Quectel Wireless Solutions 201603EC20 User Manual
EC20 Hardware Design
LTE Module Series
Rev. EC20_Hardware_Design
Date: 2015-10-23
www.quectel.com
LTE Module
EC20 Hardware Design
Our aim is to provide customers with timely and comprehensive service. For any
assistance, please contact our company headquarters:
Quectel Wireless Solutions Co., Ltd.
Office 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233
Tel: +86 21 5108 6236
Mail: info@quectel.com
Or our local office, for more information, please visit:
http://www.quectel.com/support/salesupport.aspx
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GENERAL NOTES
QUECTEL OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION
PROVIDED IS BASED UPON CUSTOMERS’ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT
TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT
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THIS INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF
QUECTEL CO., LTD. TRANSMITTABLE, REPRODUCTION, DISSEMINATION AND EDITING OF THIS
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ARE RESERVED IN THE EVENT OF A PATENT GRANT OR REGISTRATION OF A UTILITY MODEL
OR DESIGN.
Copyright © Quectel Wireless Solutions Co., Ltd. 2015. All rights reserved.
EC20_Hardware_Design Confidential / Released 1 / 83
LTE Module
Revision
Date
Author
Description
1.0
2015-02-13
Mountain ZHOU/
Mike ZHANG
Initial
1.1
2015-08-14
Mountain ZHOU
1. Added UART interface pins
2. Added FOTA upgrade mode
3. Updated module dimension information
4. Updated functional diagram
5. Updated power supply reference circuit
6. Updated description of UART interface
7. Updated current consumption
8. Updated GNSS sensitivity
1.2
2015-10-23
Mountain ZHOU
1. Updated internet protocol
2. Updated UART interface feature
3. Updated functional diagram
4. Updated turning on timing
5. Updated GNSS performance
6. Released USIM_PRESENCE function
EC20 Hardware Design
About the Document
History
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LTE Module
EC20 Hardware Design
Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 5
Figure Index ................................................................................................................................................. 6
1 Introduction .......................................................................................................................................... 7
1.1. Safety Information...................................................................................................................... 8
2 Product Concept .................................................................................................................................. 9
2.1. General Description ................................................................................................................... 9
2.2. Directives and Standards ......................................................................................................... 10
2.2.1. FCC Statement ............................................................................................................... 10
2.2.2. FCC Radiation Exposure Statement .............................................................................. 10
2.3. Key Features ........................................................................................................................... 11
2.4. Functional Diagram ................................................................................................................. 13
2.5. Evaluation Board ..................................................................................................................... 14
3 Application Interface ......................................................................................................................... 15
3.1. General Description ................................................................................................................. 15
3.2. Pin Assignment ........................................................................................................................ 16
3.3. Pin Description ......................................................................................................................... 17
3.4. Operating Modes ..................................................................................................................... 22
3.5. Power Saving ........................................................................................................................... 23
3.5.1. Sleep Mode .................................................................................................................... 23
3.5.1.1. UART Application ................................................................................................. 23
3.5.1.2. USB Application with USB Remote Wakeup Function ........................................ 24
3.5.1.3. USB Application with USB Suspend/Resume and RI Function .......................... 25
3.5.1.4. USB Application without USB Suspend Function ................................................ 25
3.5.2. Airplane Mode ................................................................................................................ 26
3.6. Power Supply ........................................................................................................................... 27
3.6.1. Power Supply Pins ......................................................................................................... 27
3.6.2. Decrease Voltage Drop .................................................................................................. 27
3.6.3. Reference Design for Power Supply .............................................................................. 28
3.6.4. Monitor the Power Supply .............................................................................................. 29
3.7. Turn on and off Scenarios ....................................................................................................... 29
3.7.1. Turn on Module Using the PWRKEY ............................................................................. 29
3.7.2. Turn off Module .............................................................................................................. 31
3.7.2.1. Turn off Module Using the PWRKEY Pin ............................................................. 31
3.7.2.2. Turn off Module Using AT Command ................................................................... 32
3.8. Reset the Module..................................................................................................................... 32
