Telit Communications S p A GC864 Quad-Band GSM/GPRS module - Type: GC864 User Manual GC864 Hardware User Guide

Telit Communications S.p.A. Quad-Band GSM/GPRS module - Type: GC864 GC864 Hardware User Guide

Users Manual

Download:
Mirror Download [FCC.gov]
Document ID	687742
Application ID	qmG8RFsZvRCFcs4CY4AjcQ==
Document Description	Users Manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	87.6kB (1095035 bits)
Date Submitted	2006-07-28 00:00:00
Date Available	2006-07-28 00:00:00
Creation Date	2006-06-16 14:48:01
Producing Software	Acrobat Distiller 7.0.5 (Windows)
Document Lastmod	2006-06-16 14:54:37
Document Title	GC864 Hardware User Guide
Document Creator	Acrobat PDFMaker 7.0.5 for Word
Document Author:	fabriziodr

GC864 Hardware User Guide
GC864-PY, GC864-QUAD
1vv0300733 Rev. 0 - 12/06/06
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Contents
Overview ...........................................................................................................................4
Hardware Commands ......................................................................................................5
2.1
Turning ON the GC864 ...........................................................................................................5
2.2
Turning OFF the GC864 ........................................................................................................7
2.2.1
2.3
Hardware shutdown..........................................................................................................................7
Hardware Unconditional Reboot ...........................................................................................7
Power Supply ...................................................................................................................9
3.1
Power Supply Requirements .................................................................................................9
3.2
General Design Rules ..........................................................................................................10
3.2.1
Electrical design Guidelines........................................................................................................... 10
3.2.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 10
3.2.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 12
3.2.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 13
3.2.1.4 Battery Charge control Circuitry Design Guidelines .................................................................. 13
3.2.2
Thermal Design Guidelines ........................................................................................................... 15
3.2.3
Power Supply PCB layout Guidelines ........................................................................................... 16
Antenna...........................................................................................................................17
4.1
Antenna Requirements ........................................................................................................17
4.2
GC864 Antenna Connector ..................................................................................................17
4.3
Antenna installation Guidelines ..........................................................................................18
GC864 pins allocation....................................................................................................19
NOTE: RESERVED pins must not be connected..........................................................................21
Serial Port .......................................................................................................................22
6.1
RS232 level translation ........................................................................................................24
6.2
5V UART level translation....................................................................................................26
Audio Section Overview ................................................................................................28
7.1
Microphone paths characteristic and requirements .........................................................30
7.2
General Design Rules ..........................................................................................................33
7.3
Other considerations. ..........................................................................................................33
7.4
Microphone Biasing .............................................................................................................34
7.4.1
7.4.2
Balanced Microphone biasing........................................................................................................ 34
Unbalanced Microphone biasing ................................................................................................... 35
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 2 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
7.5
Microphone buffering...........................................................................................................37
7.5.1
7.5.2
OUTPUT LINES (Speaker)..............................................................................................42
8.1
Short description..................................................................................................................42
8.2
Output lines characteristics . .............................................................................................43
8.3
General Design rules............................................................................................................44
8.3.1
Buffered Balanced Mic................................................................................................................... 37
Buffered Unbalanced (Single Ended) Microphone . ...................................................................... 39
Noise Filtering ................................................................................................................................ 44
8.4
Handset earphone design....................................................................................................45
8.5
Hands-free earphone (low power) design ..........................................................................46
8.6
Car Kit speakerphone design..............................................................................................47
External SIM Holder .......................................................................................................48
9.1
SIM DESIGN GUIDES............................................................................................................48
10 General Purpose I/O.......................................................................................................50
10.1
Using a GPIO pad as INPUT .............................................................................................50
10.2
Using a GPIO pad as OUTPUT .........................................................................................50
10.3
Using the Alarm Output GPIO_06/ALARM......................................................................51
10.4
Using the Buzzer Output GPIO_07/BUZZER...................................................................51
11 Camera ............................................................................................................................52
11.1
Camera characteristics ....................................................................................................52
11.1.1
Camera interface connectors......................................................................................................... 52
11.1.2 ............................................................................................................................................................. 53
11.1.3 ............................................................................................................................................................. 53
11.1.4 ............................................................................................................................................................. 53
11.1.5
EVB for Transchip camera support ............................................................................................... 54
11.1.6
Example usage script for camera .................................................................................................. 55
12 Conformity Assessment Issues ....................................................................................56
13 SAFETY RECOMMANDATIONS.....................................................................................57
14 Document Change Log ..................................................................................................58
Annex A – EVK2 schematics ...............................................................................................59
Annex B - Camera EVB schematics ....................................................................................65
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 3 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Overview
The aim of this document is the description of some hardware solutions useful for developing a product with the
Telit GC864 module.
In this document all the basic functions of a mobile phone will be taken into account; for each one of them a
proper hardware solution will be suggested and eventually the wrong solutions and common errors to be
avoided will be evidenced. Obviously this document can not embrace the whole hardware solutions and
products that may be designed. The wrong solutions to be avoided shall be considered as mandatory, while the
suggested hardware configurations shall not be considered mandatory, instead the information given shall be
used as a guide and a starting point for properly developing your product with the Telit GC864 module. For
further hardware details that may not be explained in this document refer to the Telit GC864 Product Description
document where all the hardware information is reported.
NOTICE
(EN) The integration of the GC864 GSM/GPRS cellular module within user application shall be
done according to the design rules described in this manual.
(IT) L’integrazione del modulo cellulare GSM/GPRS GC864 all’interno dell’applicazione
dell’utente dovrà rispettare le indicazioni progettuali descritte in questo manuale.
(DE) Die Integration des GC864 GSM/GPRS Mobilfunk-Moduls in ein Gerät muß gemäß der in
diesem Dokument beschriebenen Konstruktionsregeln erfolgen
(SL) Integracija GSM/GPRS GC864 modula v uporabniški aplikaciji bo morala upoštevati
projektna navodila, opisana v tem priročniku.
(SP) La utilización del modulo GSM/GPRS GC864 debe ser conforme a los usos para los
cuales ha sido diseñado descritos en este manual del usuario
(FR) L'intégration du module cellulaire GC864 GSM/GPRS dans l'application de l'utilisateur
sera faite selon les règles de conception décrites dans ce manuel
(HE)
The information presented in this document is believed to be accurate and reliable. However, Telit
Communication assumes no responsibility for its use, nor any infringement of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent rights of
Telit Communication other than for circuitry embodied in Telit products. This document is subject to change
without notice.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 4 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Hardware Commands
2.1 Turning ON the GC864
To turn on the GC864 the pad ON# must be tied low for at least 1 second and then released.
The maximum current that can be drained from the ON# pad is 0,1 mA.
A simple circuit to do it is:
ON#
R1
Q1
Power ON impulse
R2
GND
NOTE: don't use any pull up resistor on the ON# line, it is internally pulled up. Using pull up
resistor may bring to latch up problems on the GC864 power regulator and improper power
on/off of the module. The line ON# must be connected only in open collector configuration.
NOTE: In this document all the lines that are inverted, hence have active low signals are
labeled with a name that ends with a "#" or with a bar over the name.
NOTE: The GC864 turns fully on also by supplying power to the Charge pad (provided there's
a battery on the VBATT pads).
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 5 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
For example:
1- Let's assume you need to drive the ON# pad with a totem pole output of a +3/5 V microcontroller
(uP_OUT1):
2- Let's assume you need to drive the ON# pad directly with an ON/OFF button:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 6 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
2.2 Turning OFF the GC864
The turning off of the device can be done in three ways:
• by software command (see GC864 Software User Guide)
• by hardware shutdown
When the device is shut down by software command or by hardware shutdown, it issues to the
network a detach request that informs the network that the device will not be reachable any more.
2.2.1 Hardware shutdown
To turn OFF the GC864 the pad ON# must be tied low for at least 1 second and then released.
The same circuitry and timing for the power on shall be used.
The device shuts down after the release of the ON# pad.
TIP: To check if the device has powered off, the hardware line PWRCTL should be monitored.
When PWRCTL goes low, the device has powered off.
2.3 Hardware Unconditional Reboot
To unconditionally Reboot the GC864, the pad RESET# must be tied low for at least 200 milliseconds
and then released.
The maximum current that can be drained from the ON# pad is 0,15 mA.
A simple circuit to do it is:
RESET#
Unconditional Reboot
impulse
GND
NOTE: don't use any pull up resistor on the RESET# line nor any totem pole digital output.
Using pull up resistor may bring to latch up problems on the GC864 power regulator and
improper functioning of the module. The line RESET# must be connected only in open
collector configuration.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 7 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
TIP: The unconditional hardware reboot should be always implemented on the boards and
software should use it as an emergency exit procedure.
