Quectel UC20 User manual

UC20 Hardware Design
UMTS/HSPA Module Series
Rev. UC20_Hardware_Design_V1.2
Date: 2014-01-13
www.quectel.com

UMTS/HSPA Module Series
UC20 Hardware Design
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About the Document
History
Revision
Date
Author
Description
1.0
2013-07-17
Mountain ZHOU
Initial
1.1
2013-08-29
Mountain ZHOU
1. Updated USB driver information.
2. Added GNSS contents in Chapter 4.
3. Added GNSS current consumption.
4. Updated GNSS antenna requirements.
5. Released USIM_PRESENCE function.
1.2
2014-01-13
Mountain ZHOU
1. Added UC20-G information.
2. Added AMR-WB feature.
3. Added USB upgrade test points’diagram.
4. Added reference design of transistor circuit on
UART interface.
5. Deleted debug function of Debug UART
interface.
6. Released AP_READY, UART upgrade
function and Rx-diversity function.
7. Modified UC20-A frequency bands.
8. Modified W_DISABLE# definition.
9. Modified USIM pin’s electrical characteristics.
10. Modified GNSS sensitivity definition.
11. Modified turning on timing figure.
12. Updated the sleep application in Chapter
3.5.1 and airplane mode in Chapter 3.5.2.
13. Updated I2C pins definition.
14. Updated current consumption.

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Contents
About the Document................................................................................................................................... 2
Contents....................................................................................................................................................... 3
Table Index................................................................................................................................................... 6
Figure Index ................................................................................................................................................. 7
1Introduction .......................................................................................................................................... 9
1.1. Safety Information.................................................................................................................... 10
2Product Concept ................................................................................................................................ 11
2.1. General Description................................................................................................................. 11
2.2. Directives and Standards......................................................................................................... 11
2.2.1. FCC Statement............................................................................................................... 12
2.2.2. FCC Radiation Exposure Statement.............................................................................. 12
2.3. Key Features ........................................................................................................................... 12
2.4. Functional Diagram ................................................................................................................. 15
2.5. Evaluation Board ..................................................................................................................... 16
3Application Interface ......................................................................................................................... 17
3.1. General Description................................................................................................................. 17
3.2. Pin Assignment........................................................................................................................ 18
3.3. Pin Description......................................................................................................................... 19
3.4. Operating Modes ..................................................................................................................... 25
3.5. Power Saving........................................................................................................................... 25
3.5.1. Sleep Mode .................................................................................................................... 25
3.5.1.1. UART Application................................................................................................. 26
3.5.1.2. USB Application with Suspend Function ............................................................. 26
3.5.1.3. USB Application without Suspend Function ........................................................ 27
3.5.2. Airplane Mode ................................................................................................................ 28
3.6. Power Supply........................................................................................................................... 29
3.6.1. Power Supply Pins ......................................................................................................... 29
3.6.2. Decrease Voltage Drop.................................................................................................. 29
3.6.3. Reference Design for Power Supply.............................................................................. 30
3.6.4. Monitor the Power Supply.............................................................................................. 31
3.7. Turn on and off Scenarios ....................................................................................................... 31
3.7.1. Turn on Module Using the PWRKEY............................................................................. 31
3.7.2. Turn off Module .............................................................................................................. 33
3.7.2.1. Turn off Module Using the PWRKEY Pin............................................................. 33
3.7.2.2. Turn off Module Using AT Command................................................................... 34
3.7.2.3. Automatic Shutdown ............................................................................................ 34
3.8. Reset the Module..................................................................................................................... 35
3.9. RTC Backup............................................................................................................................. 37

