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

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.

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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EC25-V 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 .......................................................................................... 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.

EC25-V User Manual

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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

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

EC25-V_User_Manual Confidential / Released 10 / 69

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

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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

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

ANT_DIV

GND

USB_VBUS

USB_DM

USB_DP

RXD

TXD

DTR

RTS

CTS

DCD

RI

STATUS

VBAT_BB

VBAT_RF

GND

RESERVED

GND

ANT_MAIN

GND

ANT_GNSS

GND

ADC1

RESERVED

I2C_SDA

I2C_SCL

RESERVED

ADC0

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

117

126

125

124

123

122

121

120

119

118

127

128

115

RESERVED

116

139

140

138

137

136

135

134

133

132

131

130

129

114

RESERVED

Power Pins

RESERVED

Signal Pins RESERVED Pins

GND Pins

RESERVED

141

142

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.

EC25-V User Manual

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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

EC25-V User Manual

EC25-V_User_Manual Confidential / Released 19 / 69

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

EC25-V User Manual

EC25-V_User_Manual Confidential / Released 20 / 69

LTE Module Series

WAKEUP_IN

1

DI

Sleep mode control.

VILmin=-0.3V

VILmax=0.6V

VIHmin=1.2V

VIHmax=2.0V

1.8V power domain.

Pull-up by default.

Low level wakes up

the module. If

unused, keep it open.

W_DISABLE#

4

DI

Airplane mode

control.

VILmin=-0.3V

VILmax=0.6V

VIHmin=1.2V

VIHmax=2.0V

1.8V power domain.

Pull-up by default.

In low voltage level,

module can enter into

airplane mode. If

unused, keep it open.

AP_READY

2

DI

Application

processor sleep

state detection.

VILmin=-0.3V

VILmax=0.6V

VIHmin=1.2V

VIHmax=2.0V

1.8V power domain.

If unused, keep it

open.

RESERVED Pins

Pin Name

Pin No.

I/O

Description

DC Characteristics

Comment

RESERVED

3, 18, 23,

28~34,

37~40, 43,

55, 73~84,

113~144

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-V User Manual

3.4. Operating Modes

The table below briefly summarizes the various operating modes referred in the following chapters.

Table 5: Overview of Operating Modes

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LTE Module Series

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.

RXD

TXD

RI

DTR

AP_READY

TXD

RXD

EINT

GPIO

Module

Host

GND

EC25-V 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.

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-V_User_Manual Confidential / Released 22 / 69

LTE Module Series

USB_VBUS

USB_DP

USB_DM

AP_READY

VDD

USB_DP

USB_DM

GPIO

Module

Host

GND

EC25-V 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.

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

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LTE Module Series

USB_VBUS

USB_DP

USB_DM

AP_READY

VDD

USB_DP

USB_DM

GPIO

Module Host

GND

RI

EINT

USB_VBUS

USB_DP

USB_DM

AP_READY

VDD

USB_DP

USB_DM

GPIO

Module Host

RI EINT

Power Switch

GPIO

GND

EC25-V User Manual

state.

The following figure shows the connection between the module and the host.

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.

EC25-V_User_Manual Confidential / Released 24 / 69

Figure 6: Sleep Application without Suspend Function

LTE Module Series

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.

NOTES

NOTE

EC25-V User Manual

Opening power switch to supply power to USB_VBUS will wake up the module.

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.

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.

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LTE Module Series

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

VBAT

Transmit

burst

Transmit

burst

Min.3.3V

Ripple

Drop

EC25-V 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 4G network.

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-V_User_Manual Confidential / Released 26 / 69

Figure 7: Power Supply Limits during Transmit Burst

Module

VBAT_RF

VBAT_BB

VBAT

C1

100uF

C6

100nFC733pFC810pF

+

C2

100nF

C5

100uF

C3

33pF

C4

10pF

D1

5.1V

Figure 8: Star Structure of the Power Supply

DC_IN

MIC29302WU

IN OUT

EN

GND

ADJ

2 4

1

3

5

VBAT

100nF

470uF

100nF

100K

47K

470uF

470R

51K

1%

4.7K

47K

VBAT_EN

LTE Module Series

EC25-V User Manual

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.

Figure 9: Reference Circuit of Power Supply

EC25-V_User_Manual Confidential / Released 27 / 69

LTE Module Series

Pin Name

Pin No.

Description

DC Characteristics

Comment

PWRKEY

21

Turn on/off the module.

VIHmax=2.1V

VIHmin=1.3V

VILmax=0.5V

Turn on pulse

PWRKEY

4.7K

47K

≥ 100ms

EC25-V 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

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.

