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: [phone]

Mail: [e-mail]

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: [e-mail]

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.

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About the Document

History

	Revision			Date		Author		Description
V1.0			2016-03-28			Woody WU		Initial

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Contents

About the Document...................................................................................................................................				2
Contents		.......................................................................................................................................................		3
Table Index...................................................................................................................................................				5
Figure Index .................................................................................................................................................				6
1	Introduction ..........................................................................................................................................			7
	1.1. ......................................................................................................................	Safety Information		7
2	Product ..................................................................................................................................Concept			9
	2.1. ...................................................................................................................	General Description		9
	2.2. ........................................................................................................	Directives and Standards		10
	2.2.1. ..............................................................................................................		FCC Statement	10
	2.3. ...........................................................................................................................	Key Features		10
	2.4. .................................................................................................................	Functional Diagram		12
	2.5. .....................................................................................................................	Evaluation Board		13
3	Application .........................................................................................................................Interface			14
	3.1. .................................................................................................................	General Description		14
	3.2. ........................................................................................................................	Pin Assignment		14
	3.3. .........................................................................................................................	Pin Description		16
	3.4. .....................................................................................................................	Operating Modes		21
	3.5. ...........................................................................................................................	Power Saving		22
	3.5.1. ....................................................................................................................		Sleep Mode	22
	.................................................................................................	3.5.1.1. UART Application		22
	........................................	3.5.1.2. USB Application with USB Remote Wakeup Function		23
	..........................	3.5.1.3. USB Application with USB Suspend/Resume and RI Function		23
	................................................	3.5.1.4. USB Application without USB Suspend Function		24
	3.5.2. ................................................................................................................		Airplane Mode	25
	3.6. ...........................................................................................................................	Power Supply		25
	3.6.1. .........................................................................................................		Power Supply Pins	25
	3.6.2. ..................................................................................................		Decrease Voltage Drop	26
	3.6.3. ..............................................................................Reference Design for Power Supply			27
	3.6.4. ..............................................................................................Monitor the Power Supply			28
	3.7. .......................................................................................................	Turn on and off Scenarios		28
	3.7.1. .............................................................................Turn on Module Using the PWRKEY			28
	3.7.2. ..............................................................................................................		Turn off Module	30
	.............................................................	3.7.2.1. Turn off Module Using the PWRKEY Pin		30
	...................................................................	3.7.2.2. Turn off Module Using AT Command		30
	3.8. .....................................................................................................................	Reset the Module		30
	3.9. ................................................................................................................	USIM Card Interface		32
	3.10. ..........................................................................................................................	USB Interface		34

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	3.11.	UART Interface ........................................................................................................................		36
	3.12.	PCM and I2C Interface ............................................................................................................		38
	3.13.	ADC Function ..........................................................................................................................		41
	3.14.	Network Status Indication........................................................................................................		41
	3.15.	STATUS ...................................................................................................................................		42
	3.16.	Behavior of the RI....................................................................................................................		43
4	GNSS Receiver...................................................................................................................................			45
	4.1.	General Description.................................................................................................................		45
	4.2.	GNSS Performance.................................................................................................................		45
	4.3.	Layout Guideline......................................................................................................................		46
5	Antenna Interface...............................................................................................................................			47
	5.1.	Main/Rx-diversity Antenna Interface........................................................................................		47
	5.1.1.		Pin Definition ..................................................................................................................	47
	5.1.2.		Operating Frequency .....................................................................................................	47
	5.1.3.		Reference Design ..........................................................................................................	47
	5.2.	GNSS Antenna Interface .........................................................................................................		48
	5.3.	Antenna Installation .................................................................................................................		49
	5.3.1.		Antenna Requirement ....................................................................................................	49
	5.3.2. Install the Antenna with RF Connector ..........................................................................			50
6 Electrical, Reliability and Radio Characteristics ............................................................................				53
	6.1.	Absolute Maximum Ratings.....................................................................................................		53
	6.2.	Power Supply Ratings .............................................................................................................		53
	6.3.	Operating Temperature............................................................................................................		54
	6.4.	Current Consumption ..............................................................................................................		54
	6.5.	RF Output Power.....................................................................................................................		54
	6.6.	RF Receiving Sensitivity..........................................................................................................		55
	6.7.	Electrostatic Discharge............................................................................................................		55
7	Mechanical Dimensions ....................................................................................................................			56
	7.1.	Mechanical Dimensions of the Module....................................................................................		56
	7.2.	Footprint of Recommendation .................................................................................................		58
	7.3.	Top View of the Module ...........................................................................................................		59
	7.4.	Bottom View of the Module......................................................................................................		59
8	Storage and Manufacturing ..............................................................................................................			60
	8.1.	Storage ....................................................................................................................................		60
	8.2.	Manufacturing and Welding.....................................................................................................		60
	8.3.	Packaging ................................................................................................................................		61
9	Appendix A Reference.......................................................................................................................			63