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3.10. UART Interface ........................................................................................................................ 38
3.11. USIM Card Interface................................................................................................................ 42
3.11.1. USIM Card Application................................................................................................... 42
3.11.2. Design Considerations for USIM Connector.................................................................. 44
3.12. USB Interface .......................................................................................................................... 46
3.13. PCM and I2C Interface ............................................................................................................ 47
3.14. ADC Function .......................................................................................................................... 50
3.15. Network Status Indication ........................................................................................................ 51
3.16. Operating Status Indication ..................................................................................................... 52
3.16.1. STATUS.......................................................................................................................... 52
3.16.2. SLEEP_IND.................................................................................................................... 53
3.17. Behavior of the RI.................................................................................................................... 54
4GNSS Receiver................................................................................................................................... 55
4.1. General Description................................................................................................................. 55
4.2. GNSS Performance................................................................................................................. 56
4.3. Layout Guideline...................................................................................................................... 57
5Antenna Interface............................................................................................................................... 58
5.1. UMTS Antenna Interface ......................................................................................................... 58
5.1.1. Pin Definition .................................................................................................................. 58
5.1.2. Operating Frequency ..................................................................................................... 58
5.1.3. Reference Design .......................................................................................................... 58
5.2. GNSS Antenna Interface ......................................................................................................... 59
5.2.1. Reference Design for Passive Antenna ......................................................................... 60
5.2.2. Reference Design for Active Antenna ............................................................................ 61
5.3. Antenna Installation ................................................................................................................. 61
5.3.1. Antenna Requirement .................................................................................................... 61
5.3.2. Install the Antenna with RF Connector .......................................................................... 62
6Electrical, Reliability and Radio Characteristics ............................................................................ 64
6.1. Absolute Maximum Ratings..................................................................................................... 64
6.2. Power Supply Ratings ............................................................................................................. 65
6.3. Operating Temperature............................................................................................................ 65
6.4. Current Consumption .............................................................................................................. 65
6.5. RF Output Power..................................................................................................................... 67
6.6. RF Receiving Sensitivity.......................................................................................................... 67
6.7. Electrostatic Discharge............................................................................................................ 67
7Mechanical Dimensions .................................................................................................................... 69
7.1. Mechanical Dimensions of the Module.................................................................................... 69
7.2. Footprint of Recommendation ................................................................................................. 72
7.3. Top View of the Module ........................................................................................................... 73
7.4. Bottom View of the Module...................................................................................................... 73
8Storage and Manufacturing .............................................................................................................. 74
8.1. Storage..................................................................................................................................... 74

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8.2. Manufacturing and Welding..................................................................................................... 74
8.3. Packaging ................................................................................................................................ 75
9Appendix A Reference....................................................................................................................... 77

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Table Index
TABLE 1: UC20 SERIES FREQUENCY BANDS ...............................................................................................11
TABLE 2: UC20 KEY FEATURES ..................................................................................................................... 13
TABLE 3: IO PARAMETERS DEFINITION........................................................................................................ 19
TABLE 4: PIN DESCRIPTION ........................................................................................................................... 19
TABLE 5: OVERVIEW OF OPERATING MODES............................................................................................. 25
TABLE 6: VBAT AND GND PINS....................................................................................................................... 29
TABLE 7: PWRKEY PIN DESCRIPTION .......................................................................................................... 31
TABLE 8: RESET_N PIN DESCRIPTION ......................................................................................................... 35
TABLE 9: PIN DEFINITION OF THE MAIN UART INTERFACE....................................................................... 38
TABLE 10: PIN DEFINITION OF THE DEBUG UART INTERFACE ................................................................. 39
TABLE 11: LOGIC LEVELS OF DIGITAL I/O .................................................................................................... 39
TABLE 12: PIN DEFINITION OF THE USIM INTERFACE ............................................................................... 42
TABLE 13: PIN DESCRIPTION OF MOLEX USIM CONNECTOR................................................................... 44
TABLE 14: PIN DESCRIPTION OF AMPHENOL USIM CONNECTOR ........................................................... 45
TABLE 15: USB PIN DESCRIPTION ................................................................................................................ 46
TABLE 16: PIN DEFINITION OF PCM AND I2C INTERFACE.......................................................................... 49
TABLE 17: PIN DEFINITION OF THE ADC ...................................................................................................... 50
TABLE 18: CHARACTERISTIC OF THE ADC .................................................................................................. 51
TABLE 19: PIN DEFINITION OF NETWORK INDICATOR............................................................................... 51
TABLE 20: WORKING STATE OF THE NETWORK INDICATOR..................................................................... 51
TABLE 21: PIN DEFINITION OF STATUS ........................................................................................................ 52
TABLE 22: PIN DEFINITION OF SLEEP_IND .................................................................................................. 53
TABLE 23: BEHAVIOR OF THE RI ................................................................................................................... 54
TABLE 24: GNSS PERFORMANCE ................................................................................................................. 56
TABLE 25: PIN DEFINITION OF THE RF ANTENNA ....................................................................................... 58
TABLE 26: THE MODULE OPERATING FREQUENCIES................................................................................ 58
TABLE 27: PIN DEFINITION OF GNSS ANTENNA.......................................................................................... 59
TABLE 28: GNSS FREQUENCY....................................................................................................................... 60
TABLE 29: ANTENNA REQUIREMENTS.......................................................................................................... 62
TABLE 30: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 64
TABLE 31: THE MODULE POWER SUPPLY RATINGS .................................................................................. 65
TABLE 32: OPERATING TEMPERATURE........................................................................................................ 65
TABLE 33: THE MODULE CURRENT CONSUMPTION .................................................................................. 66
TABLE 34: CONDUCTED RF OUTPUT POWER ............................................................................................. 67
TABLE 35: CONDUCTED RF RECEIVING SENSITIVITY................................................................................ 67
TABLE 36: ELECTROSTATICS DISCHARGE CHARACTERISTICS ............................................................... 68
TABLE 37: RELATED DOCUMENTS ................................................................................................................ 77
TABLE 38: TERMS AND ABBREVIATIONS...................................................................................................... 77