For example:
1- Let's assume you need to drive the RESET# pad with a totem pole output of a +3/5 V
microcontroller (uP_OUT2):
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 8 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
3 Power Supply
The power supply circuitry and board layout are a very important part in the full product design and
they strongly reflect on the product overall performances, hence read carefully the requirements and
the guidelines that will follow for a proper design.
3.1 Power Supply Requirements
The GC864 power requirements are:
• Nominal Supply Voltage:
• Max Supply Voltage:
• Supply voltage range:
• Max Peak current consumption (impulsive):
• Max Average current consumption during GPRS transmission (rms):
• Max Average current consumption during VOICE/CSD transmission (rms):
• Average current during Power Saving:
• Average current during idle (Power Saving disabled)
3.8 V
4.2 V
3.4 V - 4.2 V
1.9 A
500 mA
270 mA
≈ 4 mA
≈ 19 mA
The GSM system is made in a way that the RF transmission is not continuous, else it is packed into
bursts at a base frequency of about 216 Hz, the relative current peaks can be as high as about 2A.
Therefore the power supply has to be designed in order to withstand with these current peaks without
big voltage drops; this means that both the electrical design and the board layout must be designed for
this current flow.
If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the
supply; this will reflect on all the audio paths producing an audible annoying noise at 216 Hz; if the
voltage drop during the peak current absorption is too much, then the device may even shutdown as a
consequence of the supply voltage drop.
TIP: The electrical design for the Power supply should be made ensuring it will be capable of a
peak current output of at least 2 A.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 9 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
3.2 General Design Rules
The principal guidelines for the Power Supply Design embrace three different design steps:
- the electrical design
- the thermal design.
- the PCB layout.
3.2.1 Electrical design Guidelines
The electrical design of the power supply depends strongly from the power source where this power is
drained. We will distinguish them into three categories:
• +5V input (typically PC internal regulator output)
• +12V input (typically automotive)
• Battery
3.2.1.1 + 5V input Source Power Supply Design Guidelines
•
•
•
•
•
The desired output for the power supply is 3.8V, hence there's not a big difference between the
input source and the desired output and a linear regulator can be used. A switching power supply
will not be suited because of the low drop out requirements.
When using a linear regulator, a proper heat sink shall be provided in order to dissipate the power
generated.
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks close to the GC864, a 100μF tantalum capacitor is usually suited.
Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at
least 10V.
A protection diode should be inserted close to the power input, in order to save the GC864 from
power polarity inversion.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 10 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
An example of linear regulator with 5V input is:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 11 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
3.2.1.2 + 12V input Source Power Supply Design Guidelines
•
•
•
•
•
•
•
The desired output for the power supply is 3.8V, hence due to the big difference between the input
source and the desired output, a linear regulator is not suited and shall not be used. A switching
power supply will be preferable because of its better efficiency especially with the 2A peak current
load represented by the GC864.
When using a switching regulator, a 500kHz or more switching frequency regulator is preferable
because of its smaller inductor size and its faster transient response. This allows the regulator to
respond quickly to the current peaks absorption.
For car PB battery the input voltage can rise up to 15,8V and this should be kept in mind when
choosing components: all components in the power supply must withstand this voltage.
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks, a 100μF tantalum capacitor is usually suited.
Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at
least 10V.
For Car applications a spike protection diode should be inserted close to the power input, in order
to clean the supply from spikes.
A protection diode should be inserted close to the power input, in order to save the GC864 from
power polarity inversion. This can be the same diode as for spike protection.
An example of switching regulator with 12V input is:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 12 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
3.2.1.3 Battery Source Power Supply Design Guidelines
•
The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is
4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit
GC864 module.
The three cells Ni/Cd or Ni/MH 3,6 V Nom. battery types or 4V PB types MUST NOT BE USED
DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the
GC864 and damage it.
NOTE: DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GC864.
Their use can lead to overvoltage on the GC864 and damage it. USE ONLY Li-Ion battery types.
• A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks, a 100μF tantalum capacitor is usually suited.
• Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.
• A protection diode should be inserted close to the power input, in order to save the GC864 from
power polarity inversion. Otherwise the battery connector should be done in a way to avoid polarity
inversions when connecting the battery.
• The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A; the
suggested capacity is from 500mAh to 1000mAh.
3.2.1.4 Battery Charge control Circuitry Design Guidelines
The charging process for Li-Ion Batteries can be divided into 4 phases:
• Qualification and trickle charging
• Fast charge 1 - constant current
• Final charge - constant voltage or pulsed charging
• Maintenance charge
The qualification process consists in a battery voltage measure, indicating roughly its charge status. If
the battery is deeply discharged, that means its voltage is lower than the trickle charging threshold,
then the charge must start slowly possibly with a current limited pre-charging process where the
current is kept very low with respect to the fast charge value: the trickle charging.
During the trickle charging the voltage across the battery terminals rises; when it reaches the fast
charge threshold level the charging process goes into fast charge phase.
During the fast charge phase the process proceeds with a current limited charging; this current limit
depends on the required time for the complete charge and from the battery pack capacity. During this
phase the voltage across the battery terminals still raises but at a lower rate.
Once the battery voltage reaches its maximum voltage then the process goes into its third state: Final
charging. The voltage measure to change the process status into final charge is very important. It
must be ensured that the maximum battery voltage is never exceeded, otherwise the battery may be
damaged and even explode. Moreover for the constant voltage final chargers, the constant voltage
phase (final charge) must not start before the battery voltage has reached its maximum value,
otherwise the battery capacity will be highly reduced.
The final charge can be of two different types: constant voltage or pulsed. GC864 uses constant
voltage.
The constant voltage charge proceeds with a fixed voltage regulator (very accurately set to the
maximum battery voltage) and hence the current will decrease while the battery is becoming charged.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 13 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
When the charging current falls below a certain fraction of the fast charge current value, then the
battery is considered fully charged, the final charge stops and eventually starts the maintenance.
The pulsed charge process has no voltage regulation, instead the charge continues with pulses.
Usually the pulse charge works in the following manner: the charge is stopped for some time, let's say
few hundreds of ms, then the battery voltage will be measured and when it drops below its maximum
value a fixed time length charging pulse is issued. As the battery approaches its full charge the off
time will become longer, hence the duty-cycle of the pulses will decrease. The battery is considered
fully charged when the pulse duty-cycle is less than a threshold value, typically 10%, the pulse charge
stops and eventually the maintenance starts.
The last phase is not properly a charging phase, since the battery at this point is fully charged and the
process may stop after the final charge. The maintenance charge provides an additional charging
process to compensate for the charge leak typical of a Li-Ion battery. It is done by issuing pulses with
a fixed time length, again few hundreds of ms, and a duty-cycle around 5% or less.
This last phase is not implemented in the GC864 internal charging algorithm, so that the battery once
charged is left discharging down to a certain threshold so that it is cycled from full charge to slight
discharge even if the battery charger is always inserted. This guarantees that anyway the remaining
charge in the battery is a good percentage and that the battery is not damaged by keeping it always
fully charged (Li-Ion rechargeable battery usually deteriorate when kept fully charged).
Last but not least, in some applications it is highly desired that the charging process restarts when the
battery is discharged and its voltage drops below a certain threshold, GC864 internal charger does it.
As you can see, the charging process is not a trivial task to be done; moreover all these operations
should start only if battery temperature is inside a charging range, usually 5°C - 45°C.
The GC864 measures the temperature of its internal component, in order to satisfy this last
requirement, it's not exactly the same as the battery temperature but in common application the two
temperature should not differ too much and the charging temperature range should be guaranteed.
NOTE: For all the threshold voltages, inside the GC864 all threshold are fixed in order to
maximize Li-Ion battery performances and do not need to be changed.
NOTE: In this application the battery charger input current must be limited to less than 400mA.
This can be done by using a current limited wall adapter as the power source.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 14 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
3.2.2 Thermal Design Guidelines
The thermal design for the power supply heat sink should be done with the following specifications:
• Average current consumption during transmission @PWR level max (rms):
500mA
• Average current consumption during transmission @ PWR level min (rms):
100mA
• Average current during Power Saving:
4mA
• Average current during idle (Power Saving disabled)
19mA
NOTE: The average consumption during transmissions depends on the power level at which
the device is requested to transmit by the network. The average current consumption hence
varies significantly.
TIP: The thermal design for the Power supply should be made keeping a average consumption
at the max transmitting level during calls of 500mA rms.
Considering the very low current during idle, especially if Power Saving function is enabled, it is
possible to consider from the thermal point of view that the device absorbs current significantly only
during calls.
If we assume that the device stays into transmission for short periods of time (let's say few minutes)
and then remains for a quite long time in idle (let's say one hour), then the power supply has always
the time to cool down between the calls and the heat sink could be smaller than the calculated one for
500mA maximum RMS current, or even could be the simple chip package (no heat sink).
Moreover in the average network conditions the device is requested to transmit at a lower power level
than the maximum and hence the current consumption will be less than the 500mA, being usually
around 150mA.