3.9. USIM Card Interface ................................................................................................................ 34
3.10. USB Interface .......................................................................................................................... 36
3.11. UART Interface ........................................................................................................................ 37
3.12. PCM and I2C Interface ............................................................................................................ 40
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EC20 Hardware Design
3.13. ADC Function .......................................................................................................................... 42
3.14. Network Status Indication ........................................................................................................ 43
3.15. Operating Status Indication ..................................................................................................... 44
3.16. Behavior of the RI .................................................................................................................... 45
4 GNSS Receiver ................................................................................................................................... 46
4.1. General Description ................................................................................................................. 46
4.2. GNSS Performance ................................................................................................................. 47
4.3. Layout Guideline ...................................................................................................................... 48
5 Antenna Interface ............................................................................................................................... 49
5.1. Main/Rx-diversity Antenna Interface ........................................................................................ 49
5.1.1. Pin Definition .................................................................................................................. 49
5.1.2. Operating Frequency ..................................................................................................... 49
5.1.3. Reference Design .......................................................................................................... 50
5.2. GNSS Antenna Interface ......................................................................................................... 50
5.3. Antenna Installation ................................................................................................................. 51
5.3.1. Antenna Requirement .................................................................................................... 51
5.3.2. Install the Antenna with RF Connector .......................................................................... 52
6 Electrical, Reliability and Radio Characteristics ............................................................................ 55
6.1. Absolute Maximum Ratings ..................................................................................................... 55
6.2. Power Supply Ratings ............................................................................................................. 56
6.3. Operating Temperature ............................................................................................................ 56
6.4. Current Consumption .............................................................................................................. 57
6.5. RF Output Power ..................................................................................................................... 58
6.6. RF Receiving Sensitivity .......................................................................................................... 58
6.7. Electrostatic Discharge ............................................................................................................ 59
7 Mechanical Dimensions .................................................................................................................... 60
7.1. Mechanical Dimensions of the Module.................................................................................... 60
7.2. Footprint of Recommendation ................................................................................................. 62
7.3. Top View of the Module ........................................................................................................... 65
7.4. Bottom View of the Module ...................................................................................................... 65
8 Storage and Manufacturing .............................................................................................................. 66
8.1. Storage..................................................................................................................................... 66
8.2. Manufacturing and Welding ..................................................................................................... 66
8.3. Packaging ................................................................................................................................ 68
9 Appendix A Reference ....................................................................................................................... 69
10 Appendix B GPRS Coding Scheme ................................................................................................. 73
11 Appendix C GPRS Multi-slot Class .................................................................................................. 74
12 Appendix D EDGE Modulation and Coding Scheme ..................................................................... 75
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EC20 Hardware Design
Table Index
TABLE 1: EC20 FREQUENCY BANDS .............................................................................................................. 9
TABLE 2: EC20 KEY FEATURES ...................................................................................................................... 11
TABLE 3: IO PARAMETERS DEFINITION ........................................................................................................ 17
TABLE 4: PIN DESCRIPTION ........................................................................................................................... 17
