Wavecom Q2686 User manual

Revision: 010
Date: June 30, 2009
Reference: WM_PRJ_Q2686_PTS_001
Q2686 Wireless CPU®
Product Technical Specification

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WM_PRJ_Q2686_PTS_001-010 June 30, 2009
Q2686 Wireless CPU®
Q2686 Wireless CPU®
Product Technical Specification
Reference: WM_PRJ_Q2686_PTS_001
Revision:
010
Date:
June 30, 2009
Supports Open AT®embedded ANSI C applications

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Q2686 Wireless CPU®
Document History
Level Date List of revisions
001 01/17/2005 Creation (Preliminary version)
002 06/01/2005 Pin-out modification (see chapter 3.1)
003 15/09/2005
Update Functional architecture
Pin-out modification (see chapter 4.1)
Add RESET state of all IOs of all interfaces
Update power supply range (see chapter 3.2)
Update electrical information for digital IO
(see chapter 3.2)
Update SPI bus configuration (see chapter 3.4)
Remove 3 GPIO (see chapter 3.9)
Change MIC1 biasing voltage configuration
(see chapter 3.11)
Change SPK1 definition to only single-ended
(see chapter 3.11)
Update ON/ÕFF operating sequence (see chapter 3.14)
Update BOOT definition (see chapter 3.15)
Update ~RESET operating sequence and electrical characteristics
(see chapter 3.14)
Update Interrupt activation (see chapter 3.17)
Update RTC electrical characteristics (see chapter 3.19)
Update PCM description and add waveform
(see chapter 3.21)
004 November 22,
2005
Update Q2686 version “Overview” section
Update “Cautions”, “Trademarks” and “Copyright”
Update “Electrical information for digital I/O”
(see chapter 3.3)
Update SPI max frequency (see chapter 3.4)
Update available GPIO (see chapter 3.9)
Add “OFF state“ voltage caution (see chapter 3.2)
Update “Battery charging interface” (see chapter 3.13)
Update “Analog audio interface” (see chapter 3.11)
Update ”Environmental Specifications” (see chapter 4.2)
Update “General Purpose Connector pin-out description” (see
chapter 4.1)
005 February 2006 Update “PCM interface” waveform (see chapter 3.21)
Update “Electrical information for digital IO” absolute maximum
rating (see chapter 3.3)
Update “General purpose connector” (see chapter 3.1)
Update “SPI bus” speed (see chapter 3.4.1)
Update “I²C bus” (see chapter 3.4.2)
Update “Main serial link UART 1” maximum speed
(see chapter 3.6)
Update “Auxiliary serial link UART 2” maximum speed (see
chapter 3.7)
Update “SIM” General description (see chapter 3.8.1)
Update “USB 2.0 interface” features (see chapter 3.22)
Update “Operating system upgrade” (see chapter 6.3)
Update “General purpose input/output” signals description (see
chapter 3.9)
Update “General purpose connector pin-out description” signal
description (see chapter 4.1)
Update “Battery charging interface” (see chapter 3.13)
Update “Analog to μDigital Converter” (see chapter 3.10)
Update “FLASH-LED signal” (see chapter 3.20)

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Q2686 Wireless CPU®
Level Date List of revisions
Update ‘Analog Audio interface” (see chapter 3.11)
006 March 2006
Update “Power consumption” (see chapter 3.3.2)
Update “ON/~OFF signal” (see chapter 3.14)
Update “BAT-RTC” (see chapter 3.19)
Update “Electrical information for digital IO” absolute maximum
rating (see chapter 3.3)
Update “Buzzer output”, remove PWM features ( see chapter 3.12
)
Update “EMC recommendation” add ESD recommendations (see
chapter 6.1.1 )
Update “SPI bus” add waveforms ( see chapter 3.4.1 )
Update “I²C bus” add waveforms ( see chapter 3.4.2 )
Update “Analog to Digital Converter“ sampling rate
(see chapter 3.10)
007 March 2007
Modification of the ON/ ~OFF paragraph
Add ATEX 94/9/CE directive information in section 4.4
Update reference documents
Update section 3.6 “Main serial link (UART1)”
Other minor corrections
008 June 2008
Software update : Open AT®Software Suite v2
Consumption modifications: ( see chapter 3.22)
Modification in analog audio interface ( see chapter 3.11 ).
Update of Temperature Class B (-30 °C + 85°C ) ( see chapter 4.3 )
New chapter for correspondences of labelling between Q2686
with Open AT®Software Suite v2 ( see chapter 4.2 )
ADC modifications: ( see chapter 3.10)
SPI modification: ( see chapter 3.4 )
BUZZER modifications : ( see chapter 3.12 )
LED0 : new designation : ( see chapter 3.20 and 4.2)
GPIO44:new designation: ( see chapter 4.2 )
Reset signal: modification on input impedance (see chapter 3.16)
Current start up definition ( see chapter 3.2.2 )
Charger interface updated ( see chapter 3.13 )
RTC interface : Maximum input voltage updated (see chapter
3.19.1)
009 May 14, 2009 Update Storage temperature in section 4.3.
Updates to contents of section 7.1.
010 June 30, 2009
Updated to antenna gain information in section 7.1.

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Q2686 Wireless CPU®
Overview
This document defines and specifies the Q2686 Wireless CPU®, available in a
GSM/GPRS Class 10 quad-band version:
•Q2686H: EGSM/GPRS 900/1800/850/1900 MHz version with 32 Mb of
Bursted Flash memory and 8Mb of SRAM (32/8).
•Q2686G: EGSM/GPRS 900/1800/850/1900 MHz version with 64 Mb of
Bursted Flash memory and 16 Mb of SRAM (64/16).
The Q2686 Wireless CPU®supports a powerful open software platform (Open
AT®). Open AT®is the world’s most comprehensive cellular development
environment, which allows embedded standard ANSI C applications to be
natively executed directly on the Wireless CPU®.
This Product Technical Specification document covers the Wireless CPU®alone
and does not include the programmable capabilities provided via the use of
Open AT®Software Suites.
For detailed software programming guides, refer to the documents shown in the
“WM_PRJ_Q2686_PTS_001” section.

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Q2686 Wireless CPU®
Cautions
This platform contains a modular transmitter. This device is used for wireless
applications. Note that all electronics parts and elements are ESD sensitive.
Information provided herein by WAVECOM is accurate and reliable. However, no
responsibility is assumed for its use and any of such WAVECOM information is
herein provided “as is” without any warranty of any kind, whether express or
implied.
Trademarks
, , ®, inSIM®, “YOU MAKE IT, WE MAKE IT
WIRELESS”®, WAVECOM®, WISMO®, Wireless Microprocessor®, Wireless CPU®,
Open AT®and certain other trademarks and logos appearing on this document,
are filed or registered trademarks of Wavecom S.A. in France and/or in other
countries. All other company and/or product names mentioned may be filed or
registered trademarks of their respective owners.
Copyright
This manual is copyrighted by WAVECOM with all rights reserved. No part of
this manual may be reproduced, modified or disclosed to third parties in any
form without the prior written permission of WAVECOM.
No Warranty/No Liability
This document is provided “as is”. Wavecom makes no warranties of any kind,
either expressed or implied, including any implied warranties of merchantability,
fitness for a particular purpose, or noninfringement. The recipient of the
documentation shall endorse all risks arising from its use. In no event shall
Wavecom be liable for any incidental, direct, indirect, consequential, or punitive
damages arising from the use or inadequacy of the documentation, even if
Wavecom has been advised of the possibility of such damages and to the extent
permitted by law.

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Q2686 Wireless CPU®
Web Site Support
General information about Wavecom and its
range of products:
www.wavecom.com
Specific support about the Q2686 Wireless
CPU®:
www.wavecom.com/Q2686
Carrier/Operator approvals: www.wavecom.com/approvals
Open AT®Introduction: www.wavecom.com/OpenAT
Developer support for software and hardware: www.wavecom.com/forum

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Q2686 Wireless CPU®
Table of Contents
1References ................................................................................ 13
1.1 Reference Documents........................................................................... 13
1.1.1 Open AT® Software Documentation............................................... 13
1.1.2 AT Software Documentation......................................................... 13
1.1.3 Hardware Documents ................................................................... 13
1.1.4 Other Wavecom Documents ......................................................... 13
1.1.5 General Reference Documents ...................................................... 13
1.2 List of Abbreviations ............................................................................. 14
2General Description .................................................................. 17
2.1 General Information .............................................................................. 17
2.1.1 Overall Dimensions ....................................................................... 17
2.1.2 Environment and Mechanics......................................................... 17
2.1.3 GSM/GPRS Features ..................................................................... 17
2.1.4 Interfaces ...................................................................................... 17
2.1.5 Operating System ......................................................................... 18
2.1.6 Connection Interfaces ................................................................... 18
2.2 Functional Architecture......................................................................... 19
2.2.1 RF Functionalities ......................................................................... 20
2.2.2 Baseband Functionalities .............................................................. 20
2.3 Operating System ................................................................................. 20
3Interfaces ................................................................................. 21
3.1 General Purpose Connector (GPC)......................................................... 21
3.2 Power Supply ....................................................................................... 22
3.2.1 Power Supply Description............................................................. 22
3.2.2 Power Consumption ..................................................................... 23
3.2.2.1 Start-up Current...................................................................... 24
3.2.2.2 Power Consumption without Open AT®Processing ................ 25
3.2.2.3 Power Consumption with Open AT®Software ........................ 26
3.2.2.4 Consumption Waveform Samples ........................................... 28
3.2.2.5 Power Supply Pin-out ............................................................. 30
3.3 Electrical Information for Digital I/O....................................................... 31
3.4 Serial interface...................................................................................... 33
3.4.1 SPI Bus ......................................................................................... 33
3.4.1.1 Characteristics ........................................................................ 33
3.4.1.2 SPI configuration..................................................................... 33
3.4.1.3 SPI waveforms........................................................................ 34
3.4.1.4 SPI1 Bus: Pins description ...................................................... 35

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3.4.1.5 SPI2 Bus: Pins description ...................................................... 35
3.4.2 I2C Bus ......................................................................................... 36
3.4.2.1 I²C Waveforms ........................................................................ 36
3.4.2.2 I²C Bus Pin-out ....................................................................... 37
3.5 Keyboard Interface................................................................................ 37
3.6 Main Serial Link (UART1) ...................................................................... 38
3.7 Auxiliary Serial Link (UART2) ................................................................ 40
3.8 SIM Interface ........................................................................................ 41
3.8.1 General Description....................................................................... 41
3.9 General Purpose Input/Output .............................................................. 43
3.10 Analog to Digital Converter................................................................... 45
3.11 Analog Audio Interface ......................................................................... 46
3.11.1 Microphone Features .................................................................... 46
3.11.1.1 MIC1 Microphone Inputs ........................................................ 46
3.11.1.2 MIC2 Microphone Inputs ........................................................ 47
3.11.2 Speaker Features .......................................................................... 49
3.11.2.1 Speakers Outputs Power......................................................... 49
3.11.3 Pin description .............................................................................. 51
3.12 Buzzer Output ...................................................................................... 52
3.13 Battery Charging Interface .................................................................... 53
3.13.1 Ni-Cd / Ni-Mh Charging Algorithm ................................................ 53
3.13.2 Li-Ion Charging Algorithm............................................................. 55
3.13.3 Pre-charging ................................................................................. 56
3.13.4 Temperature Monitoring ............................................................... 56
3.14 ON / ~OFF signal .................................................................................. 58
3.14.1 Operating Sequences .................................................................... 58
3.14.1.1 Power-ON ............................................................................... 58
3.14.1.2 Power-OFF.............................................................................. 61
3.15 BOOT Signal......................................................................................... 62
3.16 Reset Signal (~RESET).......................................................................... 63
3.17 External Interrupt.................................................................................. 65
3.18 VCC_2V8 and VCC_1V8 Output............................................................. 66
3.19 BAT-RTC (Backup Battery).................................................................... 67
3.19.1 Interface Description ..................................................................... 67
3.20 LED0 Signal .......................................................................................... 69
3.21 Digital Audio Interface (PCM)................................................................ 72
3.21.1 Description ................................................................................... 72
3.22 USB 2.0 Interface.................................................................................. 75
3.23 RF Interface .......................................................................................... 76
3.23.1 RF Connections............................................................................. 76
3.23.2 RF Performance ............................................................................ 76
3.23.3 Antenna Specifications ................................................................. 77
4Technical Specifications ........................................................... 78

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Q2686 Wireless CPU®
4.1 General Purpose Connector Pin-out Description.................................... 78
4.2 Labeling Correspondence between Q2686 and Open AT®Software Suite
v2 81
4.3 Environmental Specifications ................................................................ 82
4.4 Conformance with ATEX 94/9/CE directive............................................ 83
4.5 Mechanical Specifications..................................................................... 83
4.5.1 Physical Characteristics ................................................................ 83
4.5.2 Mechanical Drawings ................................................................... 83
5Connector and Peripheral Device References............................ 85
5.1 General Purpose Connector .................................................................. 85
5.2 SIM Card Reader .................................................................................. 85
5.3 Microphone .......................................................................................... 85
5.4 Speaker ................................................................................................ 86
5.5 Antenna Cable ...................................................................................... 86
5.6 RF Board-to-board Connector ............................................................... 86
5.7 GSM Antenna....................................................................................... 86
6Design Guidelines ..................................................................... 87
6.1 HARDWARE and RF.............................................................................. 87
6.1.1 EMC Recommendations................................................................ 87
6.1.2 Power Supply ............................................................................... 88
6.1.3 Layout Requirement...................................................................... 89
6.1.4 Antenna ........................................................................................ 90
6.2 Mechanical Integration ......................................................................... 90
6.3 Operating System Upgrade................................................................... 90
7Appendix................................................................................... 91
7.1 Standards and Recommendations ........................................................ 91
7.2 Safety Recommendations (for information only).................................... 95
7.2.1 RF Safety ...................................................................................... 95
7.2.1.1 General ................................................................................... 95
7.2.1.2 Exposure to RF Energy............................................................ 95
7.2.1.3 Efficient Terminal Operation .................................................... 95
7.2.1.4 Antenna Care and Replacement .............................................. 96
7.2.2 General Safety............................................................................... 96
7.2.2.1 Driving .................................................................................... 96
7.2.2.2 Electronic Devices ................................................................... 96
7.2.2.3 Vehicle Electronic Equipment .................................................. 96
7.2.2.4 Medical Electronic Equipment ................................................. 96
7.2.2.5 Aircraft.................................................................................... 97
7.2.2.6 Children .................................................................................. 97
7.2.2.7 Blasting Areas......................................................................... 97
7.2.2.8 Potentially Explosive Atmospheres.......................................... 97

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Q2686 Wireless CPU®
Table of Figures
AUDIO
POWER
UART2
PCM
UART1
USB
SIM 1.8V/3V
EBI
DAC
A
DC
GPIO
SPI1
I2C
SPI2
EXT
_
IT
RF
INTERFACE
SUPPLY INTERFACE
AUDIO FILTER
MEMORY
FLASH / SRAM
RF
FRONT END
RF
TRANSCEIVER
COAX
UFL
IMP
ANTENNA
Q
2
6
8
6
B
O
A
R
D
T
O
B
O
A
R
D
I
N
T
E
R
F
A
C
E
C
O
N
N
E
C
T
O
R
CHARGER
RTC
USB detection
KEYPAD
Figure 1: Functional architecture................................................................. 19
Figure 2: Power supply during burst emission.................................................. 22
Figure 3: Start-up current waveform................................................................. 24
Figure 4: SPI Timing diagrams,Mode 0,Master,4 wires .................................... 34
Figure 5: SPI Timing diagrams with LOAD signal, Mode 0, Master, 4 wires..... 35
Figure 6: I²C Timing diagrams, Master ............................................................. 36
Figure 7: Ni-Cd / Ni-Mh charging waveform ..................................................... 53
Figure 8: Li-Ion full charging waveform ............................................................ 55
Figure 9: Power-ON sequence (no PIN code activated) ..................................... 59
Figure 10: Power-OFF sequence....................................................................... 61

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Q2686 Wireless CPU®
Figure 11: Reset sequence waveform ............................................................... 63
Figure 12: Real Time Clock power supply ......................................................... 67
Figure 13: LED0 state during RESET and Initialization time............................... 71
Figure 14: PCM frame waveform ...................................................................... 73
Figure 15: PCM sampling waveform................................................................. 73
Figure 16: Environmental classes ..................................................................... 82
Figure 17: Mechanical drawing ........................................................................ 84
Figure 18: Layout requirement.......................................................................... 89

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Q2686 Wireless CPU®
1References
1.1 Reference Documents
For more details, several reference documents may be consulted. The
Wavecom reference documents are provided in the Wavecom document
package, contrary to the general reference documents which are not authored
by Wavecom.
Please check the web site for the latest documentation available. Note that the
last software version available for Q2686 is Open AT®Software Suite v2.0.
1.1.1 Open AT® Software Documentation
[1] Getting started with Open AT®
[2] Tutorial for Open AT®
[3] Tools Manual for Open AT®
[4] Basic Development Guide for Open AT®
[5] ADL User Guide for Open AT®
[6] Open AT®Release Note
1.1.2 AT Software Documentation
[7] AT commands interface Guide V7.1
[8] AT Commands Interface Guide (Bluetooth)
[9] Open AT®firmware Release Note
1.1.3 Hardware Documents
[10] Q2686 Wireless CPU®Customer Design Guidelines
(Ref. WM_PRJ_Q2686_PTS_003)
[11] Q2686 Wireless CPU®Process Customer Guidelines
(Ref.WM_PRJ_Q2686_PTS_004)
1.1.4 Other Wavecom Documents
[12] Automotive Environmental Control Plan for Q2686 Wireless CPU®
(Ref. WM_T&D_Q2686_DCP_001)
1.1.5 General Reference Documents
[13] “I²C Bus Specification”, Version 2.0, Philips Semiconductor 1998
[14] ISO 7816-3 Standard

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Q2686 Wireless CPU®
1.2 List of Abbreviations
Abbreviation Definition
AC Alternating Current
ADC Analog to Digital Converter
A/D Analog to Digital conversion
AF Audio-Frequency
AT ATtention (prefix for modem commands)
AUX AUXiliary
CAN Controller Area Network
CB Cell Broadcast
CEP Circular Error Probable
CLK CLocK
CMOS Complementary Metal Oxide Semiconductor
CS Coding Scheme
CTS Clear To Send
DAC Digital to Analog Converter
dB Decibel
DC Direct Current
DCD Data Carrier Detect
DCE Data Communication Equipment
DCS Digital Cellular System
DR Dynamic Range
DSR Data Set Ready
DTE Data Terminal Equipment
DTR Data Terminal Ready
EFR Enhanced Full Rate
E-GSM Extended GSM
EMC ElectroMagnetic Compatibility
EMI ElectroMagnetic Interference
EMS Enhanced Message Service
EN ENable
ESD ElectroStatic Discharges
FIFO First InFirst Out
FR Full Rate

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Q2686 Wireless CPU®
Abbreviation
Definition
FTA Full Type Approval
GND GrouND
GPI General Purpose Input
GPC General Purpose Connector
GPIO General Purpose Input Output
GPO General Purpose Output
GPRS General Packet Radio Service
GPS Global Positioning System
GSM Global System for Mobile communications
HR Half Rate
I/O Input / Output
LED Light Emitting Diode
LNA Low Noise Amplifier
MAX MAXimum
MIC MICrophone
MIN MINimum
MMS Multimedia Message Service
MO Mobile Originated
MT Mobile Terminated
na Not Applicable
NF Noise Factor
NMEA National Marine Electronics Association
NOM NOMinal
NTC Negative Temperature Coefficient
PA Power Amplifier
Pa Pascal (for speaker sound pressure measurements)
PBCCH Packet Broadcast Control CHannel
PC Personal Computer
PCB Printed Circuit Board
PDA Personal Digital Assistant
PFM Power Frequency Modulation
PSM Phase Shift Modulation
PWM Pulse Width Modulation
RAM Random Access Memory

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Q2686 Wireless CPU®
Abbreviation
Definition
RF Radio Frequency
RFI Radio Frequency Interference
RHCP Right Hand Circular Polarization
RI Ring Indicator
RST ReSeT
RTC Real Time Clock
RTCM Radio Technical Commission for Maritime services
RTS Request To Send
RX Receive
SCL Serial CLock
SDA Serial DAta
SIM Subscriber Identification Module
SMS Short Message Service
SPI Serial Peripheral Interface
SPL Sound Pressure Level
SPK SPeaKer
SRAM Static RAM
TBC To Be Confirmed
TDMA Time Division Multiple Access
TP Test Point
TVS Transient Voltage Suppressor
TX Transmit
TYP TYPical
UART Universal Asynchronous Receiver-Transmitter
USB Universal Serial Bus
USSD Unstructured Supplementary Services Data
VSWR Voltage Standing Wave Ratio

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Q2686 Wireless CPU®
2General Description
2.1 General Information
The Q2686 series is a self-contained E-GSM/GPRS 900/1800 and 850/1900
quad-band Wireless CPU®with the following characteristics:
2.1.1 Overall Dimensions
•Length: 40 mm
•Width: 32.2 mm
•Thickness: 4 mm
2.1.2 Environment and Mechanics
•Green policy: RoHS compliant
•Complete shielding
The Q2686 Wireless CPU®is compliant with RoHS (Restriction of Hazardous
Substances in Electrical and Electronic Equipment) Directive 2002/95/EC which
sets limits for the use of certain restricted hazardous substances. This directive
states that “from 1st July 2006, new electrical and electronic equipment put
on the market does not contain lead, mercury, cadmium, hexavalent
chromium, polybrominated biphenyls (PBB), and polybrominated diphenyl
ethers (PBDE)”.
The Wireless CPU®s which are compliant with this
directive are identified by the RoHs logo on their label.
2.1.3 GSM/GPRS Features
•2-Watt EGSM 900/GSM 850 radio section running under 3.6 volts
•1-Watt GSM1800/1900 radio section running under 3.6 volts
•Hardware GPRS class 10 capable
2.1.4 Interfaces
•Digital section running under 2.8 volts and 1.8V.
•3V/1V8 SIM interface
•Complete interfacing:
oPower supply
oSerial link
oAnalog audio
oPCM digital audio
oSIM card
oKeyboard
oUSB 2.0 slave
oSerial LCD (not available with AT commands)

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Q2686 Wireless CPU®
2.1.5 Operating System
•Real Time Clock (RTC) with calendar
•Battery charger
•Echo cancellation + noise reduction (quadri codec)
•Full GSM or GSM/GPRS Operating System stack
2.1.6 Connection Interfaces
The Q2686 Wireless CPU®has four external connections:
•Three for RF circuit:
oUFL connector
oSoldered connection
oIMP connection
•One for baseband signals:
o100 pin I/O connector.

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Q2686 Wireless CPU®
2.2 Functional Architecture
The global architecture of the Q2686 Wireless CPU®is displayed below:
AUDIO
POWER
UART2
PCM
UART1
USB
SIM 1.8V/3V
EBI
DAC
A
DC
GPIO
SPI1
I2C
SPI2
EXT
_
IT
RF
INTERFACE
SUPPLY INTERFACE
AUDIO FILTER
MEMORY
FLASH / SRAM
RF
FRONT END
RF
TRANSCEIVER
COAX
UFL
IMP
ANTENNA
Q
2
6
8
6
B
O
A
R
D
T
O
B
O
A
R
D
I
N
T
E
R
F
A
C
E
C
O
N
N
E
C
T
O
R
CHARGER
RTC
USB detection
KEYPAD
Figure 1: Functional architecture