For these reasons the thermal design is rarely a concern and the simple ground plane where the
power supply chip is placed can be enough to ensure a good thermal condition and avoid overheating.
For the heat generated by the GC864, you can consider it to be during transmission 1W max during
CSD/VOICE calls and 2W max during class10 GPRS upload.
This generated heat will be mostly conducted to the ground plane under the GC864, you must ensure
that your application can dissipate it.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 15 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
3.2.3 Power Supply PCB layout Guidelines
As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the
output to cut the current peaks and a protection diode on the input to protect the supply from spikes
and polarity inversion. The placement of these components is crucial for the correct working of the
circuitry. A misplaced component can be useless or can even decrease the power supply
performances.
• The Bypass low ESR capacitor must be placed close to the Telit GC864 power input pads or in the
case the power supply is a switching type it can be placed close to the inductor to cut the ripple
provided the PCB trace from the capacitor to the GC864 is wide enough to ensure a dropless
connection even during the 2A current peaks.
• The protection diode must be placed close to the input connector where the power source is
drained.
• The PCB traces from the input connector to the power regulator IC must be wide enough to ensure
no voltage drops occur when the 2A current peaks are absorbed. Note that this is not made in
order to save power loss but especially to avoid the voltage drops on the power line at the current
peaks frequency of 216 Hz that will reflect on all the components connected to that supply,
introducing the noise floor at the burst base frequency. For this reason while a voltage drop of 300400 mV may be acceptable from the power loss point of view, the same voltage drop may not be
acceptable from the noise point of view. If your application doesn't have audio interface but only
uses the data feature of the Telit GC864, then this noise is not so disturbing and power supply
layout design can be more forgiving.
• The PCB traces to the GC864 and the Bypass capacitor must be wide enough to ensure no
significant voltage drops occur when the 2A current peaks are absorbed. This is for the same
reason as previous point. Try to keep this trace as short as possible.
• The PCB traces connecting the Switching output to the inductor and the switching diode must be
kept as short as possible by placing the inductor and the diode very close to the power switching
IC (only for switching power supply). This is done in order to reduce the radiated field (noise) at the
switching frequency (100-500 kHz usually).
• The use of a good common ground plane is suggested.
• The placement of the power supply on the board should be done in such a way to guarantee that
the high current return paths in the ground plane are not overlapped to any noise sensitive circuitry
as the microphone amplifier/buffer or earphone amplifier.
• The power supply input cables should be kept separate from noise sensitive lines such as
microphone/earphone cables.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 16 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
4 Antenna
The antenna connection and board layout design are the most important part in the full product design
and they strongly reflect on the product overall performances, hence read carefully and follow the
requirements and the guidelines for a proper design.
4.1 Antenna Requirements
As suggested on the Product Description the antenna for a Telit GC864 device shall fulfill the following
requirements:
ANTENNA REQUIREMENTS
Standard Dual Band GSM/DCS frequency
range or
Standard Tri Band GSM/DCS/PCS
frequency range if used for all three bands
136 MHz in GSM 850 and 900 & 170 MHz in
Bandwidth
DCS & 140 MHz PCS band
Gain < 3dBi
Gain
50 ohm
Impedance
> 2 W peak power
Input power
<= 10:1
VSWR absolute
max
<= 2:1
VSWR
recommended
Frequency range
4.2 GC864 Antenna Connector
The GC864 module is equipped with a 50 Ohm RF connector from Murata,
GSC type P/N MM9329-2700B.
The counterpart suitable is Murata MXTK92 Type or MXTK88 Type.
Moreover, the GC864 has the antenna pads on the backside of the PCB. This allows the manual
soldering of the coaxial cable directly on the back side of the PCB. However, the soldering is not an
advisable solution for a reliable connection of the antenna.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 17 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
4.3 Antenna installation Guidelines
•
•
•
•
Install the antenna in a place covered by the GSM signal.
The Antenna must be installed to provide a separation distance of at least 20 cm from all persons
and must not be co-located or operating in conjunction with any other antenna or transmitter;
Antenna shall not be installed inside metal cases
Antenna shall be installed also according Antenna manufacturer instructions.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 18 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
5 GC864 pins allocation
The GC864 uses an 80 pin Molex p.n. 53949-0878 male connector for the connections with the external
applications. This connector matches the 54150-0878 model.
Pin
Signal
I/O
Function
Internal
Pull up
Type
Power Supply
VBATT
Main power supply
Power
VBATT
Main power supply
Power
VBATT
Main power supply
Power
VBATT
Main power supply
Power
GND
Ground
Power
GND
Ground
Power
GND
Ground
Power
Audio
100KΩ
CMOS 2.8V
AXE
Handsfree switching
EAR_HF+
AO
Handsfree ear output, phase +
Audio
10
EAR_HF-
AO
Handsfree ear output, phase -
Audio
11
EAR_MT+
AO
Handset earphone signal output, phase +
Audio
12
EAR_MT-
AO
Handset earphone signal output, phase -
Audio
13
MIC_HF+
AI
Handsfree microphone input; phase +, nominal level 3mVrms
Audio
14
MIC_HF-
AI
Handsfree microphone input; phase -, nominal level 3mVrms
Audio
15
MIC_MT+
AI
Handset microphone signal input; phase+, nominal level 50mVrms
Audio
16
MIC_MT-
AI
Handset microphone signal input; phase-, nominal level 50mVrms
Audio
SIM Card Interface
18
SIMVCC
External SIM signal – Power supply for the SIM
1.8/3V
19
SIMRST
External SIM signal – Reset
1.8/3V
20
SIMIO
I/O
External SIM signal - Data I/O
1.8/3V
21
SIMIN
External SIM signal - Presence (active low)
22
SIMCLK
External SIM signal – Clock
47KΩ
1.8/3V
1.8/3V
Trace
23
RX_TRACE
RX Data for debug monitor
CMOS 2.8V
24
TX_TRACE
TX Data for debug monitor
CMOS 2.8V
Prog. / Data + Hw Flow Control
25
C103/TXD
Serial data input (TXD) from DTE
CMOS 2.8V
26
C104/RXD
Serial data output to DTE
CMOS 2.8V
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 19 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Pin
Signal
I/O
Function
Internal
Pull up
Type
27
C107/DSR
Output for Data set ready signal (DSR) to DTE
CMOS 2.8V
28
C106/CTS
Output for Clear to send signal (CTS) to DTE
CMOS 2.8V
29
C108/DTR
Input for Data terminal ready signal (DTR) from DTE
CMOS 2.8V
30
C125/RING
Output for Ring indicator signal (RI) to DTE
CMOS 2.8V
31
C105/RTS
Input for Request to send signal (RTS) from DTE
CMOS 2.8V
32
C109/DCD
Output for Data carrier detect signal (DCD) to DTE
CMOS 2.8V
IIC
35
36
CAM_SCL /
IIC_SCL
CAM_SDA /
IIC_SDA
I/O
Camera IIC interface / Configurable GPIO
CMOS 2.8V
I/O
Camera IIC interface / Configurable GPIO
CMOS 2.8V
DAC and ADC
37
ADC_IN1
AI
Analog/Digital converter input
A/D
38
ADC_IN2
AI
Analog/Digital converter input
A/D
39
ADC_IN3
AI
Analog/Digital converter input
A/D
40
DAC_OUT
AO
Digital/Analog converter output
D/A
Miscellaneous Functions
44
MON1_CAM
I/O
MON1 / Camera interface
CMOS 2.8V
45
STAT_LED
Status indicator led
CMOS 1.8V
46
GND
Ground
Ground
49
PWRMON
Power ON Monitor
CMOS 2.8V
50
VAUX1
Power output for external accessories
51
CHARGE
AI
Charger input (*)
Power
52
CHARGE
AI
Charger input (*)
Power
53
ON/OFF*
54
RESET*
Input command for switching power ON or OFF (toggle command).
The pulse to be sent to the GC864 must be equal or greater than 1
second.