TABLE 5: OVERVIEW OF OPERATING MODES ............................................................................................. 22
TABLE 6: VBAT AND GND PINS ....................................................................................................................... 27
TABLE 7: PWRKEY PIN DESCRIPTION .......................................................................................................... 29
TABLE 8: RESET_N PIN DESCRIPTION ......................................................................................................... 32
TABLE 9: PIN DEFINITION OF THE USIM INTERFACE ................................................................................. 34
TABLE 10: USB PIN DESCRIPTION ................................................................................................................ 36
TABLE 11: PIN DEFINITION OF THE UART INTERFACE ............................................................................... 37
TABLE 12: PIN DEFINITION OF THE DEBUG UART INTERFACE ................................................................. 38
TABLE 13: LOGIC LEVELS OF DIGITAL I/O .................................................................................................... 38
TABLE 14: PIN DEFINITION OF PCM AND I2C INTERFACE .......................................................................... 41
TABLE 15: PIN DEFINITION OF THE ADC ...................................................................................................... 42
TABLE 16: CHARACTERISTIC OF THE ADC .................................................................................................. 43
TABLE 17: PIN DEFINITION OF NETWORK INDICATOR ............................................................................... 43
TABLE 18: WORKING STATE OF THE NETWORK INDICATOR..................................................................... 43
TABLE 19: PIN DEFINITION OF STATUS ........................................................................................................ 44
TABLE 20: BEHAVIOR OF THE RI ................................................................................................................... 45
TABLE 21: GNSS PERFORMANCE ................................................................................................................. 47
TABLE 22: PIN DEFINITION OF THE RF ANTENNA ....................................................................................... 49
TABLE 23: THE MODULE OPERATING FREQUENCIES ................................................................................ 49
TABLE 24: PIN DEFINITION OF GNSS ANTENNA .......................................................................................... 50
TABLE 25: GNSS FREQUENCY ....................................................................................................................... 51
TABLE 26: ANTENNA REQUIREMENTS .......................................................................................................... 51
TABLE 27: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 55
TABLE 28: THE MODULE POWER SUPPLY RATINGS .................................................................................. 56
TABLE 29: OPERATING TEMPERATURE ........................................................................................................ 56
TABLE 30: EC20 CURRENT CONSUMPTION ................................................................................................. 57
TABLE 34: CONDUCTED RF OUTPUT POWER ................................................................... 错误!未定义书签。
TABLE 35: EC20 CONDUCTED RF RECEIVING SENSITIVITY ...................................................................... 59
TABLE 39: ELECTROSTATICS DISCHARGE CHARACTERISTICS ............................................................... 59
TABLE 40: RELATED DOCUMENTS ................................................................................................................ 69
TABLE 41: TERMS AND ABBREVIATIONS ...................................................................................................... 69
TABLE 42: DESCRIPTION OF DIFFERENT CODING SCHEMES .................................................................. 73
TABLE 43: GPRS MULTI-SLOT CLASSES ...................................................................................................... 74
TABLE 44: EDGE MODULATION AND CODING SCHEME ............................................................................. 75
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EC20 Hardware Design
Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 14
FIGURE 2: PIN ASSIGNMENT (TOP VIEW)..................................................................................................... 16
FIGURE 3: UART SLEEP APPLICATION ......................................................................................................... 23
FIGURE 4: SLEEP APPLICATION WITH USB REMOTE WAKEUP ................................................................ 24
FIGURE 5: SLEEP APPLICATION WITH RI ..................................................................................................... 25
FIGURE 6: SLEEP APPLICATION WITHOUT SUSPEND FUNCTION ............................................................ 26
FIGURE 7: POWER SUPPLY LIMITS DURING TRANSMIT BURST ............................................................... 28
FIGURE 8: STAR STRUCTURE OF THE POWER SUPPLY............................................................................ 28
FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY .............................................................................. 29
FIGURE 10: TURN ON THE MODULE USING DRIVING CIRCUIT ................................................................. 30
FIGURE 11: TURN ON THE MODULE USING KEYSTROKE .......................................................................... 30
FIGURE 12: TIMING OF TURNING ON MODULE ........................................................................................... 31
FIGURE 13: TIMING OF TURNING OFF MODULE ......................................................................................... 32
FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT ...................................... 33
FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON ...................................................... 33
FIGURE 16: TIMING OF RESETTING MODULE ............................................................................................. 33
FIGURE 17: REFERENCE CIRCUIT OF 8-PIN USIM CONNECTOR .............................................................. 34
FIGURE 18: REFERENCE CIRCUIT OF 6-PIN USIM CONNECTOR .............................................................. 35
