Quectel EG91 Series Supplement

EG91 Hardware Design
LTE Standard Module Series
Rev. EG91_Hardware_Design_V1.4
Date: 2019-03-29
Status: Released
www.quectel.com

LTE Standard Module Series
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About the Document
History
Revision
Date
Author
Description
1.0
2017-03-22
Felix YIN/
Yeoman CHEN/
Jackie WANG
Initial
1.1
2018-01-23
Felix YIN/
Rex WANG
1. Added band B28A.
2. Updated the description of UMTS and GSM
features in Table 2.
3. Updated the functional diagram in Figure 1.
4. Updated module operating frequencies in
Table 21.
5. Updated current consumption in Table 26.
6. Updated RF output power in Table 27.
7. Updated the conducted RF receiving
sensitivity in Table 28.
8. Updated the GPRS multi-slot classes in Table
33.
9. Added thermal consideration in Chapter 5.8
10. Added a GND pad in each of the four corners
of the module’s footprint in Chapter 6.2.
11. Updated storage information in Chapter 7.1.
12. Added packaging information in Chapter 7.3.
1.2
2018-03-14
Felix YIN/
Rex WANG
1. Added the description of EG91-NA.
2. Updated the functional diagram in Figure 1.
3. Updated pin assignment in Figure 2.
4. Updated GNSS function in Table 1.
5. Updated GNSS Features in Table 2.
6. Updated reference circuit of USB interface in
Figure 21.
7. Added description of GNSS receiver in
Chapter 4.
8. Updated pin definition of RF antenna in Table
21.
9. Updated module operating frequencies in
Table 22.
10. Added description of GNSS antenna
interface in Chapter 5.2.

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11. Updated antenna requirements in Table 25.
12. Updated RF output power in Table 32.
1.3
2019-02-03
Ward WANG/
Nathan LIU/
Rex WANG
1. Added new variants EG91-NS, EG91-V,
EG91-EC and related contents.
2. Opened pin 24 as ADC0 and added related
contents.
3. Updated functional diagram (Figure 1)
4. Updated pin assignment (Figure 2)
5. Updated GNSS features (Table 2)
6. Added USB_BOOT interface information
(Chapter 3.18)
7. Updated storage information (Chapter 8.1)
8. Updated module operating frequencies
(Table 23)
9. Updated antenna requirements (Table 26)
10. Added current consumption of EG91-NS,
EG91-V and EG91-EC (Table 32, 33 and 34)
11. Added conducted RF receiving sensitivity of
EG91-NS, EG91-V and EG91-EC (Table 39,
40 and 41)
1.4
2019-03-29
Ward WANG
1. Modified module name EG91-EC to EG91-
EX, and EG91-V to EG91-VX
2. Added newly supported 9.x of Android USB
serial driver (Table 2)
3. Modified the reflow temperature range as .
238ºC~245ºC (Chapter 8.2)

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Contents
About the Document.................................................................................................................................. 2
Contents...................................................................................................................................................... 4
Table Index.................................................................................................................................................. 6
Figure Index................................................................................................................................................ 8
1Introduction ....................................................................................................................................... 10
1.1. Safety Information................................................................................................................... 11
2Product Concept............................................................................................................................... 12
2.1. General Description................................................................................................................ 12
2.2. Key Features .......................................................................................................................... 13
2.3. Functional Diagram ................................................................................................................ 15
2.4. Evaluation Board .................................................................................................................... 16
3Application Interfaces ...................................................................................................................... 17
3.1. General Description................................................................................................................ 17
3.2. Pin Assignment....................................................................................................................... 18
3.3. Pin Description........................................................................................................................ 19
3.4. Operating Modes.................................................................................................................... 26
3.5. Power Saving.......................................................................................................................... 27
3.5.1. Sleep Mode ................................................................................................................... 27
3.5.1.1. UART Application................................................................................................ 27
3.5.1.2. USB Application with USB Remote Wakeup Function ....................................... 28
3.5.1.3. USB Application with USB Suspend/Resume and RI Function ......................... 28
3.5.1.4. USB Application without USB Suspend Function............................................... 29
3.5.2. Airplane Mode ............................................................................................................... 30
3.6. Power Supply.......................................................................................................................... 30
3.6.1. Power Supply Pins ........................................................................................................ 30
3.6.2. Decrease Voltage Drop................................................................................................. 31
3.6.3. Reference Design for Power Supply............................................................................. 32
3.6.4. Monitor the Power Supply............................................................................................. 32
3.7. Power-on/off Scenarios.......................................................................................................... 33
3.7.1. Turn on Module Using the PWRKEY ............................................................................ 33
3.7.2. Turn off Module............................................................................................................. 35
3.7.2.1. Turn off Module Using the PWRKEY Pin............................................................ 35
3.7.2.2. Turn off Module Using AT Command.................................................................. 35
3.8. Reset the Module.................................................................................................................... 36
3.9. (U)SIM Interfaces.................................................................................................................... 37
3.10. USB Interface ......................................................................................................................... 40
3.11. UART Interfaces..................................................................................................................... 42
3.12. PCM and I2C Interfaces......................................................................................................... 44
3.13. SPI Interface........................................................................................................................... 47
3.14. Network Status Indication....................................................................................................... 47