Reset input
55
VRTC
AO
VRTC Backup capacitor
47KΩ
Pull up to VBATT
Power
Telit GPIO
56
TGPIO_19
I/O
Telit GPIO19 Configurable GPIO
CMOS 2.8V
57
TGPIO_11
I/O
Telit GPIO11 Configurable GPIO
CMOS 2.8V
58
TGPIO_20
I/O
Telit GPIO20 Configurable GPIO
CMOS 2.8V
59
TGPIO_04
I/O
Telit GPIO4 Configurable GPIO
CMOS 2.8V
60
TGPIO_14
I/O
Telit GPIO14 Configurable GPIO
CMOS 2.8V
61
TGPIO_15
I/O
Telit GPIO15 GPIO pin
CMOS 2.8V
62
TGPIO_12
I/O
Telit GPIO12 Configurable GPIO
CMOS 2.8V
63
TGPIO_10
I/O
Telit GPIO10 I/O pin
CMOS 2.8V
64
TGPIO_22
I/O
Telit GPIO22 Configurable GPIO
CMOS 1.8V
65
TGPIO_18
I/O
Telit GPIO18 I/O pin
CMOS 2.8V
66
TGPIO_03
I/O
Telit GPIO3 Configurable GPIO
CMOS 2.8V
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 20 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Pin
Signal
I/O
Function
Internal
Pull up
Type
67
TGPIO_08 / CAM_ON I/O
Telit GPIO8 Configurable GPIO / Camera Interface
CMOS 2.8V
68
TGPIO_06 / ALARM
I/O
Telit GPIO6 Configurable GPIO / ALARM
CMOS 2.8V
69
TGPIO_23
I/O
CMOS 2.8V
70
TGPIO_01
I/O
Reserved to detect ON/OFF. It is physically connected to pin 49
(PWRMON)
Telit GPIO1 Configurable GPIO
71
TGPIO_17
I/O
Telit GPIO17 GPIO pin
CMOS 2.8V
72
TGPIO_21
I/O
Telit GPIO21 Configurable GPIO
CMOS 2.8V
73
TGPIO_07 / BUZZER
I/O
Telit GPIO7 Configurable GPIO / Buzzer
CMOS 2.8V
74
TGPIO_02 / JDR
I/O
Telit GPIO02 I/O pin / Jammer detect report
CMOS 2.8V
75
TGPIO_16
I/O
Telit GPIO16 Configurable GPIO
CMOS 2.8V
76
TGPIO_09 /
CAM_RST
TGPIO_13
I/O
Telit GPIO9 GPIO I/O pin 7 Camera Interface
CMOS 2.8V
I/O
Telit GPIO13 Configurable GPIO
CMOS 2.8V
TGPIO_05 /
RFTXMON
I/O
Telit GPIO05 Configurable GPIO / Transmitter ON monitor
CMOS 2.8V
77
78
CMOS 2.8V
RESERVED
17
33
34
41
42
43
47
48
79
80
NOTE: RESERVED pins must not be connected
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 21 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
6 Serial Port
The serial port on the Telit GC864 is the core of the interface between the module and OEM
hardware. Several configurations can be designed for the serial port on the OEM hardware, but the
most common are:
- RS232 PC com port
- microcontroller UART @ 2.8V - 3V (Universal Asynchronous Receive Transmit)
- microcontroller UART@ 5V or other voltages different from 2.8V
Depending from the type of serial port on the OEM hardware a level translator circuit may be needed
to make the system work. The only configuration that doesn't need a level translation is the 2.8V
UART.
The serial port on the GC864 is a +2.8V UART with all the 7 RS232 signals. It differs from the PCRS232 in the signal polarity (RS232 is reversed) and levels. The levels for the GC864 UART are the
CMOS levels:
Absolute Maximum Ratings -Not Functional
Parameter
Min
Max
Input level on any
-0.3V
digital pad when on
Input voltage on
-0.3V
analog pads when on
+3.75V
+3.0 V
Operating Range - Interface levels (2.8V CMOS)
Level
Min
Max
Input high level
VIH
2.1V
Input low level VIL 0V
Output high level VOH 2.2V
Output low level VOL 0V
3.3V
0.5V
3.0V
0.35V
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 22 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
The signals of the GC864 serial port are:
RS232 Pin
Number
GC864
Pad
Number
25
Signal
Type
C103/TXD
Name
Usage
Serial data input (TXD) from DTE
Input receive of the GC864 UART
Output transmit line of GC864 UART
26
C104/RXD
Serial data output to DTE
27
C107/DSR
Output for Data set ready signal (DSR) to DTE
28
C106/CTS
29
C108/DTR
30
C125/RING
31
C105/RTS
32
C109/DCD
5,6,7
GND
Output from the GC864 that indicates the
module is ready
Output for Clear to send signal (CTS) to DTE
Output from the GC864 that controls the
Hardware flow control
Input for Data terminal ready signal (DTR) from
Input to the GC864 that controls the DTE
DTE
READY condition
Output for Ring indicator signal (RI) to DTE
Output from the GC864 that indicates the
incoming call condition
Input for Request to send signal (RTS) from DTE Input to the GC864 that controls the
Hardware flow control
Output for Data carrier detect signal (DCD) to
Output from the GC864 that indicates the
DTE
carrier presence
Ground
ground
NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on
the GC864 side these signal are on the opposite direction: TXD on the application side will be
connected to the receive line (here named TXD/ rx_uart ) of the GC864 serial port and
viceversa for RX.
TIP: For a minimum implementation, only the TXD and RXD lines can be connected, the other
lines can be left open provided a software flow control is implemented.
The signals in the UART connector on the EVK2 are:
DCD
TXD
GND
RTS
RI
RXD
DTR
DSR
CTS
GND
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 23 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
6.1 RS232 level translation
In order to interface the Telit GC864 with a PC com port or a RS232 (EIA/TIA-232) application a level
translator is required. This level translator must
- invert the electrical signal in both directions
- change the level from 0/3V to +15/-15V
Actually, the RS232 UART 16450, 16550, 16650 & 16750 chipsets accept signals with lower levels on
the RS232 side (EIA/TIA-562) , allowing for a lower voltage-multiplying ratio on the level translator.
Note that the negative signal voltage must be less than 0V and hence some sort of level translation is
always required.
The simplest way to translate the levels and invert the signal is by using a single chip level translator.
There are a multitude of them, differing in the number of driver and receiver and in the levels (be sure
to get a true RS232 level translator not a RS485 or other standards).
By convention the driver is the level translator from the 0-3V UART level to the RS232 level, while the
receiver is the translator from RS232 level to 0-3V UART.
In order to translate the whole set of control lines of the UART you will need:
- 5 driver
- 3 receiver
NOTE: The digital input lines working at 2.8VCMOS have an absolute maximum input voltage
of 3,75V; therefore the level translator IC shall not be powered by the +3.8V supply of the
module. Instead it shall be powered from a +2.8V / +3.0V (dedicated) power supply.
This is because in this way the level translator IC outputs on the module side (i.e. GC864
inputs) will work at +3.8V interface levels, stressing the module inputs at its maximum input
voltage.
This can be acceptable for evaluation purposes, but not on production devices.
NOTE: In order to be able to do in circuit reprogramming of the GC864 firmware, the serial port
on the Telit GC864 shall be available for translation into RS232 and either it's controlling
device shall be placed into tristate, disconnected or as a gateway for the serial data when
module reprogramming occurs.
Only RXD, TXD, GND and the On/off module turn on pad are required to the reprogramming of
the module, the other lines are unused.
All applicator shall include in their design such a way of reprogramming the GC864.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 24 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
An example of level translation circuitry of this kind is:
the RS232 serial port lines are usually connected to a DB9 connector with the following layout:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 25 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
6.2 5V UART level translation
If the OEM application uses a microcontroller with a serial port (UART) that works at a voltage different
from 2.8 - 3V, then a circuitry has to be provided to adapt the different levels of the two sets of signals.
As for the RS232 translation there are a multitude of single chip translators, but since the translation
requires very few components, then also a discrete design can be suited. For example a possible
inexpensive translator circuit for a 5V driver can be:
and for a 5V receiver:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 26 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
NOTE: The UART input line TXD (rx_uart) of the GC864 is NOT internally pulled up with a
resistor, so there may be the need to place an external 47KΩ pull-up resistor, either the DTR
(dtr_uart) and RTS (rts_uart) input lines are not pulled up internally, so an external pull-up
resistor of 47KΩ may be required.
A power source of the internal interface voltage corresponding to the 2.8VCMOS high level is
available at the VAUX pad, whose absolute maximum output current is 100mA.
Pull-up resistors can be connected to the VAUX pad provided that the pulled-up lines are GC864 input
lines connected to open collector outputs in order to avoid latch-up problems on the GC864.
Care must be taken to avoid latch-up on the GC864 and the use of this output line to power electronic
devices shall be considered with care, especially for devices that generate spikes and noise such as
level translators, digital ICs or microcontroller, failure in any of these condition can severely
compromise the GC864 functionality.
NOTE: The input lines working at 2.8VCMOS can be pulled-up with 47KΩ resistors that can be
connected directly to the VAUX line.
NO disturbing devices should be powered with the VAUX line, otherwise the module
functionality may be compromised.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 27 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
7 Audio Section Overview
The Base Band Chip of the GC864 Telit Module provides two different audio blocks; both in transmit
(Uplink) and in receive (Downlink) direction:
“MT lines” should be used for handset function,
“HF lines” is suited for hands -free function (car kit).
These two blocks can be active only one at a time, selectable by AXE hardware line or by AT
command.
