Quectel Wireless Solutions 201607EC25V User Manual
EC25-V
User Manual
LTE Module Series
Rev. EC25-V_User_Manual_V1.0
Date: 2016-03-28
www.quectel.com
LTE Module Series
EC25-V User Manual
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
For technical support, to report documentation errors, please visit:
http://www.quectel.com/support/techsupport.aspx
Or Email: Support@quectel.com
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
MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT
ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR
RELIANCE UPON THE INFORMATION. THE INFORMATION SUPPLIED HEREIN IS SUBJECT TO
CHANGE WITHOUT PRIOR NOTICE.
COPYRIGHT
THIS INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF
QUECTEL CO., LTD. TRANSMITTABLE, REPRODUCTION, DISSEMINATION AND EDITING OF THIS
DOCUMENT AS WELL AS UTILIZATION OF THIS CONTENTS ARE FORBIDDEN WITHOUT
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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. 2016. All rights reserved.
EC25-V_User_Manual Confidential / Released 1 / 69
About the Document
Revision
Date
Author
Description
V1.0
2016-03-28
Woody WU
Initial
History
LTE Module Series
EC25-V User Manual
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EC25-V User Manual
Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 5
Figure Index ................................................................................................................................................. 6
1 Introduction .......................................................................................................................................... 7
1.1. Safety Information...................................................................................................................... 7
2 Product Concept .................................................................................................................................. 9
2.1. General Description ................................................................................................................... 9
2.2. Directives and Standards ........................................................................................................ 10
2.2.1. FCC Statement .............................................................................................................. 10
2.3. Key Features ........................................................................................................................... 10
2.4. Functional Diagram ................................................................................................................. 12
2.5. Evaluation Board ..................................................................................................................... 13
3 Application Interface ......................................................................................................................... 14
3.1. General Description ................................................................................................................. 14
3.2. Pin Assignment ........................................................................................................................ 14
3.3. Pin Description ......................................................................................................................... 16
3.4. Operating Modes ..................................................................................................................... 21
3.5. Power Saving ........................................................................................................................... 22
3.5.1. Sleep Mode .................................................................................................................... 22
3.5.1.1. UART Application ................................................................................................. 22
3.5.1.2. USB Application with USB Remote Wakeup Function ........................................ 23
3.5.1.3. USB Application with USB Suspend/Resume and RI Function .......................... 23
3.5.1.4. USB Application without USB Suspend Function ................................................ 24
3.5.2. Airplane Mode ................................................................................................................ 25
3.6. Power Supply ........................................................................................................................... 25
3.6.1. Power Supply Pins ......................................................................................................... 25
3.6.2. Decrease Voltage Drop .................................................................................................. 26
3.6.3. Reference Design for Power Supply .............................................................................. 27
3.6.4. Monitor the Power Supply .............................................................................................. 28
3.7. Turn on and off Scenarios ....................................................................................................... 28
3.7.1. Turn on Module Using the PWRKEY ............................................................................. 28
3.7.2. Turn off Module .............................................................................................................. 30
3.7.2.1. Turn off Module Using the PWRKEY Pin ............................................................. 30
3.7.2.2. Turn off Module Using AT Command ................................................................... 30
3.8. Reset the Module..................................................................................................................... 30
3.9. USIM Card Interface ................................................................................................................ 32
3.10. USB Interface .......................................................................................................................... 34
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3.11. UART Interface ........................................................................................................................ 36
3.12. PCM and I2C Interface ............................................................................................................ 38
3.13. ADC Function .......................................................................................................................... 41
3.14. Network Status Indication ........................................................................................................ 41
3.15. STATUS ................................................................................................................................... 42
3.16. Behavior of the RI .................................................................................................................... 43
4 GNSS Receiver ................................................................................................................................... 45
4.1. General Description ................................................................................................................. 45
4.2. GNSS Performance ................................................................................................................. 45
4.3. Layout Guideline ...................................................................................................................... 46
5 Antenna Interface ............................................................................................................................... 47