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Table Index
TABLE 1: EC25 SERIES FREQUENCY BANDS ................................................................................................	9
TABLE 2: EC25 KEY FEATURES .....................................................................................................................	10
TABLE 3: IO PARAMETERS DEFINITION........................................................................................................	16
TABLE 4: PIN DESCRIPTION...........................................................................................................................	16
TABLE 5: OVERVIEW OF OPERATING MODES.............................................................................................	21
TABLE 6: VBAT AND GND PINS.......................................................................................................................	26
TABLE 7: PWRKEY PIN DESCRIPTION ..........................................................................................................	28
TABLE 8: RESET_N PIN DESCRIPTION .........................................................................................................	31
TABLE 9: PIN DEFINITION OF THE USIM INTERFACE .................................................................................	32
TABLE 10: USB PIN DESCRIPTION ................................................................................................................	34
TABLE 11: PIN DEFINITION OF THE MAIN UART INTERFACE .....................................................................	36
TABLE 12: PIN DEFINITION OF THE DEBUG UART INTERFACE.................................................................	36
TABLE 13: LOGIC LEVELS OF DIGITAL I/O ....................................................................................................	37
TABLE 14: PIN DEFINITION OF PCM AND I2C INTERFACE..........................................................................	39
TABLE 15: PIN DEFINITION OF THE ADC ......................................................................................................	41
TABLE 16: CHARACTERISTIC OF THE ADC ..................................................................................................	41
TABLE 17: PIN DEFINITION OF NETWORK INDICATOR...............................................................................	41
TABLE 18: WORKING STATE OF THE NETWORK INDICATOR.....................................................................	42
TABLE 19: PIN DEFINITION OF STATUS ........................................................................................................	43
TABLE 20: BEHAVIOR OF THE RI ...................................................................................................................	44
TABLE 21: GNSS PERFORMANCE .................................................................................................................	45
TABLE 22: PIN DEFINITION OF THE RF ANTENNA .......................................................................................	47
TABLE 23: THE MODULE OPERATING FREQUENCIES................................................................................	47
TABLE 24: PIN DEFINITION OF GNSS ANTENNA..........................................................................................	48
TABLE 25: GNSS FREQUENCY.......................................................................................................................	49
TABLE 26: ANTENNA REQUIREMENTS..........................................................................................................	49
TABLE 27: ABSOLUTE MAXIMUM RATINGS ..................................................................................................	53
TABLE 28: THE MODULE POWER SUPPLY RATINGS ..................................................................................	53
TABLE 29: OPERATING TEMPERATURE........................................................................................................	54
TABLE 30: CONDUCTED RF OUTPUT POWER .............................................................................................	55
TABLE 31: ELECTROSTATICS DISCHARGE CHARACTERISTICS ...............................................................	55
TABLE 32: RELATED DOCUMENTS................................................................................................................	63
TABLE 33: TERMS AND ABBREVIATIONS......................................................................................................	63
TABLE 34: DESCRIPTION OF DIFFERENT CODING SCHEMES ..................................................................	67

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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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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.

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.

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Cellular terminals or mobiles operating over radio frequency signal and cellular network cannot be guaranteed to connect in all conditions, for example no mobile fee or with an invalid SIM card. While you are in this condition and need emergent help, please remember using emergency call. In order to make or receive a call, the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength.