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Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM........................................................................................................ 16
FIGURE 2: PIN ASSIGNMENT (TOP VIEW)............................................................................................. 18
FIGURE 3: UART SLEEP APPLICATION.................................................................................................. 26
FIGURE 4: USB APPLICATION WITH SUSPEND FUNCTION................................................................ 27
FIGURE 5: USB SLEEP APPLICATION WITHOUT SUSPEND FUNCTION............................................ 28
FIGURE 6: STAR STRUCTURE OF THE POWER SUPPLY.................................................................... 30
FIGURE 7: REFERENCE CIRCUIT OF POWER SUPPLY....................................................................... 30
FIGURE 8: TURN ON THE MODULE USING DRIVING CIRCUIT ........................................................... 31
FIGURE 9: TURN ON THE MODULE USING KEYSTROKE.................................................................... 32
FIGURE 10: TIMING OF TURNING ON MODULE ................................................................................... 33
FIGURE 11: TIMING OF TURNING OFF MODULE.................................................................................. 34
FIGURE 12: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT .............................. 36
FIGURE 13: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON .............................................. 36
FIGURE 14: TIMING OF RESETTING MODULE...................................................................................... 36
FIGURE 15: RTC SUPPLY FROM NON-CHARGEABLE BATTERY........................................................ 37
FIGURE 16: RTC SUPPLY FROM RECHARGEABLE BATTERY ............................................................ 37
FIGURE 17: RTC SUPPLY FROM CAPACITOR....................................................................................... 38
FIGURE 18: REFERENCE CIRCUIT WITH TRANSLATOR CHIP............................................................ 40
FIGURE 19: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT ...................................................... 40
FIGURE 20: RS232 LEVEL MATCH CIRCUIT .......................................................................................... 41
FIGURE 21: REFERENCE CIRCUIT OF DEBUG UART WITH LEVEL TRANSLATOR .......................... 41
FIGURE 22: REFERENCE CIRCUIT OF THE 8 PIN USIM CARD........................................................... 42
FIGURE 23: REFERENCE CIRCUIT OF THE 6 PIN USIM CARD........................................................... 43
FIGURE 24: MOLEX 91228 USIM CONNECTOR .................................................................................... 44
FIGURE 25: AMPHENOL C707 10M006 512 2 USIM CARD CONNECTOR........................................... 45
FIGURE 26: REFERENCE CIRCUIT OF USB APPLICATION ................................................................. 46
FIGURE 27: TEST POINTS OF FIRMWARE UPGRADE ......................................................................... 47
FIGURE 28: PRIMARY MODE TIMING..................................................................................................... 48
FIGURE 29: AUXILIARY MODE TIMING................................................................................................... 49
FIGURE 30: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC ............................ 50
FIGURE 31: REFERENCE CIRCUIT OF THE NETWORK INDICATOR.................................................. 52
FIGURE 32: REFERENCE CIRCUIT OF THE STATUS............................................................................ 53
FIGURE 33: REFERENCE CIRCUIT OF THE SLEEP_IND ..................................................................... 54
FIGURE 34: REFERENCE CIRCUIT OF ANTENNA INTERFACE ........................................................... 59
FIGURE 35: REFERENCE CIRCUIT OF GNSS PASSIVE ANTENNA..................................................... 60
FIGURE 36: REFERENCE CIRCUIT OF GNSS ACTIVE ANTENNA ....................................................... 61
FIGURE 37: DIMENSIONS OF THE UF.L-R-SMT CONNECTOR (UNIT: MM) ........................................ 62
FIGURE 38: MECHANICALS OF UF.L-LP CONNECTORS ..................................................................... 63
FIGURE 39: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ................................................... 63
FIGURE 40: UC20 TOP AND SIDE DIMENSIONS ................................................................................... 69
FIGURE 41: UC20 BOTTOM DIMENSIONS (BOTTOM VIEW)................................................................ 70

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FIGURE 42: BOTTOM PADS DIMENSIONS (BOTTOM VIEW) ............................................................... 71
FIGURE 43: RECOMMENDED FOOTPRINT (TOP VIEW) ...................................................................... 72
FIGURE 44: TOP VIEW OF THE MODULE .............................................................................................. 73
FIGURE 45: BOTTOM VIEW OF THE MODULE ...................................................................................... 73
FIGURE 46: LIQUIDS TEMPERATURE .................................................................................................... 75
FIGURE 47: CARRIER TAPE .................................................................................................................... 76

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1Introduction
This document defines the UC20 module and describes its hardware interface which are connected with
your application and the air interface.
This document can help you quickly understand module interface specifications, electrical and
mechanical details. Associated with application notes and user guide, you can use UC20 module to
design and set up mobile applications easily.