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3.15. STATUS.................................................................................................................................. 48
3.16. ADC Interface......................................................................................................................... 49
3.17. Behaviors of RI....................................................................................................................... 50
3.18. USB_BOOT Interface............................................................................................................. 51
4GNSS Receiver.................................................................................................................................. 53
4.1. General Description................................................................................................................ 53
4.2. GNSS Performance................................................................................................................ 53
4.3. Layout Guidelines................................................................................................................... 54
5Antenna Interfaces............................................................................................................................ 55
5.1. Main/Rx-diversity Antenna Interfaces..................................................................................... 55
5.1.1. Pin Definition ................................................................................................................. 55
5.1.2. Operating Frequency .................................................................................................... 55
5.1.3. Reference Design of RF Antenna Interface.................................................................. 56
5.1.4. Reference Design of RF Layout.................................................................................... 57
5.2. GNSS Antenna Interface........................................................................................................ 59
5.3. Antenna Installation................................................................................................................ 60
5.3.1. Antenna Requirement ................................................................................................... 60
5.3.2. Recommended RF Connector for Antenna Installation ................................................ 61
6Electrical, Reliability and Radio Characteristics........................................................................... 63
6.1. Absolute Maximum Ratings.................................................................................................... 63
6.2. Power Supply Ratings............................................................................................................ 63
6.3. Operation and Storage Temperatures ................................................................................... 64
6.4. Current Consumption ............................................................................................................. 65
6.5. RF Output Power.................................................................................................................... 72
6.6. RF Receiving Sensitivity......................................................................................................... 73
6.7. Electrostatic Discharge........................................................................................................... 75
6.8. Thermal Consideration........................................................................................................... 75
7Mechanical Dimensions................................................................................................................... 78
7.1. Mechanical Dimensions of the Module................................................................................... 78
7.2. Recommended Footprint........................................................................................................ 80
7.3. Design Effect Drawings of the Module................................................................................... 81
8Storage, Manufacturing and Packaging......................................................................................... 82
8.1. Storage ................................................................................................................................... 82
8.2. Manufacturing and Soldering ................................................................................................. 83
8.3. Packaging............................................................................................................................... 84
9Appendix A References.................................................................................................................... 86
10 Appendix B GPRS Coding Schemes .............................................................................................. 90
11 Appendix C GPRS Multi-slot Classes............................................................................................. 91
12 Appendix D EDGE Modulation and Coding Schemes .................................................................. 93