Your cellular terminal or mobile contains a transmitter and receiver. When it is ON , it receives and transmits radio frequency energy. RF interference can occur if it is used close to TV set, radio, computer or other electric equipment.

In locations with potencially explosive atmospheres, obey all posted signs to turn off wireless devices such as your phone or other cellular terminals. Areas with potencially explosive atmospheres include fuelling areas, below decks on boats, fuel or chemical transfer or storage facilities, areas where the air contains chemicals or particles such as grain, dust or metal powders, etc.

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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	B4/B13
	(with Rx-diversity)
	TDD-LTE	Not supported
	(with Rx-diversity)
	WCDMA	Not supported
	(with Rx-diversity)
	GSM	Not supported
	GNSS	GPS,GLONASS,
		BeiDou/Compass,Galileo,QZSS

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.

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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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

	Feature			Details
Power Supply				Supply voltage: 3.3V~4.3V	Typical supply voltage: 3.8V
				Support up to non-CA CAT4
Transmitting Power				Support 1.4 to 20MHz RF bandwidth
				FDD: Max 50Mbps (UL), 150Mbps (DL)
				TDD: Max 35Mbps (UL), 130Mbps (DL)
LTE Features				Support 16-QAM, 64-QAM and QPSK modulation

Text and PDU mode

Internet Protocol Features Point to point MO and MT

SMS cell broadcast

SMS storage: ME by default

SMS	Support USIM/SIM card: 1.8V, 3.0V

Used for audio function with external codec

USIM Interface Support 8-bit A-law, μ-law and 16-bit linear data formats Support long frame sync and short frame sync

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Support master and slave mode, but must be the master in long frame sync

Compliant with USB 2.0 specification (slave only); the data transfer rate

		can reach up to 480Mbps
	Audio Features	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
	PCM Interface	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
	GNSS Features	Two pins including NET_MODE and NET_STATUS to indicate network
		connectivity status
	AT Commands	Including main antenna (ANT_MAIN), Rx-diversity antenna (ANT_DIV) and
		GNSS antenna (ANT_GNSS)
	Network Indication	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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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_GNSS		ANT_DIV
			Switch		SAW	Switch
			Duplex		LNA
VBAT_RF						SAW
			PA
		APT
			PRx			DRx
			Tx
				Transceiver				NAND
								DDR2
								SDRAM
			IQ			Control
VBAT_BB		PMIC
			Control
	PWRKEY
					Baseband
RESET_N
	ADCs
	STATUS		19.2M
			XO
		VDD_EXT	USB	USIM	PCM	I2C	UART	GPIOs

Figure 1: Functional Diagram

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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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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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WAKEUP_IN 1

AP_READY 2

RESERVED 3 W_DISABLE# 4

NET_MODE 5

NET_STATUS 6 VDD_EXT 7

RESERVED 141

RESERVED 142

GND 8

GND 9

USIM_GND 10

DBG_RXD 11

DBG_TXD 12

USIM_PRESENCE 13

USIM_VDD 14

USIM_DATA 15

USIM_CLK 16

USIM_RST 17

RESERVED 18

RESERVED	RESERVED	GND	VBUS USB	DM USB	DP USB	RXD	TXD	DTR	RTS	CTS	DCD	RI	STATUS	BB VBAT	BB VBAT	RF VBAT	RF VBAT	GND	RESERVED
114	113	72	71	70	69	68	67	66	65	64	63	62	61	60	59	58	57	56	55	GND
																			54
129	117																		53	GND
																			52
		108			103			99			95		90			85				GND
130	118																		51	GND
131	119																		50	GND
132																			49	ANT_MAIN
	120	109			104			100			96		91			86			48	GND
133	121																		144	RESERVED
134	122						82		79	76	73								143	RESERVED
		110			105		83		80	77	74		92			87			47	ANT_GNSS
135	123						84		81	78	75								46	GND
136	124																		45	ADC0
																			44	ADC1
		111			106			101			97		93			88
137	125																		43	RESERVED

																																																			I2C_SDA
																																																	42
138			126
																																																			I2C_SCL
																																																	41
																								98							94							89
139			127
							112					107						102																															40		RESERVED
																																																			RESERVED
																																																	39
140			128																																																RESERVED
																																																	38
																																																			RESERVED
																																																	37
	116			115
						19		20		21		22			23		24		25		26		27			28			29		30		31		32			33			34			35			36
	RESERVED			RESERVED		GND		N RESET		PWRKEY		GND			RESERVED		IN PCM		OUT PCM		SYNC PCM		CLK PCM			RESERVED			RESERVED		RESERVED		RESERVED		RESERVED			RESERVED			RESERVED			DIV ANT			GND
Power Pins													GND Pins																Signal Pins																	RESERVED Pins

Figure 2: Pin Assignment (Top View)

NOTES

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.

