Telit Wireless Solutions EVK2 User manual

e
Telit EVK2 User Guide for GC868-DUAL
1vv0300803 Rev.1- May 2009

GC868-DUAL EVK2 User Guide
1vv0300803 Rev.1- May 2009
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This document is relating to the following product:
Model P/N GSM Engine
EVK2 3 990 150 463 -
GC868-DUAL Interface 3 990 250 719 -

GC868-DUAL EVK2 User Guide
1vv0300803 Rev.1- May 2009
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Contents
1 Overview .................................................................................................................... 7
2 Generality .................................................................................................................. 8
2.1 Content of the kit ........................................................................................................... 9
3 Description .............................................................................................................. 10
3.1 PCB characteristics..................................................................................................... 11
3.2 Mechanical characteristics of the assembled PCBs................................................ 11
3.2.1 Mother Board CS1139B .................................................................................................11
3.2.2 GC868-DUAL Interface CS1364 .......................................................................................12
4 Startup procedure................................................................................................... 13
4.1 Golden rule................................................................................................................... 13
5 Insertion of the Interface Boards........................................................................... 14
6 Power supply setting .............................................................................................. 15
6.1 Fixed DC source .......................................................................................................... 15
6.2 Variable DC source...................................................................................................... 16
6.2.1 Suggestion............................................................................................................................16
6.2.2 Coaxial Plug..........................................................................................................................17
6.3 Li-Ion Battery pack and Charger(Not Applicable for GC868-DUAL) ....................... 17
7 Serial interface ........................................................................................................ 18
7.1 Serial Port Setup.......................................................................................................... 19
8 Audio Section.......................................................................................................... 20
8.1 Overview....................................................................................................................... 20
8.1.1 History...................................................................................................................................20
8.1.2 Actual....................................................................................................................................20
8.1.3 The choice ............................................................................................................................21
8.2 Differential and Single Ended..................................................................................... 21
8.2.1 Concepts............................................................................................................................... 21
8.2.2 Benefits and disadvantages .................................................................................................21
8.2.3 Settings.................................................................................................................................22
9 AF Amplifiers Setting.............................................................................................. 23
10 Audio outputs ...................................................................................................... 24
10.1 Low AF Power Mode ................................................................................................... 24
10.1.1 Audio connector................................................................................................................25
10.2 High AF Power Mode................................................................................................... 25
10.2.1 Speaker and Stand-alone Microphone.............................................................................26
10.2.2 Speaker plus Headset ......................................................................................................27

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10.3 Warning ........................................................................................................................ 27
10.3.1 Coil impedance.................................................................................................................27
10.3.2 Earpiece............................................................................................................................27
10.3.3 Speaker ............................................................................................................................27
11 Audio Accessories .............................................................................................. 28
11.1 Headset.........................................................................................................................28
11.2 Stand-alone microphone ............................................................................................ 29
11.3 Speaker.........................................................................................................................29
12 Indication and services ....................................................................................... 30
12.1 Optical Indicators ........................................................................................................ 30
12.1.1 Status Led.........................................................................................................................30
12.2 Switches ....................................................................................................................... 31
12.2.1 POWER ON Switch ..........................................................................................................31
12.2.2 RESET Switch ..................................................................................................................31
13 Connectors pinout............................................................................................... 32
13.1 Motherboard to Module............................................................................................... 32
14 Module Interface Boards..................................................................................... 35
14.1 Generality ..................................................................................................................... 35
14.2 Short Description ........................................................................................................ 35
14.3 Interface Boards List................................................................................................... 35
14.4 Stand-alone setup ....................................................................................................... 35
14.5 Interface connectors ................................................................................................... 36
14.6 Content of the kit ......................................................................................................... 36
14.7 Serial port configuration............................................................................................. 36
14.8 ANTENNA connectors................................................................................................. 37
14.8.1 ANTENNA connector........................................................................................................37
15 GC868-DUAL Interface ........................................................................................ 38
15.1 Stand-alone setup ....................................................................................................... 39
15.2 Interface connectors ................................................................................................... 39
15.3 Content of the kit ......................................................................................................... 39
16 GPIO ports............................................................................................................ 40
16.1 GC868-DUAL Interface (p/n 3990250719) .................................................................. 40
17 SCHEMATICS ....................................................................................................... 41
17.1 EVK2 Mother Board..................................................................................................... 42
17.2 GC868-DUAL Interface board ..................................................................................... 47

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18 Service and firmware update .............................................................................. 49
19 SAFETY RECOMMENDATIONS .......................................................................... 50
20 RoHS Certifications ............................................................................................. 52
20.1 EVK2 Mother Board p/n 3990150463 ......................................................................... 52
20.2 GC868-DUAL Interface p/n 3990250719..................................................................... 53
21 Technical Support ............................................................................................... 54
22 Document Change Log ....................................................................................... 55

