB_BOOT Interface
68
4 RF Specifications
70
Cellular Network
70
Antenna Interfaces & Frequency Bands
70
Operating Frequency
70
Tx Power
72
Rx Sensitivity
72
Reference Design
78
Gnss
79
Antenna Interface and Frequency Bands
79
GNSS Performance
80
Reference Design
81
Layout Guidelines
81
RF Routing Guidelines
81
Antenna Design Requirements
84
RF Connector Recommendation
84
5 Electrical Characteristic and Reliability
87
Absolute Maximum Ratings
87
Power Supply Ratings
88
Operating and Storage Temperatures
88
Power Consumption
89
Esd
105
Thermal Dissipation
105
6 Mechanical Information
108
Mechanical Dimensions
108
Recommended Footprint
110
Top and Bottom Views
111
7 Storage, Manufacturing and Packaging
112
Storage Conditions
112
Manufacturing and Soldering
113
Packaging Specifications
114
Carrier Tape
114
Plastic Reel
115
Packaging Process
116
4
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Quectel EC21-AU Specifications
General
Brand
Quectel
Model
EC21-AU
Category
Control Unit
Language
English
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