Quectel EG21-G Supplement

EG21-G
Hardware Design
LTE Module Series
Rev. EG21-G_Hardware_Design_V1.0
Date: 2019-03-12
Status: Released
www.quectel.com

LTE Module Series
EG21-G Hardware Design
EG21-G_Hardware_Design 1 / 100
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About the Document
History
Revision
Date
Author
Description
1.0
2019-03-11
Lorry XU/
Harry HUANG
Initial

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Contents
About the Document................................................................................................................................ 2
Contents.................................................................................................................................................... 3
Table Index ............................................................................................................................................... 5
Figure Index.............................................................................................................................................. 7
1Introduction....................................................................................................................................... 9
1.1. Safety Information................................................................................................................. 10
2Product Concept ............................................................................................................................. 11
2.1. General Description ...............................................................................................................11
2.2. Key Features.........................................................................................................................12
2.3. Functional Diagram............................................................................................................... 14
2.4. Evaluation Board................................................................................................................... 15
3Application Interfaces..................................................................................................................... 16
3.1. General Description .............................................................................................................. 16
3.2. Pin Assignment ..................................................................................................................... 17
3.3. Pin Description......................................................................................................................18
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 Suspension/Resume and RI Function .....................29
3.5.1.4. USB Application without USB Suspension Function ..........................................30
3.5.2. Airplane Mode.............................................................................................................. 30
3.6. Power Supply........................................................................................................................31
3.6.1. Power Supply Pins.......................................................................................................31
3.6.2. Decrease Voltage Drop................................................................................................ 32
3.6.3. Reference Design for Power Supply............................................................................33
3.6.4. Monitor the Power Supply............................................................................................ 33
3.7. Power-on and off Scenarios..................................................................................................34
3.7.1. Turn on Module Using the PWRKEY ........................................................................... 34
3.7.2. Turn off Module............................................................................................................ 35
3.7.2.1. Turn off Module Using the PWRKEY Pin ........................................................... 36
3.7.2.2. Turn off Module Using AT Command .................................................................36
3.8. Reset the Module..................................................................................................................36
3.9. (U)SIM Interface.................................................................................................................... 38
3.10. USB Interface........................................................................................................................40
3.11. UART Interfaces.................................................................................................................... 42
3.12. PCM and I2C Interfaces........................................................................................................ 44
3.13. SD Card Interface ................................................................................................................. 46
3.14. ADC Interfaces...................................................................................................................... 48
3.15. Network Status Indication .....................................................................................................49
3.16. STATUS ................................................................................................................................ 50

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3.17. Behaviors of RI .....................................................................................................................51
3.18. USB_BOOT Interface............................................................................................................51
4GNSS Receiver................................................................................................................................ 54
4.1. General Description .............................................................................................................. 54
4.2. GNSS Performance .............................................................................................................. 54
4.3. Layout Guidelines ................................................................................................................. 55
5Antenna Interfaces.......................................................................................................................... 56
5.1. Main/Rx-diversity Antenna Interfaces.................................................................................... 56
5.1.1. Pin Definition................................................................................................................ 56
5.1.2. Operating Frequency ...................................................................................................56
5.1.3. Reference Design of RF Antenna Interface ................................................................. 58
5.1.4. Reference Design of RF Layout................................................................................... 58
5.2. GNSS Antenna Interface....................................................................................................... 60
5.3. Antenna Installation ..............................................................................................................61
5.3.1. Antenna Requirement..................................................................................................61
5.3.2. Recommended RF Connector for Antenna Installation................................................62
6Electrical, Reliability and Radio Characteristics .......................................................................... 65
6.1. Absolute Maximum Ratings .................................................................................................. 65
6.2. Power Supply Ratings........................................................................................................... 66
6.3. Operation and Storage Temperatures ...................................................................................66
6.4. Current Consumption............................................................................................................ 67
6.5. RF Output Power .................................................................................................................. 72
6.6. RF Receiving Sensitivity .......................................................................................................72
6.7. Electrostatic Discharge .........................................................................................................74
6.8. Thermal Consideration.......................................................................................................... 74
7Mechanical Dimensions.................................................................................................................. 77
7.1. Mechanical Dimensions of the Module..................................................................................77
7.2. Recommended Footprint....................................................................................................... 79
7.3. Design Effect Drawings of the Module ..................................................................................80
8Storage, Manufacturing and Packaging........................................................................................ 81
8.1. Storage .................................................................................................................................81
8.2. Manufacturing and Soldering ................................................................................................82
8.3. Packaging .............................................................................................................................83
9Appendix A References.................................................................................................................. 85
10 Appendix B GPRS Coding Schemes............................................................................................. 89
11 Appendix C GPRS Multi-slot Classes............................................................................................ 90
12 Appendix D EDGE Modulation and Coding Schemes.................................................................. 92