Figure 10: Turn on the Module Using Driving Circuit

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-V_User_Manual Confidential / Released 28 / 69

LTE Module Series

PWRKEY

S1

Close to S1

TVS

V

IL

≤ 0.5V

V

IH

≥ 1.3V

VBAT

PWRKEY

≥ 100ms

RESET_N

STATUS (OD)

Inactive

ActiveUART

NOTE

Inactive

ActiveUSB

TBD

Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is no less than

30ms.

NOTE

EC25-V User Manual

Figure 11: Turn on the Module Using Keystroke

The turn on scenario is illustrated in the following figure.

Figure 12: Timing of Turning on Module

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LTE Module Series

VBAT

PWRKEY

TBDTBD

RUNNING

Power-down procedure

OFF

Module Status

STATUS (OD)

EC25-V 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.

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.

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LTE Module Series

Pin Name

Pin No.

Description

DC Characteristics

Comment

RESET_N

20

Reset the module.

VIHmax=2.1V

VIHmin=1.3V

VILmax=0.5V

Reset pulse

RESET_N

4.7K

47K

TBD

RESET_N

S2

Close to S2

TVS

EC25-V 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.

Figure 14: Reference Circuit of RESET_N by Using Driving Circuit

Figure 15: Reference Circuit of RESET_N by Using Button

The reset scenario is illustrated in the following figure.

EC25-V_User_Manual Confidential / Released 31 / 69

LTE Module Series

VIL ≤ 0.5V

VIH ≥ 1.3V

VBAT

≥Treset_min

RESETTING

Module Status

RUNNING

RESET_N

RUNNING

≤Treset_max

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 Specified ground for USIM card.

NOTES

EC25-V User Manual

Figure 16: Timing of Resetting Module

3.9. USIM Card Interface

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

EC25-V_User_Manual Confidential / Released 32 / 69

LTE Module Series

Module

USIM_VDD

USIM_GND

USIM_RST

USIM_CLK

USIM_DATA

USIM_PRESENCE

22R

VDD_EXT

51K

100nF USIM Connector

GND

33pF 33pF 33pF

VCC RST

CLK

IO

VPP

GND

USIM_VDD

15K

Module

USIM_VDD

USIM_GND

USIM_RST USIM_CLK

USIM_DATA

22R

100nF

USIM Connector

GND

33pF 33pF 33pF

VCC

RST CLK IO

VPP

GND

15K

USIM_VDD

EC25-V 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.

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.

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-V_User_Manual Confidential / Released 33 / 69

LTE Module Series

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-V 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-V_User_Manual Confidential / Released 34 / 69

LTE Module Series

USB_DP

USB_DM

GND

USB_DP

USB_DM

GND

R1

R2

Close to Module

R3

R4

Test Points

ESD Array

NM_0R

0R

Minimize this stub

Module

MCU

USB_VBUS

VDD

EC25 module can only be used as a slave device.

NOTE

EC25-V User Manual

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.

EC25-V_User_Manual Confidential / Released 35 / 69

LTE Module Series

Pin Name

Pin No.

I/O

Description

Comment

RI

62

DO

Ring indicator

1.8V power domain

DCD

63

DO

Data carrier detection

1.8V power domain

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-V 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

Table 12: Pin Definition of the Debug UART Interface

The logic levels are described in the following table.

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LTE Module Series

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

VCCA VCCB

OE

A1

A2

A3

A4

A5

A6

A7

A8

GND

B1

B2

B3

B4

B5

B6

B7

B8

VDD_EXT

RI

DCD

RTS

RXD

DTR

CTS

TXD

51K

0.1uF

RI_MCU

DCD_MCU

RTS_MCU

RXD_MCU

DTR_MCU

CTS_MCU

TXD_MCU

VDD_MCU

Translator

EC25-V 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.

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.

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LTE Module Series

MCU/ARM

/TXD

/RXD

VDD_EXT

10K

VCC_MCU

4.7K

10K

VDD_EXT

TXD

RXD

RTS CTS DTR

RI

/RTS /CTS

GND

GPIO DCD

Module

GPIO

EINT

VDD_EXT

4.7K

GND

1nF

Transistor circuit solution is not suitable for high baud rates exceeding 460Kbps.

NOTE

EC25-V User Manual

Figure 21: Reference Circuit with Transistor Circuit

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.

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PCM_CLK

PCM_SYNC

PCM_OUT

MSB

LSB

MSB

125us

1 2 256255

PCM_IN

MSB

LSBMSB

Figure 22: Primary Mode Timing

PCM_CLK

PCM_SYNC

PCM_OUT

MSB

LSB

PCM_IN

125us

MSB

1 2 1615

LSB

Pin Name

Pin No.