5.1. Main/Rx-diversity Antenna Interface ........................................................................................ 47
5.1.1. Pin Definition .................................................................................................................. 47
5.1.2. Operating Frequency ..................................................................................................... 47
5.1.3. Reference Design .......................................................................................................... 47
5.2. GNSS Antenna Interface ......................................................................................................... 48
5.3. Antenna Installation ................................................................................................................. 49
5.3.1. Antenna Requirement .................................................................................................... 49
5.3.2. Install the Antenna with RF Connector .......................................................................... 50
6 Electrical, Reliability and Radio Characteristics ............................................................................ 53
6.1. Absolute Maximum Ratings ..................................................................................................... 53
6.2. Power Supply Ratings ............................................................................................................. 53
6.3. Operating Temperature ............................................................................................................ 54
6.4. Current Consumption .............................................................................................................. 54
6.5. RF Output Power ..................................................................................................................... 54
6.6. RF Receiving Sensitivity .......................................................................................................... 55
6.7. Electrostatic Discharge ............................................................................................................ 55
7 Mechanical Dimensions .................................................................................................................... 56
7.1. Mechanical Dimensions of the Module.................................................................................... 56
7.2. Footprint of Recommendation ................................................................................................. 58
7.3. Top View of the Module ........................................................................................................... 59
7.4. Bottom View of the Module ...................................................................................................... 59
8 Storage and Manufacturing .............................................................................................................. 60
8.1. Storage .................................................................................................................................... 60
8.2. Manufacturing and Welding ..................................................................................................... 60
8.3. Packaging ................................................................................................................................ 61
9 Appendix A Reference ....................................................................................................................... 63
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Table Index
TABLE 1: EC25 SERIES FREQUENCY BANDS ................................................................................................ 9
TABLE 2: EC25 KEY FEATURES ..................................................................................................................... 10
TABLE 3: IO PARAMETERS DEFINITION ........................................................................................................ 16
TABLE 4: PIN DESCRIPTION ........................................................................................................................... 16
TABLE 5: OVERVIEW OF OPERATING MODES ............................................................................................. 21
TABLE 6: VBAT AND GND PINS ....................................................................................................................... 26
TABLE 7: PWRKEY PIN DESCRIPTION .......................................................................................................... 28
TABLE 8: RESET_N PIN DESCRIPTION ......................................................................................................... 31
TABLE 9: PIN DEFINITION OF THE USIM INTERFACE ................................................................................. 32
TABLE 10: USB PIN DESCRIPTION ................................................................................................................ 34
TABLE 11: PIN DEFINITION OF THE MAIN UART INTERFACE ..................................................................... 36
TABLE 12: PIN DEFINITION OF THE DEBUG UART INTERFACE ................................................................. 36
TABLE 13: LOGIC LEVELS OF DIGITAL I/O .................................................................................................... 37
TABLE 14: PIN DEFINITION OF PCM AND I2C INTERFACE .......................................................................... 39
TABLE 15: PIN DEFINITION OF THE ADC ...................................................................................................... 41
TABLE 16: CHARACTERISTIC OF THE ADC .................................................................................................. 41
TABLE 17: PIN DEFINITION OF NETWORK INDICATOR ............................................................................... 41
TABLE 18: WORKING STATE OF THE NETWORK INDICATOR..................................................................... 42
TABLE 19: PIN DEFINITION OF STATUS ........................................................................................................ 43
TABLE 20: BEHAVIOR OF THE RI ................................................................................................................... 44
TABLE 21: GNSS PERFORMANCE ................................................................................................................. 45
TABLE 22: PIN DEFINITION OF THE RF ANTENNA ....................................................................................... 47
TABLE 23: THE MODULE OPERATING FREQUENCIES ................................................................................ 47
TABLE 24: PIN DEFINITION OF GNSS ANTENNA .......................................................................................... 48
TABLE 25: GNSS FREQUENCY ....................................................................................................................... 49
TABLE 26: ANTENNA REQUIREMENTS .......................................................................................................... 49
TABLE 27: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 53
TABLE 28: THE MODULE POWER SUPPLY RATINGS .................................................................................. 53
TABLE 29: OPERATING TEMPERATURE ........................................................................................................ 54