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DISCLAIMER
The information contained in this document is the proprietary information of Telit
Communications S.p.A. and its affiliates (“TELIT”). The contents are confidential and any
disclosure to persons other than the officers, employees, agents or subcontractors of the
owner or licensee of this document, without the prior written consent of Telit, is strictly
prohibited.
Telit makes every effort to ensure the quality of the information it makes available.
Notwithstanding the foregoing, Telit 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.
Telit disclaims any and all responsibility for the application of the devices characterized in this
document, and notes that the application of the device must comply with the safety standards
of the applicable country, and where applicable, with the relevant wiring rules.
Telit reserves the right to make modifications, additions and deletions to this document due to
typographical errors, inaccurate information, or improvements to programs and/or equipment
at any time and without notice. Such changes will, nevertheless be incorporated into new
editions of this application note.
All rights reserved.
© 2009 Telit Communications S.p.A.

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1 Overview
Aim of this document is the handling description of the developer’s Evaluation KIT second
edition, a laboratory tool named EVK2 in the rest of this document.
All given information shall be used as a guide and a starting point for properly developing of
your product. Obviously this document cannot embrace all the hardware solutions and
products that may be designed.

GC868-DUAL EVK2 User Guide
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2 Generality
Telit supplies the EVK2 to assist the designer during his developing project phase to develop
his own applications based on Telit modules.
The EVK2 provides a fully functional solution for a complete data/phone application.
The EVK2 is formed by a motherboard CS1139B and GC868-DUAL Interface Boards CS1364
with RF antenna connectors.
The motherboard has multiple power supply possibilities and is equipped with SIM card
housing, RS 232 serial port level translator, direct USB1.1 connection, and two audio
input/output paths.
The only items you have to provide are:
1) a personal computer or microcontroller;
2) a SIM card with a valid Network subscription;
3) the audio accessories;
4) a knowledge of AT commands programming;
5) a power supply.
The connection between the EVK2 and your PC (or other DTE) are realized by standard
RS232 or USB 1.1 ports.
The communications between your application and Telit Modules are realized connecting the
Asynchronous Serial Interfaces of the module’s Base Band Chips (ASC0 and ASC1) through:
Æa double stacked standard DB9 connector, that provides 2 serial communication paths
RS232 protocol up to 115Kbit/sec;
Æa CMOS HUB, that makes both serial interfaces accessible through one physical
connection providing two-way communication in compliance with USB version 1.1 specification
up to 1,5Mbytes/sec.
The second one is the only possibility with portable personal computers that generally have
not the RS232 port.
The development of the applications utilizing Telit modules presents a proper design of all the
interfaces towards and from the module (e.g. power supply, audio paths, level translators),
otherwise a decrease in performance will be introduced or, in the worst case, a wrong design
can even lead to an operating failure of the module.
It is also easily feasible the use of the Telit modules in the so called “ stand-alone configuration
“, connecting the module mounted on its own interface board directly to your application,
through 2x40 pin header connectors.

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2.1 Content of the kit
Please check out the content of your EVK2 kit; if any of the items is missing, please contact
your supplier.
Description Quantity
EVK2 MOTHERBOARD 1
INFORMATION NOTE 1
2 PIN JUMPER FEMALE CONN 18
ASSEMBLED USB A-B CABLE
L-1800
1
RED & BLACK CABLE WITH PLUGS
L-60cm
1
GSM-UMTS MAGNETIC ANTENNA
CABLE RG174 WITH SMA/M
1
Table 1
Figure 1: GC868-DUAL Interface Board (upper) fitted on EVK2 Motherboard (lower).

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3 Description
The motherboard CS1139B can be split into several functional blocks depending on the
implemented function; the following drawings show a block diagram and the displacement of
the main blocks on motherboard.
blok39a3.skd
15/03/2006
USB A0
SO501
USB B1
USB
HUB
USB B0
STACKED
RS232
SO301
USB A1
AUDIO 2
AUDIO 1
PL401
SO401
3,8Vin
PL107
Li-Ion
Batt.Pack
+3,7V
SO101
5-40 Vin
PL101
Level
Translator
Charge PL103
Charge
6V In
PL102
S.E.
AF in/out
BTL
AFout
AT command
NMEA
Power
Saving
PL303
PL301
PL302
Reserved
GPS debug
PL201
PL202
Current
Limiting
PL106
PL105
PL104
Telit Module
PL403
PL402
PL404
500mW
AF PA
Figure 2: Miscellaneous signals, connections and routing on CS1139B.