I/O

Description

Comment

PCM_IN

24

DI

PCM data input

1.8V power domain

LTE Module Series

EC25-V User Manual

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

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Figure 23: Auxiliary Mode Timing

LTE Module Series

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

PCM_IN

PCM_OUT

PCM_SYNC

PCM_CLK

I2C_SCL

I2C_SDA

Module

1.8V

4.7K

BCLK

LRCK

DAC

ADC

SCL

SDA

BIAS

MICBIAS

INP INN

LOUTP

LOUTN

Codec

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.

NOTES

EC25-V 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.

Figure 24: Reference Circuit of PCM Application with Audio Codec

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LTE Module Series

Pin Name

Pin No.

Description

ADC0

45

General purpose analog to digital converter

ADC1

44

General purpose analog to digital converter

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.

I/O

Description

Comment

NET_MODE

5

DO

Indicate the module network registration

1.8V power domain

EC25-V 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

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

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mode.

NET_STATUS

6

DO

Indicate the module network activity

status.

1.8V power domain

Table 18: Working State of the Network Indicator

Pin Name

Status

Description

NET_MODE Always High

Registered in LTE network

Always Low

Others

NET_STATUS

Flicker slowly (200ms High/1800ms Low)

Network searching

Flicker slowly (1800ms High/200ms Low)

Idle

Flicker quickly (125ms High/125ms Low)

Data transfer is ongoing

Always High

Voice calling

4.7K

47K

VBAT

2.2K

Module

Network Indicator

LTE Module Series

EC25-V User Manual

A reference circuit is shown in the following figure.

Figure 25: Reference Circuit of the Network Indicator

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.

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LTE Module Series

Pin Name

Pin No.

I/O

Description

Comment

STATUS

61

OD

Indicate the module operation status

Require external pull-up

VDD_MCU

10K

Module

STATUS MCU_GPIO

Module

STATUS

VBAT

2.2K

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.

NOTE

EC25-V 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.

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.

In addition, RI behavior can be configured flexibly. The default behavior of the RI is shown as below.

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LTE Module Series

State

Response

Idle

RI keeps high level

URC

RI outputs 120ms low pulse when new URC returns

EC25-V 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.

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LTE Module Series

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

XTRA enabled

TBD s

EC25-V 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

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LTE Module Series

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

EC25-V 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-V_User_Manual Confidential / Released 46 / 69

LTE Module Series

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

B4

1710 ~ 1755

2110 ~ 2155

MHz

B13

777 ~ 787

746 ~ 756

MHz

EC25-V 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

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.

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LTE Module Series

ANT_MAIN

R1 0R

C1

Module

Main antenna

NM

C2

NM

R2 0R

C3

Diversity antenna

NM

C4

NM

ANT_DIV

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.

Pin Name

Pin No.

I/O

Description

Comment

ANT_GNSS

47

AI

GNSS antenna

50ohm impedance

NOTES

EC25-V User Manual

Figure 27: Reference Circuit of Antenna Interface

5.2. GNSS Antenna Interface

The following tables show the GNSS antenna pin definition and frequency specification.

Table 24: Pin Definition of GNSS Antenna

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LTE Module Series

Type

Frequency

Unit

GPS/Galileo/QZSS

1575.42 ± 1.023

MHz

GLONASS

1597.5 ~ 1605.8

MHz

BeiDou

1561.098 ± 2.046

MHz

GNSS Antenna

VDD

Module

ANT_GNSS

47nH

10R

0.1uF

100pF

NM

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.

Type

Requirements

NOTES

Table 25: GNSS Frequency

The reference design of GNSS antenna is shown as below.

EC25-V User Manual

Figure 28: Reference Circuit of GNSS Antenna

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

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GNSS

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.)

GSM/LTE

VSWR: ≤ 2

Gain (dBi): 1

Max Input Power (W): 50

Input Impedance (ohm): 50

Polarization Type: Vertical

Cable Insertion Loss: < 1dB

(LTE B13)

Cable Insertion Loss: < 1.5dB

(LTE B4)

LTE Module Series

EC25-V User Manual

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-V_User_Manual Confidential / Released 50 / 69

Figure 29: Dimensions of the UF.L-R-SMT Connector (Unit: mm)

LTE Module Series

EC25-V User Manual

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

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The following figure describes the space factor of mated connector.

LTE Module Series

EC25-V User Manual

Figure 31: Space Factor of Mated Connector (Unit: mm)

For more details, please visit http://www.hirose.com.

EC25-V_User_Manual Confidential / Released 52 / 69

LTE Module Series

Parameter

Min.

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

Conditions

Min.

Typ.

Max.

Unit

VBAT

VBAT_BB and

Voltage must stay within the

3.3

3.8

4.3

V

EC25-V 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

Table 28: The Module Power Supply Ratings

EC25-V_User_Manual Confidential / Released 53 / 69

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 Series

EC25-V 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-V_User_Manual Confidential / Released 54 / 69

Table 30: Conducted RF Output Power

Frequency

Max.

Min.