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Table Index
TABLE 1: FREQUENCY BANDS OF EG91 SERIES MODULE ....................................................................... 12
TABLE 2: KEY FEATURES OF EG91 MODULE............................................................................................... 13
TABLE 3: IO PARAMETERS DEFINITION........................................................................................................ 19
TABLE 4: PIN DESCRIPTION ........................................................................................................................... 19
TABLE 5: OVERVIEW OF OPERATING MODES............................................................................................. 26
TABLE 6: PIN DEFINITION OF VBAT AND GND ............................................................................................. 31
TABLE 7: PIN DEFINITION OF PWRKEY ........................................................................................................ 33
TABLE 8: PIN DEFINITION OF RESET_N ....................................................................................................... 36
TABLE 9: PIN DEFINITION OF (U)SIM INTERFACES..................................................................................... 38
TABLE 10: PIN DEFINITION OF USB INTERFACE ......................................................................................... 40
TABLE 11: PIN DEFINITION OF MAIN UART INTERFACES........................................................................... 42
TABLE 12: PIN DEFINITION OF DEBUG UART INTERFACE ......................................................................... 42
TABLE 13: LOGIC LEVELS OF DIGITAL I/O .................................................................................................... 43
TABLE 14: PIN DEFINITION OF PCM AND I2C INTERFACES ....................................................................... 46
TABLE 15: PIN DEFINITION OF SPI INTERFACE ........................................................................................... 47
TABLE 16: PIN DEFINITION OF NETWORK STATUS INDICATOR ................................................................ 48
TABLE 17: WORKING STATE OF NETWORK STATUS INDICATOR .............................................................. 48
TABLE 18: PIN DEFINITION OF STATUS ........................................................................................................ 49
TABLE 19: PIN DEFINITION OF ADC INTERFACE ......................................................................................... 49
TABLE 20: CHARACTERISTICS OF ADC INTERFACE................................................................................... 50
TABLE 21: DEFAULT BEHAVIORS OF RI ........................................................................................................ 50
TABLE 22: PIN DEFINITION OF USB_BOOT INTERFACE ............................................................................. 51
TABLE 23: GNSS PERFORMANCE ................................................................................................................. 53
TABLE 24: PIN DEFINITION OF RF ANTENNA ............................................................................................... 55
TABLE 25: MODULE OPERATING FREQUENCIES ........................................................................................ 55
TABLE 26: PIN DEFINITION OF GNSS ANTENNA INTERFACE..................................................................... 59
TABLE 27: GNSS FREQUENCY....................................................................................................................... 59
TABLE 28: ANTENNA REQUIREMENTS.......................................................................................................... 60
TABLE 29: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 63
TABLE 30: POWER SUPPLY RATINGS ........................................................................................................... 63
TABLE 31: OPERATION AND STORAGE TEMPERATURES .......................................................................... 64
TABLE 32: EG91-E CURRENT CONSUMPTION ............................................................................................. 65
TABLE 33: EG91-NA CURRENT CONSUMPTION........................................................................................... 67
TABLE 34: EG91-NS CURRENT CONSUMPTION .......................................................................................... 68
TABLE 35: EG91-VX CURRENT CONSUMPTION........................................................................................... 69
TABLE 36: EG91-EX CURRENT CONSUMPTION........................................................................................... 70
TABLE 37: GNSS CURRENT CONSUMPTION OF EG91 ............................................................................... 72
TABLE 38: RF OUTPUT POWER ..................................................................................................................... 72
TABLE 39: EG91-E CONDUCTED RF RECEIVING SENSITIVITY.................................................................. 73
TABLE 40: EG91-NA CONDUCTED RF RECEIVING SENSITIVITY ............................................................... 73
TABLE 41: EG91-NS CONDUCTED RF RECEIVING SENSITIVITY ............................................................... 74
TABLE 42: EG91-VX CONDUCTED RF RECEIVING SENSITIVITY ............................................................... 74

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TABLE 43: EG91-EX CONDUCTED RF RECEIVING SENSITIVITY ............................................................... 74
TABLE 44: ELECTROSTATIC DISCHARGE CHARACTERISTICS ................................................................. 75
TABLE 45: RECOMMENDED THERMAL PROFILE PARAMETERS ............................................................... 83
TABLE 46: RELATED DOCUMENTS................................................................................................................ 86
TABLE 47: TERMS AND ABBREVIATIONS ...................................................................................................... 86
TABLE 48: DESCRIPTION OF DIFFERENT CODING SCHEMES .................................................................. 90
TABLE 49: GPRS MULTI-SLOT CLASSES ...................................................................................................... 91
TABLE 50: EDGE MODULATION AND CODING SCHEMES........................................................................... 93