FIGURE 19: TEST POINTS FOR FIRMWARE UPGRADE .............................................................................. 36
FIGURE 20: REFERENCE CIRCUIT WITH TRANSLATOR CHIP ................................................................... 39
FIGURE 21: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT .............................................................. 39
FIGURE 22: PRIMARY MODE TIMING ............................................................................................................ 40
FIGURE 23: AUXILIARY MODE TIMING .......................................................................................................... 41
FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC .................................... 42
FIGURE 25: REFERENCE CIRCUIT OF THE NETWORK INDICATOR .......................................................... 44
FIGURE 26: REFERENCE CIRCUIT OF THE STATUS ................................................................................... 44
FIGURE 27: REFERENCE CIRCUIT OF ANTENNA INTERFACE ................................................................... 50
FIGURE 28: REFERENCE CIRCUIT OF GNSS ANTENNA ............................................................................. 51
FIGURE 29: DIMENSIONS OF THE UF.L-R-SMT CONNECTOR (UNIT: MM) ................................................ 53
FIGURE 30: MECHANICALS OF UF.L-LP CONNECTORS ............................................................................. 53
FIGURE 31: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 54
FIGURE 32: MODULE TOP AND SIDE DIMENSIONS ..................................................................................... 60
FIGURE 33: MODULE BOTTOM DIMENSIONS (BOTTOM VIEW) ................................................................. 61
FIGURE 34: BOTTOM PADS DIMENSIONS (BOTTOM VIEW) ....................................................................... 61
FIGURE 35: RECOMMENDED FOOTPRINT (TOP VIEW) .............................................................................. 62
FIGURE 36: RECOMMENDED STENCIL ......................................................................................................... 63
FIGURE 37: RECOMMENDED FOOTPRINT WITH PINS 117~140 ................................................................ 64
FIGURE 38: TOP VIEW OF THE MODULE ...................................................................................................... 65
FIGURE 39: BOTTOM VIEW OF THE MODULE .............................................................................................. 65
FIGURE 40: LIQUIDS TEMPERATURE ............................................................................................................ 67
FIGURE 41: CARRIER TAPE ............................................................................................................................ 68
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LTE Module
EC20 Hardware Design
1 Introduction
This document defines the EC20 module and describes its air interface and hardware interface which are
connected with your application.
This document can help you quickly understand module interface specifications, electrical, mechanical
details and related product information of EC20 module. Associated with application notes and user guide,
you can use EC20 module to design and set up mobile applications easily.
EC20_Hardware_Design Confidential / Released 7 / 83
LTE Module
Full attention must be given to driving at all times in order to reduce the risk of an
accident. Using a mobile while driving (even with a handsfree kit) cause distraction
and can lead to an accident. You must comply with laws and regulations restricting
the use of wireless devices while driving.
Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it
switched off. The operation of wireless appliances in an aircraft is forbidden to
prevent interference with communication systems. Consult the airline staff about
the use of wireless devices on boarding the aircraft, if your device offers a Airplane
Mode which must be enabled prior to boarding an aircraft.
Switch off your wireless device when in hospitals or clinics or other health care
facilities. These requests are desinged to prevent possible interference with
sentitive medical equipment.
Cellular terminals or mobiles operate over radio frequency signal and cellular
network and cannot be guaranteed to connect in all conditions, for example no
mobile fee or an invalid SIM card. While you are in this condition and need
emergent help, please remember using emergency call. In order to make or
receive call, the cellular terminal or mobile must be switched on and in a service
area with adequate cellular signal strength.
Your cellular terminal or mobile contains a transmitter and receiver. When it is ON ,
it receives and transmits radio frequency energy. RF interference can occur if it is
used close to TV set, radio, computer or other electric equipment.
In locations with potencially explosive atmospheres, obey all posted signs to turn
off wireless devices such as your phone or other cellular terminals. Areas with
potencially exposive atmospheres including fuelling areas, below decks on boats,
fuel or chemical transfer or storage facilities, areas where the air contains
chemicals or particles such as grain, dust or metal powders.
EC20 Hardware Design
1.1. Safety Information
The following safety precautions must be observed during all phases of the operation, such as usage,
service or repair of any cellular terminal or mobile incorporating EC20 module. Manufacturers of the cellular
terminal should send the following safety information to users and operating personnel and to incorporate
these guidelines into all manuals supplied with the product. If not so, Quectel does not take on any liability
for customer failure to comply with these precautions.
EC20_Hardware_Design Confidential / Released 8 / 83
LTE Module
1.
1)
GPS and GLONASS function is optional.
EC20
FDD-LTE
(with Rx-diversity)
B2/B4/B5/B12/B17
TDD-LTE
(with Rx-diversity)
Not supported
WCDMA
(with Rx-diversity)
B2/B4/B5
TD-SCDMA
(with Rx-diversity)
Not supported
CDMA
(with Rx-diversity)
Not supported
GSM
850/1900
GNSS
GPS+GLONASS
NOTES
EC20 Hardware Design
2 Product Concept
2.1. General Description
EC20 is a series of LTE-FDD/WCDMA/GSM wireless communication module with receive diversity, which
provides data connectivity on FDD-LTE, DC-HSPA+, HSPA+, HSDPA, HSUPA, WCDMA, EDGE and
GPRS networks. It can also provide GPS/GLONASS1) and voice functionality for your specific application.