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CS1139B
MODULE INTERFACE
CONNECTORS
RS232
LEVEL TRANSLATOR
RS232
STACKED
AUDIO
SPEAKER
SERIAL PORTS
SELECTION
USB
RS232
AUDIO LINES
SELECTION
AUDIO 2
AUDIO 1
USB
USB to RS232 INTERFACE
CURRENT
LIMITER
SIM CARD
HOLDER
CHARGER ON
STATUS
LED
ON
RESET
CHARGE
LED
Li-Ion
Battery
BATT REG
REG VAR.
+6V
CHARGER
+3.8V
STEP DOWN
CONVERTER
+(5-40)V
+(5-40)V
Figure 3: CS1139B circuital displacement
3.1 PCB characteristics
Material FR4
Thickness 0, 95 mm
Surface finishing Chemical gold plate Ni 5um/ Au 0,1um
3.2 Mechanical characteristics of the assembled
PCBs
3.2.1 Mother Board CS1139B
Length 100 mm (max 102,6 mm)
Width 160 mm (max 166,10mm)
Height 47,6 mm (included the support with columns)
Weight 200 gr (without any interface)

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3.2.2 GC868-DUAL Interface CS1364
Length 78.74 mm
Width 66.04 mm
Height 18.0 mm
Weight 29.3 gr (without the module)
Note: The overall height for every combination (mother board+interface board)
is still the height of the mother board

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4 Startup procedure
The motherboard factory setup is:
Serial port ………………………… RS232
DC source …………………………+ (5÷40) V /
≥ 1A
Batt.Charger connector (PL106)…On
RX Amplifier………………………..Audio 1
Respect the following order to use the EVK2:
9insert your SIM card
9set properly all jumpers in the desired position
9plug the module Interface board into PL201 and PL202
9connect the antenna to RF connector (on module or on Interface Board)
9connect the audio accessories if required
9plug the external power supply into the right socket, depending from DC source
9switch ON the power supply
9connect the serial cable between your PC and UART (RS232 or USB 1.1)
9push ON/OFF button for at least 2 seconds until the STATUS LED is on
Your EVK2 should now be operational and ready to receive AT Commands.
4.1 Golden rule
When you use USB port, it is very important to respect the following sequences:
start first turning ONyour EVK2 and then connecting it to your PC ;
stop first disconnecting your PC and then turning OFF your EVK2 .

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5 Insertion of the Interface Boards
Every Interface Board must be inserted on CS1139B paying great attention to match the
position of the main connectors; this has been made easy:
Æoptically by a triangle drawn on both printed circuits (except CS1231X) ;
Æmechanically shifting a column out of regular square cross position.
Both guide systems are highlighted by orange color as shown on the next figure.
Figure 4: Positioning Guide Systems of GC868-DUAL Interface Board on CS1139B.
2
1
sense39b
RS232
STACKED
USB
RS232
CS1139B
SPEAKER
1
4039
1
USB
SO101
CS1364
RESET ON
AUDIO 2
AUDIO 1
STATUS
LED
39 40
PL103
30293029
PL102 SO103
12
2
121

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6 Power supply setting
The EVK2 could be powered by different external sources, only one at time. The requested
setting is made inserting the proper jumper connectors in the right position as described in the
following paragraphs.
Be careful to the connections, even if every supply line is protected by a diode against “polarity
reversing” and by a 0Ωresistor against “short circuiting”.
6.1 Fixed DC source
Connect a +3,8V / ≥ 2A fixed DC source to PL101 respecting the polarization; short pin2 &
pin3 - PL104 and pin1&pin2- PL105 by 2 contacts jumper connectors. No other jumpers are
needed.
Figure 5: +3,8V fixed source setting
PL107
PL103
PL105
BATT
SO201
REG
PL106
3.8V
PL104
+3,8V INPUT
PL101
SO101
PL102
5-40V
3_8DC.skd

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6.2 Variable DC source
Connect a + (5÷40) V / ≥ 1A variable DC source to PL102 (by wires) or to SO101 (by coaxial
plug), with care to the polarities. Short pin1& pin2-PL104 and pin1& pin2-PL105 by inserting 2
contacts jumper connectors.
No other jumpers are needed.
PL105
+(5-40)V Source
by wires
+(5-40)V Source
by Plug
SO201
PL106
BATT
REG
5_40DC.skd
PL107
PL105
PL104
3.8V
PL103
5-40V
PL101
SO101
PL102
+(5-40)V in
SO201
PL106
BATT
REG
PL107
PL104
PL103
3.8V
PL101
5-40V
+(5-40)V in
PL102
SO101
Figure 6: Variable DC source setting
6.2.1 Suggestion
It is useful set the variable DC source at 6V minimum to avoid problems with voltage drops
due to the length of the wires or the conductors gauge .