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Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 16
FIGURE 2: PIN ASSIGNMENT (TOP VIEW)..................................................................................................... 18
FIGURE 3: SLEEP MODE APPLICATION VIA UART....................................................................................... 27
FIGURE 4: SLEEP MODE APPLICATION WITH USB REMOTE WAKEUP .................................................... 28
FIGURE 5: SLEEP MODE APPLICATION WITH RI ......................................................................................... 29
FIGURE 6: SLEEP MODE APPLICATION WITHOUT SUSPEND FUNCTION ................................................ 29
FIGURE 7: POWER SUPPLY LIMITS DURING BURST TRANSMISSION...................................................... 31
FIGURE 8: STAR STRUCTURE OF THE POWER SUPPLY............................................................................ 32
FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY .............................................................................. 32
FIGURE 10: TURN ON THE MODULE USING DRIVING CIRCUIT................................................................. 33
FIGURE 11: TURN ON THE MODULE USING BUTTON ................................................................................. 34
FIGURE 12: POWER-ON SCENARIO .............................................................................................................. 34
FIGURE 13: POWER-OFF SCENARIO ............................................................................................................ 35
FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT ...................................... 36
FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON ...................................................... 37
FIGURE 16: RESET SCENARIO ...................................................................................................................... 37
FIGURE 17: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH AN 8-PIN (U)SIM CARD CONNECTOR
................................................................................................................................................................... 39
FIGURE 18: REFERENCE CIRCUIT OF (U)SIM INTERFACE WITH A 6-PIN (U)SIM CARD CONNECTOR. 39
FIGURE 19: REFERENCE CIRCUIT OF USB INTERFACE ............................................................................ 41
FIGURE 20: REFERENCE CIRCUIT WITH TRANSLATOR CHIP ................................................................... 43
FIGURE 21: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT .............................................................. 44
FIGURE 22: PRIMARY MODE TIMING ............................................................................................................ 45
FIGURE 23: AUXILIARY MODE TIMING .......................................................................................................... 45
FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC .................................... 46
FIGURE 25: REFERENCE CIRCUIT OF SPI INTERFACE WITH PERIPHERALS ......................................... 47
FIGURE 26: REFERENCE CIRCUIT OF NETWORK STATUS INDICATOR ................................................... 48
FIGURE 27: REFERENCE CIRCUIT OF STATUS ........................................................................................... 49
FIGURE 28: REFERENCE CIRCUIT OF USB_BOOT INTERFACE ................................................................ 51
FIGURE 29: TIMING SEQUENCE FOR ENTERING INTO EMERGENCY DOWNLOAD MODE.................... 52
FIGURE 30: REFERENCE CIRCUIT OF RF ANTENNA INTERFACE ............................................................. 57
FIGURE 31: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB...................................................................... 57
FIGURE 32: COPLANAR WAVEGUIDE DESIGN ON A 2-LAYER PCB ........................................................... 58
FIGURE 33: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND)
................................................................................................................................................................... 58
FIGURE 34: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE GROUND)
................................................................................................................................................................... 58
FIGURE 35: REFERENCE CIRCUIT OF GNSS ANTENNA............................................................................. 60
FIGURE 36: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM)................................................ 61
FIGURE 37: MECHANICALS OF U.FL-LP CONNECTORS ............................................................................. 62
FIGURE 38: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 62

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FIGURE 39: REFERENCED HEATSINK DESIGN (HEATSINK AT THE TOP OF THE MODULE) .................. 76
FIGURE 40: REFERENCED HEATSINK DESIGN (HEATSINK AT THE BACKSIDE OF CUSTOMERS’ PCB)
................................................................................................................................................................... 77
FIGURE 41: MODULE TOP AND SIDE DIMENSIONS..................................................................................... 78
FIGURE 42: MODULE BOTTOM DIMENSIONS (TOP VIEW) ......................................................................... 79
FIGURE 43: RECOMMENDED FOOTPRINT (TOP VIEW) .............................................................................. 80
FIGURE 44: TOP VIEW OF THE MODULE ...................................................................................................... 81
FIGURE 45: BOTTOM VIEW OF THE MODULE.............................................................................................. 81
FIGURE 46: REFLOW SOLDERING THERMAL PROFILE.............................................................................. 83
FIGURE 47: TAPE DIMENSIONS ..................................................................................................................... 84
FIGURE 48: REEL DIMENSIONS ..................................................................................................................... 85
FIGURE 49: TAPE AND REEL DIRECTIONS ................................................................................................... 85

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1Introduction
This document defines the EG91 module and describes its air interface and hardware interface which are
connected with customers’ applications.
This document can help customers quickly understand module interface specifications, electrical and
mechanical details, as well as other related information of EG91 module. Associated with application note
and user guide, customers can use EG91 module to design and set up mobile applications easily.