Table 1: EC20 Frequency Bands
With a tiny profile of 32.0mm × 29.0mm × 2.4mm, EC20 can meet almost all requirements for M2M
application such as automotive, metering, tracking system, security solutions, routers, wireless POS,
mobile computing devices, PDA phone and tablet PC, etc..
EC20 is an SMD type module, which can be embedded in application through its 140-pin pads including
EC20_Hardware_Design Confidential / Released 9 / 83
LTE Module
Part
Number
Frequency Range (MHz)
Peak Gain
(XZ-V)
Average
Gain(XZ-V)
VS
WR
Impedanc
e
GSM850:824～894MHz
3R007
PCS1900: 1850～1990MHz
UMTS B2: 1850～1990MHz
UMTS B4: 1710～2155MHz
UMTS B5: 824～894MHz
1 dBi typ.
1 dBi typ.
2 max
50Ω
FDD B2: 1850～1990MHz
FDD B4: 1710～2155MHz
FDD B5: 824～894MHz
FDD B12: 699～746MHz
FDD B17: 704～746MHz
EC20 Hardware Design
76 LCC signal pads and 64 other pads.
2.2. Directives and Standards
The EC20 module is designed to comply with the FCC statements. FCC ID: XMR201603EC20
The Host system using EC20 should have label “contains modular’s FCC ID: XMR201603EC20”.
2.2.1. FCC Statement
Changes or modifications not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
2.2.2. FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This equipment should be installed and operated with minimum distance 20cm between the radiator and
your body as well as kept minimum 20cm from radio antenna depending on the Mobile status of this
module usage. This module should NOT be installed and operating simultaneously with other radio. The
manual of the host system, which uses EC20, must include RF exposure warning statement to advice
user should keep minimum 20cm from the radio antenna of EC20 module depending on the Mobile status.
Note: If a portable device (such as PDA) uses EC20 module, the device needs to do permissive change
and SAR testing.
The following list indicates the performance of antenna gain in certificate testing.
EC20_Hardware_Design Confidential / Released 10 / 83
LTE Module
Feature
Details
Power Supply
Supply voltage: 3.3V~4.3V Typical supply voltage: 3.8V
Transmitting Power
Class 4 (33dBm±2dB) for GSM850
Class E2 (27dBm±3dB) for GSM850 8-PSK
Class E2 (26dBm±3dB) for PCS1900 8-PSK
Class 3 (24dBm+1/-3dB) for WCDMA bands
Class 3 (23dBm±2dB) for LTE FDD bands
LTE Features
Support 3GPP R9 CAT3 FDD
Support 1.4 to 20MHz RF bandwidth
Support 2 × 2 MIMO in DL direction
FDD: Max 100Mbps (DL), 50Mbps (UL)
WCDMA Features
Support 3GPP R8 DC-HSPA+
Support 16-QAM, 64-QAM and QPSK modulation
3GPP R6 HSUPA: Max 5.76Mbps (UL)
3GPP R8 DC-HSPA+: Max 42Mbps (DL)
GSM Features
R99: CSD: 9.6kbps, 14.4kbps
GPRS:
Support GPRS multi-slot class 12 (12 by default)
Coding scheme: CS-1, CS-2, CS-3 and CS-4
Maximum of four Rx time slots per frame
EDGE:
Support EDGE multi-slot class 12 (12 by default)
Support GMSK and 8-PSK for different MCS (Modulation and Coding
scheme)
Downlink coding schemes: CS 1-4 and MCS 1-9
Uplink coding schemes: CS 1-4 and MCS 1-9
Internet Protocol Features
Support TCP/UDP/PPP/FTP/HTTP/SMTP/MMS/NTP/PING/QMI protocols
Support the protocols PAP (Password Authentication Protocol) and CHAP
(Challenge Handshake Authentication Protocol) usually used for PPP
connections
SMS
Text and PDU mode
Point to point MO and MT
SMS cell broadcast
SMS storage: ME by default
EC20 Hardware Design
2.3. Key Features
The following table describes the detailed features of EC20 module.
