EC25-A
User Manual
LTE Module Series
Rev. EC25-A_User_Manual_V1.0
Date: 2016-03-28
www.quectel.com
LTE Module
EC25-A 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
PERMISSION. OFFENDERS WILL BE HELD LIABLE FOR PAYMENT OF DAMAGES. ALL RIGHTS
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-A_User_Manual Confidential / Released 1 / 7
0
LTE Module
EC25-A User Manual
About the Document
History
Revision Date Author Description
V1.0 2016-03-28 Woody WU Initial
EC25-A_User_Manual Confidential / Released 2 / 7
0
LTE Module
EC25-A 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
EC25-A_User_Manual Confidential / Released 3 / 7
0
LTE Module
EC25-A User Manual
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 ......................................................................................................... 48
5.2. GNSS Antenna Interface ....................................................................................................... 48
5.3. Antenna Installation .............................................................................................................. 50
5.3.1. Antenna Requirement .................................................................................................. 50
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 .................................................................................................................... 57
7.1. Mechanical Dimensions of the Module ............................................................................... 57
7.2. Footprint of Recommendation ............................................................................................. 59
7.3. Top View of the Module ........................................................................................................ 60
7.4. Bottom View of the Module .................................................................................................. 60
8 Storage and Manufacturing .............................................................................................................. 61
8.1. Storage.................................................................................................................................... 61
8.2. Manufacturing and Welding ................................................................................................. 61
8.3. Packaging ............................................................................................................................... 62
9 Appendix A Reference ....................................................................................................................... 64
10 Appendix B GPRS Coding Scheme ................................................................................................. 68
11 Appendix C GPRS Multi-slot Class .................................................................................................. 69
12 Appendix D EDGE Modulation and Coding Scheme ..................................................................... 70
EC25-A_User_Manual Confidential / Released 4 / 7
0
LTE Module
EC25-A User Manual
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 .................................................................................. 49
TABLE 25: GNSS FREQUENCY ............................................................................................................... 49
TABLE 26: ANTENNA REQUIREMENTS .................................................................................................. 50
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 ....................................................... 56
TABLE 32: RELATED DOCUMENTS ........................................................................................................ 64
TABLE 33: TERMS AND ABBREVIATIONS .............................................................................................. 64
TABLE 34: DESCRIPTION OF DIFFERENT CODING SCHEMES .......................................................... 68
TABLE 35: GPRS MULTI-SLOT CLASSES ............................................................................................... 69
TABLE 36: EDGE MODULATION AND CODING SCHEME ..................................................................... 70
EC25-A_User_Manual Confidential / Released 5 / 7
0
LTE Module
EC25-A 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) ........................................ 51
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 ............................................................................. 57
FIGURE 33: MODULE BOTTOM DIMENSIONS (BOTTOM VIEW) ......................................................... 58
FIGURE 34: RECOMMENDED FOOTPRINT (TOP VIEW) ...................................................................... 59
FIGURE 35: TOP VIEW OF THE MODULE .............................................................................................. 60
FIGURE 36: BOTTOM VIEW OF THE MODULE ...................................................................................... 60
FIGURE 37: LIQUIDS TEMPERATURE .................................................................................................... 62
FIGURE 38: CARRIER TAPE .................................................................................................................... 63
EC25-A_User_Manual Confidential / Released 6 / 7
0
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) 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-A 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.
EC25-A_User_Manual Confidential / Released 7 / 7
0
LTE Module
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.
EC25-A User Manual
EC25-A_User_Manual Confidential / Released 8 / 7
0
LTE Module
1.
1)
GNSS function is optional.
2.
2)
EC25 series (EC25-E/EC25-A/EC25-V/EC25-AUT) includes Data-only and Telematics versions.
Data-only version does not support voice function, while Telematics version supports it.
EC25-A User Manual
2 Product Concept
2.1. General Description
EC25 is a series of FDD-LTE /TDD-LTE /WCDMA/TD-SCDMA/CDMA/GSM wireless communication
module with receive diversity, which provides data connectivity on FDD-LTE, TDD-LTE, DC-HSPA+,
HSPA+, HSDPA, HSUPA, WCDMA, TD-SCDMA, CDMA, EDGE and GPRS networks. It can also provide
GNSS1) and voice functionality2) for your specific application. 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-A Frequency Bands
NOTES
FDD-LTE
(with Rx-diversity)
TDD-LTE
(with Rx-diversity)
WCDMA
(with Rx-diversity)
GSM Not supported
GNSS
EC25-A
B2/B4/B12
Not supported
B2/B5
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
EC25-A_User_Manual Confidential / Released 9 / 7
0
LTE Module
Feature
Details
Power Supply
Supply voltage: 3.3V~4.3V Typical supply voltage: 3.8V
Transmitting Power
Class 3 (24dBm+1/-3dB) for WCDMA bands
Class 3 (23dBm±2dB) for LTE FDD bands
Class 3 (23dBm±2dB) for LTE TDD bands
LTE Features
Support up to non-CA CAT4
Support 1.4 to 20MHz RF bandwidth
Support Multiuser MIMO in DL direction
FDD: Max 50Mbps (UL), 150Mbps (DL)
TDD: Max 35Mbps (UL), 130Mbps (DL)
WCDMA Features
Support 3GPP R8 DC-HSPA+
Support 16-QAM, 64-QAM and QPSK modulation
3GPP R6 CAT6 HSUPA: Max 5.76Mbps (UL)
3GPP R8 CAT24 DC-HSPA+: Max 42Mbps (DL)
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
EC25-A User Manual
80 LCC signal pads and 64 other pads.
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.
The outside of final products that contains this module device must display a label
referring to the enclosed module. This exterior label can use wording such as the
following:“Contains Transmitter Module FCC ID: XMR201605EC25A” Any similar wording that expresses the
same meaning may be used.
2.3. Key Features
The following table describes the detailed features of EC25 module.
Table 2: EC25 Key Features
EC25-A_User_Manual Confidential / Released 10 / 7
0
LTE Module
SMS cell broadcast
SMS storage: ME by default
USIM Interface
Support USIM/SIM card: 1.8V, 3.0V
Audio Features
Support one digital audio interface: PCM interface
WCDMA: AMR/AMR-WB
LTE: AMR/AMR-WB
Support echo cancellation and noise suppression
PCM 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
Support master and slave mode, but must be the master in long frame sync
USB Interface
UART Interface
Rx-diversity
Support LTE/WCDMA Rx-diversity
GNSS Features
Gen8C-Lite of Qualcomm
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
Storage temperature: -45°C ~ +90°C
Firmware Upgrade
USB interface
RoHS
EC25-A User Manual
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
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
All hardware components are fully compliant with EU RoHS directive
EC25-A_User_Manual Confidential / Released 11 / 7
0
LTE Module
EC25-A 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
ANT_MAIN ANT_DIVANT_GNSS
VBAT_RF
VBAT_BB
PWRKEY
RESET_N
ADCs
APT
PMIC
Tx
Control
PA
Switch
Duplex
PRx DRx
SAW
LNA
Transceiver
IQ Control
Baseband
Switch
SAW
NAND
DDR2
SDRAM
STATUS
VDD_EXT USB USIM PCM
19.2M
XO
UARTI2C
Figure 1: Functional Diagram
EC25-A_User_Manual Confidential / Released 12 / 7
GPIOs
0
LTE Module
EC25-A 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.
EC25-A_User_Manual Confidential / Released 13 / 7
0
LTE Module
EC25-A 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.
EC25-A_User_Manual Confidential / Released 14 / 7
0
LTE Module
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.
