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UC20
Quectel UC20 User Manual
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UMTS/H
SPA
Module
Series
UC20
Hardware
Design
UC20_Hardwar
e_Desi
gn
Confidential / Releas
ed
37
/
84
Use th
e
RESET_N
on
ly w
hen turning
o
ff th
e
module
by
the
command
A
T+QPOWD
and t
he
P
WRKEY pi
n
failed.
3.9.
RTC Backup
The
RTC
(
Real
Time
Clock) can
be
powere
d
by
an external
power so
urce
through
the pin
VRTC whe
n
the
module
is
powered
down
and
there
is
no
power
supply
for
the
VBAT.
It
is
al
so
available
to
charge
the
battery
on
the
VRTC
when
module
is
turned
on.
You
can
choose
rechargeab
le
battery,
cap
acitor
or
non
-recharge
able battery
depend
ing on dif
ferent applicati
ons.
The follow
ing figures s
how t
he various sa
mple circ
uits for V
RTC backup.
Module
RTC
Core
R
VRTC
Non-chargeable
Battery
Figure
15
: R
TC Sup
ply from Non-c
hargeable
Batt
ery
Rechargeable
Battery
Module
RTC
Core
R
VRTC
Figure
16
: R
TC Sup
ply from Rech
argeable
Battery
NOTE
37
39
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
Directives and Standards
12
FCC Statement
13
FCC Radiation Exposure Statement
13
Key Features
13
Table 2: Uc20 Key Features
14
Functional Diagram
16
Evaluation Board
17
3 Application Interface
18
General Description
18
Pin Assignment
19
Pin Description
20
Operating Modes
26
Power Saving
26
Sleep Mode
26
UART Application
27
USB Application with Suspend Function
27
USB Application Without Suspend Function
28
Airplane Mode
29
Power Supply
30
Power Supply Pins
30
Decrease Voltage Drop
30
Reference Design for Power Supply
31
Monitor the Power Supply
32
Turn on and off Scenarios
32
Turn on Module Using the PWRKEY
32
Figure 9: Turn on the Module Using Keystroke
33
Turn off Module
34
Turn off Module Using the PWRKEY Pin
34
Turn off Module Using at Command
35
Automatic Shutdown
35
Reset the Module
36
Figure 12: Reference Circuit of Reset_N by Using Driving Circuit
37
RTC Backup
38
UART Interface
39
Table 10: Pin Definition of the Debug Uart Interface
40
Figure 18: Reference Circuit with Translator Chip
41
Figure 20: Rs232 Level Match Circuit
42
USIM Card Interface
43
USIM Card Application
43
Figure 23: Reference Circuit of the 6 Pin Usim Card
44
Design Considerations for USIM Connector
45
Table 14: Pin Description of Amphenol Usim Connector
46
USB Interface
47
PCM and I2C Interface
48
Figure 28: Primary Mode Timing
49
Table 16: Pin Definition of Pcm and I2C Interface
50
ADC Function
51
Network Status Indication
52
Operating Status Indication
53
Status
53
Sleep_Ind
54
Behavior of the RI
55
4 GNSS Receiver
56
General Description
56
GNSS Performance
57
Layout Guideline
58
5 Antenna Interface
59
UMTS Antenna Interface
59
Pin Definition
59
Operating Frequency
59
Reference Design
59
GNSS Antenna Interface
60
Reference Design for Passive Antenna
61
Reference Design for Active Antenna
62
Antenna Installation
62
Antenna Requirement
62
Install the Antenna with RF Connector
63
Figure 38: Mechanicals of Uf.l-Lp Connectors
64
6 Electrical, Reliability and Radio Characteristics
65
Absolute Maximum Ratings
65
Power Supply Ratings
66
Operating Temperature
66
Current Consumption
66
Table 33: the Module Current Consumption
67
RF Output Power
68
RF Receiving Sensitivity
68
Electrostatic Discharge
68
Table 36: Electrostatics Discharge Characteristics
69
7 Mechanical Dimensions
70
Mechanical Dimensions of the Module
70
Figure 41: Uc20 Bottom Dimensions (Bottom View)
71
Figure 42: Bottom Pads Dimensions (Bottom View)
72
Footprint of Recommendation
73
Top View of the Module
74
Bottom View of the Module
74
8 Storage and Manufacturing
75
Storage
75
Manufacturing and Welding
75
Packaging
76
Figure 47: Carrier Tape
77
9 Appendix A Reference
78
Other manuals for Quectel UC20
Application Note
30 pages
User Guide
33 pages
Hardware Design
83 pages
4
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Quectel UC20 Specifications
General
Brand
Quectel
Model
UC20
Category
Control Unit
Language
English
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