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Table Index
TABLE 1: FREQUENCY BANDS OF EG21-G MODULE...................................................................................11
TABLE 2: KEY FEATURES OF EG21-G MODULE........................................................................................... 12
TABLE 3: I/O PARAMETERS DEFINITION....................................................................................................... 18
TABLE 4: PIN DESCRIPTION........................................................................................................................... 18
TABLE 5: OVERVIEW OF OPERATING MODES............................................................................................. 27
TABLE 6: VBAT AND GND PINS....................................................................................................................... 31
TABLE 7: PIN DEFINITION OF PWRKEY ........................................................................................................ 34
TABLE 8: RESET_N PIN DESCRIPTION ......................................................................................................... 37
TABLE 9: PIN DEFINITION OF (U)SIM INTERFACE ....................................................................................... 38
TABLE 10: PIN DESCRIPTION OF USB INTERFACE ..................................................................................... 40
TABLE 11: PIN DEFINITION OF MAIN UART INTERFACE ............................................................................. 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 ....................................................................... 45
TABLE 15: PIN DEFINITION OF SD CARD INTERFACE ................................................................................ 47
TABLE 18: PIN DEFINITION OF ADC INTERFACES....................................................................................... 48
TABLE 19: CHARACTERISTIC OF ADC .......................................................................................................... 49
TABLE 20: PIN DEFINITION OF NETWORK CONNECTION STATUS/ACTIVITY INDICATOR...................... 49
TABLE 21: WORKING STATE OF THE NETWORK CONNECTION STATUS/ACTIVITY INDICATOR ........... 49
TABLE 22: PIN DEFINITION OF STATUS ........................................................................................................ 50
TABLE 23: BEHAVIORS OF RI ......................................................................................................................... 51
TABLE 24: PIN DEFINITION OF USB_BOOT INTERFACE ............................................................................. 52
TABLE 25: GNSS PERFORMANCE ................................................................................................................. 54
TABLE 26: PIN DEFINITION OF THE RF ANTENNA....................................................................................... 56
TABLE 27: MODULE OPERATING FREQUENCIES........................................................................................ 56
TABLE 28: PIN DEFINITION OF GNSS ANTENNA INTERFACE..................................................................... 60
TABLE 29: GNSS FREQUENCY....................................................................................................................... 61
TABLE 30: ANTENNA REQUIREMENTS.......................................................................................................... 62
TABLE 31: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 65
TABLE 32: THE MODULE POWER SUPPLY RATINGS .................................................................................. 66
TABLE 33: OPERATION AND STORAGE TEMPERATURES .......................................................................... 66
TABLE 34: EG21-G CURRENT CONSUMPTION............................................................................................. 67
TABLE 35: GNSS CURRENT CONSUMPTION OF EG21-G MODULE........................................................... 71
TABLE 36: RF OUTPUT POWER ..................................................................................................................... 72
TABLE 37: EG21-G CONDUCTED RF RECEIVING SENSITIVITY ................................................................. 72
TABLE 38: ELECTROSTATICS DISCHARGE CHARACTERISTICS (25ºC, 45% RELATIVE HUMIDITY)...... 74
TABLE 39: RECOMMENDED THERMAL PROFILE PARAMETERS ............................................................... 82
TABLE 40: RELATED DOCUMENTS................................................................................................................ 85
TABLE 41: TERMS AND ABBREVIATIONS ...................................................................................................... 85
TABLE 42: DESCRIPTION OF DIFFERENT CODING SCHEMES .................................................................. 89
TABLE 43: GPRS MULTI-SLOT CLASSES ...................................................................................................... 90

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TABLE 44: EDGE MODULATION AND CODING SCHEMES........................................................................... 92

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Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 15
FIGURE 2: PIN ASSIGNMENT (TOP VIEW) .................................................................................................... 17
FIGURE 3: SLEEP MODE APPLICATION VIA UART....................................................................................... 28
FIGURE 4: SLEEP MODE APPLICATION WITH USB REMOTE WAKEUP .................................................... 29
FIGURE 5: SLEEP MODE APPLICATION WITH RI ......................................................................................... 30
FIGURE 6: SLEEP MODE APPLICATION WITHOUT SUSPENSION FUNCTION.......................................... 30
FIGURE 7: POWER SUPPLY LIMITS DURING BURST TRANSMISSION...................................................... 32
FIGURE 8: STAR STRUCTURE OF THE POWER SUPPLY............................................................................ 33
FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY .............................................................................. 33
FIGURE 10: TURN ON THE MODULE BY USING DRIVING CIRCUIT ........................................................... 34
FIGURE 11: TURN ON THE MODULE BY USING KEYSTROKE.................................................................... 35
FIGURE 12: POWER-ON SCENARIO OF MODULE ....................................................................................... 35
FIGURE 13: POWER-OFF SCENARIO OF MODULE...................................................................................... 36
FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT ...................................... 37
FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON ...................................................... 37
FIGURE 16: TIMING OF RESETTING MODULE ............................................................................................. 38
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 APPLICATION ......................................................................... 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 SD CARD......................................................................................... 47
FIGURE 29: REFERENCE CIRCUIT OF THE NETWORK INDICATOR.......................................................... 50
FIGURE 30: REFERENCE CIRCUITS OF STATUS ......................................................................................... 51
FIGURE 31: REFERENCE CIRCUIT OF USB_BOOT INTERFACE ................................................................ 52
FIGURE 32: TIMING SEQUENCE FOR ENTERING INTO EMERGENCY DOWNLOAD MODE.................... 53
FIGURE 32: REFERENCE CIRCUIT OF RF ANTENNA INTERFACE ............................................................. 58
FIGURE 33: MICROSTRIP DESIGN ON A 2-LAYER PCB............................................................................... 59
FIGURE 34: COPLANAR WAVEGUIDE DESIGN ON A 2-LAYER PCB........................................................... 59
FIGURE 35: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND)
................................................................................................................................................................... 59
FIGURE 36: COPLANAR WAVEGUIDE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE GROUND)
................................................................................................................................................................... 60
FIGURE 37: REFERENCE CIRCUIT OF GNSS ANTENNA............................................................................. 61
FIGURE 38: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM)................................................ 63
FIGURE 39: MECHANICALS OF U.FL-LP CONNECTORS............................................................................. 63
FIGURE 40: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 64

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FIGURE 41: REFERENCED HEATSINK DESIGN (HEATSINK AT THE TOP OF THE MODULE) .................. 75
FIGURE 42: REFERENCED HEATSINK DESIGN (HEATSINK AT THE BACKSIDE OF CUSTOMERS’ PCB)
................................................................................................................................................................... 75
FIGURE 43: MODULE TOP AND SIDE DIMENSIONS..................................................................................... 77
FIGURE 44: MODULE BOTTOM DIMENSIONS (BOTTOM VIEW) ................................................................. 78
FIGURE 45: RECOMMENDED FOOTPRINT (TOP VIEW) .............................................................................. 79
FIGURE 46: TOP VIEW OF THE MODULE...................................................................................................... 80
FIGURE 47: BOTTOM VIEW OF THE MODULE.............................................................................................. 80
FIGURE 48: REFLOW SOLDERING THERMAL PROFILE.............................................................................. 82
FIGURE 49: TAPE AND REEL SPECIFICATIONS ........................................................................................... 84
FIGURE 51: TAPE AND REEL DIRECTIONS ................................................................................................... 84

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1Introduction
This document defines EG21-G module, and describes its air interfaces and hardware interfaces 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 EG21-G module. To facilitate its application in
different fields, relevant reference design is also provided for customers’ reference. Associated with
application note and user guide, customers can use the module to design and set up mobile applications
easily.