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3.3. Pin Description

The following tables show the EC25’s pin definition.

Table 3: IO Parameters Definition

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

Table 4: Pin Description

Power Supply

	Pin Name	Pin No.	I/O	Description	DC Characteristics	Comment
				Power supply for	Vmax=4.3V	It must be able to
	VBAT_BB	59, 60	PI	module baseband	Vmin=3.3V	provide sufficient
				part.	Vnorm=3.8V	current up to 0.8A.
					Vmax=4.3V	It must be able to
				Power supply for		provide sufficient
	VBAT_RF	57, 58	PI		Vmin=3.3V
				module RF part.		current up to 1.8A in a
					Vnorm=3.8V
						transmitting burst.
				Provide 1.8V for	Vnorm=1.8V	Power supply for
	VDD_EXT	7	PO			external GPIO’s pull up
				external circuit.	IOmax=50mA
						circuits.
		8, 9, 19,
	GND	22, 36, 46,		Ground.
		48, 50~54,
		56, 72,
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			85~112
		Turn on/off
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
					Turn on/off the	VIHmax=2.1V
	PWRKEY		21	DI		VIHmin=1.3V
					module.
						VILmax=0.5V
						VIHmax=2.1V
	RESET_N		20	DI	Reset the module.	VIHmin=1.3V
						VILmax=0.5V
		Status Indication
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
					Indicate the module	The drive current	Require external
	STATUS		61	OD		should be less than	pull-up. If unused,
					operating status.
						0.9mA.	keep it open.
					Indicate the module	VOHmin=1.35V	1.8V power domain.
	NET_MODE		5	DO	network registration		If unused, keep it
						VOLmax=0.45V
					mode.		open.
	NET_				Indicate the module	VOHmin=1.35V	1.8V power domain.
			6	DO	network activity		If unused, keep it
	STATUS					VOLmax=0.45V
					status.		open.
		USB Interface
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
	USB_VBUS		71	PI	USB detection.	Vnorm=5.0V
					USB differential data	Compliant with USB	Require differential
	USB_DP		69	IO		2.0 standard
					bus.	specification.	impedance of 90ohm.
					USB differential data	Compliant with USB	Require differential
	USB_DM		70	IO		2.0 standard
					bus.	specification.	impedance of 90ohm.
		USIM Interface
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
	USIM_GND		10		Specified ground for
					USIM card.
					Power supply for	For 1.8V USIM:	Either 1.8V or 3V is
	USIM_VDD		14	PO		Vmax=1.9V	supported by the
					USIM card.
						Vmin=1.7V	module automatically.
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LTE Module Series

EC25-V User Manual

For 3.0V USIM:

Vmax=3.05V

Vmin=2.7V

IOmax=50mA

For 1.8V USIM:

						VILmax=0.6V
						VIHmin=1.2V
						VOLmax=0.45V
					Data signal of USIM	VOHmin=1.35V
	USIM_DATA		15	IO
					card.
						For 3.0V USIM:
						VILmax=1.0V
						VIHmin=1.95V
						VOLmax=0.45V
						VOHmin=2.55V
						For 1.8V USIM:
						VOLmax=0.45V
	USIM_CLK		16	DO	Clock signal of USIM	VOHmin=1.35V
					card.
						For 3.0V USIM:
						VOLmax=0.45V
						VOHmin=2.55V
						For 1.8V USIM:
						VOLmax=0.45V
					Reset signal of	VOHmin=1.35V
	USIM_RST		17	DO
					USIM card.
						For 3.0V USIM:
						VOLmax=0.45V
						VOHmin=2.55V
						VILmin=-0.3V	1.8V power domain.
	USIM_				USIM card insertion	VILmax=0.6V
			13	DI			If unused, keep it
	PRESENCE				detection.	VIHmin=1.2V
							open.
						VIHmax=2.0V
		UART Interface
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
						VOLmax=0.45V	1.8V power domain.
	RI		62	DO	Ring indicator		If unused, keep it
						VOHmin=1.35V
							open.
					Data carrier	VOLmax=0.45V	1.8V power domain.
	DCD		63	DO			If unused, keep it
					detection.	VOHmin=1.35V
							open.
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							LTE Module Series
							EC25-V User Manual
						VOLmax=0.45V	1.8V power domain.
	CTS		64	DO	Clear to send.		If unused, keep it
						VOHmin=1.35V
							open.
						VILmin=-0.3V	1.8V power domain.
						VILmax=0.6V
	RTS		65	DI	Request to send.		If unused, keep it
						VIHmin=1.2V
							open.
						VIHmax=2.0V
							1.8V power domain.
						VILmin=-0.3V	Pull-up by default.
	DTR		66	DI	Data terminal ready,	VILmax=0.6V	Low level wakes up
					sleep mode control.	VIHmin=1.2V	the module.
						VIHmax=2.0V	If unused, keep it
							open.
						VOLmax=0.45V	1.8V power domain.
	TXD		67	DO	Transmit data.		If unused, keep it
						VOHmin=1.35V
							open.
						VILmin=-0.3V	1.8V power domain.
						VILmax=0.6V
	RXD		68	DI	Receive data.		If unused, keep it
						VIHmin=1.2V
							open.
						VIHmax=2.0V
		Debug UART Interface
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
						VOLmax=0.45V	1.8V power domain.
	DBG_TXD		12	DO	Transmit data.		If unused, keep it
						VOHmin=1.35V
							open.
						VILmin=-0.3V	1.8V power domain.
						VILmax=0.6V
	DBG_RXD		11	DI	Receive data.		If unused, keep it
						VIHmin=1.2V
							open.
						VIHmax=2.0V
		ADC Interface
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
					General purpose	Voltage range:	If unused, keep it
	ADC0		45	AI	analog to digital
						0.3V to VBAT_BB	open.
					converter.
					General purpose	Voltage range:	If unused, keep it
	ADC1		44	AI	analog to digital
						0.3V to VBAT_BB	open.
					converter.
		PCM Interface
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
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						LTE Module Series
						EC25-V User Manual
					VILmin=-0.3V	1.8V power domain.
					VILmax=0.6V
	PCM_IN	24	DI	PCM data input.		If unused, keep it
					VIHmin=1.2V
						open.
					VIHmax=2.0V
					VOLmax=0.45V	1.8V power domain.
	PCM_OUT	25	DO	PCM data output.		If unused, keep it
					VOHmin=1.35V
						open.
					VOLmax=0.45V	1.8V power domain.
					VOHmin=1.35V	In master mode, it is
				PCM data frame	VILmin=-0.3V	an output signal. In
	PCM_SYNC	26	IO			slave mode, it is an
				sync signal.	VILmax=0.6V
						input signal.
					VIHmin=1.2V	If unused, keep it
					VIHmax=2.0V	open.

VOLmax=0.45V

VOHmin=1.35V

PCM_CLK 27 IO PCM clock. 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 serial clock.		External pull-up
					resistor is required.
I2C_SCL	41	OD	Used for external
					1.8V only. If unused,
			codec.
					keep it open.
			I2C serial data.		External pull-up
					resistor is required.
I2C_SDA	42	OD	Used for external
					1.8V only. If unused,
			codec.
					keep it open.
RF Interface

	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
	ANT_DIV		35	AI	Diversity antenna.	50ohm impedance.	If unused, keep it
							open.
	ANT_MAIN		49	IO	Main antenna.	50ohm impedance.
	ANT_GNSS		47	AI	GNSS antenna.	50ohm impedance.	If unused, keep it
							open.
		GPIO Pins
	Pin Name		Pin No.	I/O	Description	DC Characteristics	Comment
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