LTE FDD B4/B13

23dBm±2dB

<-44dBm

Tested Points

Contact Discharge

Air Discharge

Unit

VBAT, GND

±5

±10

kV

All Antenna Interfaces

±4

±8

kV

Other Interfaces

±0.5

±1

kV

6.6. RF Receiving Sensitivity

LTE Module Series

EC25-V User Manual

This information will be added in future version of this document.

6.7. Electrostatic Discharge

The module is not protected against electrostatics discharge (ESD) in general. Consequently, it is subject

to ESD handling precautions that typically apply to ESD sensitive components. Proper ESD handling and

packaging procedures must be applied throughout the processing, handling and operation of any

application that incorporates the module.

The following table shows the module electrostatics discharge characteristics.

Table 31: Electrostatics Discharge Characteristics

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LTE Module Series

(32+/-0.15)

(29+/-0.15)

0.8

2.4+/-0.2

EC25-V 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

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Figure 32: Module Top and Side Dimensions

LTE Module Series

29.0

32.0

EC25-V User Manual

Figure 33: Module Bottom Dimensions (Bottom View)

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7.2. Footprint of Recommendation

Keepout area

29.0

32.0

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.

NOTES

LTE Module Series

EC25-V User Manual

Figure 34: Recommended Footprint (Top View)

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7.3. Top View of the Module

LTE Module Series

EC25-V User Manual

Figure 35: Top View of the Module

7.4. Bottom View of the Module

Figure 36: Bottom View of the Module

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LTE Module Series

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.

NOTE

EC25-V 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.

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

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LTE Module Series

Time

50

100

150 200

250 300

50

100

150

200

250

160 ºC

200 ºC

217

0

70s~120s

40s~60s

Between 1~3 ºC/s

Preheat Heating Cooling

ºC

s

Liquids Temperature

Temperature

EC25-V 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.

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.

Figure 37: Liquids Temperature

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LTE Module Series

30.3

±0.15

29.3

±0.15

30.3

±0.15

32.5

±0.15

33.5

±0.15

0.35± 0.05

4.2

±0.15

3.1

±0.15

32.5± 0.15

33.5± 0.15

4.00

±0.1

2.00

±0.1

1.75

±0.1

20.20

±0.15

44.00

±0.3

44.00

±0.1

1.50

±

0.1

Direction of feed

Cover tape

13

100

44.5

+0.20

-0.00

48.5

EC25-V User Manual

Figure 38: Carrier Tape

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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

Discontinuous Transmission

Table 32: Related Documents

LTE Module Series

EC25-V User Manual

Table 33: Terms and Abbreviations

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LTE Module Series

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

Global System for Mobile Communications

HR

Half Rate

HSPA

High Speed Packet Access

HSDPA

High Speed Downlink Packet Access

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

MO

Mobile Originated

MS

Mobile Station (GSM engine)

MT

Mobile Terminated

PAP

Password Authentication Protocol

PCB

Printed Circuit Board

PDU

Protocol Data Unit

EC25-V User Manual

EC25-V_User_Manual Confidential / Released 64 / 69

LTE Module Series

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

Time Division Duplexing

TDMA

Time Division Multiple Access

TD-SCDMA

Time Division-Synchronous Code Division Multiple Access

TX

Transmitting Direction

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

Absolute Minimum Input Voltage Value

EC25-V User Manual

EC25-V_User_Manual Confidential / Released 65 / 69

LTE Module Series

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

EC25-V User Manual

Directives and Standards

The EC25-V module is designed to comply with the FCC statements. FCC ID: XMR201607EC25V, The Host system using EC25-V, should have label indicated FCC ID: XMR201607EC25V.

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 20 cm between the radiator & your body.

If using a permanently affixed label, the modular transmitter must be labeled with its own FCC identification number, and, if the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: “Contains Transmitter Module FCC ID: XMR201607EC25V” or “Contains FCC ID: XMR201607EC25V”. Any similar wording that expresses the same meaning may be used. The Grantee may either provide such a label, an example of which must be included in the application for equipment authorization, or, must provide adequate instructions along with the module which explain this requirement. In the latter case, a copy of these instructions must be included in the application for equipment authorization.

This device is to be used in mobile or fixed applications only. Antenna gain including cable loss must not exceed 10.71 dBi of frequency band 777-787 MHz, 6.5 dBi of frequency b

and 1710-1755 MHz, for the purpose of satisfying the requirements of 2.1043 and 2.1091. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and m

ust not be co-located or operated in conjunction with any antenna or transmitter not described under this FCC ID. The final product operating with this transmitter must include operating instructions and antenna installation instructions, for end-users and installers to satisfy RF exposure compliance requirements.

EC25-V_User_Manual Confidential / Released 66 / 69

Quectel Wireless Solutions 201607EC25V User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual