Quectel Wireless Solutions 201312UC20 UMTS/HSPA+ Module User Manual

Quectel Wireless Solutions Company Limited UMTS/HSPA+ Module

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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
Our aim is to provide customers with timely and comprehensive service. For any
assistance, please contact our company headquarters:
Quectel Wireless Solutions Co., Ltd.
Office 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233
Tel: +86 21 5108 6236
Mail: info@quectel.com
Or our local office, for more information, please visit:
http://www.quectel.com/support/salesupport.aspx
For technical support, to report documentation errors, please visit:
http://www.quectel.com/support/techsupport.aspx
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. 2014. All rights reserved.
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About the Document
History
Revision
Date
Author
Description
1.0
2013-07-17
Mountain ZHOU
Initial
Mountain ZHOU
1.
2.
3.
4.
5.
Updated USB driver information.
Added GNSS contents in Chapter 4.
Added GNSS current consumption.
Updated GNSS antenna requirements.
Released USIM_PRESENCE function.
1.
2.
3.
4.
Added UC20-G information.
Added AMR-WB feature.
Added USB upgrade test points’ diagram.
Added reference design of transistor circuit on
UART interface.
Deleted debug function of Debug UART
interface.
Released AP_READY, UART upgrade
function and Rx-diversity function.
Modified UC20-A frequency bands.
Modified W_DISABLE# definition.
Modified USIM pin’s electrical characteristics.
Modified GNSS sensitivity definition.
Modified turning on timing figure.
Updated the sleep application in Chapter
3.5.1 and airplane mode in Chapter 3.5.2.
Updated I2C pins definition.
Updated current consumption.
1.1
2013-08-29
5.
6.
1.2
2014-01-13
Mountain ZHOU
7.
8.
9.
10.
11.
12.
13.
14.
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Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 6
Figure Index ................................................................................................................................................. 7
Introduction .......................................................................................................................................... 9
1.1.
Safety Information.................................................................................................................... 10
Product 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
Application 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
GNSS Receiver ................................................................................................................................... 55
4.1.
General Description ................................................................................................................. 55
4.2.
GNSS Performance ................................................................................................................. 56
4.3.
Layout Guideline ...................................................................................................................... 57
Antenna 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
Electrical, 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
Mechanical 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
Storage and Manufacturing .............................................................................................................. 74
8.1.
Storage..................................................................................................................................... 74
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8.2.
8.3.
Manufacturing and Welding ..................................................................................................... 74
Packaging ................................................................................................................................ 75
Appendix 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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Introduction
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.
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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 UC20 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 does not take on any liability
for customer 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) cause 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
switched off. The operation of wireless appliances in an aircraft is forbidden 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 or clinics or other health care
facilities. These requests are desinged to prevent possible interference with
sentitive medical equipment.
GSM cellular terminals or mobiles operate over radio frequency signal and cellular
network and cannot be guaranteed to connect in all conditions, for example no
mobile fee or 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 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 exposive atmospheres including 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.
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Product Concept
2.1. General Description
UC20 is an embedded HSPA+ engine with Rx-diversity. Its UMTS-based modem provides data
connectivity on HSPA+, HSDPA, HSUPA, WCDMA, networks. It can also provide GPS/GLONASS and
voice functionality for customers’ specific application. UC20 offers a maximum data rate of 14.4Mbps on
downlink and 5.76Mbps on uplink in HSPA+/HSPA mode.
Table 1: UC20 Series Frequency Bands
Module
GSM
850
EGSM
900
DCS
1800
PCS UMTS
1900 800
UC20
UMTS
850

UMTS
900
UMTS
1900

UMTS
2100
Rxdiversity

GNSS

With a tiny profile of 32.0mm × 29.0mm × 2.5mm, UC20 can meet almost all requirements for M2M
application such as automotive, metering, tracking system, security solutions, routers, wireless POS,
mobile computing devices, PDA phone and tablet PC, etc..
UC20 is an SMD type module, which can be embedded in application through its 112-pin pads including
72 LCC signal pads and 40 other pads.
UC20 is integrated with internet service protocols like TCP/UDP and PPP. Extended AT commands have
been developed for customer to use these internet service protocols easily.
2.2. Directives and Standards
The UC20 module is designed to comply with the FCC statements. FCC ID: XMR-201312UC20
The Host system using UC20, should have label indicated FCC ID: XMR-201312UC20.
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2.2.1. FCC Statement
1. This device complies with Part 15 of the FCC rules. Operation is subject to the following conditions:
a) This device may not cause harmful interference.
b) This device must accept any interference received, including interference that may cause undesired
operation.
2. Changes or modifications not expressly approved by the party responsible for compliance could
void the user’s authority to operate the equipment.
2.2.2. FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This equipment should be installed and operated with minimum distance 20cm between the radiator and
your body as well as kept minimum 20cm from radio antenna depending on the Mobile status of this
module usage. This module should NOT be installed and operating simultaneously with other radio.
The manual of the host system, which uses UC20, must include RF exposure warning statement to
advice user should keep minimum 20cm from the radio antenna of UC20 module depending on the
Mobile status.
Note: If a portable device (such as PDA) uses UC20 module, the device needs to do permissive change
and SAR testing.
The following list of antenna is indicating the maximum permissible antenna gain.
Part Number
Frequency
Range (MHz)
Peak Gain
(XZ-V)
Average Gain
(XZ-V)
VSWR
Impedance
3R007A
UMTS1900:1850~1990
UMTS850:824-894
1 dBi typ.
1 dBi typ.
3 max
50Ω
2.3. Key Features
The following table describes the detailed features of UC20 module.
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Table 2: UC20 Key Features
Feature
Details
Power Supply
Supply voltage: 3.4V~4.3V
Typical supply voltage: 3.8V
UC20-A: UMTS850/1900
Frequency Bands
HSPA R6: Max 14.4Mbps (DL)/Max 5.76Mbps (UL)
UMTS R99: Max 384kbps (DL)/Max 384kbps (UL)
Transmission Data
CSD: 14.4kbps
Transmitting Power
Class 3 (22.5dBm+1/-1dB) for UMTS 850/1900/
HSPA and UMTS Features
HSPA data rate is corresponded with 3GPP R6. 14.4Mbps on downlink
and 5.76Mbps on uplink.
WCDMA data rate is corresponded with 3GPP R99/R4. 384kbps on
downlink and 384kbps on uplink.
Support both 16-QAM and QPSK modulation.
Internet Protocol Features
Support TCP/PPP/UDP protocols
Support the protocols PAP (Password Authentication Protocol) and
CHAP (Challenge Handshake Authentication Protocol) usually used
for PPP connections.
SMS
Text and PDU mode
Point to point MO and MT
SMS cell broadcast
SMS storage: ME by default
USIM Interface
Support USIM/SIM card: 1.8V, 3.0V
Support one digital audio interface: PCM interface
Audio Features
WCDMA: AMR/AMR-WB
Echo cancellation and noise suppression
PCM Interface
Used for audio function with external codec.
Support 8-bit A-law, μ-law and 16-bit linear data formats.
Support long frame sync and short frame sync.
Support master and slave mode, but must be the master in long frame
sync.
UART Interface
Support two UART interfaces: main UART interface and debug UART
interface
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Main UART interface:
 Seven lines on main UART interface
 Support RTS and CTS hardware flow control
 Baud rate can reach up to 921600bps, 115200bps by default
 Used for AT command, data transmission or firmware upgrade
 Multiplexing function
Debug UART interface:
 Two lines on debug UART interface: DBG_TXD and DBG_RXD
 Can be used for GNSS NMEA sentences output
USB Interface
Compliant with USB 2.0 specification (slave only), the data transfer
rate can reach up to 480Mbps.
Used for AT command communication, data transmission, GNSS
NMEA output, software debug and firmware upgrade.
USB Driver: Windows XP, Windows Vista, Windows 7, Windows 8,
Windows CE5.0/6.0, Linux 2.6/3.0, Android 2.3/4.0.
Rx-diversity
Support UMTS Rx-diversity
GNSS Features
Gen8 of Qualcomm GNSS engine (GPS and GLONASS)
Protocol: NMEA 0183
AT Commands
Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT
commands.
Real Time Clock
Implemented
Network Indication
Two pins including NET_MODE and NET_STATUS to indicate
network connectivity status.
Antenna Interface
Include main UMTS antenna, UMTS diversity antenna, GNSS antenna
(passive).
Physical Characteristics
Size: 32.0±0.15 × 29.0±0.15 × 2.5±0.2mm
Weight: approx. 4.9g
Temperature Range
Normal operation: -35°C ~ +75°C
Restricted operation: -40°C ~ -35°C and +75°C ~ +85°C 1)
Storage temperature: -45°C ~ +90°C
Firmware Upgrade
USB interface (by default) or main UART interface.
RoHS
All hardware components are fully compliant with EU RoHS directive.
NOTE
“1)” means when the module works within this temperature range, RF performance might degrade. For
example, the frequency error or the phase error would increase.
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2.4. Functional Diagram
The following figure shows a block diagram of UC20 and illustrates the major functional parts.





Power management
Baseband
DDR+NAND flash
Radio frequency
Peripheral interface
--UART interface
--USIM card interface
--USB interface
--PCM interface
--ADC interface
--Status indication
--Control interface
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ANT_GNSS
RF
Switch
GSM
VBAT_RF
PCM
WAKEUP_IN
W_DISABLE#
RF
Switch
Baseband
RF Transceiver
GNSS Receiver
UART
USB
VBAT_BB
VDD_EXT
VDD_2V85
RESET_N
ANT_DIV
DDR RAM/
NAND Flash
SLEEP_IND
PWRKEY
ANT_MAIN
UMTS
Power
Management Unit
ADC
USIM
STATUS
VRTC
19.2MHz
32kHz
Figure 1: Functional Diagram
2.5. Evaluation Board
In order to help you to develop applications with UC20, Quectel supplies an evaluation board (EVB),
RS-232 to USB cable, USB data cable, power adapter, earphone, antenna and other peripherals to
control or test the module. For details, please refer to document [2].
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Application Interface
3.1. General Description
UC20 is equipped with a 72-pin 1.3mm pitch SMT pads plus 40-pin ground pads and reserved pads that
connect to cellular application platform. Sub-interfaces included in these pads are described in detail in
the following chapters:







Power supply
UART interface
USIM interface
USB interface
PCM interface
ADC interface
Status indication
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3.2. Pin Assignment
The following figure shows the pin assignment of the UC20 module.
GND
USB_DM
USB_DP
RXD
TXD
DTR
RTS
CTS
DCD
RI
STATUS
VBAT_BB
VBAT_BB
VBAT_RF
VBAT_RF
GND
RESERVED
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
USB_VBUS
WAKEUP_IN
54
GND
53
GND
52
GND
AP_READY
SLEEP_IND
W_DISABLE#
51
GND
NET_MODE
50
GND
NET_STATUS
VDD_EXT
GND
GND
108
103
109
104
110
105
99
100
85
90
95
96
91
86
92
87
82 79 76 73
83 80 77 74
84 81 78 75
49
ANT_MAIN
48
GND
47
ANT_GNSS
46
GND
45
ADC0
USIM_GND
10
DBG_RXD
11
DBG_TXD
12
USIM_PRESENCE
13
42
I2C_SDA
USIM_VDD
14
41
I2C_SCL
USIM_DATA
15
40
RESERVED
USIM_CLK
16
39
RESERVED
USIM_RST
17
38
RESERVED
VRTC
18
37
RESERVED
GND
RESERVED
36
RESERVED
ANT_DIV
32
RESERVED
VDD_2V85
31
35
30
RESERVED
RESERVED
GND
34
29
PCM_CLK
ANT
RESERVED
28
PCM_SYNC
PCM
33
27
USIM
26
PCM_IN
PCM_OUT
AGND
25
PWRKEY
RESERVED
22
24
21
GND
RESET_N
UART
23
20
USB
89
94
98
102
88
93
97
101
107
112
19
Power
106
111
RESERVED
44
ADC1
43
RESERVED
OTHERS
Figure 2: Pin Assignment (Top View)
NOTES
1.
2.
Keep all reserved pins and unused pins unconnected.
GND pads 85~112 should be connected to ground in the design, and RESERVED pads 73~84
should be unconnected.
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3.3. Pin Description
The following tables show the UC20’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
VBAT_BB
VBAT_RF
VRTC
Pin No.
59,60
57,58
18
UC20_Hardware_Design
I/O
Description
DC Characteristics
Comment
PI
Power supply for
module baseband
part.
Vmax = 4.3V
Vmin = 3.4V
Vnorm = 3.8V
It must be able to
provide sufficient
current up to 0.8A.
Power supply for
module RF part.
Vmax = 4.3V
Vmin = 3.4V
Vnorm = 3.8V
It must be able to
provide sufficient
current in a transmitting
burst which typically
rises to 2.0A.
Power supply for
internal RTC circuit.
VOmax = 3.25V
when VBAT ≥ 3.4V.
VI = 1.5V~3.25V at
IIN = 3uA when
VBAT is not applied.
PI
IO
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VDD_EXT
VDD_2V85
GND
34
PO
Provide 1.8V for
external circuit.
Vnorm = 1.8V
IOmax = 20mA
Power supply for
external GPIO’s pull up
circuits.
PO
Provide 2.85V for
external circuit.
Vnorm = 2.85V
IOmax = 100mA
Power supply for
external GNSS LNA,
active antenna and
other circuits.
8,9,19,36,
46,48,50~
54,56,72,
85~112
Ground.
Turn On/Off
Pin Name
PWRKEY
RESET_N
Pin No.
21
20
I/O
Description
DC Characteristics
Comment
DI
Turn on/off the
module.
RPU ≈ 200kΩ
VIHmax = 2.1V
VIHmin = 1.3V
VILmax = 500mV
Pull-up to 1.8V
internally.
DI
Reset the module.
RPU ≈ 200kΩ
VIHmax = 2.1V
VIHmin = 1.3V
VILmax = 500mV
Pull-up to 1.8V
internally.
Active low.
DC Characteristics
Comment
Status Indication
Pin Name
Pin No.
I/O
Description
STATUS
61
OD
Indicate the module
operating status.
DO
Indicate the module
network registration
mode.
VOHmin = 1.35V
VOLmax = 0.45V
1.8V power domain.
VOHmin = 1.35V
VOLmax = 0.45V
1.8V power domain.
NET_MODE
Require external
pull-up.
NET_
STATUS
DO
Indicate the module
network activity
status.
SLEEP_IND
DO
Indicate the sleep
status.
VOHmin = 1.35V
VOLmax = 0.45V
1.8V power domain.
Pin No.
I/O
Description
DC Characteristics
Comment
USB Interface
Pin Name
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USB_VBUS
USB_DP
USB_DM
71
69
70
PI
USB detection.
Vmax = 5.25V
Vmin = 3.0V
Vnorm = 5.0V
IO
USB differential data
bus.
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90Ω.
IO
USB differential data
bus.
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90Ω.
I/O
Description
DC Characteristics
Comment
USIM Interface
Pin Name
Pin No.
USIM_GND
10
Specified ground for
USIM card.
For 1.8V USIM:
Vmax = 1.98V
Vmin = 1.62V
USIM_VDD
USIM_DATA
USIM_CLK
14
15
16
UC20_Hardware_Design
PO
IO
DO
Power supply for
USIM card.
Data signal of USIM
card.
Clock signal of USIM
card.
For 3.0V USIM:
Vmax = 3.3V
Vmin = 2.7V
IOmax = 50mA
For 1.8V USIM:
VILmax = 0.27V
VIHmin = 1.26V
VIHmax = 1.8V
VOLmax = 0.27V
VOHmin = 1.26V
For 3.0V USIM:
VILmax = 0.45V
VIHmin = 2.1V
VIHmax = 3.0V
VOLmax = 0.45V
VOHmin = 2.1V
Either 1.8V or 3V is
supported by the
module automatically.
Pull-up to USIM_VDD
with 15k resistor
internally.
For 1.8V USIM:
VOLmax = 0.36V
VOHmin = 1.26V
For 3.0V USIM:
VOLmax = 0.5V
VOHmin = 2.1V
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USIM_RST
USIM_PRE
SENCE
17
DO
Reset signal of
USIM card.
For 1.8V USIM:
VOLmax = 0.22V
VOHmin = 1.44V
For 3.0V USIM:
VOLmax = 0.36V
VOHmin = 2.4V
13
DI
USIM card insertion
detection.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
Pin No.
I/O
Description
DC Characteristics
AI
General purpose
analog to digital
converter.
Voltage range:
0.2V to 2.1V
AI
General purpose
analog to digital
converter.
Voltage range:
0.2V to 4.2V
1.8V power domain.
Comment
ADC Interface
Pin Name
ADC0
ADC1
45
44
Main UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RI
62
DO
Ring indicator.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
DCD
63
DO
Data carrier
detection.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
CTS
64
DO
Clear to send.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
Request to send.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
1.8V power domain.
Pull-up by default.
1.8V power domain.
RTS
65
DI
DTR
66
DI
Data terminal ready.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
TXD
67
DO
Transmit data.
VOLmax = 0.45V
VOHmin = 1.35V
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RXD
68
DI
Receive data.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
Debug UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
DBG_TXD
12
DO
Transmit data.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
1.8V power domain.
Comment
11
DI
Receive data.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
Pin Name
Pin No.
I/O
Description
DC Characteristics
ANT_DIV
35
AI
Diversity antenna.
50Ω impedance
ANT_MAIN
49
IO
Main antenna.
50Ω impedance
ANT_GNSS
47
AI
GNNS antenna.
50Ω impedance
Pin No.
I/O
Description
DC Characteristics
Comment
1.8V power domain.
DBG_RXD
RF Interface
PCM Interface
Pin Name
PCM_IN
24
DI
PCM data input.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
PCM_OUT
25
DO
PCM data output.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
PCM data frame
sync signal.
VOLmax = 0.45V
VOHmin = 1.35V
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
In master mode, it is
an output signal. In
slave mode, it is an
input signal.
PCM data bit clock.
VOLmax = 0.45V
VOHmin = 1.35V
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
In master mode, it’s
an output signal. In
slave mode, it is an
input signal.
PCM_SYNC
PCM_CLK
26
27
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AGND
22
Reserved for analog
ground.
Ground.
If unused, connect
this pin to ground.
Description
DC Characteristics
Comment
I2C Interface
Pin Name
Pin No.
I/O
I2C_SCL
41
OD
I2C serial clock.
External pull-up
resistor is required.
1.8V only.
I2C_SDA
42
OD
I2C serial data.
External pull-up
resistor is required.
1.8V only.
Pin No.
I/O
Description
DC Characteristics
Comment
Sleep mode control.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
Pull-up by default.
Low level wakes up
the module.
DI
Airplane mode
control.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
Pull-up by default.
In low level voltage,
module can enter into
airplane mode.
DI
Application
processor sleep
state detection.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
I/O
Description
DC Characteristics
Comment
Other Pins
Pin Name
WAKEUP_
IN
W_DISABL
E#
AP_READY
DI
RESERVED Pins
Pin Name
Pin No.
RESERV
ED
23,28~33,3
7~40,43,55
,73~84
UC20_Hardware_Design
Keep these pins
unconnected.
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3.4. Operating Modes
The table below briefly summarizes the various operating modes referred to in the following chapters.
Table 5: Overview of Operating Modes
Mode
Details
UMTS Idle
Software is active. The module has registered to the UMTS
network and the module is ready to send and receive data.
UMTS
Talk/Data
UMTS connection is ongoing. In this mode, the power
consumption is decided by network setting (e.g. TPC pattern) and
data transfer rate.
HSPA Idle
Software is active. The module has registered to the HSPA
network and the module is ready to send and receive data.
HSPA Data
HSPA data transfer is ongoing. In this mode, the power
consumption is decided by network setting (e.g. TPC pattern) and
data transfer rate.
Normal Operation
Minimum
Functionality
Mode
AT+CFUN command can set the module entering into a minimum functionality mode
without removing the power supply. In this case, both RF function and USIM card will
be invalid.
Airplane Mode
AT+CFUN command and W_DISABLE# pin can set the module entering into
airplane mode. In this case, RF function will be invalid.
Sleep Mode
In this mode, the current consumption of the module will be reduced to the minimal
level. During this mode, the module can still receive paging message, SMS and voice
call from the network normally.
Power Down
Mode
In this mode, the power management unit shuts down the power supply. Only the
power supply for RTC remains. Software is not active. The serial interface is not
accessible. Operating voltage (connected to VBAT_RF and VBAT_BB) remains
applied.
3.5. Power Saving
3.5.1. Sleep Mode
UC20 is able to reduce its current consumption to a minimum value during the sleep mode. The following
section describes UC20’s power saving procedure.
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3.5.1.1. UART Application
If application processor communicates with module via UART interface, the following preconditions can
let the module enter into the sleep mode.


Execute AT command AT+QSCLK=1 to enable the sleep mode.
Drive DTR to high level.
The following figure shows the connection between the module and application processor.
Processor
Module
RXD
TXD
TXD
RXD
RI
EINT
DTR
GPIO
AP_READY
GPIO
GND
GND
Figure 3: UART Sleep Application
The RI of module is used to wake up the processor, and AP_READY will detect the sleep state of
processor (can be configured to high level or low level detection). You should pay attention to the level
match shown in dotted line between module and processor.
Drive DTR to low level will wake up the module.
3.5.1.2. USB Application with Suspend Function
If application processor communicates with module via USB interface, and processor supports USB
suspend function, the following preconditions can let the module enter into the sleep mode.


Execute AT command AT+QSCLK=1 to enable the sleep mode.
The processor’s USB bus which is connected with the module USB interface enters into suspended
state.
The following figure shows the connection between the module and processor.
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Processor
Module
VDD
USB_VBUS
USB_DP
USB_DP
USB_DM
USB_DM
AP_READY
GPIO
RI
EINT
GND
GND
Figure 4: USB Application with Suspend Function
When the processor’s USB bus returns to resume state, the module will be woken up.
3.5.1.3. USB Application without Suspend Function
If application processor communicates with module via USB interface, and processor does not support
USB suspend function, you should disconnect USB_VBUS with additional control circuit to let the module
enter into sleep mode.


Execute AT command AT+QSCLK=1 to enable the sleep mode.
Disconnect USB_VBUS.
The following figure shows the connection between the module and application processor.
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Module
Processor
GPIO
USB_VBUS
Power
Switch
VDD
USB_DP
USB_DP
USB_DM
USB_DM
RI
EINT
AP_READY
GPIO
GND
GND
Figure 5: USB Sleep Application without Suspend Function
Supply power to USB_VBUS will wake up the module.
In sleep mode, module can still receive paging, voice call and SMS from network, but the UART port is not
accessible. When the module enters into the sleep mode, the SLEEP_IND will output a high logic level.
3.5.2. Airplane Mode
When module gets into the airplane mode, the RF function does not work, and all AT commands
correlative with RF function will be not accessible. This mode can be set with the following way.
Hardware:
The W_DISABLE# pin is pulled up by default, drive it to low level will let the module get into airplane
mode.
Software:
Command AT+CFUN provides the choice of the functionality level =0, 1, 4.
AT+CFUN=0: Minimum functionality mode, both USIM and RF function are disabled.
AT+CFUN=1: Full functionality mode (by default).
AT+CFUN=4: Airplane mode. RF function is disabled.
NOTES
1.
2.
The W_DISABLE# control function is disabled in firmware by default. It can be enabled by AT
command AT+QCFG=“airplanecontrol”. Refer to document [1].
When the module is in sleep mode, the W_DISABLE# control is invalid. Please be sure to wake the
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module up first.
3. GNSS function is still available when RF function is disabled.
3.6. Power Supply
3.6.1. Power Supply Pins
UC20 provides four VBAT pins dedicated to connect with the external power supply. There are two
separate voltage domains for VBAT.


VBAT_RF with two pads for module RF part.
VBAT_BB with two pads for module baseband part.
The following table shows the VBAT pins and ground pins.
Table 6: VBAT and GND Pins
Pin Name
Pin No.
Description
Min.
Typ.
Max.
Unit
VBAT_RF
57,58
Power supply for module RF
part.
3.4
3.8
4.3
VBAT_BB
59,60
Power supply for module
baseband part.
3.4
3.8
4.3
GND
8,9,19,36,46,
48,50~54,56,
72, 85~112
Ground.
3.6.2. Decrease Voltage Drop
The power supply range of the module is 3.4V ~ 4.3V. Because of the voltage drop during the transmitting
time, a bypass capacitor of about 100µF with low ESR should be used. Multi-layer ceramic chip (MLCC)
capacitor can provide the best combination of low ESR. Three ceramic capacitors (100nF, 33pF, 10pF)
are recommended to be applied to the VBAT pins. The capacitors should be placed close to the UC20’s
VBAT pins. The following figure shows star structure of the power supply.
The main power supply from an external application has to be a single voltage source and has to be
expanded to two sub paths with star structure. In addition, in order to get a stable power source, it is
suggested to use a zener diode of which reverse zener voltage is 5.1V and dissipation power is more than
0.5W.
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VBAT
FB1
VBAT_RF
FB2
VBAT_BB
D1
5.1V
C1
100uF
C2
C3
C4
100nF
33pF
10pF
C5
100uF
C6
C7
C8
100nF
33pF
10pF
Module
Figure 6: Star Structure of the Power Supply
Please pay special attention to the power supply design for applications. Make sure the input voltage will
never drop below 3.4V. If the voltage drops below 3.4V, the module will turn off automatically. The PCB
traces from the VBAT pins to the power source must be wide enough to ensure that there isn’t too much
voltage drop occurs in the transmitting procedure. The width of VBAT_BB trace should be no less than
1mm, and the width of VBAT_RF trace should be no less than 2mm, and the principle of the VBAT trace is
the longer, the wider.
3.6.3. Reference Design for Power Supply
The power design for the module is very important, since the performance of power supply for the module
largely depends on the power source. The power supply is capable of providing the sufficient current up to
2A at least. If the voltage drop between the input and output is not too high, it is suggested to use a LDO
to supply power for module. If there is a big voltage difference between the input source and the desired
output (VBAT), a buck converter is preferred to be used as a power supply.
The following figure shows a reference design for +5V input power source. The designed output for the
power supply is 3.88V and the maximum load current is 3A.
MIC29302WU
U1
DC_IN
VBAT
470uF
100nF
ADJ
GND
OUT 4
C2
C1
R1
51K
EN
2 IN
R2
100K
1%
R3
47K
1%
R4
470R
C3
470uF
C4
100nF
Figure 7: Reference Circuit of Power Supply
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3.6.4. Monitor the Power Supply
You can use the AT+CBC command to monitor the VBAT_BB voltage value. For more details, please
refer to document [1].
3.7. Turn on and off Scenarios
3.7.1. Turn on Module Using the PWRKEY
The following table shows the pin definition of PWRKEY.
Table 7: PWRKEY Pin Description
Pin Name
PWRKEY
Pin No.
21
Description
DC Characteristics
Comment
Turn on/off the module.
VIHmax = 2.1V
VIHmin = 1.3V
VILmax = 500mV
Pull-up to 1.8V internally
with 200kΩ resistor.
When UC20 is in power down mode, it can be turned on to normal mode by driving the PWRKEY pin to a
low level at least 100ms. It is recommended to use an open drain/collector driver to control the PWRKEY.
You can monitor the level of the STATUS pin to judge whether the module is turned on or not. After
STATUS pin (require external pull-up) outputting a low level, PWRKEY pin can be released. A simple
reference circuit is illustrated in the following figure.
PWRKEY
≥ 100ms
4.7K
Turn on pulse
47K
Figure 8: Turn on the Module Using Driving Circuit
The other way to control the PWRKEY is using a button directly. A TVS component is indispensable to be
placed nearby the button for ESD protection. When pressing the key, electrostatic strike may generate
from finger. A reference circuit is showed in the following figure.
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S1
PWRKEY
TVS
Close to S1
Figure 9: Turn on the Module Using Keystroke
The turn on scenarios is illustrated as the following figure.
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VBAT
≥ 100ms
VIH ≥ 1.3V
PWRKEY
VIL ≤ 0.5V
RESET_N
1.3 ~ 1.9s
STATUS
(OD)
≥ 5s
UART
Inactive
Active
≥ 5s
USB
Inactive
Active
Figure 10: Timing of Turning on Module
NOTES
Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is
recommended 30ms.
3.7.2. Turn off Module
The following procedures can be used to turn off the module:



Normal power down procedure: Turn off the module using the PWRKEY pin.
Normal power down procedure: Turn off the module using command AT+QPOWD.
Automatic shutdown: Turn off the module automatically if under-voltage or over-voltage is detected.
3.7.2.1. Turn off Module Using the PWRKEY Pin
Driving the PWRKEY to a low level voltage at least 0.6s, the module will execute power-down procedure
after PWRKEY is released. The power-down scenario is illustrated as the following figure.
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VBAT
≥ 0.6s
Log off network about 1s to 60s
PWRKEY
STATUS
(OD)
Module
Status
Power-down procedure
RUNNING
OFF
Figure 11: Timing of Turning off Module
During power-down procedure, module will send out URC “NORMAL POWER DOWN” via URC port first,
then log off network and save important data. After logging off, module sends out “POWERED DOWN”
and shut down the internal power supply. The power on VBAT pins is not allowed to turn off before the
URC “POWERED DOWN” is output to avoid data loss. If logging off is not done within 60s, module will
shut down internal power supply forcibly.
After that moment, the module enters the power down mode, no other AT commands can be executed
and only the RTC is still active. The power down mode can also be indicated by the STATUS pin.
3.7.2.2. Turn off Module Using AT Command
It is also a safe way to use AT command AT+QPOWD to turn off the module, which is similar to turning off
the module via PWRKEY Pin
Please refer to document [1] for details about the AT command of AT+QPOWD.
3.7.2.3. Automatic Shutdown
The module will constantly monitor the voltage applied on the VBAT, if the voltage ≤ 3.5V, the following
URC will be presented:
+QIND: “vbatt”,-1
If the voltage ≥ 4.21V, the following URC will be presented:
+QIND: “vbatt”,1
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The uncritical voltage is 3.4V to 4.3V, If the voltage > 4.3V or < 3.4V the module would automatically shut
down itself.
If the voltage < 3.4V, the following URC will be presented:
+QIND: “vbatt”,-2
If the voltage > 4.3V, the following URC will be presented:
+QIND: “vbatt”,2
NOTE
The value of voltage threshold can be revised by command AT+QCFG=“vbatt”, refer to document [1]
for details.
3.8. Reset the Module
The RESET_N can be used to reset the module.
Table 8: RESET_N Pin Description
Pin Name
RESET_N
Pin No.
20
Description
DC Characteristics
Comment
Reset the module.
VIHmax = 2.1V
VIHmin = 1.3V
VILmax = 500mV
Pull-up to 1.8V internally
with 200kΩ resistor.
Active low.
You can reset the module by driving the RESET_N to a low level voltage for more than 150ms and then
releasing.
The recommended circuit is similar to the PWRKEY control circuit. You can use open drain/collector
driver or button to control the RESET_N.
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RESET_N
≥ 150ms
4.7K
Reset pulse
47K
Figure 12: Reference Circuit of RESET_N by Using Driving Circuit
S2
RESET_N
TVS
Close to S2
Figure 13: Reference Circuit of RESET_N by Using Button
The reset scenario is illustrated as the following figure.
VBAT
≥ 5s
150ms
VIH ≥ 1.3V
RESET_N
VIL ≤ 0.5V
Module
Status
RUNNING
RESETTING
RUNNING
Figure 14: Timing of Resetting Module
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NOTE
Use the RESET_N only when turning off the module by the command AT+QPOWD and the PWRKEY pin
failed.
3.9. RTC Backup
The RTC (Real Time Clock) can be powered by an external power source through the pin VRTC when the
module is powered down and there is no power supply for the VBAT. It is also available to charge the
battery on the VRTC when module is turned on. You can choose rechargeable battery, capacitor or
non-rechargeable battery depending on different applications.
The following figures show the various sample circuits for VRTC backup.
VRTC
RTC
Core
Non-chargeable
Battery
Module
Figure 15: RTC Supply from Non-chargeable Battery
VRTC
RTC
Core
Rechargeable
Battery
Module
Figure 16: RTC Supply from Rechargeable Battery
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VRTC
RTC
Core
Large
Capacitance
Capacitor
Module
Figure 17: RTC Supply from Capacitor
3.10. UART Interface
The module provides two UART interfaces: main UART interface and debug UART interface. The
following shows the different features.


Main UART interface supports 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600bps
baud rate, the default is 115200bps, while autobauding is not supported. This interface can be used
for data transmission, AT communication or firmware upgrade.
Debug UART interface supports 115200bps. It can be used for GNSS NMEA sentences output.
NOTE
USB interface supports software debug and firmware upgrade by default.
The module is designed as the DCE (Data Communication Equipment), following the traditional
DCE-DTE (Data Terminal Equipment) connection. The following tables show the pin definition of these
two UART interfaces.
Table 9: Pin Definition of the Main UART Interface
Pin Name
Pin No.
I/O
Description
Comment
RI
62
DO
Ring indicator.
1.8V power domain.
DCD
63
DO
Data carrier detection.
1.8V power domain.
CTS
64
DO
Clear to send.
1.8V power domain.
RTS
65
DI
Request to send.
1.8V power domain.
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DTR
66
DI
Data terminal ready.
1.8V power domain.
TXD
67
DO
Transmit data.
1.8V power domain.
RXD
68
DI
Receive data.
1.8V power domain.
Table 10: Pin Definition of the Debug UART Interface
Pin Name
Pin No.
I/O
Description
Comment
DBG_TXD
12
DO
Transmit data.
1.8V power domain.
DBG_RXD
11
DI
Receive data.
1.8V power domain.
The logic levels are described in the following table.
Table 11: Logic Levels of Digital I/O
Parameter
Min
Max
Unit
VIL
-0.3
0.6
VIH
1.2
2.0
VOL
0.45
VOH
1.35
1.8
UC20 provides 1.8V UART interface. A level translator should be used if your application is equipped with
a 3.3V UART interface. A level translator TXB0108PWR provided by Texas Instruments is
recommended. The following figure shows the reference design of the TXB0108PWR.
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VDD_EXT
VCCA
VCCB
0.1uF
VDD_3.3V
0.1uF
OE
GND
RI
A1
B1
RI_3.3V
DCD
A2
B2
DCD_3.3V
CTS
A3
TXB0108PWR B3
CTS_3.3V
RTS
A4
B4
RTS_3.3V
DTR
A5
B5
DTR_3.3V
TXD
A6
B6
TXD_3.3V
A7
B7
A8
B8
RXD
51K
RXD_3.3V
51K
Figure 18: Reference Circuit with Translator Chip
Please visit http://www.ti.com for more information.
Another example with transistor translation circuit is shown as below. The construction of dotted line can
refer to the construction of solid line. Please pay attention to direction of connection. Input dotted line of
module should refer to input solid line of the module. Output dotted line of module should refer to output
solid line of the module.
VCC_MCU
4.7K
VDD_EXT
4.7K
MCU/ARM
4.7K
Module
/TXD
RXD
/RXD
TXD
4.7K
VCC_MCU
4.7K
VDD_EXT
/RTS
/CTS
GPIO
EINT
GPIO
GND
RTS
CTS
DTR
RI
DCD
GND
Figure 19: Reference Circuit with Transistor Circuit
The following figure is an example of connection between UC20 and PC. A voltage level translator and a
RS-232 level translator chip must be inserted between module and PC, since these two UART interfaces
do not support the RS-232 level, while support the 1.8V CMOS level only.
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3.3V
OE
VCCB
VCC
GND
DCD
TXD
CTS
RI
DCD_1.8V
TXD_1.8V
DCD_3.3V
TXD_3.3V
DIN1
DIN2
DOUT1
DOUT2
CTS_1.8V
RI_1.8V
CTS_3.3V
RI_3.3V
DOUT3
DOUT4
DOUT5
RXD
DTR
RTS
GND
RXD_1.8V
DTR_1.8V
RTS_1.8V
GND
RXD_3.3V
DTR_3.3V
RTS_3.3V
DIN3
DIN4
DIN5
R1OUTB
ROUT1
ROUT2
ROUT3
5 GND
DCD
RXD
CTS
RI
DSR
RIN1
RIN2
RIN3
3 TXD
4 DTR
7 RTS
VDD_EXT
VCCA
FORCEON
/FORCEOFF
3.3V
Module
TXB0108PWR
/INVALID
DB-9
Connect to PC
SN65C3238
Figure 20: RS232 Level Match Circuit
The following figure shows the reference circuit of debug UART interface with logic level translator.
TXB0102DCU provided by Texas Instruments is recommended.
VDD_EXT
VCCA
0.1uF
OE
VCCB
0.1uF
VDD_3.3V
GND
DBG_TXD
A1
B1
DBG_TXD_3.3V
DBG_RXD
A2
B2
DBG_RXD_3.3V
TXB0102DCU
Figure 21: Reference Circuit of Debug UART with Level Translator
Please visit http://www.ti.com for more information.
NOTES
1.
2.
3.
The module disables the hardware flow control by default. When hardware flow control is required,
RTS and CTS should be connected to the host. AT command AT+IFC=2,2 is used to enable
hardware flow control. AT command AT+IFC=0,0 is used to disable the hardware flow control. For
more details, please refer to document [1].
Rising on DTR will let the module exit from the data mode by default. It can be disabled by AT
commands. Refer to document [1] about the command AT&D and AT&V for details.
DCD is used as data mode indication. Refer to document [1] about the command AT&C and AT&V
for details.
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3.11. USIM Card Interface
3.11.1. USIM Card Application
The USIM card interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and
3.0V USIM cards are supported.
Table 12: Pin Definition of the USIM Interface
Pin Name
Pin No.
I/O
Description
Comment
USIM_VDD
14
PO
Power supply for USIM card.
Either 1.8V or 3.0V is supported by
the module automatically.
USIM_DATA
15
IO
Data signal of USIM card.
Pull-up to USIM_VDD with 15k
resistor internally.
USIM_CLK
16
DO
Clock signal of USIM card.
USIM_RST
17
DO
Reset signal of USIM card.
USIM_PRES
ENCE
13
DI
USIM card insertion detection.
USIM_GND
10
1.8V power domain.
Specified ground for USIM card.
The following figure shows the reference design of the 8-pin USIM card.
VDD_EXT
USIM_VDD
51K
15K
100nF
USIM_GND
Module
USIM_VDD
USIM_RST
22R
USIM_CLK
USIM_PRESENCE
22R
USIM_DATA
22R
USIM Connector
VCC
RST
CLK
33pF
GND
VPP
IO
GND
33pF 33pF
ESDA6V8AV6
GND
GND
Figure 22: Reference Circuit of the 8 Pin USIM Card
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NOTE
Some AT commands are invalid when USIM card is not applied.
UC20 supports USIM card hot-plugging via the USIM_PRESENCE pin. For details, refer to document [1]
about the command AT+QSIMDET. If you do not need the USIM card detection function, keep
USIM_PRESENCE unconnected. The reference circuit for using a 6-pin USIM card connector is
illustrated as the following figure.
USIM_VDD
USIM_GND
Module
USIM_VDD
USIM_RST
USIM_CLK
USIM_DATA
15K
100nF
USIM Connector
VCC
RST
CLK
22R
GND
VPP
IO
22R
22R
33pF
33pF 33pF
ESDA6V8AV6
GND
GND
Figure 23: Reference Circuit of the 6 Pin USIM Card
In order to enhance the reliability and availability of the USIM card in your application, please follow the
following criterion in the USIM circuit design:






Keep layout of USIM card as close as possible to the module. Assure the length of the trace is less
than 200mm.
Keep USIM card signal away from RF and VBAT alignment.
Assure the ground between module and USIM connector short and wide. Keep the width of ground
and USIM_VDD no less than 0.5mm to maintain the same electric potential. The decouple capacitor
of USIM_VDD should be less than 1uF and must be near to USIM connector.
To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away with each other and
shield them with surrounded ground.
In order to offer good ESD protection, it is recommended to add TVS such as WILL
(http://www.willsemi.com) ESDA6V8AV6. The 22Ω resistors should be added in series between the
module and the USIM card so as to suppress the EMI spurious transmission and enhance the ESD
protection.
The pull-up resistor on USIM_DATA line can improve anti-jamming capability when long layout trace
and sensitive occasion is applied.
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3.11.2. Design Considerations for USIM Connector
For 8-pin USIM connector, it is recommended to use Molex 91228. Please visit http://www.molex.com for
more information.
Figure 24: Molex 91228 USIM Connector
Table 13: Pin Description of Molex USIM Connector
Name
Pin
Function
VDD
C1
USIM card power supply.
RST
C2
USIM card reset.
CLK
C3
USIM card clock.
C4
Not defined.
GND
C5
Ground.
VPP
C6
Not connected.
DATA I/O
C7
USIM card data.
C8
Pull-down GND with external circuit. When the tray is present, C4
is connected to C8.
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For 6-pin USIM connector, it is recommended to use Amphenol C707 10M006 512 2. Please visit
http://www.amphenol.com for more information.
Figure 25: Amphenol C707 10M006 512 2 USIM Card Connector
Table 14: Pin Description of Amphenol USIM Connector
Name
Pin
Function
VDD
C1
USIM card power supply.
RST
C2
USIM card reset.
CLK
C3
USIM card clock.
GND
C5
Ground.
VPP
C6
Not connected.
DATA I/O
C7
USIM card data.
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3.12. USB Interface
UC20 contains one integrated Universal Serial Bus (USB) transceiver which complies with the USB 2.0
specification and supports high speed (480 Mbps), full speed (12 Mbps) and low speed (1.5 Mbps) mode.
The USB interface is primarily used for AT command, data transmission, GNSS NMEA sentences output,
software debug and firmware upgrade. The following table shows the pin definition of USB interface.
Table 15: USB Pin Description
Pin Name
Pin No.
I/O
Description
Comment
USB_DP
69
IO
USB differential data bus (positive).
Require differential
impedance of 90Ω.
USB_DM
70
IO
USB differential data bus (minus).
Require differential
impedance of 90Ω.
USB_VBUS
71
PI
Used for detecting the USB interface
connected.
3.0~5.25V.
Typical 5.0V.
GND
72
Ground.
More details about the USB 2.0 specifications, please visit http://www.usb.org/home.
The following figure shows the reference circuit of USB interface.
Close to USB connector
USB_VBUS
USB_VBUS
NM_2pF
USB_DM
USB_DP
USB_DM
USB_DP
Differential layout
ESD Array
GND
GND
Module
USB connector
Figure 26: Reference Circuit of USB Application
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In order to ensure the USB interface design corresponding with the USB 2.0 specification, please comply
with the following principles.




It is important to route the USB signal traces as differential pairs with total grounding. The impedance
of USB differential trace is 90ohm.
Do not route signal traces under crystals, oscillators, magnetic devices and RF signal traces. It is
important to route the USB differential traces in inner-layer with ground shielding not only upper and
lower layer but also right and left side.
Pay attention to the influence of junction capacitance of ESD component on USB data lines. Typically,
the capacitance value should be less than 2pF (e.g.ESD9L5.0ST5G).
Keep the ESD components as closer to the USB connector as possible.
NOTE
UC20 module can only be used as a slave device.
The USB interface is recommended to be reserved for firmware upgrade in your design. The following
figure shows the recommended test points.
Module
USB_VBUS
Connector
USB_VBUS
USB_DM
USB_DM
USB_DP
USB_DP
VBAT_BB
VBAT
VBAT_RF
PWRKEY
GND
PWRKEY
GND
Figure 27: Test Points of Firmware Upgrade
3.13. PCM and I2C Interface
UC20 provides one Pulse Code Modulation (PCM) digital interface for audio design, which supports the
following modes:


Primary mode (short sync, works as both master and slave)
Auxiliary mode (long sync, works as master only)
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In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; the PCM_SYNC falling edge represents the MSB. In this mode, PCM_CLK supports 128, 256, 512,
1024, 2048 and 4096kHz for different speech codec.
In auxiliary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; while the PCM_SYNC rising edge represents the MSB. In this mode, PCM interface operates with a
128kHz PCM_CLK and an 8kHz, 50% duty cycle PCM_SYNC only.
UC20 supports 8-bit A-law and μ-law, and also 16-bit linear data formats. The following figures show the
primary mode’s timing relationship with 8kHz PCM_SYNC and 2048kHz PCM_CLK and auxiliary mode’s
timing relationship with 8kHz PCM_SYNC and 128kHz PCM_CLK.
125us
PCM_CLK
255
256
PCM_SYNC
MSB
LSB
MSB
PCM_OUT
MSB
LSB
MSB
PCM_IN
Figure 28: Primary Mode Timing
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125us
PCM_CLK
15
16
PCM_SYNC
MSB
LSB
PCM_OUT
MSB
LSB
PCM_IN
Figure 29: Auxiliary Mode Timing
The following table shows the pin definition of PCM and I2C interface which can be applied on audio
codec design.
Table 16: Pin Definition of PCM and I2C Interface
Pin Name
Pin No.
I/O
Description
Comment
PCM_IN
24
DI
PCM data input.
1.8V power domain.
PCM_OUT
25
DO
PCM data output.
1.8V power domain.
PCM_SYNC
26
IO
PCM data frame sync signal.
1.8V power domain.
PCM_CLK
27
IO
PCM data bit clock.
1.8V power domain.
I2C_SCL
41
DO
I2C serial clock.
Require external pull-up
resistor.
I2C_SDA
42
IO
I2C serial data.
Require external pull-up
resistor.
Clock and mode can be configured by AT command, and the default configuration is master mode using
short sync data format with 2048kHz PCM_CLK and 8kHz PCM_SYNC. In addition, UC20’s firmware has
integrated the configuration on NAU8814 application with I2C interface. Refer to document [1] about the
command AT+QDAI for details.
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The following figure shows the reference design of PCM interface with external codec IC.
PCM_CLK
MIC+
MIC-
BCLK
PCM_SYNC
FS
PCM_OUT
BIAS
MIC_BIAS
MCLK
DACIN
PCM_IN
ADCOUT
I2C_SCL
SCLK
I2C_SDA
SDIN
SPKOUT+
NAU8814
4.7K
4.7K
Module
SPKOUT-
1.8V
Figure 30: Reference Circuit of PCM Application with Audio Codec
NOTES
1.
2.
It is recommended to reserved RC (R=22Ω, C=22pF) circuit on the PCM lines, especially for
PCM_CLK.
UC20 work as a master device pertaining to I2C interface.
3.14. ADC Function
The module provides two analog-to-digital converters (ADC) to digitize the analog signal to 15-bit digital
data such as battery voltage, temperature and so on. Using AT command AT+QADC=0 can read the
voltage value on ADC0 pin. Using AT command AT+QADC=1 can read the voltage value on ADC1 pin.
For more details of these AT commands, please refer to document [1].
In order to improve the accuracy of ADC, the trace of ADC should be surrounded by ground.
Table 17: Pin Definition of the ADC
Pin name
Pin NO.
Description
ADC0
45
General purpose analog to digital converter.
ADC1
44
General purpose analog to digital converter.
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The following table describes the characteristic of the ADC function.
Table 18: Characteristic of the ADC
Parameter
Min.
ADC0 voltage range
ADC1 voltage range
Typ.
Max.
Unit
0.2
2.1
0.2
4.2
ADC resolution
15
bits
Offset error
3.5
Gain error
2.5
3.15. Network Status Indication
The network indication pins can be used to drive a network status indicator LED. The module provides
two pins which are NET_MODE and NET_STATUS. The following tables describe pin definition and logic
level changes in different network status.
Table 19: Pin Definition of Network Indicator
Pin Name
Pin No.
I/O
Description
Comment
NET_MODE
DO
Indicate the module network
registration mode.
1.8V power domain.
NET_STATUS
DO
Indicate the module network activity
status.
1.8V power domain.
Table 20: Working State of the Network Indicator
Pin name
NET_MODE
NET_STATUS
Status
Description
Always High.
Registered in 3G network.
Always Low.
Others.
Flicker slowly (200ms High/1800ms Low).
Networks searching.
Flicker slowly (1800ms High/200ms Low).
Idle.
Flicker quickly (125ms High/125ms Low).
Data transfer is ongoing.
Always High.
Voice calling.
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A reference circuit is shown in the following figure.
VBAT
Module
2.2K
4.7K
Network
Indicator
47K
Figure 31: Reference Circuit of the Network Indicator
3.16. Operating Status Indication
3.16.1. STATUS
The STATUS pin is an open drain output for indicating the module operation status. You can connect it to
a GPIO of DTE with pulled up, or as LED indication circuit as below. When the module is turned on
normally, the STATUS will present the low state. Otherwise, the STATUS will present high-impedance
state.
Table 21: Pin Definition of STATUS
Pin Name
STATUS
Pin No.
61
I/O
Description
Comment
OD
Indicate the module operation status.
Require external pull-up.
The following figure shows different design circuit of STATUS, you can choose either one according to
your application demands.
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VBAT
VDD_MCU
10K
2.2K
STATUS
STATUS
MCU_GPIO
Module
Module
Figure 32: Reference Circuit of the STATUS
3.16.2. SLEEP_IND
The SLEEP_IND is an indicated pin for judging whether the module is in sleep mode or not. When the
module enters into the sleep mode, the SLEEP_IND will output a logic high level. So you can use the
SLEEP_IND for low current indication. The following table shows the pin definition of SLEEP_IND.
Table 22: Pin Definition of SLEEP_IND
Pin Name
SLEEP_IND
Pin No.
UC20_Hardware_Design
I/O
DO
Description
Comment
Indicate the sleep status.
1.8V power domain.
Outputs high level when the
module is in sleep mode.
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A reference circuit is shown in the following figure.
VBAT
Module
2.2K
SLEEP_IND
4.7K
47K
Figure 33: Reference Circuit of the SLEEP_IND
3.17. Behavior of the RI
You can use command AT+QCFG=“risignaltype”, “physical” to configure RI behavior:
No matter which port URC is presented on, URC will trigger the behavior on RI pin.
NOTE
URC can be output from UART port, USB AT port and USB modem port by command AT+QURCCFG.
The default port is USB AT port.
In additional, RI behavior can be configured flexible. The default behavior of the RI is shown as below.
Table 23: Behavior of the RI
State
Response
Idle
RI keeps high level.
URC
RI outputs 120ms low pulse when new URC returns.
The RI behavior can be changed by command AT+QCFG=“urc/ri/ring”, refer to document [1] for
details.
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GNSS Receiver
4.1. General Description
UC20 includes a fully integrated global navigation satellite system solution that supports the latest
generation gpsOne Gen8 of Qualcomm (GPS and GLONASS). Compared with GPS only, dual systems
increase usable constellation, reduce coverage gaps and TTFF, and increase positioning accuracy,
especially in rough urban environments.
UC20 works in standalone mode, allows device to demodulate GNSS assistance data, calculate position
without any assistance from the network, suitable for various application needing lowest-cost, accurate
position determination. UC20 supports Qualcomm gpsOneXTRA technology (one kind of A-GNSS), which
will download XTRA file from the internet server to enhance the TTFF. XTRA file contains predicted GPS
and GLONASS satellites coordinates and clock biases valid for up to 7days. It is the best if XTRA file is
downloaded once every 1-2 days. And UC20 also supports SBAS (including WAAS, EGNOS and MSAS),
which will improve fix accuracy.
UC20 provides power-saving solution named DPO (Dynamic Power Optimization), which attempts to turn
off GNSS RF parts, reduces current consumption by 50% at most without impact on TTFF and extends
battery life, maximizes talk and standby time as well.
UC20 supports standard NMEA-0183 protocol, and outputs NMEA sentences with 1Hz via USB interface
by default.
By default, UC20 GNSS engine is switched off, it has to be switched on with AT command. For more
details about GNSS engine technology and configurations, refer to document [7].
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4.2. GNSS Performance
The following table shows UC20 GNSS performance.
Table 24: GNSS Performance
Parameter
Description
Conditions
Typ.
Unit
Autonomous
-144
dBm
With LNA
-147
dBm
Autonomous
-154
dBm
With LNA
-159
dBm
Autonomous
-155
dBm
With LNA
-160
dBm
Autonomous
32
XTRA enabled
22
Autonomous
29
XTRA enabled
Autonomous
2.5
XTRA enabled
Autonomous
@open sky
<1.5
Cold start
Sensitivity
(GNSS)
Reacquisition
Tracking
Cold start
@open sky
TTFF
(GNSS)
Warm start
@open sky
Hot start
@open sky
Accuracy
(GNSS)
CEP-50
NOTES
1.
2.
3.
Tracking sensitivity: The lowest GPS signal level at the antenna port which the module does not fail
to fix within 5 minutes by reducing signal intensity.
Reacquisition sensitivity: The lowest GPS signal level at the antenna port which the module fixes
within 3 minutes by increasing signal intensity.
Cold start sensitivity: The lowest GPS signal level at the antenna port which the module fixes within 3
minutes by executing cold start command.
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4.3. Layout Guideline
The following layout guideline should be taken into account in your design.




Maximize the distance between the GNSS antenna and the main UMTS antenna.
Noisy digital circuits such as the USIM card, USB interface, Camera module, Display connector and
SD card should be away from the antenna.
Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar
isolation and protection.
Keep 50 ohm characteristic impedance of the ANT_GNSS trace.
Refer to chapter 5 for GNSS reference design and antenna consideration.
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Antenna Interface
UC20 antenna interface includes a main UMTS antenna, an optional UMTS Rx-diversity antenna, which
is used to improve UMTS’s receiving performance, and a GNSS antenna. The antenna interface has an
impedance of 50Ω.
5.1. UMTS Antenna Interface
5.1.1. Pin Definition
The main antenna and UMTS Rx-diversity antenna pins definition are shown below.
Table 25: Pin Definition of the RF Antenna
Pin Name
Pin No.
I/O
Description
Comment
ANT_MAIN
49
IO
Main antenna
50Ω impedance
ANT_DIV
35
AI
Diversity antenna
50Ω impedance
5.1.2. Operating Frequency
Table 26: The Module Operating Frequencies
Band
Receive
Transmit
Unit
UMTS 1900
1930 ~ 1990
1850 ~ 1910
MHz
UMTS 850
869 ~ 894
824 ~ 849
MHz
5.1.3. Reference Design
The reference design of main antenna and UMTS Rx-diversity antenna is shown as below. It should
reserve a π-type matching circuit for better RF performance. The capacitors are not mounted by default.
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Main
antenna
R1
0R
ANT_MAIN
C1
C2
NM
NM
Diversity
antenna
R2
0R
ANT_DIV
Module
C3
C4
NM
NM
Figure 34: Reference Circuit of Antenna Interface
NOTE
Keep a proper distance between main antenna and diversity antenna to improve the receiving sensitivity.
5.2. GNSS Antenna Interface
The following tables show the GNSS antenna pin definition and frequency specification.
Table 27: Pin Definition of GNSS Antenna
Pin Name
Pin No.
I/O
Description
Comment
ANT_GNSS
47
AI
GNSS antenna
50Ω impedance
VDD_2V85
34
PO
Power for external LNA or
Vnorm=2.85V
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active antenna.
Table 28: GNSS Frequency
Type
Frequency
Unit
GPS
1575.42±1.023
MHz
GLONASS
1597.5~1605.8
MHz
5.2.1. Reference Design for Passive Antenna
NM
Passive
antenna
100pF
GND
RFOUT
GND
/SHDN
ANT_GNSS
MCU_GPIO
6.8nH
51K
RFIN
D1
56pF
NM
VDD_2V85
VCC
MAX2659
33pF
220nF
Module
Figure 35: Reference Circuit of GNSS Passive Antenna
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5.2.2. Reference Design for Active Antenna
VDD
Active
antenna
10R
0.1uF
47nH
100pF
ANT_GNSS
NM
NM
Module
Figure 36: Reference Circuit of GNSS Active Antenna
NOTES
1.
2.
3.
4.
5.
You can choose the corresponding reference circuit above according to your demands on antenna
circuit design.
MAX2659 is the recommended LNA chip. You can disable LNA to save power with one GPIO
shown in above figure. Pay attention to this pin’s voltage level.
VDD supplies power for active antenna. You can choose the right VDD according to the requirements
for active antenna. This power circuit is not needed if passive antenna is applied here.
All NM capacitors are reserved for adjusting RF performance.
The capacitance of ESD component D1 should be less than 1Pf (e.g. LXES15AAA1-100).
5.3. Antenna Installation
5.3.1. Antenna Requirement
The following table shows the requirement on /UMTS antenna and GNSS antenna.
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Table 29: Antenna Requirements
Type
Requirements
GNSS
Frequency range: 1565~1607 MHz
Polarization: RHCP or linear
VSWR: < 2 (Typ.)
Passive antenna gain: > 0dBi
Active antenna noise figure: < 1.5dB
Active antenna gain: > -2dBi
Active antenna embedded LNA gain: 20dB (Typ.)
Active antenna total gain: > 18dBi (Typ.)
5.3.2. Install the Antenna with RF Connector
The following figure is the antenna installation with RF connector provided by HIROSE. The
recommended RF connector is UF.L-R-SMT.
Figure 37: Dimensions of the UF.L-R-SMT Connector (Unit: mm)
You can use U.FL-LP serial connector listed in the following figure to match the UF.L-R-SMT.
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Figure 38: Mechanicals of UF.L-LP Connectors
The following figure describes the space factor of mated connector
Figure 39: Space Factor of Mated Connector (Unit: mm)
For more details, please visit http://www.hirose.com.
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Electrical, Reliability
Characteristics
and
Radio
6.1. Absolute Maximum Ratings
Absolute maximum ratings for power supply and voltage on digital and analog pins of module are listed in
the following table:
Table 30: Absolute Maximum Ratings
Parameter
Min.
Max.
Unit
VBAT_RF/VBAT_BB
-0.3
4.7
USB_VBUS
-0.3
5.5
Peak current of VBAT_BB
0.8
Peak current of VBAT_RF
1.8
Voltage at digital pins
-0.3
2.3
Voltage at ADC0
2.1
Voltage at ADC1
4.2
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6.2. Power Supply Ratings
Table 31: The Module Power Supply Ratings
Parameter
Description
Conditions
Min.
Typ.
Max.
Unit
VBAT
VBAT_BB and
VBAT_RF
Voltage must stay within the
min/max values, including voltage
drop, ripple and spikes.
3.4
3.8
4.3
USB_VBUS
USB detection
3.0
5.0
5.25
6.3. Operating Temperature
The operating temperature is listed in the following table.
Table 32: Operating Temperature
Parameter
Min
Typ.
Max
Unit
Normal Temperature
-35
25
75
ºC
Restricted Operation1)
-40~ -35
75 ~ 85
ºC
Storage Temperature
-45
90
ºC
NOTE
1.
2.
“1)” When the module works within the temperature range, the deviations from the RF specification
may occur. For example, the frequency error or the phase error would increase.
The maximum surface temperature may be up to 100ºC when module works at 85ºC ambient
temperature.
6.4. Current Consumption
The values of current consumption are shown below.
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Table 33: The Module Current Consumption
Parameter
Description
Conditions
OFF state
supply current
Power down
45
uA
Sleep (USB disconnected) @ DRX=6
2.0
mA
Sleep (USB disconnected) @ DRX=7
1.7
mA
Sleep (USB disconnected) @ DRX=8
1.5
mA
Sleep (USB disconnected) @ DRX=9
1.4
mA
Idle (USB disconnected) @ DRX=6
14.0
mA
Idle (USB connected) @ DRX=6
33.4
mA
UMTS Band I HSDPA @max power
517
mA
UMTS Band I HSUPA @max power
497
mA
UMTS Band II HSDPA @max power
521
mA
UMTS Band II HSUPA @max power
502
mA
UMTS Band V HSDPA @max power
505
mA
UMTS Band V HSUPA @max power
480
mA
UMTS Band VIII HSDPA @max power
429
mA
UMTS Band VIII HSUPA @max power
429
mA
UMTS Band I @max power
445
mA
UMTS Band II @max power
484
mA
UMTS Band V @max power
475
mA
UMTS Band VIII @max power
387
mA
33.4
mA
80.6
mA
71.2
mA
WCDMA supply
current (GNSS
off)
IVBAT
WCDMA data
transfer (GNSS
off)
WCDMA voice
call
Min.
GNSS Off
Cold Start
(Autonomous)
Idle, USB connected @ DRX=6
Tracking
(Autonomous)
Typ.
Max.
Unit
NOTE
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GNSS tracking current is tested in the following conditions:
 For Cold Start, 10 minutes after First Fix.
 For Hot Start, 15 seconds after First Fix.
6.5. RF Output Power
The following table shows the RF output power of UC20 module.
Table 34: Conducted RF Output Power
Frequency
Max.
Min.
UMTS 1900
22.5dBm+1/-1dB
<-50dBm
UMTS 850
22.5dBm+1/-1dB
<-50dBm
6.6. RF Receiving Sensitivity
The following table shows the conducted RF receiving sensitivity of UC20 module.
Table 35: Conducted RF Receiving Sensitivity
Frequency
Receive Sensitivity (Typ.)
UMTS 1900
-110dBm
UMTS 850
-110dBm
6.7. Electrostatic Discharge
The module is not protected against electrostatics discharge (ESD) in general. Consequently, it is subject
to ESD handling precautions that typically apply to ESD sensitive components. Proper ESD handling and
packaging procedures must be applied throughout the processing, handling and operation of any
application that incorporates the module.
The following table shows the module electrostatics discharge characteristics.
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Table 36: Electrostatics Discharge Characteristics
Tested Points
Contact Discharge
Air Discharge
VBAT, GND
±5
±10
kV
All antenna interfaces
±4
±8
kV
±0.5
±1
kV
Other interfaces
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Mechanical Dimensions
This chapter describes the mechanical dimensions of the module. All dimensions are measured in mm.
7.1. Mechanical Dimensions of the Module
(29+/-0.15)
(32+/-0.15)
Figure 40: UC20 Top and Side Dimensions
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1.5
32
3.2
3.4
3.2
3.4
3.2
3.4
4.8
29
0.5
Figure 41: UC20 Bottom Dimensions (Bottom View)
NOTE
“XXXX” in pink on above figure is the PCB board code in the exposed copper.
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Figure 42: Bottom Pads Dimensions (Bottom View)
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7.2. Footprint of Recommendation
22.1
3.45
3.4
1.9
6.45
6.8
6.16
4.6
9.3
4.8
2.5
1.0
1.9
13
29
4.4
7.8
9.04
0.8
1.3
32
Figure 43: Recommended Footprint (Top View)
NOTES
1.
2.
Keep out the area below the test point (circular area on the above figure) in the host PCB.
In order to maintain the module, keep about 3mm between the module and other components in the
host PCB.
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7.3. Top View of the Module
Figure 44: Top View of the Module
7.4. Bottom View of the Module
Figure 45: Bottom View of the Module
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Storage and Manufacturing
8.1. Storage
UC20 is stored in the vacuum-sealed bag. The restriction of storage condition is shown as below.
Shelf life in sealed bag is 12 months at < 40ºC / 90%RH.
After this bag is opened, devices that will be subjected to reflow solder or other high temperature process
must be:


Mounted within 72 hours at factory conditions of ≤ 30ºC / 60%RH.
Stored at <10% RH.
Devices require bake, before mounting, if:


Humidity indicator card is >10% when read 23ºC ± 5ºC.
Mounted for more than 72 hours at factory conditions of ≤o30ºC / 60% RH.
If baking is required, devices may be baked for 48 hours at 125ºC ± 5ºC.
NOTE
As plastic container cannot be subjected to high temperature, Module needs to be taken out from
container to high temperature (125ºC) bake. If shorter bake times are desired, please refer to
IPC/JEDECJ-STD-033 for bake procedure.
8.2. Manufacturing and Welding
The squeegee should push the paste on the surface of the stencil that makes the paste fill the stencil
openings and penetrate to the PCB. The force on the squeegee should be adjusted so as to produce a
clean stencil surface on a single pass. To ensure the module soldering quality, the thickness of stencil at
the hole of the module pads should be 0.18mm. For details, please refer to document [6].
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It is suggested that peak reflow temperature is 235 ~ 245ºC (for SnAg3.0Cu0.5 alloy). Absolute max
reflow temperature is 260ºC. To avoid damage to the module when it was repeatedly heated, it is
suggested that the module should be mounted after the first panel has been reflowed. The following
picture is the actual diagram which we have operated.
ºC
Preheat
Heating
Cooling
250
Liquids Temperature
217
200 ºC
200
40s~60s
160 ºC
150
70s~120s
100
Between 1~3 ºC/s
50
50
100
150
200
250
300
Time
Figure 46: Liquids Temperature
8.3. Packaging
UC20 is packaged in the tap and reel carriers. One reel is 11.53m length and contains 250pcs modules.
The figure below shows the package details, measured in mm.
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1
.5
±0
0.35±0.05
29.3±0.15
30.3±0.15
44.00±0.3
20.20±0.15
44.00±0.1
2.00±0.1
4.00±0.1
30.3±0.15
1.75±0.1
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4.2±0.15
3.1±0.15
32.5±0.15
33.5±0.15
32.5±0.15
33.5±0.15
48.5
Cover tape
13
100
Direction of feed
44.5+0.20
-0.00
Figure 47: Carrier Tape
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Appendix A Reference
Table 37: Related Documents
SN
Document Name
Remark
[1]
UC20_AT_Commands_Manual
UC20 AT Commands Manual
[2]
UC20_EVB_User_Guide
UC20 EVB User Guide
[3]
UC20_Reference_Design
UC20 Reference Design
[4]
UC20&M10_Reference_Design
UC20 and M10 Compatible Reference Design
[5]
UC20&M10_Compatibilty_Design
UC20 and M10 Compatibility Design Specification
[6]
Module_Secondary_SMT_User_Guide
Module Secondary SMT User Guide
[7]
UC20_GNSS_AT_Commands_Manual
UC20 GNSS AT Commands Manual
Table 38: Terms and Abbreviations
Abbreviation
Description
AMR
Adaptive Multi-rate
ARP
Antenna Reference Point
bps
bits per second
CHAP
Challenge Handshake Authentication Protocol
CMUX
Customer
CS
Coding Scheme
CSD
Circuit Switched Data
CTS
Clear To Send
DRX
Discontinuous Reception
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DCE
Data Communications Equipment (typically module)
DTE
Data Terminal Equipment (typically computer, external controller)
DTR
Data Terminal Ready
DTX
Discontinuous Transmission
EFR
Enhanced Full Rate
ESD
Electrostatic Discharge
FR
Full Rate
GLONASS
GLObalnaya NAvigatsionnaya Sputnikovaya Sistema, the Russian Global
Navigation Satellite System
GMSK
Gaussian Minimum Shift Keying
GNSS
Global Navigation Satellite System
GPS
Global Positioning System
GSM
Global System for Mobile Communications
HR
Half Rate
HSPA
High Speed Packet Access
I/O
Input/Output
IMEI
International Mobile Equipment Identity
Imax
Maximum Load Current
Inorm
Normal Current
LED
Light Emitting Diode
LNA
Low Noise Amplifier
MO
Mobile Originated
MS
Mobile Station (GSM engine)
MT
Mobile Terminated
PAP
Password Authentication Protocol
PBCCH
Packet Switched Broadcast Control Channel
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PCB
Printed Circuit Board
PDU
Protocol Data Unit
PPP
Point-to-Point Protocol
PSK
Phase Shift Keying
QAM
Quadrature Amplitude Modulation
QPSK
Quadrature Phase Shift Keying
RF
Radio Frequency
RHCP
Right Hand Circularly Polarized
RMS
Root Mean Square (value)
RTC
Real Time Clock
Rx
Receive
SIM
Subscriber Identification Module
SMS
Short Message Service
TDMA
Time Division Multiple Access
TE
Terminal Equipment
TX
Transmitting Direction
UART
Universal Asynchronous Receiver & Transmitter
UMTS
Universal Mobile Telecommunications System
URC
Unsolicited Result Code
USIM
Universal Subscriber Identity Module
USSD
Unstructured Supplementary Service Data
Vmax
Maximum Voltage Value
Vnorm
Normal Voltage Value
Vmin
Minimum Voltage Value
VIHmax
Maximum Input High Level Voltage Value
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VIHmin
Minimum Input High Level Voltage Value
VILmax
Maximum Input Low Level Voltage Value
VILmin
Minimum Input Low Level Voltage Value
VImax
Absolute Maximum Input Voltage Value
VImin
Absolute Minimum Input Voltage Value
VOHmax
Maximum Output High Level Voltage Value
VOHmin
Minimum Output High Level Voltage Value
VOLmax
Maximum Output Low Level Voltage Value
VOLmin
Minimum Output Low Level Voltage Value
VSWR
Voltage Standing Wave Ratio
WCDMA
Wideband Code Division Multiple Access
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Author                          : Amy. Feng

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