EC25-A User Manual
WAKEUP_IN
AP_READY
RESERVED
W_DISABLE#
NET_MODE
NET_STATUS
VDD_EXT
RESERVED
RESERVED
GND
GND
USIM_GND
DBG_RXD
DBG_TXD
USIM_PRESENCE
USIM_VDD
USIM_DATA
USIM_CLK
USIM_RST
RESERVED
1
2
4
5
6
7
141
142
10
11
12
13
14
15
16
17
18
RESERVED
RESERVED
USB_VBUS
USB_DM
USB_DP
GND
114
113
7271706968676665646362616059585756
117
129
118
119
120
121
122
123
124
125
126
127
128
108
109
110
111
112
115
20212223242526272829303132
19
130
131
132
133
134
8
9
135
136
137
138
139
140
116
103
104
105
106
107
RXD
TXD
DTR
99
100
82
83
84
101
102
79
80
81
RTS
CTS
76
77
78
DCD
95
96
73
74
75
97
98
RI
VBAT_BB
STATUS
90
91
92
93
94
VBAT_BB
VBAT_RF
85
86
87
88
89
33
VBAT_RF
GND
34335
RESERVED
55
144
143
36
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
GND
GND
GND
GND
GND
ANT_MAIN
GND
RESERVED
RESERVED
ANT_GNSS
GND
ADC0
ADC1
RESERVED
I2C_SDA
I2C_SCL
RESERVED
RESERVED
RESERVED
RESERVED
NOTES
RESERVED
Power Pins
GND
PWRKEY
PCM_IN※PCM_OUT※PCM_SYNC
RESERVED
GND
GND Pins
PCM_CLK※RESERVED
※
RESET_N
RESERVED
Figure 2: Pin Assignment (Top View)
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
GND
ANT_DIV
Signal Pins RESERVED Pins
EC25-A_User_Manual Confidential / Released 15 / 7
0
LTE Module
Type
Description
IO
Bidirectional input/output
DI
Digital input
DO
PI
PO
AI
AO
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,
EC25-A User Manual
3.3. Pin Description
The following tables show the EC25’s pin definition.
Table 3: IO Parameters Definition
Digital output
Power input
Table 4: Pin Description
Power output
Analog input
Analog output
EC25-A_User_Manual Confidential / Released 16 / 7
Ground.
0
LTE Module
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.
DC Characteristics
STATUS
61
The drive current
should be less than
0.9mA.
NET_MODE
5
VOHmin=1.35V
VOLmax=0.45V
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
For 1.8V USIM:
Vmax=1.9V
Vmin=1.7V
EC25-A User Manual
I/O Description
Indicate the module
OD
operating status.
Indicate the module
DO
network registration
mode.
Comment
Require external
pull-up. If unused,
keep it open.
1.8V power domain.
If unused, keep it
open.
EC25-A_User_Manual Confidential / Released 17 / 7
Power supply for
PO
USIM card.
Either 1.8V or 3V is
supported by the
module automatically.
0
LTE Module
For 3.0V USIM:
Vmax=3.05V
Vmin=2.7V
IOmax=50mA
USIM_DATA
15
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
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
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
DCD
63
VOLmax=0.45V
VOHmin=1.35V
EC25-A User Manual
Data signal of USIM
IO
card.
Clock signal of USIM
DO
card.
EC25-A_User_Manual Confidential / Released 18 / 7
DO
Data carrier
detection.
1.8V power domain.
If unused, keep it
open.
0
LTE Module
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
VOLmax=0.45V
VOHmin=1.35V
RXD
68
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
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
EC25-A User Manual
1.8V power domain.
DO Transmit data.
If unused, keep it
open.
DI Receive data.
1.8V power domain.
If unused, keep it
open.
EC25-A_User_Manual Confidential / Released 19 / 7
0
LTE Module
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
VOLmax=0.45V
VOHmin=1.35V
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
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.
DC Characteristics
EC25-A User Manual
1.8V power domain.
In master mode, it is
an output signal. In
IO PCM clock.
slave mode, it is an
input signal.
If unused, keep it
open.
EC25-A_User_Manual Confidential / Released 20 / 7
I/O Description
Comment
0
LTE Module
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
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
RESERVED Pins
Pin Name
Pin No.
DC Characteristics
RESERVED
3, 18, 23,
28~34,
37~40, 43,
55, 73~84,
113~144
Reserved.
Keep these pins
unconnected.
Mode
Details
Normal
Operation
Idle
Software is active. The module has registered to the network, and it 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
Functionality
Mode
AT+CFUN command can set the module entering into a minimum functionality mode
without removing the power supply. In this case, both RF function and USIM card will be
invalid.
Airplane
Mode
AT+CFUN command or W_DISABLE# pin can set the module entering into airplane
mode. In this case, RF function will be invalid.
EC25-A User Manual
Application
DI
processor sleep
state detection.
I/O Description
1.8V power domain.
If unused, keep it
open.
Comment
3.4. Operating Modes
The table below briefly summarizes the various operating modes referred in the following chapters.
Table 5: Overview of Operating Modes
EC25-A_User_Manual Confidential / Released 21 / 7
0
LTE Module
Sleep Mode
In this mode, the current consumption of the module will be reduced to the minimal level.
During this mode, the module can still receive paging message, SMS, voice call and
TCP/UDP data from the network normally.
Power Down
Mode
In this mode, the power management unit shuts down the power supply. Software is not
active. The serial interface is not accessible. Operating voltage (connected to VBAT_RF
and VBAT_BB) remains applied.
EC25-A User Manual
3.5. Power Saving
3.5.1. Sleep Mode
EC25 is able to reduce its current consumption to a minimum value during the sleep mode. The following
section describes EC25’s power saving procedure.
3.5.1.1. UART Application
If host communicates with module via UART interface, the following preconditions can let the module
enter into the sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.
Drive DTR to high level.
The following figure shows the connection between the module and the host.
Module
RXD
TXD
RI
DTR
AP_READY
GND
Host
TXD
RXD
EINT
GPIO
GPIO
GND
Figure 3: UART Sleep Application
Driving host DTR to low level will wake up the module.
When EC25 has URC to report, RI signal will wake up the host. Refer to Chapter 3.16 for details
about RI behavior.
AP_READY will detect the sleep state of host (can be configured to high level or low level detection).
EC25-A_User_Manual Confidential / Released 22 / 7
0
LTE Module
EC25-A User Manual
Refer to AT command AT+QCFG=“apready” for details.
3.5.1.2. USB Application with USB Remote Wakeup Function
If host supports USB suspend/resume and remote wakeup function, the following part will show the sleep
application.
There are three preconditions to let the module enter into the sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.
Ensure the DTR is held in high level or keep it open.
The host’s USB bus, which is connected with the module’s USB interface, enters into suspended
state.
The following figure shows the connection between the module and the host.
Module
USB_VBUS
USB_DP
USB_DM
AP_READY
GND
Host
VDD
USB_DP
USB_DM
GPIO
GND
Figure 4: Sleep Application with USB Remote Wakeup
Sending data to EC25 through USB will wake up the module.
When EC25 has URC to report, the module will send remote wake-up signals to USB BUS so as to
wake up the host.
3.5.1.3. USB Application with USB Suspend/Resume and RI Function
If host supports USB suspend/resume, but does not support remote wake-up function, the RI signal is
needed to wake up the host. The following part will show the sleep application.
There are three preconditions to let the module enter into the sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.
Ensure the DTR is held in high level or keep it open.
The host’s USB bus, which is connected with the module’s USB interface, enters into suspended
EC25-A_User_Manual Confidential / Released 23 / 7
0
LTE Module
EC25-A User Manual
state.
The following figure shows the connection between the module and the host.