TABLE 30: CONDUCTED RF OUTPUT POWER ............................................................................................. 55
TABLE 31: ELECTROSTATICS DISCHARGE CHARACTERISTICS ............................................................... 55
TABLE 32: RELATED DOCUMENTS ................................................................................................................ 63
TABLE 33: TERMS AND ABBREVIATIONS ...................................................................................................... 63
TABLE 34: DESCRIPTION OF DIFFERENT CODING SCHEMES .................................................................. 67
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EC25-V User Manual
Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ........................................................................................................ 12
FIGURE 2: PIN ASSIGNMENT (TOP VIEW) ............................................................................................. 15
FIGURE 3: UART SLEEP APPLICATION .................................................................................................. 22
FIGURE 4: SLEEP APPLICATION WITH USB REMOTE WAKEUP ........................................................ 23
FIGURE 5: SLEEP APPLICATION WITH RI ............................................................................................. 24
FIGURE 6: SLEEP APPLICATION WITHOUT SUSPEND FUNCTION .................................................... 24
FIGURE 7: POWER SUPPLY LIMITS DURING TRANSMIT BURST ....................................................... 26
FIGURE 8: STAR STRUCTURE OF THE POWER SUPPLY .................................................................... 27
FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY ....................................................................... 27
FIGURE 10: TURN ON THE MODULE USING DRIVING CIRCUIT ......................................................... 28
FIGURE 11: TURN ON THE MODULE USING KEYSTROKE .................................................................. 29
FIGURE 12: TIMING OF TURNING ON MODULE ................................................................................... 29
FIGURE 13: TIMING OF TURNING OFF MODULE .................................................................................. 30
FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT .............................. 31
FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON .............................................. 31
FIGURE 16: TIMING OF RESETTING MODULE ...................................................................................... 32
FIGURE 17: REFERENCE CIRCUIT OF 8-PIN USIM CONNECTOR ...................................................... 33
FIGURE 18: REFERENCE CIRCUIT OF 6-PIN USIM CONNECTOR ...................................................... 33
FIGURE 19: REFERENCE CIRCUIT OF USB APPLICATION ................................................................. 35
FIGURE 20: REFERENCE CIRCUIT WITH TRANSLATOR CHIP............................................................ 37
FIGURE 21: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT ...................................................... 38
FIGURE 22: PRIMARY MODE TIMING ..................................................................................................... 39
FIGURE 23: AUXILIARY MODE TIMING ................................................................................................... 39
FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC ............................ 40
FIGURE 25: REFERENCE CIRCUIT OF THE NETWORK INDICATOR .................................................. 42
FIGURE 26: REFERENCE CIRCUIT OF THE STATUS............................................................................ 43
FIGURE 27: REFERENCE CIRCUIT OF ANTENNA INTERFACE ........................................................... 48
FIGURE 28: REFERENCE CIRCUIT OF GNSS ANTENNA ..................................................................... 49
FIGURE 29: DIMENSIONS OF THE UF.L-R-SMT CONNECTOR (UNIT: MM) ........................................ 50
FIGURE 30: MECHANICALS OF UF.L-LP CONNECTORS ..................................................................... 51
FIGURE 31: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ................................................... 52
FIGURE 32: MODULE TOP AND SIDE DIMENSIONS ............................................................................. 56
FIGURE 33: MODULE BOTTOM DIMENSIONS (BOTTOM VIEW) ......................................................... 57
FIGURE 34: RECOMMENDED FOOTPRINT (TOP VIEW) ...................................................................... 58
FIGURE 35: TOP VIEW OF THE MODULE .............................................................................................. 59
FIGURE 36: BOTTOM VIEW OF THE MODULE ...................................................................................... 59
FIGURE 37: LIQUIDS TEMPERATURE .................................................................................................... 61
FIGURE 38: CARRIER TAPE .................................................................................................................... 62
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LTE Module Series
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) causes
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 is
switched off. The operation of wireless appliances in an aircraft is forbidden, so as
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, clinics or other health care
facilities. These requests are desinged to prevent possible interference with
sentitive medical equipment.
EC25-V User Manual
1 Introduction
This document defines the EC25 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 and
mechanical details, as well as other related information of EC25 module. Associated with application
notes and user guide, you can use EC25 module to design and set up mobile applications easily.
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 EC25 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 assumes no liability for the
customer’s failure to comply with these precautions.
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Cellular terminals or mobiles operating over radio frequency signal and cellular
network cannot be guaranteed to connect in all conditions, for example no mobile
fee or with 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 a 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 explosive atmospheres include 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, etc.
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EC25-V User Manual
2 Product Concept
2.1. General Description
EC25 contains four variants: EC25-E, EC25-A, EC25-V and EC25-AUT. You can choose the dedicated
type based on the region or operator. The following table shows the frequency bands of EC25 series
modules.
Table 1: EC25 Series Frequency Bands
EC25-V
FDD-LTE
(with Rx-diversity)
TDD-LTE
(with Rx-diversity)
WCDMA
(with Rx-diversity)
GSM Not supported
GNSS
NOTES
1)
1.
GNSS function is optional.
2)
2.
EC25-V includes Data-only and Telematics versions. Data-only version does not support voice
function, while Telematics version supports it.
B4/B13
Not supported
Not supported
GPS,GLONASS,
BeiDou/Compass,Galileo,QZSS
With a tiny profile of 32.0mm × 29.0mm × 2.4mm, EC25 can meet almost all requirements for M2M
applications such as automotive, metering, tracking system, security, router, wireless POS, mobile
computing device, PDA phone and tablet PC, etc.