The audio characteristics are equivalent in transmit blocks, but are different in the receive ones and
this should be kept in mind when designing.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 28 of 68
50cm
7cm
-45dBV/Pa
-45dBV/Pa
+10dB
3,3mV
0,33mV
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
GC864 Audio Paths
+20dB
23mV rms
365mV rms
Mic_HF-
Mic_HF+
Mic_MT-
Mic_MT+
GC864
Ear_HF-
Ear_HF+
Ear_MT-
Ear_MT+
ended
Single
Balance
Fully Differential
Power Buffers
16
16
-12dBFS
egolite.sk
Differential
Line-Out Drivers
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
EXTERNAL
AMPLIFIER
page 29 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
7.1 Microphone paths characteristic and requirements
TIP: being the microphone circuitry the more noise sensitive , its design and layout must be
done with particular care. Both microphone paths are balanced and the OEM circuitry should
be balanced designed to reduce the common mode noise typically generated on the ground
plane. However also an unbalanced circuitry can be used for particular OEM application needs
TIP: due to the difference in the echo canceller type, the “Mic_MT” audio path is suited for
Handset applications, while the “Mic_HF”audio path is suited for hands-free function (car kit).
The Earphone applications should be made using the “Mic_HF” audio path but DISABLING the
echo canceller by software AT command. If the echo canceller is left active with the Earphone,
then some echo might be introduced by the echo cancel algorithm.
“Mic_MT” 1st differential microphone path
•
•
•
•
•
•
•
•
line coupling
line type
coupling capacitor
differential input resistance
differential input voltage
microphone nominal sensitivity
analog gain suggested
echo canceller type
AC
balanced
≥ 100nF
50kΩ
≤ 1,03Vpp (365mVrms)
-45 dBVrms/Pa
+ 20dB
handset
“Mic_HF” 2nd differential microphone path
•
•
•
•
•
•
line coupling
line type
coupling capacitor
differential input resistance
differential input voltage
microphone nominal sensitivity
AC
balanced
≥ 100nF
50kΩ
≤ 65mVpp (23mVrms)
-45 dBVrms/Pa
•
•
analog gain suggested
echo canceller type
+10dB
car kit hands-free
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 30 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
TIP: definition of the nominal sensitivity of the microphone lines .
The nominal sensitivity of the microphone lines indicates the voltage level on the GC864 pins present
during "normal spoken" conditions.
For a handset , the "normal spoken” conditions take place when the talker mouth is 7cm far from the
microphone ; under these conditions the voice will produce an acoustic pressure of -4,7dBPa @1kHz
on the microphone membrane .
TIP: electrical equivalent signal and operating voice levels .
At "normal spoken" conditions, a microphone having the suggested nominal sensitivity of 45dBVrms/Pa , will produce
the electrical equivalent signal :
MicLevel = ( -45) + (-4.7) = -49.7 dBVrms
that means :
MicVoltage = 10 ( -49.7 / 20 ) = 3.3* 10 -3 Vrms
During a call , this level varies according to the volume of the talker voice; usually the following rough
thumb rule for the dynamic range may be used :
1) the talker is screaming . This is the strongest voice level condition : the signal increases by
+20dB ;
2) the talker is whispering. This is the lowest voice level condition: the voice level decreases by
–50dB .
These changes must be considered for designing the external microphone amplifier .
TIP: example of external microphone amplifier calculation .
Let’s suppose to use the 1stdifferential microphone path .In this case the maximum differential input
voltage to “Mic_MT” lines is 365mVrms(1,03Vpp) corresponding to –8,76dBV.
Now we can calculate the maximum voltage gain of an external microphone amplifier GA :
[(MicLevel + 20dB ) + G A ] = −8,76dBV
[− 49,7 + 20 + G A ] = −8,76
− 40,9 + 20 = −G A
G A = 20,94dB
you can set GA= +20dB to use standard resistor values .
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 31 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
TIP: environment consideration .
For hands-free/car kit microphone, you must take into account the voice attenuation, due to the
distance between the microphone itself and the talker, when designing the external microphone
amplifier.
Not only, you must consider that the microphone will pick up also ambient noise; to overcome this
problem it is preferable to set the gain of the microphone 10dB lower with respect to the calculated
value for a nominal sensitivity. The corresponding reduction in signal level will be compensated by an
increased voice volume of the talker which will speak louder because of the ambient noise.
For a car cabin usually the distance between the microphone itself and the talker is 40/50cm; in these
conditions the attenuation can be considered as a thumb rule around 20dB.
For the earphone we shall distinguish two different types: the earphones having the microphone
sustained close to the mouth and the ones having the microphone on the earpiece cable.
The same considerations for the additional voice attenuation due to the distance from the microphone
and the noise pick up can be made for the earphone having the microphone on the earpiece cable,
while the other kind of earphone shall be threaten as an handset.
TIP: how to compensate the losses in car cabin hands-free condition .
The voice signal , that in the "normal spoken” conditions produces on the microphone membrane an
acoustic pressure of -4,7dBPa at 1kHz , will have a further attenuation of 20dB due the 50cm distance
Therefore a microphone having the suggested nominal sensitivity of -45dBVrms/Pa,will produce a lower
electrical
equivalent signal :
MicLevel = ( -45) + (-4.7)-20 = -69.7
that means :
MicVoltage = 10 ( -49.7 / 20 ) = 0,33* 10 -3
Setting the “microphone gain” at +10dB (3 times), the signal in the nominal conditions on the
“Mic_HF” inputs s of GC864 Telit Module will be :
“Mic_HF” Level = 0,33* 10 -3 * 3=1* 10 -3
Hence in these conditions the signal level on the“Mic_HF” input pads of the GC864 is 10 dB (3 times)
lower than the nominal, as suggested.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 32 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
7.2 General Design Rules
There are several configurations for the audio paths, but the most effective difference is between
balanced and unbalanced microphone configuration.
It is highly recommended to keep the whole microphone path balanced even if this means having 2
wires connecting the microphone instead of one needed (plus ground) in the unbalanced case. The
balanced circuitry is more suited because of its good common mode noise rejection, reducing the 216
Hz burst noise produced during the GSM transmissions.
• Where possible use balanced microphone circuitry
• Keep the microphone traces on the PCB and wires as short as possible.
• If your application requires an unbalanced microphone, then keep the lines on the PCB balanced
and "unbalance" the path close to the microphone wire connector if possible.
• For the microphone biasing voltage use a dedicated voltage regulator and a capacitor multiply
circuit.
• Make sure that the microphone traces in the PCB don't cross or run parallel to noisy traces
(especially the power line)
• If possible put all around to the microphone lines a ground trace connected to the ground plane by
several vias. This is done in order to simulate a shielded trace on the PCB.
• The biasing circuit and eventually the buffer can be designed in the same manner for the internal
and external microphones.
7.3 Other considerations.
If your application is a hands-free/car kit scenario, but you need to put microphone and speaker inside
the same box:
• Try to have the maximum possible distance between them, at least 7cm;
• Because the microphone type is very important, if you use an omni-directional one (and this is the
typical application) please seal it on the rear side (no back cavity) in order not to collect unwanted
signals;
• Try to make divergent the main axes of the two devices.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 33 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
7.4 Microphone Biasing
The electret microphones usually need a biasing voltage to work properly. Refer to your microphone
provider for the characteristics required.
NOTE: The microphones have a hot wire were the positive biasing must be connected. Usually
it is indicated by a + symbol or a red point. If the polarity of the bias is reversed, then the
microphone will not work properly. For this reason be sure to respect the mic. biasing polarity.
7.4.1 Balanced Microphone biasing
The balanced microphone bias voltage should be obtained from a dedicated voltage regulator, in order
to eliminate the noise present on the power lines. This regulator can be the same for all the audio
paths. The microphone should be supplied from a capacitor multiply circuit.
For example a circuit for the balanced microphone biasing can be:
NOTE: In the balanced application the resistors R2 and R3 must have the same value to keep
the circuit balanced.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 34 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
NOTE: The cable to the microphone should not be shielded, instead a twisted pair cable shall
be used.
NOTE: The microphone sensitivity changes with the value of R2 and R3. Usually the
microphones are characterized with 2kΩ biasing resistance, so try to keep the sum of R2 and
R3 around 2kΩ. Refer to your microphone manufacturer for the mic. characteristics.
7.4.2 Unbalanced Microphone biasing
The unbalanced microphone biasing voltage should be obtained from a dedicated voltage regulator, in
order to eliminate the noise present on the power lines. This regulator can be the same for all the
audio paths. The microphone should be supplied from a capacitor multiply circuit.
For example a circuit for the unbalanced microphone biasing can be:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 35 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
NOTE: In the unbalanced application the capacitor C3 shall be > 200nF otherwise the frequency
response will be cut at low band frequencies (down to 300Hz). This capacitor can be placed
close to the MIC- pad (MIC_HF- or MIC_MT- depending on the audio path chosen) or if
possible it should be placed close to the shielded cable connector. If the ground return path is
well designed, then it is possible to eliminate the C3 capacitor, provided the buffer is close to
the mic. input.
NOTE: The cable to the microphone should be shielded.