Module Host
USB_VBUS
VDD
USB_DP
USB_DM
AP_READY
RI
GND
USB_DP
USB_DM
GPIO
EINT
GND
Figure 5: Sleep Application with RI
Sending data to EC25 through USB will wake up the module.
When EC25 has URC to report, RI signal will wake up the host.
3.5.1.4. USB Application without USB Suspend Function
If host does not support USB suspend function, you should disconnect USB_VBUS with additional control
circuit to let the module enter into sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.
Ensure the DTR is held in high level or keep it open.
Disconnect USB_VBUS.
The following figure shows the connection between the module and the host.
Module Host
GPIO
USB_VBUS
USB_DP
USB_DM
RI EINT
AP_READY
GND
Power
Switch
VDD
USB_DP
USB_DM
GPIO
GND
Figure 6: Sleep Application without Suspend Function
EC25-A_User_Manual Confidential / Released 24 / 7
0
LTE Module
You should pay attention to the level match shown in dotted line between module and host. Refer to
document [1] for more details about EC25 power management application.
1. The W_DISABLE# control function is disabled in firmware by default. It can be enabled by AT
command AT+QCFG=“airplanecontrol”. Refer to document [2] for details.
2. The execution of AT+CFUN command will not affect GNSS function.
EC25-A User Manual
Opening power switch to supply power to USB_VBUS will wake up the module.
NOTE
3.5.2. Airplane Mode
When the module enters into airplane mode, the RF function does not work, and all AT commands
correlative with RF function will be inaccessible. This mode can be set with the following ways.
Hardware:
The W_DISABLE# pin is pulled up by default; driving it to low level will let the module enter into airplane
mode.
Software:
Command AT+CFUN provides the choice of the functionality level <fun>=0, 1, 4.
AT+CFUN=0: Minimum functionality mode; both USIM and RF function are disabled.
AT+CFUN=1: Full functionality mode (by default).
AT+CFUN=4: Airplane mode. RF function is disabled.
NOTES
3.6. Power Supply
3.6.1. Power Supply Pins
EC25 provides four VBAT pins dedicated to connect with the external power supply. There are two
separate voltage domains for VBAT.
VBAT_RF with two pins for module RF part.
VBAT_BB with two pins for module baseband part.
The following table shows the VBAT pins and ground pins.
EC25-A_User_Manual Confidential / Released 25 / 7
0
LTE Module
Pin Name
Pin No.
Description
Min.
Typ.
Max.
Unit
VBAT_RF
57, 58
Power supply for module RF
part.
3.3
3.8
4.3 V VBAT_BB
59, 60
Power supply for module
baseband part.
3.3
3.8
4.3
V
GND
8, 9, 19, 22, 36,
46, 48, 50~54,
56, 72, 85~112
Ground.
- 0 -
V
EC25-A User Manual
Table 6: VBAT and GND Pins
3.6.2. Decrease Voltage Drop
The power supply range of the module is from 3.3V to 4.3V. Make sure the input voltage will never drop
below 3.3V. The following figure shows the voltage drop during transmitting burst in 2G network. The
voltage drop will be less in 3G and 4G networks.
Transmit
burst
VBAT
Drop
Min.3.3V
Transmit
burst
Ripple
Figure 7: Power Supply Limits during Transmit Burst
To decrease voltage drop, a bypass capacitor of about 100µF with low ESR should be used. Multi-layer
ceramic chip (MLCC) capacitor can provide the best combination of low ESR. The main power supply
from an external application has to be a single voltage source and expanded to two sub paths with star
structure. The width of VBAT_BB trace should be no less than 1mm; and the width of VBAT_RF trace
should be no less than 2mm. In principle, the longer the VBAT trace is, the wider it will be.
Three ceramic capacitors (100nF, 33pF, 10pF) are recommended to be applied to the VBAT pins. The
capacitors should be placed close to the VBAT pins. In addition, in order to get a stable power source, it is
suggested that you should use a zener diode of which reverse zener voltage is 5.1V and dissipation
power is more than 0.5W. The following figure shows the star structure of the power supply.
EC25-A_User_Manual Confidential / Released 26 / 7
0
VBAT
D1
5.1V
C1
100uF
LTE Module
EC25-A User Manual
VBAT_RF
VBAT_BB
+
C2
100nF
33pF
C3
C4
10pF
C5
100uF
+
C6
100nFC733pFC810pF
Module
Figure 8: Star Structure of the Power Supply
3.6.3. Reference Design for Power Supply
The power design for the module is very important, as the performance of the module largely depends on
the power source. The power supply is capable of providing sufficient current up to 2A at least. If the
voltage drop between the input and output is not too high, it is suggested that you should use a LDO to
supply power for module. If there is a big voltage difference between the input source and the desired
output (VBAT), a buck converter is preferred to be used as a power supply.
The following figure shows a reference design for +5V input power source. The designed output for the
power supply is about 3.8V and the maximum load current is 3A.
MIC29302WU
DC_IN
470uF
100nF
VBAT_EN
51K
2 4
IN OUT
EN
1
4.7K
47K
GND
3
5
ADJ
100K
1%
47K
1%
470R
470uF
VBAT
100nF
Figure 9: Reference Circuit of Power Supply
EC25-A_User_Manual Confidential / Released 27 / 7
0
LTE Module
Pin Name
Pin No.
DC Characteristics
PWRKEY
21
VIHmax=2.1V
VIHmin=1.3V
VILmax=0.5V
EC25-A User Manual
3.6.4. Monitor the Power Supply
You can use the AT+CBC command to monitor the VBAT_BB voltage value. For more details, please
refer to document [2].
3.7. Turn on and off Scenarios
3.7.1. Turn on Module Using the PWRKEY
The following table shows the pin definition of PWRKEY.
Table 7: PWRKEY Pin Description
Description
Turn on/off the module.
When EC25 is in power down mode, it can be turned on to normal mode by driving the PWRKEY pin to a
low level for at least 100ms. It is recommended to use an open drain/collector driver to control the
PWRKEY. After STATUS pin (require external pull-up) outputting a low level, PWRKEY pin can be
released. A simple reference circuit is illustrated in the following figure.
≥ 100ms
4.7K
Turn on pulse
Comment
PWRKEY
The other way to control the PWRKEY is using a button directly. A TVS component is indispensable to be
placed nearby the button for ESD protection. When pressing the key, electrostatic strike may generate
from finger. A reference circuit is shown in the following figure.
EC25-A_User_Manual Confidential / Released 28 / 7
47K
Figure 10: Turn on the Module Using Driving Circuit
0
S1
Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is no less than
30ms.
TVS
Close to S1
Figure 11: Turn on the Module Using Keystroke
The turn on scenario is illustrated in the following figure.
LTE Module
EC25-A User Manual
PWRKEY
VBAT
PWRKEY
RESET_N
STATUS
(OD)
NOTE
≥ 100ms
V
≤ 0.5V
IL
Inactive
Inactive
TBD
V
≥ 1.3V
IH
TBD
TBD
ActiveUART
ActiveUSB
Figure 12: Timing of Turning on Module
NOTE
EC25-A_User_Manual Confidential / Released 29 / 7
0
LTE Module
EC25-A User Manual
3.7.2. Turn off Module
The following procedures can be used to turn off the module:
Normal power down procedure: Turn off the module using the PWRKEY pin.
Normal power down procedure: Turn off the module using command AT+QPOWD.
3.7.2.1. Turn off Module Using the PWRKEY Pin
Driving the PWRKEY to a low level voltage, the module will execute power-down procedure after the
PWRKEY is released. The power-down scenario is illustrated in the following figure.