EC25 is an SMD type module which can be embedded in applications through its 144-pin pads, including
80 LCC signal pads and 64 other pads.
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Feature
Details
Power Supply
Supply voltage: 3.3V~4.3V Typical supply voltage: 3.8V
Transmitting Power
LTE Features
Internet Protocol Features
Text and PDU mode
Point to point MO and MT
SMS cell broadcast
SMS storage: ME by default
SMS
Support USIM/SIM card: 1.8V, 3.0V
USIM Interface
Used for audio function with external codec
Support 8-bit A-law, μ-law and 16-bit linear data formats
Support long frame sync and short frame sync
EC25-V User Manual
2.2. Directives and Standards
2.2.1. FCC Statement
Any Changes or modifications not expressly approved by the party responsible for compliance could void
the user’s authority to operate the equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
2.3. Key Features
The following table describes the detailed features of EC25 module.
Table 2: EC25 Key Features
Support up to non-CA CAT4
Support 1.4 to 20MHz RF bandwidth
FDD: Max 50Mbps (UL), 150Mbps (DL)
TDD: Max 35Mbps (UL), 130Mbps (DL)
Support 16-QAM, 64-QAM and QPSK modulation
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Support master and slave mode, but must be the master in long frame sync
Audio Features
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
PCM 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
Debug UART:
Used for Linux console, log output
115200bps baud rate
USB Interface
Support LTE Rx-diversity
UART Interface
Gen8C-Lite of Qualcomm
Protocol: NMEA 0183
LTE Module Series
EC25-V User Manual
GNSS Features
AT Commands
Network Indication
Two pins including NET_MODE and NET_STATUS to indicate network
connectivity status
Including main antenna (ANT_MAIN), Rx-diversity antenna (ANT_DIV) and
GNSS antenna (ANT_GNSS)
Size: 32.0±0.15 × 29.0±0.15 × 2.4±0.2mm
Weight: approx. 4.9g
Normal operation: -35°C ~ +75°C
Antenna Interface
Restricted operation: -40°C ~ -35°C and +75°C ~ +85°C
Storage temperature: -45°C ~ +90°C
Physical Characteristics USB interface
Temperature Range All hardware components are fully compliant with EU RoHS directive
Firmware Upgrade
RoHS
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Baseband
PMIC
Transceiver
NAND
DDR2
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
Control
IQ Control
Duplex
SAW
Tx
PRx DRx
EC25-V User Manual
2.4. Functional Diagram
The following figure shows a block diagram of EC25 and illustrates the major functional parts.
Power management
Baseband
DDR+NAND flash
Radio frequency
Peripheral interface
Figure 1: Functional Diagram
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EC25-V User Manual
2.5. Evaluation Board
In order to help you to develop applications with EC25, Quectel supplies an evaluation board (EVB), USB
data cable, earphone, antenna and other peripherals to control or test the module.
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EC25-V User Manual
3 Application Interface
3.1. General Description
EC25 is equipped with an 80-pin SMT pad plus 64-pin ground pads and reserved pads that can be
connected 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
3.2. Pin Assignment
The following figure shows the pin assignment of the EC25 module.
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34335
36
20212223242526272829303132
33
1
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
7271706968676665646362616059585756
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 Pins
GND Pins
RESERVED
RESERVED
141
142
RESERVED
RESERVED
143
144
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
EC25-V User Manual
Figure 2: Pin Assignment (Top View)
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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 up to 1.8A in a
transmitting burst.
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,
56, 72,
Ground.
EC25-V User Manual
3.3. Pin Description
The following tables show the EC25’s pin definition.
Table 3: IO Parameters Definition
Table 4: Pin Description
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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
RESET_N
20
DI
Reset the module.
VIHmax=2.1V
VIHmin=1.3V
VILmax=0.5V
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.
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
USIM card.
For 1.8V USIM:
Vmax=1.9V
Vmin=1.7V
Either 1.8V or 3V is
supported by the
module automatically.
EC25-V User Manual
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For 3.0V USIM:
Vmax=3.05V
Vmin=2.7V
IOmax=50mA
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_
PRESENCE
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
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
DCD
63
DO
Data carrier
detection.
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
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LTE Module Series
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.
PCM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
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LTE Module Series
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 is
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.
Used for external
codec.
External pull-up
resistor is required.
1.8V only. If unused,
keep it open.
I2C_SDA
42
OD
I2C serial data.
Used for external
codec.
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.
GPIO Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
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