Table 2: EC20 Key Features
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LTE Module
USIM Interface
Support USIM/SIM card: 1.8V, 3.0V
Audio Features 1)
Support one digital audio interface: PCM interface
GSM: HR/FR/EFR/AMR/AMR-WB
WCDMA: AMR/AMR-WB
LTE: AMR/AMR-WB
Support echo cancellation and noise suppression
PCM Interface 1)
Used for audio function with external codec
Support 8-bit A-law 2), μ-law 2) and 16-bit linear data formats
Support long frame sync and short frame sync
Support master and slave mode, but must be the master in long frame sync
USB Interface
Compliant with USB 2.0 specification (slave only), the data transfer rate
can reach up to 480Mbps
Used for AT command communication, data transmission, GNSS NMEA
output, software debug and firmware upgrade
USB Driver: Windows XP, Windows Vista, Windows 7, Windows 8/8.1,
Window CE 5.0/6.0/7.0, Linux 2.6 or later, Android 2.3/4.0/4.2/4.4/5.0
UART Interface
Main UART:
Used for AT command and data transmission
Baud rate reach up to 921600bps, 115200bps by default
Support RTS and CTS hardware flow control
Support multiplexing function
Debug UART:
Used for Linux console, log and GNSS NMEA output
115200bps baud rate
Rx-diversity
Support LTE/WCDMA/TD-SCDMA/CDMA Rx-diversity
GNSS Features
gpsOne Gen8A of Qualcomm (GPS and GLONASS)
Protocol: NMEA 0183
AT Commands
Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT
commands
Network Indication
Two pins including NET_MODE and NET_STATUS to indicate network
connectivity status
Antenna Interface
Including main antenna (ANT_MAIN), Rx-diversity antenna (ANT_DIV) and
GNSS antenna (ANT_GNSS)
Physical Characteristics
Size: 32.0±0.15 × 29.0±0.15 × 2.4±0.2mm
Weight: approx. 4.9g
Temperature Range
Normal operation: -35°C ~ +75°C
Restricted operation: -40°C ~ -35°C and +75°C ~ +85°C 3)
Storage temperature: -45°C ~ +90°C
Firmware Upgrade
USB interface and DFOTA
RoHS
All hardware components are fully compliant with EU RoHS directive
EC20 Hardware Design
EC20_Hardware_Design Confidential / Released 12 / 83
LTE Module
1.
1)
Audio (PCM) function is only supported on Telematics version.
2. 2) This function is under development.
3. 3) When the module works within this restricted temperature range, RF performance might degrade.
For example, the frequency error or the phase error would increase.
Baseband
PMIC
Transceiver
2G NAND
1G SDRAM
PA
Switch
LNA
Switch
ANT_MAIN ANT_DIVANT_GNSS
VBAT_BB
VBAT_RF
APT
PWRKEY
ADCs
VDD_EXT USB USIM PCM
UARTI2C
RESET_N
19.2M
XO
STATUS
GPIOs
SAW
SAW
Control
IQ Control
Duplex
SAW
Tx
PRx DRx
NOTES
EC20 Hardware Design
2.4. Functional Diagram
The following figure shows a block diagram of EC20 and illustrates the major functional parts.
Power management
Baseband
DDR+NAND flash
Radio frequency
Peripheral interface
EC20_Hardware_Design Confidential / Released 13 / 83
LTE Module
EC20 Hardware Design
Figure 1: Functional Diagram
2.5. Evaluation Board
In order to help you to develop applications with EC20, Quectel supplies an evaluation board (EVB), USB
data cable, earphone, antenna and other peripherals to control or test the module.