VBAT
TBDTBD
PWRKEY
STATUS
(OD)
Module
Status
RUNNING
Power-down procedure
OFF
Figure 13: Timing of Turning off Module
3.7.2.2. Turn off Module Using AT Command
It is also a safe way to use AT command AT+QPOWD to turn off the module, which is similar to turning off
the module via PWRKEY Pin.
Please refer to document [2] for details about the AT command of AT+QPOWD.
3.8. Reset the Module
The RESET_N can be used to reset the module. You can reset the module by driving the RESET_N to a
low level voltage for time between Treset_min and Treset_max.
EC25-A_User_Manual Confidential / Released 30 / 7
0
LTE Module
Pin Name
Pin No.
Description
DC Characteristics
Comment
RESET_N
20
Reset the module.
VIHmax=2.1V
VIHmin=1.3V
VILmax=0.5V
EC25-A User Manual
Table 8: RESET_N Pin Description
The recommended circuit is similar to the PWRKEY control circuit. You can use an open drain/collector
driver or button to control the RESET_N.
RESET_N
TBD
Reset pulse
4.7K
47K
Figure 14: Reference Circuit of RESET_N by Using Driving Circuit
S2
RESET_N
TVS
Close to S2
The reset scenario is illustrated in the following figure.
EC25-A_User_Manual Confidential / Released 31 / 7
Figure 15: Reference Circuit of RESET_N by Using Button
0
VBAT
1. Use the RESET_N only when turning off the module by the command AT+QPOWD and the
PWRKEY pin failed.
2. Ensure that there is no large capacitance on the PWRKEY and RESET_N pins.
Pin Name
Pin No.
I/O
Description
Comment
USIM_VDD
14
PO
Power supply for USIM card.
Either 1.8V or 3.0V is supported
by the module automatically.
USIM_DATA
15
IO
Data signal of USIM card.
USIM_CLK
16
DO
Clock signal of USIM card.
USIM_RST
17
DO
Reset signal of USIM card.
USIM_
PRESENCE
13
DI
USIM card insertion detection.
USIM_GND
10
LTE Module
EC25-A User Manual
≤Treset_max
≥Treset_min
RESET_N
Module
Status
NOTES
RUNNING
Figure 16: Timing of Resetting Module
3.9. USIM Card Interface
VIL ≤ 0.5V
RESETTING
VIH ≥ 1.3V
RUNNING
The USIM card interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and
3.0V USIM cards are supported.
Table 9: Pin Definition of the USIM Interface
Specified ground for USIM card.
EC25-A_User_Manual Confidential / Released 32 / 7
0
LTE Module
EC25-A User Manual
EC25 supports USIM card hot-plug via the USIM_PRESENCE pin. It supports low level and high level
detections, which is disabled by default. For details, refer to document [2] about the command
AT+QSIMDET.
The following figure shows the reference design of the 8-pin USIM connector.
Module
VDD_EXT
51K
USIM_GND
USIM_VDD
USIM_RST
USIM_CLK
USIM_PRESENCE
USIM_DATA
USIM_VDD
15K
22R
22R
22R
33pF 33pF 33pF
GND
100nF USIM Connector
VCC
RST
CLK
GND
GND
VPP
IO
GND
Figure 17: Reference Circuit of 8-Pin USIM Connector
If you do not need the USIM card detection function, keep USIM_PRESENCE unconnected. The
reference circuit for using a 6-pin USIM card connector is illustrated in the following figure.
USIM_VDD
Module
USIM_GND
USIM_VDD
USIM_RST
USIM_CLK
USIM_DATA
15K
22R
22R
22R
33pF 33pF 33pF
GND
100nF
GND
USIM Connector
VCC
RST
CLK IO
GND
VPP
Figure 18: Reference Circuit of 6-Pin USIM Connector
In order to enhance the reliability and availability of the USIM card in your application, please follow the
EC25-A_User_Manual Confidential / Released 33 / 7
0
LTE Module
Pin Name
Pin No.
I/O
Description
Comment
USB_DP
69
IO
USB differential data bus (positive).
Require differential
impedance of 90Ω.
USB_DM
70
IO
USB differential data bus (minus).
Require differential
impedance of 90Ω.
USB_VBUS
71
PI
Used for detecting the USB
connection.
Typical 5.0V
GND
72
Ground
EC25-A User Manual
criteria below in the USIM circuit design:
Keep layout of USIM card as close as possible to the module. Assure the length of trace is less than
200mm.
Keep USIM card signal away from RF and VBAT alignment.
Assure the ground between the module and the USIM connector short and wide. Keep the width of
ground and USIM_VDD no less than 0.5mm to maintain the same electric potential.
To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away with each other and
shield them with surrounded ground.
In order to offer good ESD protection, it is recommended to add TVS which parasitic capacitance
should not be more than 50pF. The 22ohm resistors should be added in series between the module
and the USIM card so as to suppress the EMI spurious transmission and enhance the ESD
protection. The 33pF capacitors are used for filtering interference of GSM900. Please note that the
USIM peripheral circuit should be close to the USIM connector.
The pull-up resistor on USIM_DATA line can improve anti-jamming capability when long layout trace
and sensitive occasion are applied, and should be placed close to the USIM connector.
3.10. USB Interface
EC25 contains one integrated Universal Serial Bus (USB) transceiver which complies with the USB 2.0
specification and supports high-speed (480Mbps) and full-speed (12Mbps) modes. The USB interface is
used for AT command, data transmission, GNSS NMEA sentences output, software debug and firmware
upgrade. The following table shows the pin definition of USB interface.
Table 10: USB Pin Description
More details about the USB 2.0 specifications, please visit http://www.usb.org/home.
The USB interface is recommended to be reserved for firmware upgrade in your design. The following
figure shows the reference circuit of USB interface.
EC25-A_User_Manual Confidential / Released 34 / 7
0
Minimize this stub
EC25 module can only be used as a slave device.
LTE Module
EC25-A User Manual
Test Points
Module
USB_VBUS
USB_DM
USB_DP
GND
VDD
R3
R4
R1
R2
NM_0R
NM_0R
Close to Module
ESD Array
0R
0R
MCU
USB_DM
USB_DP
GND
Figure 19: Reference Circuit of USB Application
In order to meet USB data line signal integrity, components R1, R2, R3 and R4 must be placed close to
the module, and then these resistors should be placed close to each other. The extra stubs of trace must
be as short as possible.
In order to ensure the USB interface design corresponding with the USB 2.0 specification, please comply
with the following principles.
It is important to route the USB signal traces as differential pairs with total grounding. The impedance
of USB differential trace is 90ohm.
Do not route signal traces under crystals, oscillators, magnetic devices and RF signal traces. It is
important to route the USB differential traces in inner-layer with ground shielding on not only upper
and lower layers but also right and left sides.
Pay attention to the influence of junction capacitance of ESD component on USB data lines. Typically,
the capacitance value should be less than 2pF.
Keep the ESD components as close as possible to the USB connector.
NOTE
EC25-A_User_Manual Confidential / Released 35 / 7
0
LTE Module
Pin Name
Pin No.
RI
62
DCD
63
CTS
64
DO
Clear to send
1.8V power domain
RTS
65
DI
Request to send
1.8V power domain
DTR
66
DI
Sleep mode control
1.8V power domain
TXD
67
DO
Transmit data
1.8V power domain
RXD
68
DI
Receive data
1.8V power domain
Pin Name
Pin No.
I/O
Description
Comment
DBG_TXD
12
DO
Transmit data
1.8V power domain
DBG_RXD
11
DI
Receive data
1.8V power domain
EC25-A User Manual
3.11. UART Interface
The module provides two UART interfaces: main UART interface and debug UART interface. The
following shows the different features.
Main UART interface supports 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600bps
baud rate, and the default is 115200bps. This interface can be used for data transmission and AT
communication.
Debug UART interface supports 115200bps baud rate. It can be used for Linux console and log
output.
The following tables show the pin definition.
Table 11: Pin Definition of the Main UART Interface
I/O Description Comment
DO Ring indicator 1.8V power domain
DO Data carrier detection 1.8V power domain
Table 12: Pin Definition of the Debug UART Interface
The logic levels are described in the following table.
EC25-A_User_Manual Confidential / Released 36 / 7
0
LTE Module
Parameter
Min.
Max.
Unit
VIL
-0.3
0.6
V
VIH
1.2
2.0
V
VOL 0 0.45
V
VOH
1.35
1.8
V
EC25-A User Manual
Table 13: Logic Levels of Digital I/O
The module provides 1.8V UART interface. A level translator should be used if your application is
equipped with a 3.3V UART interface. A level translator TXS0108EPWR provided by Texas Instrument is
recommended. The following figure shows the reference design.
VDD_EXT
RI
DCD
CTS
RTS
DTR
TXD
RXD
0.1uF
51K
VCCA VCCB
OE
A1
A2
A3
A4
A5
A6
A7
A8
Translator
GND
B1
B2
B3
B4
B5
B6
B7
B8
0.1uF
51K
VDD_MCU
RI_MCU
DCD_MCU
CTS_MCU
RTS_MCU
DTR_MCU
TXD_MCU
RXD_MCU
Figure 20: Reference Circuit with Translator Chip
Please visit http://www.ti.com for more information.
Another example with transistor translation circuit is shown as below. The circuit of dotted line can refer to
the circuit of solid line. Please pay attention to the direction of connection. Input dotted line of the module
should refer to input solid line of the module. Output dotted line of the module should refer to output solid
line of the module.
EC25-A_User_Manual Confidential / Released 37 / 7
0
LTE Module
Transistor circuit solution is not suitable for high baud rates exceeding 460Kbps.
EC25-A User Manual
MCU/ARM
/TXD
/RXD
GPIO
GPIO DCD
Figure 21: Reference Circuit with Transistor Circuit
/RTS
/CTS
EINT
GND
VDD_EXT
10K
VCC_MCU
4.7K
1nF
1nF
4.7K
VDD_EXT
10K
VDD_EXT
Module
RXD
TXD
RTS
CTS
DTR
RI
GND
NOTE
3.12. PCM and I2C Interface
EC25 provides one Pulse Code Modulation (PCM) digital interface for audio design, which supports the
following modes:
Primary mode (short sync, works as both master and slave)
Auxiliary mode (long sync, works as master only)
In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; the PCM_SYNC falling edge represents the MSB. In this mode, PCM_CLK supports 128, 256, 512,
1024 and 2048kHz for different speech codecs.
In auxiliary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; while the PCM_SYNC rising edge represents the MSB. In this mode, PCM interface operates with a
128kHz PCM_CLK and an 8kHz, 50% duty cycle PCM_SYNC only.
EC25 supports 8-bit A-law and μ-law, and also 16-bit linear data formats. The following figures show the
primary mode’s timing relationship with 8kHz PCM_SYNC and 2048kHz PCM_CLK, as well as auxiliary
mode’s timing relationship with 8kHz PCM_SYNC and 128kHz PCM_CLK.
EC25-A_User_Manual Confidential / Released 38 / 7
0
LTE Module
Pin Name
Pin No.
I/O
Description
Comment
PCM_IN
24
EC25-A User Manual
125us
PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
1 2 256255
MSB
LSB
LSBMSB
MSB
MSB
Figure 22: Primary Mode Timing
125us
PCM_CLK
1 2 1615
PCM_SYNC
MSB
PCM_OUT
MSB
PCM_IN
LSB
LSB
Figure 23: Auxiliary Mode Timing
The following table shows the pin definition of PCM and I2C interface which can be applied on audio
codec design.
Table 14: Pin Definition of PCM and I2C Interface
DI PCM data input 1.8V power domain
EC25-A_User_Manual Confidential / Released 39 / 7
0
LTE Module
PCM_OUT
25
DO
PCM data output
1.8V power domain
PCM_SYNC
26
IO
PCM data frame sync signal
1.8V power domain
PCM_CLK
27
IO
PCM data bit clock
1.8V power domain
I2C_SCL
41
OD
I2C serial clock
Require external pull-up to 1.8V
I2C_SDA
42
OD
I2C serial data
Require external pull-up to 1.8V
1. It is recommended to reserve RC (R=22ohm, C=22pF) circuit on the PCM lines, especially for
PCM_CLK.
2. EC25 works as a master device pertaining to I2C interface.
EC25-A User Manual
Clock and mode can be configured by AT command, and the default configuration is master mode using
short sync data format with 2048kHz PCM_CLK and 8kHz PCM_SYNC. Refer to document [2] about the
command AT+QDAI for details.
The following figure shows the reference design of PCM interface with external codec IC.
NOTES
MICBIAS
PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
I2C_SCL
I2C_SDA
Module
1.8V
4.7K
BCLK
LRCK
DAC
ADC
SCL
SDA
Codec
4.7K
INP
INN
LOUTP
LOUTN
Figure 24: Reference Circuit of PCM Application with Audio Codec
BIAS
EC25-A_User_Manual Confidential / Released 40 / 7
0
LTE Module
Pin Name
Pin No.
ADC0
45
ADC1
44
Parameter
Min.
Typ.
Max.
Unit
ADC0 Voltage Range
0.3 VBAT_BB
V
ADC1 Voltage Range
0.3
VBAT_BB
V
ADC Resolution
15 bits
Pin Name
Pin No.
NET_MODE
5
DO
Indicate the module network registration
1.8V power domain
EC25-A User Manual
3.13. ADC Function
The module provides two analog-to-digital converters (ADC). Using AT command AT+QADC=0 can read
the voltage value on ADC0 pin. Using AT command AT+QADC=1 can read the voltage value on ADC1
pin. For more details of these AT commands, please refer to document [2].
In order to improve the accuracy of ADC, the trace of ADC should be surrounded by ground.
Table 15: Pin Definition of the ADC
Description
General purpose analog to digital converter
General purpose analog to digital converter
The following table describes the characteristic of the ADC function.
Table 16: Characteristic of the ADC
3.14. Network Status Indication
The network indication pins can be used to drive a network status indicator LED. The module provides
two pins which are NET_MODE and NET_STATUS. The following tables describe pin definition and logic
level changes in different network status.
Table 17: Pin Definition of Network Indicator
EC25-A_User_Manual Confidential / Released 41 / 7
I/O Description Comment
0
LTE Module
mode.
NET_STATUS
6
DO
Indicate the module network activity
status.
1.8V power domain
Pin Name
Status
Description
NET_MODE
Always High
Registered in LTE network
Always Low
Others
NET_STATUS
Flicker slowly (200ms High/1800ms Low)
Flicker slowly (1800ms High/200ms Low)
Flicker quickly (125ms High/125ms Low)
Always High
EC25-A User Manual
Table 18: Working State of the Network Indicator
Network searching
Idle
A reference circuit is shown in the following figure.
Module
Network
Indicator
Figure 25: Reference Circuit of the Network Indicator
Data transfer is ongoing
Voice calling
VBAT
2.2K
4.7K
47K
3.15. STATUS
The STATUS pin is an open drain output for indicating the module’s operation status. You can connect it
to a GPIO of DTE with pulled up, or as LED indication circuit as below. When the module is turned on
normally, the STATUS will present the low state. Otherwise, the STATUS will present high-impedance
state.