NOTE: The microphone changes with the value of R2. Usually the microphone sensitivity is
characterized with 2kΩ biasing resistance, so try to keep the value of R2 around 2kΩ. For mic.
characteristics refer to the manufacturer.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 36 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
7.5 Microphone buffering
As seen previously, a microphone shall be connected to the input pins of the GC864 through a buffer
amplifier that boosts the signal level to the required value.
Again the buffered microphone circuitry can be balanced or unbalanced : where possible it is always
preferable a balanced solution. The buffering circuit shall be placed close to the microphone or close
to the microphone wire connector.
7.5.1 Buffered Balanced Mic.
A sample circuit can be:
To
GC864
270pF
270pF
This circuit has a gain of 10 times (+20 dB), and is therefore suited for the “Mic_MT “ input if you have
a microphone with a sensitivity close to the suggested one (-45 dBVrms/Pa). If your microphone has a
different sensitivity or if the buffer is connected to the “Mic_HF “ inputs , then a gain adjustment shall
be done by changing resistors R604 and R606 ( if the required value is not a standard one , you can
change R605 e R607 ) and as a consequence the capacitors C636 and C637 to maintain the
bandwidth 150-4000Hz (at -3dB).
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 37 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
The buffer gain is given by the formula:
Gain =
R604 R606
R605 R607
The C636 and C637 capacitors are placed in order to cut off the gain at higher frequencies than the
transmitted GSM band, the cutoff frequency (-3dB) should be 3500Hz in order to have -1dB at 3kHz.
The cutoff frequency is given by the formula:
freq. =
[Hz]
2π * R604 * C 637 2π * R606 * C 636
TIP: example of calculation .
Let's assume you have a microphone with a sensitivity of -45 dBVrms/Pa and you want to use it in 1st
differential microphone path (“Mic_MT” inputs) in "normal spoken" conditions at acoustic pressure of
-4.7dBPa.
As reported at page 33 , the electrical level output from the microphone will be :
MicLevel = ( -45) + (-4.7) = -49.7 dBVrms
MicVoltage = 10 ( -49.7 / 20 ) = 3.3* 10 -3 Vrms
corresponding to:
When the talker is screaming ,we will have a signal of 330 mVrms on the “Mic_MT “ inputs for a buffer
gain GA :
GA =20 log (AmplifierOutput / MicVoltage) =20 log (330 * 10 -3 )/( 3.3 * 10 -3 ) = 20 log 10=20dB
The corresponding values for the resistors on the buffer could be ( if we keep the input resistance
10kΩ )
R604 = R606 = gain* R603= gain* R605 = 10* 15 = 150 kΩ
The commercial values of 150kΩ & 15kΩ are then chosen.
As a consequence the values of the capacitors C636 and C637 shall be:
C636=C637= 1/ (2π*4000*R606)= 265 *10 -12 F
A commercial value of 270pF gives a cutoff frequency of 3931Hz with an errorless than 1,8% .
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 38 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
7.5.2 Buffered Unbalanced (Single Ended) Microphone .
MIC+
To
GC864
2,7nF
MIC+
6,8nF
The above schematic can be used for a single ended (buffered unbalanced) microphone; the required
biasing circuitry is not included. Note also that the capacitor C3 is not needed .
The gains of the two amplifiers are given by the formulas :
Gain(not inverting buffer ) = 1 +
R 719
R 720
Gain(inverting buffer ) =
R711
R708
Assigning half of overall gain to each amplifier, you will obtain the requested gain because of doubling
the microphone signal path; in fact by the use of two amplifiers (the upper as “inverting” and the lower
as “not inverting”configuration ) we obtain an additional +6dB gain (2 times) .
Remember: the “not inverting “ amplifier section gain shall not be less than 1.
Like for the balanced buffered microphone, the amplifier overall gain can be modify changing the value
of resistor R719/R720 and R711 and as a consequence the capacitors C726 and C727. It is
advisable to change R708 only if you have difficulty to find a commercial value for R711; in this case
change R708 as little as possible.
The -3dB bandwidth is given by the approximated formula (considering C725 >> C726):
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 39 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
freq. =
[Hz]
2π * R719 * C 726 2π * R711* C 727
The buffer bandwidth at -3dB shall be 4KHz.
Note that the biasing of the operational amplifier is given for the inverting amplifier by the series divider
R714-R715. The 100nF capacitor C719 is needed to filter the noise that could be coupled to that
divider. For the not inverting operational amplifier the biasing is given by a different divider R715-R717
with the capacitor C720 and through a series resistor R718 of 470KΩ.
TIP: example of calculation.
Llet's assume you have a microphone with a sensitivity of -45dBVrms/Pa and you want to use it in 2nd
differential microphone path (“Mic_HF” inputs) in "normal spoken" conditions at acoustic pressure
of -4.7dBPa.
As reported at page XX , the electrical level output from the microphone will be :
MicLevel = ( -45) + (-4.7) = -49.7 dBVrms
but we have to consider 20dB loss due to the higher distance from the mouth of the talker ( 50cm ) .
MicLevel = ( -49.7) + (-20) = -69.7 dBVrms
corresponding to
MicVoltage = 10 ( -69.7 / 20 ) = 0,33* 10 -3
In order to have a signal of 1 mVrms at the “Mic_HF” inputs , as suggested at TIP “environment
consideration “,
GA= “Mic_HF /MicVoltage = (1*10 -3)/(0,33*10
the buffer must have a gain
or +10 dB
Keeping in mind that “ balancing the line will double the signal”, to calculate the resistor values assign
half of required gain GA to each amplifier section . And therefore GS =1,5times (or +3,52dB) .
Choosing as 10kΩ as the input resistance , the corresponding values for the resistors on the buffer will
be :
R711 = GS * R708= 1.5*10 =15 kΩ
R719 = (GS -1) * R720 = (1.5 -1)*10 =5 kΩ
The commercial values of 15kΩ and 5.6kΩ be accepted .
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 40 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
As a consequence of the assigned values of the resistors, the nominal values of C726 and C727 are
C726= 1/ (2π*4000*R719)= 7.10 *10 -9 F
C727= 1/ (2π*4000*R711)= 2,65 *10 -9 F
modified in 6,8nF (fc1=4181Hz ) and 2,7nF (fc2=3931Hz) because of commercial values .
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 41 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
OUTPUT LINES (Speaker)
8.1 Short description.
The Telit GC864 provides two audio paths in receive section. Only one of the two paths can be active
at a time, selectable by AXE hardware line or by AT command.
You must keep in mind the different audio characteristics of the receive blocks when designing:
the “Ear_MT” lines EPN1 and EPP1 are the Differential Line-Out Drivers ; they can drive an
external amplifier or directly a 16 Ω earpiece at –12dBFS (*) ;
the “Ear_HF” lines EPPA1_2 and EPPA2 are the Fully Differential Power Buffers ; they can directly
drive a 16Ω speaker in differential (balanced) or single ended (unbalanced) operation mode .
(*) FS : acronym of Full Scale. It is equal to 0dB, the maximum Hardware Analog Receive Gain of
BaseBand Chip.
The “Ear_MT” audio path should be used for handset function, while the “Ear_HF” audio path is suited
for hands-free function (car kit).
Both receiver outputs are B.T.L. type (Bridged Tie Load) and the OEM circuitry shall be designed
bridged to reduce the common mode noise typically generated on the ground plane and to get the
maximum power output from the device; however also a single ended circuitry can be designed for
particular OEM application needs.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 42 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
8.2 Output lines characteristics .
“Ear_MT” Differential Line-out Drivers Path
• line coupling:
• line type:
• output load resistance :
• internal output resistance:
• signal bandwidth:
• max. differential output voltage
• differential output voltage
• SW volume level step
• number of SW volume steps
DC
bridged
≥ 14 Ω
4 Ω (typical)
150 - 4000 Hz @ -3 dB
1310 mVrms (typ, open circuit)
328mVrms /16 Ω @ -12dBFS
- 2 dB
10
“Ear_HF” Power Buffers path
• line coupling:
• line type:
• output load resistance :
• internal output resistance:
• signal bandwidth:
• max. differential output voltage
• max. single ended output voltage
• SW volume level step
• number of SW volume steps
DC
bridged
≥ 14 Ω
4 Ω ( >1,7 Ω )
150 - 4000 Hz @ -3 dB
1310 mVrms (typ, open circuit)
656 mVrms (typ, open circuit)
- 2 dB
10
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 43 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
8.3 General Design rules
There are several configurations for the audio output path, but the various design requirements can be
grouped into three different categories:
•
•
•
handset earphone (low power, typically a handset)
hands-free earphone (low power, typically a earphone)
car kit speakerphone (high power, typically a speaker)
The three groups have different power requirements, usually the first two applications need only few
mW of power, which can be directly drained from the GC864 pads, provided a suited speaker is used.