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1.1. Safety Information
The following safety precautions must be observed during all phases of operation, such as usage, service
or repair of any cellular terminal or mobile incorporating EG91 module. Manufacturers of the cellular terminal
should send the following safety information to users and operating personnel, and incorporate these
guidelines into all manuals supplied with the product. If not so, Quectel assumes no liability for customers’
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. Please comply with laws and regulations restricting the
use of wireless devices while driving.
Switch off the cellular terminal or mobile before boarding an aircraft. The operation
of wireless appliances in an aircraft is forbidden to prevent interference with
communication systems. If the device offers an Airplane Mode, then it should be
enabled prior to boarding an aircraft. Please consult the airline staff for more
restrictions on the use of wireless devices on boarding the aircraft.
Wireless devices may cause interference on sensitive medical equipment, so
please be awareof the restrictions on the use of wireless devices when in hospitals,
clinics or other healthcare facilities.
Cellular terminals or mobiles operating over radio signals and cellular network
cannot be guaranteed to connect in all possible conditions (for example, with unpaid
bills or with an invalid (U)SIM card). When emergent help is needed in such
conditions, please remember using emergency call. In order to make or receive a
call, the cellular terminal or mobile must be switched on in a service area with
adequate cellular signal strength.
The cellular terminal or mobile contains a transmitter and receiver. When it is ON,
it receives and transmits radio frequency signals. RF interference can occur if it is
used close to TV set, radio, computer or other electric equipment.
In locations with potentiallyexplosive atmospheres,obey all posted signs to turn off
wireless devices such as your phone or other cellular terminals. Areas with
potentiallyexplosive 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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2Product Concept
2.1. General Description
EG91 module is an embedded 4G wireless communication module with receive diversity. It supports LTE-
FDD/WCDMA/GSM wireless communication, and provides data connectivity on LTE-FDD, DC-HSDPA,
HSPA+, HSDPA, HSUPA, WCDMA, EDGE and GPRS networks. It can also provide voice functionality 1)
to meet customers’ specific application demands. The following table shows the frequency bands of EG91
series module.
Table 1: Frequency Bands of EG91 Series Module
1. 1) EG91 contains Telematics version and Data-only version. Telematics version supports voice
and data functions, while Data-only version only supports data function.
2. 2) GNSS function is optional.
Module
LTE Bands
(with Rx-diversity)
WCDMA
(with Rx-diversity)
GSM
GNSS 2)
EG91-E
FDD:
B1/B3/B7/B8/B20/B28A
B1/B8
900/1800MHz
Not supported
EG91-NA
FDD: B2/B4/B5/B12/B13
B2/B4/B5
Not supported
GPS, GLONASS,
BeiDou/Compass,
Galileo, QZSS
EG91-NS
FDD:
B2/B4/B5/B12/B13/B25/
B26
B2/B4/B5
Not supported
GPS, GLONASS,
BeiDou/Compass,
Galileo, QZSS
EG91-VX
FDD: B4/B13
Not supported
Not supported
GPS, GLONASS,
BeiDou/Compass,
Galileo, QZSS
EG91-EX
FDD:
B1/B3/B7/B8/B20/B28
B1/B8
900/1800MHz
GPS, GLONASS,
BeiDou/Compass,
Galileo, QZSS
NOTES

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With a compact profile of 29.0mm × 25.0mm × 2.3mm, EG91 can meet almost all requirements for M2M
applications such as automotive, smart metering, tracking system, security, router, wireless POS, mobile
computing device, PDA phone, tablet PC, etc.
EG91 is an SMD type module which can be embedded into applications through its 106 LGA pads.
EG91 is integrated with internet service protocols like TCP, UDP and PPP. Extended AT commands have
been developed for customers to use these internet service protocols easily.
2.2. Key Features
The following table describes the detailed features of EG91 module.
Table 2: Key Features of EG91 Module
Feature
Details
Power Supply
Supply voltage: 3.3V~4.3V
Typical supply voltage: 3.8V
Transmitting Power
Class 4 (33dBm±2dB) for EGSM900
Class 1 (30dBm±2dB) for DCS1800
Class E2 (27dBm±3dB) for EGSM900 8-PSK
Class E2 (26dBm±3dB) for DCS1800 8-PSK
Class 3 (24dBm+1/-3dB) for WCDMA bands
Class 3 (23dBm±2dB) for LTE-FDD bands
LTE Features
Support up to non-CA Cat 1 FDD
Support 1.4MHz~20MHz RF bandwidth
Support MIMO in DL direction
LTE-FDD: Max 10Mbps (DL), Max 5Mbps (UL)
UMTS Features
Support 3GPP R8 DC-HSDPA, HSPA+, HSDPA, HSUPA and WCDMA
Support QPSK, 16-QAM and 64-QAM modulation
DC-HSDPA: Max 42Mbps (DL)
HSUPA: Max 5.76Mbps (UL)
WCDMA: Max 384Kbps (DL), Max 384Kbps (UL)
GSM Features
R99:
CSD: 9.6kbps
GPRS:
Support GPRS multi-slot class 33 (33 by default)
Coding scheme: CS-1, CS-2, CS-3 and CS-4
Max 107Kbps (DL), Max 85.6Kbps (UL)
EDGE:

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Support EDGE multi-slot class 33 (33 by default)
Support GMSK and 8-PSK for different MCS (Modulation and Coding
Scheme)
Downlink coding schemes: CS 1-4 and MCS 1-9
Uplink coding schemes: CS 1-4 and MCS 1-9
Max 296Kbps (DL)/Max 236.8Kbps (UL)
Internet Protocol Features
Support TCP/UDP/PPP/FTP/HTTP/NTP/PING/QMI/NITZ/CMUX*/HTTPS*/
SMTP*/MMS*/FTPS*/SMTPS*/SSL*/FILE* protocols
Support PAP (Password Authentication Protocol) and CHAP (Challenge
Handshake Authentication Protocol) protocols which are usually used for
PPP connections
SMS
Text and PDU modes
Point-to-point MO and MT
SMS cell broadcast
SMS storage: ME by default
(U)SIM Interfaces
Support 1.8V and 3.0V (U)SIM cards
Audio Features
Support one digital audio interface: PCM interface
GSM: HR/FR/EFR/AMR/AMR-WB
WCDMA: AMR/AMR-WB
LTE: AMR/AMR-WB
Support echo cancellation and noise suppression
PCM Interface
Used for audio function with external codec
Support 16-bit linear data format
Support long frame synchronization and short frame synchronization
Support master and slave mode, but must be the master in long frame
synchronization
USB Interface
Compliant withUSB 2.0 specification (slave only); the data transfer rate can
reach up to 480Mbps
Used for AT command communication, data transmission, GNSS NMEA
sentences output, software debugging, firmware upgrade and voice over
USB*
Support USB serial drivers for: Windows 7/8/8.1/10, Windows CE
5.0/6.0/7.0*, Linux 2.6/3.x/4.1~4.14, Android 4.x/5.x/6.x/7.x/8.x/9.x, etc.
UART Interface
Main UART:
Used for AT command communication and data transmission
Baud rates reach up to 921600bps, 115200bps by default
Support RTS and CTS hardware flow control
Debug UART:
Used for Linux console and log output
115200bps baud rate
Rx-diversity
Support LTE/WCDMA Rx-diversity
GNSS Features
Gen8C Lite of Qualcomm

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Protocol: NMEA 0183
AT Commands
Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT
commands
Network Indication
NETLIGHT pin for network activity status indication
Antenna Interfaces
Including main antenna interface (ANT_MAIN), Rx-diversity antenna
(ANT_DIV) interface and GNSS antenna interface (ANT_GNSS) 1)
Physical Characteristics
Size: (29.0±0.15)mm × (25.0±0.15)mm × (2.3±0.2)mm
Package: LGA
Weight: approx. 3.8g
Temperature Range
Operation temperature range: -35°C ~ +75°C 2)
Extended temperature range: -40°C ~ +85°C 3)
Storage temperature range: -40°C ~ +90°C
Firmware Upgrade
USB interface or DFOTA*
RoHS
All hardware components are fully compliant with EU RoHS directive
1. 1) GNSS antenna interface is only supported on EG91-NA/-NS/-VX/-EX.
2. 2) Within operation temperature range, the module is 3GPP compliant.
3. 3) Within extended temperature range, the module remains the ability to establish and maintain a
voice, SMS, data transmission, emergency call, etc. There is no unrecoverablemalfunction. There
are also no effects on radio spectrum and no harm to radio network. Only one or more parameters
like Pout might reduce in their value and exceed the specified tolerances. When the temperature
returns to normal operation temperature levels, the module will meet 3GPP specifications again.
4. “*” means under development.
2.3. Functional Diagram
The following figure shows a block diagram of EG91 and illustrates the major functional parts.
Power management
Baseband
DDR+NAND flash
Radio frequency
Peripheral interfaces
NOTES

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Baseband
PMIC
Transceiver NAND
DDR2
SDRAM
PA
PAM Switch
ANT_MAIN ANT_DIV
VBAT_BB
VBAT_RF
PWRKEY
VDD_EXT USB PCM UARTI2C
RESET_N
19.2M
XO
STATUS
GPIOs
Control
IQ Control
Duplexer
SAW
Tx
PRx DRx
(U)SIM2 SPI (U)SIM1
SAW
LNA
ANT_GNSS 1)
SAW
GPS
Figure 1: Functional Diagram
1) GNSS antenna interface is only supported on EG91-NA/-NS/-VX/-EX.
2.4. Evaluation Board
Quectel provides a complete set of evaluation tools to facilitate the use and testing of EG91 module. The
evaluation tool kit includes the evaluation board (UMTS&LTE EVB), USB data cable, earphone, antenna
and other peripherals.
NOTE

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3Application Interfaces
3.1. General Description
EG91 is equipped with 62-pin 1.1mm pitch SMT pads plus 44-pin ground/reserved pads that can be
connected to customers’cellular application platforms. Sub-interfaces included in these pads are
described in detail in the following chapters:
Power supply
(U)SIM interfaces
USB interface
UART interfaces
PCM and I2C interfaces
SPI interface
Status indication
USB_BOOT interface

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EG91_Hardware_Design 18 / 93
3.2. Pin Assignment
The following figure shows the pin assignment of EG91 module.
NC
PCM_SYNC
PCM_CLK
PCM_DIN
PCM_DOUT
NC
NC
PWRKEY 1)
NC
RESET_N
RESERVED
1
2
3
4
5
6
7
11
12
13
14
15
16
17
18
50 51 52 53 54
55
58 59 60 61 62
USB_DM
AP_READY
STATUS
NETLIGHT
DBG_RXD
DBG_TXD
ADC0
RESERVED
SPI_CLK
SPI_MOSI
SPI_MISO
VDD_EXT
DTR
GND
USIM1_CLK
USIM1_DATA
USIM1_RST
USIM1_VDD
RI
DCD
CTS
TXD
RXD
VBAT_BB
VBAT_BB
USIM_GND
GND
31 30 29 28 27 26 23 22 21 20 19
10
9
USB_DP
USB_VBUS
NC
GND
NC
NC
RTS
I2C_SCL
I2C_SDA
8
49
48
47
46
45
44
43
40
41
42
39
38
37
36
35
34
33
32
24
57
56
GND
GND
ANT_MAIN
GND
GND
NC
VBAT_RF VBAT_RF
GND
GND
NC
GND
USIM1_PRESENCE
63
64
65
66
67
68
83
84
85
86
87
88
98
97
96
95
94
93
78
77
76
75
74
73
91 92
89 90
71 72
69 70
80 79
82 81
100 99
102 101
POWER USB UART (U)SIM OTHERS
GND NC
PCM ANT
25
USIM2_PRESENCE
USIM2_CLK
USIM2_RST
USIM2_DATA
USIM2_VDD
SPI
USB_BOOT
103
104 105
106
ANT_DIV(EG91-NA/-NS/-VX/-EX)
ANT_GNSS (EG91-NA/-NS/-VX/-EX)
RESERVED
RESERVED (Pin 49 onEG91-E)
ANT_DIV(EG91-E)
Figure 2: Pin Assignment (Top View)

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1. 1) PWRKEY output voltage is 0.8V because of the diode drop in the Qualcomm chipset.
2. Keep all RESERVED pins and unused pins unconnected.
3. GND pads should be connected to ground in the design.
4. Definition of pin 49 and 56 are different among EG91-E/-NS/-VX/-EX and EG91-NA. For more
details, please refer to Table 4.
3.3. Pin Description
The following tables show the pin definition and description of EG91.
Table 3: IO Parameters Definition
Table 4: Pin Description
Type
Description
AI
Analog input
AO
Analog output
DI
Digital input
DO
Digital output
IO
Bidirectional
OD
Open drain
PI
Power input
PO
Power output
Power Supply
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
VBAT_BB
32, 33
PI
Power supply for
module’s baseband
part
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
It must be able to
provide sufficient
current up to 0.8A.
NOTES