EC25-A_User_Manual Confidential / Released 42 / 7
0
LTE Module
Pin Name
Pin No.
I/O
Description
Comment
STATUS
61
OD
Indicate the module operation status
Require external pull-up
URC can be output from UART port, USB AT port and USB modem port by command AT+QURCCFG.
The default port is USB AT port.
EC25-A User Manual
Table 19: Pin Definition of STATUS
The following figure shows different design circuit of STATUS, you can choose either one according to
your application demands.
VDD_MCU
10K
STATUS MCU_GPIO
Module
STATUS
Module
VBAT
2.2K
Figure 26: Reference Circuit of the STATUS
3.16. Behavior of the RI
You can use command AT+QCFG=“risignaltype”,“physical” to configure RI behavior.
No matter which port URC is presented on, URC will trigger the behavior on RI pin.
NOTE
In addition, RI behavior can be configured flexibly. The default behavior of the RI is shown as below.
EC25-A_User_Manual Confidential / Released 43 / 7
0
LTE Module
State
Response
Idle
RI keeps high level
URC
RI outputs 120ms low pulse when new URC returns
EC25-A User Manual
Table 20: Behavior of the RI
The RI behavior can be changed by command AT+QCFG=“urc/ri/ring”. Refer to document [2] for
details.
EC25-A_User_Manual Confidential / Released 44 / 7
0
LTE Module
Parameter
Description
Conditions
Typ.
Unit
Sensitivity
(GNSS)
Cold start
Autonomous
TBD
dBm
Reacquisition
Autonomous
TBD
dBm
Tracking
Autonomous
TBD
dBm
TTFF
(GNSS)
Cold start
@open sky
Autonomous
TBD
s
XTRA enabled
TBD
s
Warm start
@open sky
Autonomous
TBD
s
TBD
s
EC25-A User Manual
4 GNSS Receiver
4.1. General Description
EC25 includes a fully integrated global navigation satellite system solution that supports Gen8C-Lite of
Qualcomm (GPS, GLONASS, BeiDou, Galileo and QZSS).
EC25 supports standard NMEA-0183 protocol, and outputs NMEA sentences with 1Hz via USB interface
by default.
By default, EC25 GNSS engine is switched off. It has to be switched on with AT command. For more
details about GNSS engine technology and configurations, please refer to document [3].
4.2. GNSS Performance
The following table shows EC25 GNSS performance.
Table 21: GNSS Performance
XTRA enabled
EC25-A_User_Manual Confidential / Released 45 / 7
0
Hot start
@open sky
Autonomous
TBD
s
XTRA enabled
TBD
s
Accuracy
(GNSS)
CEP-50
Autonomous
@open sky
TBD
m
1. Tracking sensitivity: the lowest GPS signal value at the antenna port for which the module can keep
on positioning for 3 minutes.
2. Reacquisition sensitivity: the lowest GPS signal value at the antenna port for which the module can
fix position again within 3 minutes after loss of lock.
3. Cold start sensitivity: the lowest GPS signal value at the antenna port for which the module fixes
position within 3 minutes after executing cold start command.
NOTES
LTE Module
EC25-A User Manual
4.3. Layout Guideline
The following layout guideline should be taken into account in your design.
Maximize the distance between the GNSS antenna, the main antenna and the Rx-diversity antenna.
Digital circuits such as USIM card, USB interface, Camera module, Display connector and SD card
should be kept away from the antenna.
Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar
isolation and protection.
Keep 50ohm characteristic impedance for the ANT_GNSS trace.
Refer to Chapter 5 for GNSS reference design and antenna consideration.
EC25-A_User_Manual Confidential / Released 46 / 7
0
LTE Module
Pin Name
Pin No.
I/O
Description
Comment
ANT_MAIN
49
IO
Main antenna
50ohm impedance
ANT_DIV
35
AI
Receive diversity antenna
50ohm impedance
3GPP Band
Transmit
Receive
Unit
B2 (1900)
1850 ~ 1910
1930 ~ 1990
MHz
B5 (850)
824 ~ 849
869 ~ 894
MHz
MHz
EC25-A User Manual
5 Antenna Interface
EC25 antenna interface includes a main antenna, an Rx-diversity antenna which is used to resist the fall
of signals caused by high speed movement and multipath effect, and a GNSS antenna. The antenna
interface has an impedance of 50ohm.
5.1. Main/Rx-diversity Antenna Interface
5.1.1. Pin Definition
The main antenna and Rx-diversity antenna pins definition are shown below.
Table 22: Pin Definition of the RF Antenna
5.1.2. Operating Frequency
Table 23: The Module Operating Frequencies
B2 1850 ~ 1910 1930 ~ 1990 MHz
B4
B12 699 ~ 716 728 ~ 746
EC25-A_User_Manual Confidential / Released 47 / 7
1710 ~ 1755 2110 ~ 2155 MHz
0
LTE Module
1. Keep a proper distance between the main antenna and the Rx-diversity antenna to improve the
receiving sensitivity.
2. ANT_DIV function is enabled by default. Use the AT command AT+QCFG="diversity",0 can disable
receive diversity.
EC25-A User Manual
5.1.3. Reference Design
The reference design of ANT_MAIN and ANT_DIV antenna is shown as below. It should reserve a π-type
matching circuit for better RF performance. The capacitors are not mounted by default.
Module
ANT_MAIN
ANT_DIV
C1
NM
C3
NM
R1 0R
C2
NM
R2 0R
C4
NM
Main
antenna
Diversity
antenna
Figure 27: Reference Circuit of Antenna Interface
NOTES
5.2. GNSS Antenna Interface
The following tables show the GNSS antenna pin definition and frequency specification.
EC25-A_User_Manual Confidential / Released 48 / 7
0
Table 24: Pin Definition of GNSS Antenna
Pin Name
Pin No.
I/O
Description
Comment
ANT_GNSS
47
AI
GNSS antenna
50ohm impedance
Type
Frequency
Unit
GPS/Galileo/QZSS
1575.42 ± 1.023
MHz
GLONASS
BeiDou
1. You can choose an external LDO to supply power according to the active antenna.
2. If you design the module with passive antenna, the VDD circuit is not needed.
Table 25: GNSS Frequency
1597.5 ~ 1605.8 MHz
1561.098 ± 2.046 MHz
LTE Module
EC25-A User Manual
The reference design of GNSS antenna is shown as below.
VDD
GNSS
Antenna
10R
47nH
NM
0.1uF
100pF
Figure 28: Reference Circuit of GNSS Antenna
Module
ANT_GNSS
NM
NOTES
EC25-A_User_Manual Confidential / Released 49 / 7
0
LTE Module
Type
Requirements
GNSS
GSM/WCDMA/LTE
EC25-A User Manual
5.3. Antenna Installation
5.3.1. Antenna Requirement
The following table shows the requirements on main antenna, Rx-diversity antenna and GNSS antenna.
Table 26: Antenna Requirements
Frequency range: 1561 - 1615MHz
Polarization: RHCP or linear
VSWR: < 2 (Typ.)
Passive antenna gain: > 0dBi
Active antenna noise figure: < 1.5dB
Active antenna gain: > -2dBi
Active antenna embedded LNA gain: 20dB (Typ.)
Active antenna total gain: > 18dBi (Typ.)