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LTE Module
EC20 Hardware Design
3 Application Interface
3.1. General Description
EC20 is equipped with a 76-pin 1.3mm pitch SMT pads plus 64-pin ground pads and reserved pads that
connect to cellular application platform. Sub-interfaces included in these pads are described in detail in
the following chapters:
Power supply
USIM interface
USB interface
UART interface
PCM interface
ADC interface
Status indication
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LTE Module
35
36
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
1
3
4
5
6
7
2
WAKEUP_IN
AP_READY
RESERVED
W_DISABLE#
NET_MODE
NET_STATUS
VDD_EXT
GND
GND
DBG_RXD
DBG_TXD
USIM_PRESENCE
USIM_VDD
USIM_DATA
USIM_CLK
USIM_RST
RESERVED
8
9
10
11
12
13
14
15
16
17
18
19
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
USIM_GND
GND
RESET_N
PWRKEY
GND
RESERVED
PCM_IN※PCM_OUT※PCM_SYNC※PCM_CLK
※
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
ANT_DIV
GND
GND
USB_VBUS
USB_DM
USB_DP
RXD
TXD
DTR
RTS
CTS
DCD
RI
STATUS
VBAT_BB
VBAT_BB
VBAT_RF
VBAT_RF
GND
RESERVED
GND
GND
ANT_MAIN
GND
ANT_GNSS
GND
ADC1
RESERVED
I2C_SDA
I2C_SCL
RESERVED
ADC0
GND
GND
GND
73
74
75
76
77
78
79
80
81
82
83
84
100
101
102
106
107
111
112
103
104
109
105
110
89
94
98
88
93
97
86
91
96
85
90
95
99
87
92
108
113
RESERVED
RESERVED
117
126
125
124
123
122
121
120
119
118
127
128
115
RESERVED
RESERVED
116
139
140
138
137
136
135
134
133
132
131
130
129
114
RESERVED
Power Pins
RESERVED
RESERVED
RESERVED
Signal Pins RESERVED PinsGND Pins
1. Keep all RESERVED pins and unused pins unconnected.
2. GND pads 85~112 should be connected to ground in the design, and RESERVED pads 73~84
should not be designed in schematic and PCB decal.
3. “※” means these interface functions are only supported on Telematics version.
NOTES
EC20 Hardware Design
3.2. Pin Assignment
The following figure shows the pin assignment of the EC20 module.
Figure 2: Pin Assignment (Top View)
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LTE Module
Type
Description
IO
Bidirectional input/output
DI
Digital input
DO
Digital output
PI
Power input
PO
Power output
AI
Analog input
AO
Analog output
OD
Open drain
Power Supply
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
VBAT_BB
59, 60
PI
Power supply for
module baseband
part.
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
It must be able to
provide sufficient
current up to 0.8A.
VBAT_RF
57, 58
PI
Power supply for
module RF part.
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
It must be able to
provide sufficient
current in a transmitting
burst which typically
rises to 1.8A.
VDD_EXT
7
PO
Provide 1.8V for
external circuit.
Vnorm=1.8V
IOmax=50mA
Power supply for
external GPIO’s pull up
circuits.
GND
8, 9, 19,
22, 36, 46,
48, 50~54,
Ground.
EC20 Hardware Design
3.3. Pin Description
The following tables show the EC20’s pin definition.
Table 3: IO Parameters Definition
Table 4: Pin Description
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LTE Module
56, 72,
85~112
Turn On/Off
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PWRKEY
21
DI
Turn on/off the
module.
VIHmax=2.1V
VIHmin=1.3V
VILmax=0.5V
Pull-up to 1.8V
internally.
RESET_N
20
DI
Reset the module.
VIHmax=2.1V
VIHmin=1.3V
VILmax=0.5V
Pull-up to 1.8V
internally. Active low.
Status Indication
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
STATUS
61
OD
Indicate the module
operating status.
The drive current
should be less than
0.9mA.
Require external
pull-up. If unused,
keep it open.
NET_MODE
5
DO
Indicate the module
network registration
mode.
VOHmin=1.35V
VOLmax=0.45V
1.8V power domain.
If unused, keep it
open.
NET_
STATUS
6
DO
Indicate the module
network activity
status.
VOHmin=1.35V
VOLmax=0.45V
1.8V power domain.
If unused, keep it
open.
USB Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USB_VBUS
71
PI
USB detection.
Vmax=5.25V
Vmin=3.0V
Vnorm=5.0V
USB_DP
69
IO
USB differential data
bus.
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90ohm.
USB_DM
70
IO
USB differential data
bus.
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90ohm.
USIM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USIM_GND
10
Specified ground for
USIM card.