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6.2.2 Coaxial Plug
The figure 7 shows the connections of the Power Plug of left part of figure 6.
inner contact
outer contact
powerjck.skd
Figure 7: Coaxial “Power Plug” connection.
6.3 Li-Ion Battery pack and Charger(Not
Applicable for GC868-DUAL)
Connect a Li-Ion battery pack to PL107 with care to the polarity then short pin2&pin3- PL105
by inserting the 2 contacts jumper connector.
If the battery pack needs to be recharged, connect a +6V /
≥ 0,5A fixed DC source to PL103,
with care to the polarity; short PL106 inserting a 2 contacts jumper connector as shown in
figure 8: the yellow CHARGE LED will be on during the initial phase of charge. If you remove
the battery pack when the charge stops (no current flows), immediately REMOVE also the
jumper of PL106.
SO201
BATT
REG
CHARGER ON
PL106
liion.skd
3.8V
PL105
PL107
PL103
CHARGE
LED
SO101
PL101
PL104
5-40V
Li-Ion Battery Pack
Li-Ion DC Source plus
Battery Charger
+6V IN (Charger)
Figure 8: Battery Pack and Battery Charger wired connections and setting.
NEVER CONNECT any Battery charging source to PL103 of CS1139B WITHOUT the Battery Pack

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7 Serial interface
The following figure shows the architecture of the serial ports.
8
8
SO301
Upper
U303 8
+5V USB
6MHz
USB (1)
USB (2) spare
U502
2
HUB
USB-B
SO501
XTAL2
2
U504
3V LDO
U505
USB(0)
SO301
Lower
ASC1ASC0
2
2
+3,7V
LDO
on/off 3V LDO
U506
Port B (1)
PWR Ena
U509
VCCIO
3 Port A (1)
2
VCCIO
PWR Ena
2
Port A (0)
GPS debug
R0
3
SERIAL9.SKD
RESERVED
R0 2
SO301
U503
8
Port B (0)
U304 2
NMEA (GM862-GPS)
2
AT commands
PROGRAM
Figure 9: Serial ports block diagram.

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7.1 Serial Port Setup
Communications between your application and the Telit modules are allowed connecting the
DTE to the Asynchronous Serial Interfaces of Base-Band Chip, ASC0 and ASC1, through the
stacked standard RS232 communications port (double 9way D-socket connector at slow data rates of
RS232 protocol)or a standard USB-B Series receptacle (at higher data rates of USB1.1 specification
through a CMOS HUB that realizes a multiple attachment point device).
ATcommands/PROGRAM
LOWER
UPPER
SERVICE
CS1139B
ddb9b.skd
6789
12345
6789
12345
DB9
Stacked
Figure 10: Double 9way D-Socket Connector
The selection is made short circuiting PL302&PL303 (RS232 mode) or PL302&PL301 (USB 1.1
mode)by 10 pieces of 2 contacts jumpers. This solution has been implemented because you
can isolate every single line during the development.
CS1139B
RS232
STACKED
SO301
RS232
USB
1
RS232 MODE
39 40
PL303
PL302
PL301
PL502
USB
SO501
SO101
2
1
CS1139B
USB MODE
RS232
STACKED
SO301
RS232
USB
usb_rsb.skd
39 40
PL303
PL301
PL302
USB
SO501
PL502
Figure 11: Serial Ports selection

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8 Audio Section
8.1 Overview
The BaseBand chip of our modules provides two audio paths both in receive and in transmit
sections, which could be active only one at time.
To turn on your well-suited section on EVK2, please refer to “AF Amplifiers Setting “paragraph
and followings.
To know which are the suggested performances of the EVK2 audio transducers, refer to
“Audio Accessories “paragraph.
8.1.1 History
The Baseband chip of our modules was developed for the cellular phones, which needed two
separated amplifiers both in RX and in TX section. A couple of amplifiers had to be used with
internal audio transducers (Handset mode, HS) while the other couple of amplifiers must be used
with external audio transducers (Handsfree mode, HF).
8.1.1.1 Transducers definitions
Headsets are transducers that receive an electrical signal from a receiver and use speakers
placed in close proximity to the ears to convert the signal into audible sound waves.
In the context of telecommunication, the word Headset is also commonly understood to refer
to a combination of Headphone and Microphone used for two-way communication, like with a
mobile phone.
Earphones are small Headphones that are placed directly outside of the ear canal, but without
fully enveloping it. They are generally inexpensive and are favored for their portability and
convenience.
Earpiece
A part whether of a telephone receiver or hearing aid, that fits in or is held next to the ear.
8.1.2 Actual
The HS and HF definitions have been kept in the Software and on the schematics of theTelit
modules. But with EVK2 we will refer to Audio1 or Audio2 section instead of Handset and
Handsfree respectively, remembering that:
•they can have fully equivalent electrical performances (like the two microphone amplifiers)
•they can activate the same functionalities (like the Echo Canceller module)
•they can offer slightly different performances (like the two speaker buffering stages)