VSWR: ≤ 2
Gain (dBi): 1
Max Input Power (W): 50
Input Impedance (ohm): 50
Polarization Type: Vertical
Cable Insertion Loss: < 1dB
(GSM900, WCDMA B5/B8,LTE B5/B8/B12/B13/B20/B28-A/B28-B)
Cable Insertion Loss: < 1.5dB
(GSM1800, WCDMA B1/B2/B4/,LTE B1/B2/B3/B4)
Cable insertion loss < 2dB
(LTE B7/B38/B40/B41)
5.3.2. Install the Antenna with RF Connector
The following figure is the antenna installation with RF connector provided by HIROSE. The
recommended RF connector is UF.L-R-SMT.
EC25-A_User_Manual Confidential / Released 50 / 7
0
LTE Module
EC25-A User Manual
Figure 29: Dimensions of the UF.L-R-SMT Connector (Unit: mm)
You can use U.FL-LP serial connector listed in the following figure to match the UF.L-R-SMT.
Figure 30: Mechanicals of UF.L-LP Connectors
EC25-A_User_Manual Confidential / Released 51 / 7
0
The following figure describes the space factor of mated connector.
LTE Module
EC25-A User Manual
Figure 31: Space Factor of Mated Connector (Unit: mm)
For more details, please visit http://www.hirose.com.
EC25-A_User_Manual Confidential / Released 52 / 7
0
LTE Module
Parameter
Max.
Unit
VBAT_RF/VBAT_BB
-0.3
4.7 V USB_VBUS
-0.3
5.5 V Peak Current of VBAT_BB
0
0.8 A Peak Current of VBAT_RF
0
1.8 A Voltage at Digital Pins
-0.3
2.3
V
Voltage at ADC0
0
VBAT_BB
V
Voltage at ADC1
0
VBAT_BB
V
Parameter
Description
Min.
Typ.
Max.
VBAT
VBAT_BB and
Voltage must stay within the
3.3
3.8
4.3
V
EC25-A User Manual
6 Electrical, Reliability and Radio
Characteristics
6.1. Absolute Maximum Ratings
Absolute maximum ratings for power supply and voltage on digital and analog pins of the module are
listed in the following table.
Table 27: Absolute Maximum Ratings
6.2. Power Supply Ratings
Min.
Table 28: The Module Power Supply Ratings
EC25-A_User_Manual Confidential / Released 53 / 7
Conditions
Unit
0
Parameter
Description
Conditions
Min.
Typ.
Max.
Unit
VBAT_RF
min/max values, including
voltage drop, ripple and
spikes.
Voltage drop during
transmitting burst
Maximum power control
level on GSM900.
400
mV
I
VBAT
Peak supply current
(during transmission
slot)
Maximum power control
level on GSM900.
1.8
2.0
A
USB_VBUS
USB detection
3.0
5.0
5.25
V
6.3. Operating Temperature
Parameter
Min.
Typ.
Max.
Unit
Normal Temperature
-35
25
75
ºC
Restricted Operation
-40 ~ -35
75 ~ 85
ºC
Storage Temperature
-45
90
ºC
LTE Module
EC25-A User Manual
The operating temperature is listed in the following table.
Table 29: Operating Temperature
6.4. Current Consumption
This information will be added in future version of this document.
6.5. RF Output Power
The following table shows the RF output power of EC25 module.
EC25-A_User_Manual Confidential / Released 54 / 7
0
Table 30: Conducted RF Output Power
Frequency
Max.
Min.
WCDMA B2/B5 22.5dBm±1dB <-50dBm
LTE Module
EC25-A User Manual
LTE FDD B2/B4/B12
22dBm±2dB <-44dBm
Directives and Standards
The EC25-A module is designed to comply with the FCC statements. FCC ID: XMR201605EC25A, The
Host system using EC25-A, should have label indicated "Contains FCC ID: XMR201605EC25A".
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 EC25-A must include RF exposure warning statement to advice
user should keep minimum 20cm from the radio antenna of EC25-A module depending on the Mobile status.
Note: If a portable device (such as PDA) uses EC25-A module, the device needs to do permissive
change and SAR testing.
EC25-A_User_Manual Confidential / Released 55 / 7
0
Table 31: Electrostatics Discharge Characteristics
Tested Points
Contact Discharge
Air Discharge
Unit
VBAT, GND
±5
±10
kV
All Antenna Interfaces
±4
±8
kV
Other Interfaces
±0.5
±1
kV
LTE Module
EC25-A User Manual
EC25-A_User_Manual Confidential / Released 56 / 7
0
LTE Module
EC25-A User Manual
7 Mechanical Dimensions
This chapter describes the mechanical dimensions of the module. All dimensions are measured in mm.
7.1. Mechanical Dimensions of the Module
(32+/-0.15)
2.4+/-0.2
(29+/-0.15)
0.8
Figure 32: Module Top and Side Dimensions
EC25-A_User_Manual Confidential / Released 57 / 7
0
32.0
LTE Module
EC25-A User Manual
29.0
Figure 33: Module Bottom Dimensions (Bottom View)
EC25-A_User_Manual Confidential / Released 58 / 7
0
7.2. Footprint of Recommendation
1. Pads 73~84 should not be designed.
2. In order to maintain the module, keep about 3mm between the module and other components in the
host PCB.
LTE Module
EC25-A User Manual
eepo
ut area
K
32.0
Figure 34: Recommended Footprint (Top View)
29.0
NOTES
EC25-A_User_Manual Confidential / Released 59 / 7
0
LTE Module
EC25-A User Manual
7.3. Top View of the Module
Figure 35: Top View of the Module
7.4. Bottom View of the Module
Figure 36: Bottom View of the Module
EC25-A_User_Manual Confidential / Released 60 / 7
0
LTE Module
As plastic container cannot be subjected to high temperature, the module needs to be taken out from the
container for high temperature (125ºC) baking. If shorter baking time is desired, please refer to
IPC/JEDECJ-STD-033 for baking procedure.
EC25-A User Manual
8 Storage and Manufacturing
8.1. Storage
EC25 is stored in a vacuum-sealed bag. The restrictions of storage condition are shown as below.
1. Shelf life in sealed bag is 12 months at < 40ºC/90%RH.
2. After this bag is opened, devices that will be subjected to reflow soldering or other high temperature
processes must be:
Mounted within 72 hours at factory conditions of ≤ 30ºC/60%RH.
Stored at <10% RH.
3. Devices require bake before mounting, if:
Humidity indicator card is >10% when ambient temperature is 23ºC±5ºC.
Mounted for more than 72 hours at factory conditions of ≤ 30ºC/60% RH.
4. If baking is required, devices may be baked for 48 hours at 125ºC±5ºC.
NOTE
8.2. Manufacturing and Welding
The squeegee should push the paste on the surface of stencil, so as to make the paste fill the stencil
openings and penetrate to the PCB. The force on the squeegee should be adjusted so as to produce a
clean stencil surface on a single pass. To ensure the module soldering quality, the thickness of stencil at
the hole of the module pads should be 0.18mm. For details, please refer to document [4].
It is suggested that the peak reflow temperature is 235 ~ 245ºC (for SnAg3.0Cu0.5 alloy). The absolute
max reflow temperature is 260ºC. To avoid damage to the module when it is repeatedly heated, it is
EC25-A_User_Manual Confidential / Released 61 / 7
0
LTE Module
EC25-A User Manual
suggested that the module should be mounted after the first panel has been reflowed. The following
picture is the actual diagram which we have operated.
ºC
250
217
200
150
100
Temperature
50
0
50
Preheat Heating Cooling
Liquids Temperature
160 ºC
Between 1~3 ºC/s
100
200 ºC
70s~120s
150 200
40s~60s
250 300
s
Time
Figure 37: Liquids Temperature
8.3. Packaging
EC25 is packaged in tap and reel carriers. One reel is 11.53m length and contains 250pcs modules. The
figure below shows the package details, measured in mm.