USIM_VDD
14
PO
Power supply for
For 1.8V USIM:
Either 1.8V or 3V is
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LTE Module
USIM card.
Vmax=1.9V
Vmin=1.7V
For 3.0V USIM:
Vmax=3.05V
Vmin=2.7V
IOmax=50mA
supported by the
module automatically.
USIM_DATA
15
IO
Data signal of USIM
card.
For 1.8V USIM:
VILmax=0.6V
VIHmin=1.2V
VOLmax=0.45V
VOHmin=1.35V
For 3.0V USIM:
VILmax=1.0V
VIHmin=1.95V
VOLmax=0.45V
VOHmin=2.55V
USIM_CLK
16
DO
Clock signal of USIM
card.
For 1.8V USIM:
VOLmax=0.45V
VOHmin=1.35V
For 3.0V USIM:
VOLmax=0.45V
VOHmin=2.55V
USIM_RST
17
DO
Reset signal of
USIM card.
For 1.8V USIM:
VOLmax=0.45V
VOHmin=1.35V
For 3.0V USIM:
VOLmax=0.45V
VOHmin=2.55V
USIM_PRE
SENCE
13
DI
USIM card insertion
detection.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RI
62
DO
Ring indicator
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
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LTE Module
DCD
63
DO
Data carrier
detection.
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
CTS
64
DO
Clear to send.
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
RTS
65
DI
Request to send.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
DTR
66
DI
Data terminal ready,
sleep mode control.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
Pull-up by default.
Low level wakes up
the module.
If unused, keep it
open.
TXD
67
DO
Transmit data.
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
RXD
68
DI
Receive data.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
Debug UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
DBG_TXD
12
DO
Transmit data.
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
DBG_RXD
11
DI
Receive data.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
ADC Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ADC0
45
AI
General purpose
analog to digital
converter.
Voltage range:
0.3V to VBAT_BB
If unused, keep it
open.
ADC1
44
AI
General purpose
analog to digital
converter.
Voltage range:
0.3V to VBAT_BB
If unused, keep it
open.
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LTE Module
PCM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PCM_IN
24
DI
PCM data input.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
PCM_OUT
25
DO
PCM data output.
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
PCM_SYNC
26
IO
PCM data frame
sync signal.
VOLmax=0.45V
VOHmin=1.35V
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
In master mode, it is
an output signal. In
slave mode, it is an
input signal.
If unused, keep it
open.
PCM_CLK
27
IO
PCM clock.
VOLmax=0.45V
VOHmin=1.35V
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
In master mode, it’s
an output signal. In
slave mode, it is an
input signal.
If unused, keep it
open.
I2C Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
I2C_SCL
41
OD
I2C serial clock.
External pull-up
resistor is required.
1.8V only. If unused,
keep it open.
I2C_SDA
42
OD
I2C serial data.
External pull-up
resistor is required.
1.8V only. If unused,
keep it open.
RF Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ANT_DIV
35
AI
Diversity antenna.
50ohm impedance.
If unused, keep it
open.
ANT_MAIN
49
IO
Main antenna.
50ohm impedance.
ANT_GNSS
47
AI
GNSS antenna.
50ohm impedance.
If unused, keep it
open.
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LTE Module
GPIO Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
WAKEUP_IN
1
DI
Sleep mode control.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
Pull-up by default.
Low level wakes up
the module. If
unused, keep it open.
W_DISABLE#
4
DI
Airplane mode
control.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
Pull-up by default.
In low voltage level,
module can enter into
airplane mode. If
unused, keep it open.
AP_READY
2
DI
Application
processor sleep
state detection.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
RESERVED Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RESERVED
3, 18, 23,
28~34,
37~40, 43,
55, 73~84,
113~140
Reserved.
Keep these pins
unconnected.
Mode
Details
Normal
Operation
Idle
Software is active. The module has registered to the network, and the
module is ready to send and receive data.
Talk/Data
Network connection is ongoing. In this mode, the power consumption is
decided by network setting and data transfer rate.
Minimum
AT+CFUN command can set the module entering into a minimum functionality mode
EC20 Hardware Design
3.4. Operating Modes
The table below briefly summarizes the various operating modes referred in the following chapters.
Table 5: Overview of Operating Modes
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