This direct connect design is the cheaper and simpler solution and will be suited for the most of the
earphone design requirements. There's no need to decouple the output ear lines if a suited earpiece is
connected. For the last group, the speakerphone, a power amplifier is required to raise the output
power up to 5-10W required in a car cabin application.
All the designs shall comply with the following guidelines:
• Where possible use a bridged earphone circuitry, to achieve the maximum power output from the
device.
• Keep the earphone traces on the PCB and wires as short as possible.
• If your application requires a single ended earpiece and you want a direct connection, then leave
one of the two output lines open and use only the other referred to ground. Remember that in this
case the power output is 4 times lower than the bridged circuit and may not be enough to ensure
a good voice volume.
• Make sure that the earphone traces in the PCB don't cross or run parallel to noisy traces
(especially the power line)
• The cable to the speaker shall be a twisted pair with both the lines floating for the bridged output
type, shielded with the shield to ground for the single ended output type.
8.3.1 Noise Filtering
The I/O of the PCB should have a noise filter close to the connector, to filter the high frequency GSM
noise. The filter can be a Π formed by 2 capacitor and a inductance, with the one capacitor of 39pF 0603 case , and the other capacitor of 1nF - 0603; the inductance shall have a value of 39μH .
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 44 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
8.4 Handset earphone design
As seen previously, a 16Ω earpiece can be directly connected to the output pads EAR_MT+ and
EAR_MT- of the GC864.
This solution is often the more cost effective, reducing the components count to a minimum. There are
several limitations to the use of this solution: speaker direct connect imposes the speaker
characteristics to be almost exactly the suggested ones, otherwise the power output may be reduced
(if speaker impedance is bigger than 16Ω) or the GC864 ear port may be damaged (if speaker
impedance is less than 15Ω).
The other limitation of the speaker direct connection is the power output capability of the GC864,
which is limited, and for some particular applications may not be enough.
For these reasons, when the power output of the GC864 is not enough or if the speaker
characteristics are different from the suggested, then it is preferable to use an amplifier to increase the
power and current output capabilities.
Again the output from the GC864 is bridged and both lines should be used, where possible, as inputs
to the power amplifier. This ensures a higher common mode rejection ratio; reducing the GSM current
busts noise on the speaker output.
In this case the “EAR_MT” lines from the GC864 should be AC coupled with a ceramic capacitor of
100nF (or bigger).
It is always desirable to have a mute control on the amplifier, in order to turn it off while the device is
not sending signal to the output, in this manner the amplifier background noise that may be audible
during idle conditions is cut off.
A principle schematic may be:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 45 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
The resulting gain and high pass cut can be obtained with the formula:
Gain =
freq. =
R3
R2
[Hz]
2π * R3 * C 4
And an example of internal Ear amplifier could be:
+12dB
GC864
Some amplifier require a low impedance load at high frequency in order to avoid auto oscillation, this
can be made with a capacitor (100nF) in series with a resistor (15Ω).
When designing your application, remember to provide an adequate bypass capacitor to the amplifier
and place it close to the power input pin of the IC, keeping the traces as short as possible.
8.5 Hands-free earphone (low power) design
The same design considerations made for the handset are valid for the hands-free earphone.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 46 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
8.6 Car Kit speakerphone design
For the car kit speaker phone function the power output requirement is usually at least 4W, therefore
an amplifier is needed to boost the GC864 output.
The design of the amplifier shall comply with the following guidelines:
•
•
•
•
•
•
The input to the amplifier MUST be taken from the “Ear_HF” audio path of the GC864, because of
its echo canceller parameters suited to a car cabin use.
The amplifier shall have a gain of 30-40 times (29-32 dB) to provide the desired output power of 510W with the signal from the GC864 “Ear_HF” audio output lines.
If the amplifier has a fixed gain then it can be adjusted to the desired value by reducing the input
signal with a resistor divider network.
The amplifier shall have a mute control to be used while not in conversation. This results in two
benefits: eliminating the background noise when not in conversation and saving power.
The power to the amplifier should be decoupled as much as possible from the GC864 power
supply, by either keeping separate wires and placing bypass capacitors of adequate value close to
the amplifier power input pads.
The biasing voltage of the amplifier shall be stabilized with a low ESR (e.g. a tantalum) capacitor of
adequate value.
NOTE: The GC864 audio path connected to the car kit hands-free amplifier MUST be “Ear_HF”
one, otherwise the echo cancellation will not be done due to the difference in the echo
canceller characteristics of the GC864 internal audio path from the external audio path.
Example of car kit amplifier schematic.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 47 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
9 External SIM Holder
Aim of this section is to give basic design guide lines to integrate a SIM holder in applications
that uses Telit modules
9.1 SIM DESIGN GUIDES
In all Telit modules there are five pins for SIM card holder connection
These lines are:
SIMVCC
SIMRST
SIMIO
SIMIN
SIMCLK
(SIM Power supply )
( SIM Reset )
( SIM Data )
( SIM Presence/Absence )
( SIM Clock )
SIM connection must take in account of four key issues:
1) Data Integrity: standard rules for digital layout and routing must be followed taking in
consideration that SIMCLK has frequency of 3.57Mhz and SIMIO has 9600Bps baud rate.
2) EMI/EMC: this is a key aspect to consider designing an application based on TELIT module
with internal antenna and/or without a proper-shielded box. Some of these conditions may
occur:
Antenna picks-up digital noise coming from SIM card lines.
Antenna radiated field may interfere digital lines.
Digital lines (in particular clock) may radiate spurious in the surrounding
space.
To overcome all these potential problems, connection lines must be kept as short as
possible and shielded.
SIM-holder position has to be as far as possible from antenna.
RF bypass capacitors (10pF...33pF) closed to SIM card SIM-holder are another good
care.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 48 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
When connection is not short, insertion of 10..100ohm resistor with 10..33pF capacitor
(RC filter) is a good caution to improve EMI from SIMCLK line.
Do not insert resistor on SIMVCC, SIMRST and SIMIO lines, their use is not supported by SIM
electrical interface.
3)
ESD: take standard ESD caution if application based on TELIT module has
SIM holder with contacts reachable from human body.
4)
SIM supply: do not connect capacitance greater than 10nF to SIMVCC line.
Other notes:
SIMIN doesn't require any pull-up resistor. It is built in.
SIM card is detected inserted when this line is short to ground.
Schematic Example:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 49 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
10 General Purpose I/O
The general purpose I/O pads can be configured to act in three different ways:
- input
- output
- alternate function (internally controlled)
Input pads can only be read and report the digital value (high or low) present on the pad at the read
time; output pads can only be written or queried and set the value of the pad output; an alternate
function pad is internally controlled by the GC864 firmware and acts depending on the function
implemented.
Not all GPIO pads support all these three modes:
- GPIO_06/ALARM supports all three modes and can be input, output, alarm output (Alternate
function)
- GPIO_07/BUZZER supports all three modes and can be input, output, buzzer output (Alternate
function)
10.1 Using a GPIO pad as INPUT
The GPIO pads, when used as inputs, can be connected to a digital output of another device and
report its status, provided this device has interface levels compatible with the 2.8V CMOS levels of the
GPIO.
If the digital output of the device to be connected with the GPIO input pad has interface levels different
from the 2.8V CMOS, then it can be connected to GPIO1 or can be buffered with an open collector
transistor, provided a 47KΩ pull-up resistor is connected as seen in the paragraph 6.2
5V UART Level translation.
10.2 Using a GPIO pad as OUTPUT
The GPIO pads, when used as outputs, can drive 2.8V CMOS digital devices or compatible hardware.
When set as outputs, the pads have a push-pull output and therefore the pull-up resistor may be
omitted.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 50 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
10.3 Using the Alarm Output GPIO_06/ALARM
The GPIO_06/ALARM pad, when configured as Alarm Output, is controlled by the GC864 module and
will rise when the alarm starts and fall after the issue of a dedicated AT command.
This output can be used to power up the GC864 controlling microcontroller or application at the alarm
time, giving you the possibility to program a timely system wake-up to achieve some periodic actions
and completely turn off either the application and the GC864 during sleep periods, drammatically
reducing the sleep comsumption to few μA.
In battery powered devices this feature will greatly improve the autonomy of the device.
10.4 Using the Buzzer Output GPIO_07/BUZZER
The GPIO_07/BUZZER pad, when configured as Buzzer Output, is controlled by the GC864 module
and will drive with appropriate square waves a Buzzer driver.
This permits to your application to easily implement Buzzer feature with ringing tones or melody
played at the call incoming, tone playing on SMS incoming or simply playing a tone or melody when
needed by your application.
A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the
GPIO_07/BUZZER.