EC25-A_User_Manual Confidential / Released 62 / 7
0
LTE Module
EC25-A User Manual
±0.15
20.20
±0.3
44.00
±0.1
1.75
32.5
33.5
±0.15
±0.15
2.00
±0.1
44.00
±0.1
4.00
±0.1
32.5± 0.15
33.5± 0.15
1.50
0.1
±
±0.15
29.3
±0.15
30.3
0.35± 0.05
4.2
±0.15
3.1
±0.15
±0.15
30.3
48.5
100
44.5
+0
-0.00
.20
13
Figure 38: Carrier Tape
Cover tape
tion of feed
Direc
EC25-A_User_Manual Confidential / Released 63 / 7
0
9 Appendix A Reference
SN
Document Name
Remark
[1]
Quectel_EC25_Power_Management_Application_
Note
EC25 Power Management Application
Note
[2]
Quectel_EC25_AT_Commands_Manual
EC25 AT Commands Manual
[3]
Quectel_EC25_GNSS_AT_Commands_Manual
EC25 GNSS AT Commands Manual
[4]
Quectel_Module_Secondary_SMT_User_Guide
Module Secondary SMT User Guide
Abbreviation
Description
AMR
Adaptive Multi-rate
bps
Bits Per Second
CHAP
Challenge Handshake Authentication Protocol
CS
Coding Scheme
CSD
Circuit Switched Data
CTS
Clear To Send
DC-HSPA+
Dual-carrier High Speed Packet Access
DFOTA
Delta Firmware Upgrade Over The Air
DL
Downlink
DTR
Data Terminal Ready
DTX
Table 32: Related Documents
LTE Module
EC25-A User Manual
Table 33: Terms and Abbreviations
Discontinuous Transmission
EC25-A_User_Manual Confidential / Released 64 / 7
0
EFR
Enhanced Full Rate
ESD
Electrostatic Discharge
FDD
Frequency Division Duplex
FR
Full Rate
GLONASS
GLObalnaya NAvigatsionnaya Sputnikovaya Sistema, the Russian Global
Navigation Satellite System
GMSK
Gaussian Minimum Shift Keying
GNSS
Global Navigation Satellite System
GPS
Global Positioning System
GSM
HR
HSPA
HSDPA
HSUPA
High Speed Uplink Packet Access
I/O
Input/Output
Inorm
Normal Current
LED
Light Emitting Diode
LNA
Low Noise Amplifier
LTE
Long Term Evolution
MIMO
Multiple Input Multiple Output
MO
Mobile Originated
MS
Mobile Station (GSM engine)
MT
Mobile Terminated
PAP
Password Authentication Protocol
PCB
Printed Circuit Board
PDU
Global System for Mobile Communications
LTE Module
EC25-A User Manual
Half Rate
High Speed Packet Access
High Speed Downlink Packet Access
Protocol Data Unit
EC25-A_User_Manual Confidential / Released 65 / 7
0
PPP
Point-to-Point Protocol
QAM
Quadrature Amplitude Modulation
QPSK
Quadrature Phase Shift Keying
RF
Radio Frequency
RHCP
Right Hand Circularly Polarized
Rx
Receive
SIM
Subscriber Identification Module
SMS
Short Message Service
TDD
TDMA
TD-SCDMA
TX
UL
Uplink
UMTS
Universal Mobile Telecommunications System
URC
Unsolicited Result Code
USIM
Universal Subscriber Identity Module
Vmax
Maximum Voltage Value
Vnorm
Normal Voltage Value
Vmin
Minimum Voltage Value
VIHmax
Maximum Input High Level Voltage Value
VIHmin
Minimum Input High Level Voltage Value
VILmax
Maximum Input Low Level Voltage Value
VILmin
Minimum Input Low Level Voltage Value
VImax
Absolute Maximum Input Voltage Value
VImin
Time Division Duplexing
LTE Module
EC25-A User Manual
Time Division Multiple Access
Time Division-Synchronous Code Division Multiple Access
Transmitting Direction
Absolute Minimum Input Voltage Value
EC25-A_User_Manual Confidential / Released 66 / 7
0
LTE Module
VOHmax
Maximum Output High Level Voltage Value
VOHmin
Minimum Output High Level Voltage Value
VOLmax
Maximum Output Low Level Voltage Value
VOLmin
Minimum Output Low Level Voltage Value
VSWR
Voltage Standing Wave Ratio
WCDMA
Wideband Code Division Multiple Access
EC25-A User Manual
EC25-A_User_Manual Confidential / Released 67 / 7
0
LTE Module
EC25-A User Manual
10 Appendix B GPRS Coding Scheme
Table 34: Description of Different Coding Schemes
Scheme
Code Rate
USF
Pre-coded USF
Radio Block excl.USF and BCS
BCS
Tail
Coded Bits
Punctured Bits
Data Rate Kb/s
CS-1 CS-2 CS-3 CS-4
1/2 2/3 3/4 1
3 3 3 3
3 6 6 12
181 268 312 428
40 16 16 16
4 4 4 -
456 588 676 456
0 132 220 -
9.05 13.4 15.6 21.4
EC25-A_User_Manual Confidential / Released 68 / 7
0
LTE Module
Multislot Class
Uplink Slots
1 1 1 2 2 2 1 3 3 2 2
3
4 3 1 4 5 2 2
4
6 3 2 4 7 3 3
4
8 4 1 5 9 3 2
5
10 4 2 5 11 4 3
5
12 4 4
5
EC25-A User Manual
11 Appendix C GPRS Multi-slot Class
Twenty-nine classes of GPRS multi-slot modes are defined for MS in GPRS specification. Multi-slot
classes are product dependant, and determine the maximum achievable data rates in both the uplink and
downlink directions. Written as 3+1 or 2+2, the first number indicates the amount of downlink timeslots,
while the second number indicates the amount of uplink timeslots. The active slots determine the total
number of slots the GPRS device can use simultaneously for both uplink and downlink communications.
The description of different multi-slot classes is shown in the following table.
Table 35: GPRS Multi-slot Classes
Downlink Slots
Active Slots
EC25-A_User_Manual Confidential / Released 69 / 7
0
LTE Module Sires
Coding Scheme
Modulation
1 Timeslot
2 Timeslot
4 Timeslot
CS-1:
GMSK
9.05kbps
18.1kbps
36.2kbps
CS-2:
GMSK
13.4kbps
26.8kbps
53.6kbps
CS-3:
GMSK
15.6kbps
31.2kbps
62.4kbps
CS-4:
GMSK
21.4kbps
42.8kbps
85.6kbps
MCS-1
GMSK
C
8.80kbps
17.60kbps
35.20kbps
MCS-2
GMSK
B
11.2kbps
22.4kbps
44.8kbps
MCS-3
GMSK
A
14.8kbps
29.6kbps
59.2kbps
MCS-4
GMSK
C
17.6kbps
35.2kbps
70.4kbps
MCS-5
8-PSK
B
22.4kbps
44.8kbps
89.6kbps
MCS-6
8-PSK
A
29.6kbps
59.2kbps
118.4kbps
MCS-7
8-PSK
B
44.8kbps
89.6kbps
179.2kbps
MCS-8
8-PSK
A
54.4kbps
108.8kbps
217.6kbps
MCS-9
8-PSK
A
59.2kbps
118.4kbps
236.8kbps
EC25 Hardware Design
12 Appendix D EDGE Modulation and
Coding Scheme
Table 36: EDGE Modulation and Coding Scheme
Coding Family
/
/
/
/
EC25_Hardware_Design Confidential / Released 70 /
70
Loading...