NOTE: To correctly drive a buzzer a driver must be provided, its characteristics depend on the
Buzzer and for them refer to your buzzer vendor.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 51 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
11 Camera
11.1 Camera characteristics
The GC864 module provides a direct support for digital cameras with the following characteristics:
Type:
Technology:
Max picture size:
Output format:
Sensitivity:
11.1.1
TRANSCHIP TC5747
CMOS COLOR camera
VGA 480x640 pixels landscape
JPEG
4 Lux
Camera interface connectors
The 24-pads ZIF connector provides the interface connection between GC864 and camera.
GC864
Ball
Signal
ZIF 52437-2472
I/O
Function
Pin Signal
C6
CAM_SCL/IIC_SCL
I2C bus serial clock
SCLK
GND
Ground
AGND
VCC_MAIN_CAM
C9
F8
TGPIO_09/CAM_RS
MON1/CAM_CLK
I/O
AVDD28
External 2.8V Regulator enable
controlled by CAM_PWR_ON
pin
Camera Reset
RESET_N
Clock
CLK_IN**
GND
Ground
DGND
n.c
DOUT_0
I/O
n.c
DOUT_1
I/O
n.c
DOUT_2
I/O
n.c
10
DOUT_3
I/O
n.c
11
DOUT_4
I/O
n.c
12
DOUT_5
I/O
n.c
13
DOUT_6
I/O
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 52 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
n.c
14
DOUT_7
I/O
n.c
15
DOUT_8
I/O
n.c
16
VCLKOUT
n.c
17
VALIDH
n.c
18
VALIDV
VCC_MAIN_CAM
19
DVDD28
D7
CAM_SDA/IIC_SDA
20
SDIN
I/O
GND
Ground
21
PS1
K11
TGPIO_08/CAM_ON
Camera power type selector
22
PS2
GND
Ground
23
SHIELD
Flash Enable
24
LED_CTRL
External 2.8V Regulator enable
controlled by CAM_PWR_ON
pin
I/O I2C bus serial data
Filter the AVDD28.
Use a Buffer between module clk out, MON1_CAM and camera clk in, CLK_IN.
n.c = Not-connected.
**
Camera Socket Connector
11.1.2
11.1.3
11.1.4
Camera Socket Connector
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 53 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
11.1.5
EVB for Transchip camera support
In order to interface the Telit GC864 module with a CMOS camera, Telit has developed an evaluation
board (see Annex B). The EVK2 (see Annex A) allow connecting all Telit modules through 2
connectors of 40 pins each.
The I2CBUS CAMERA board is plugged in the 2 connectors of 30 pins each on the module board.
CAMERA
BOARD
MODULE
BOARD
MAIN
BOARD
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 54 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
11.1.6
Example usage script for camera
Camera setting: (shown here are the defaults ones)
>AT#CAMSEL=0
(camera selection: 0-auto, 2-transchip)
OK
>AT#CMODE=0
(camera mode: 0-day, 1-night)
OK
>AT#CAMQUA=0
(camera quality: 0-low, 1-medieum, 2-high)
OK
>AT#CAMRES=0
(camera resolution: 0-VGA, 1-QVGA, 2-QQVGA)
OK
>AT#CAMCOL=0
(camera color: 0-color, 1-grayscale)
OK
>AT#CAMZOOM=0
(camera zoom: 0-x1, 1-x2, 2-x4)
OK
>AT#CAMTXT=0
(camera timestamp: 0-no, 1-time only, 2-data only, 3-time&data)
OK
Taking an reading a photo:
>AT#CAMEN=1
(camera ON)
OK
>AT#TPHOTO
(take photo)
OK
>AT+OBJL?
(see photo dimension)
#OBJL: Snapshot,38900
(where 38900 is the file dimension in bytes of the photo taken)
OK
>AT#RPHOTO
(download the photo)
…data…..
(where …data… Correspond to the photo data in binary)
OK
>AT#TPHOTO
OK
>AT#RPHOTO
Repeating photo capture and download n times
…data…..
OK
>AT#CAMEN=O
(camera OFF)
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 55 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
12 Conformity Assessment Issues
The GC864 module is assessed to be conform to the R&TTE Directive as stand-alone products, so If
the module is installed in conformance with Dai Telecom installation instructions require no further
evaluation under Article 3.2 of the R&TTE Directive and do not require further involvement of a R&TTE
Directive Notified Body for the final product.
In all other cases, or if the manufacturer of the final product is in doubt then the equipment integrating
the radio module must be assessed against Article 3.2 of the R&TTE Directive.
In all cases assessment of the final product must be made against the Essential requirements of the
R&TTE Directive Articles 3.1(a) and (b), safety and EMC respectively, and any relevant Article 3.3
requirements.
The GC864 module is conform with the following European Union Directives:
• R&TTE Directive 1999/5/EC (Radio Equipment & Telecommunications Terminal Equipments)
• Low Voltage Directive 73/23/EEC and product safety
• Directive 89/336/EEC for conformity for EMC
In order to satisfy the essential requisite of the R&TTE 99/5/EC directive, the GC864
module is compliant with the following standards:
• GSM (Radio Spectrum). Standard: EN 301 511 and 3GPP 51.010-1
• EMC (Electromagnetic Compatibility). Standards: EN 301 489-1 and EN 301 489-7
• LVD (Low Voltage Directive) Standards: EN 60 950
In this document and the Hardware User Guide, Software User Guide all the information you may
need for developing a product meeting the R&TTE Directive is included.
The GC864 module is conform with the following US Directives:
• Use of RF Spectrum. Standards: FCC 47 Part 24 (GSM 1900)
• EMC (Electromagnetic Compatibility). Standards: FCC47 Part 15
To meet the FCC's RF exposure rules and regulations:
- The system antenna(s) used for this transmitter must be installed to provide a separation
distance of at least 20 cm from all the persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
- The system antenna(s) used for this module must not exceed 3 dBi for mobile and fixed or mobile
operating configurations.
- Users and installers must be provided with antenna installation instructions and transmitter
operating conditions for satisfying RF exposure compliance.
Manufacturers of mobile, fixed or portable devices incorporating this module are advised to clarify
any regulatory questions and to have their complete product tested and approved for FCC
compliance.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 56 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
13 SAFETY RECOMMANDATIONS
READ CAREFULLY
Be sure the use of this product is allowed in the country and in the environment required. The use of
this product may be dangerous and has to be avoided in the following areas:
Where it can interfere with other electronic devices in environments such as hospitals, airports,
aircrafts, etc
Where there is risk of explosion such as gasoline stations, oil refineries, etc
It is responsibility of the user to enforce the country regulation and the specific environment regulation.
Do not disassemble the product; any mark of tampering will compromise the warranty validity.
We recommend following the instructions of the hardware user guides for a correct wiring of the
product. The product has to be supplied with a stabilized voltage source and the wiring has to be
conforming to the security and fire prevention regulations.
The product has to be handled with care, avoiding any contact with the pins because electrostatic
discharges may damage the product itself. Same cautions have to be taken for the SIM, checking
carefully the instruction for its use. Do not insert or remove the SIM when the product is in power
saving mode.
The system integrator is responsible of the functioning of the final product; therefore, care has to be
taken to the external components of the module, as well as of any project or installation issue,
because the risk of disturbing the GSM network or external devices or having impact on the security.
Should there be any doubt, please refer to the technical documentation and the regulations in force.
Every module has to be equipped with a proper antenna with specific characteristics. The antenna has
to be installed with care in order to avoid any interference with other electronic devices and has to
guarantee a minimum distance from the body (20 cm). In case of this requirement cannot be satisfied,
the system integrator has to assess the final product against the SAR regulation.
The European Community provides some Directives for the electronic equipments introduced on the
market. All the relevant information’s are available on the European Community website:
http://europa.eu.int/comm/enterprise/rtte/dir99-5.htm
The text of the Directive 99/05 regarding telecommunication equipments is available, while the
applicable Directives (Low Voltage and EMC) are available at:
http://europa.eu.int/comm/enterprise/electr_equipment/index_en.htm
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 57 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
14 Document Change Log
Revision
ISSUE#0
Date
12/06/06
Changes
Release First ISSUE# 0
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 58 of 68
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Annex A – EVK2 schematics
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 59 of 68
GND
R113
+3.7V
D104
CHARGE
2:9B
SMB
U34
4.7
5%
0603
11
PL106
STPS340U
6 Vcc
R112
680
10
CHARGER ON
47K
4.7nF
X7R
50V
0603
R105
4.7
BATTERY CHARGER INPUT
5%
1206
C105
5%
1206
9019915102410
R111
0603
CURRENT UNLIMITED
R104
PL103
1984617PT1.5_2-3.5-H
R110
TO-263AB
IRL5602SPBF
Q103
4.7
5%
1206
4.7
5%
1206
ON_OFF*
2:5E;2:9B
R108
WNs
SOT-323
BCR185W
10K
Q105
BC857B
WARNING!!!!
Care must be taken to ensure
that the right polarity in the
power input is respected!
DO NOT Supply power when the
Battery is not connected
47K
R116
0402
5%
5.6K
Q102
LY-M676-Q2S1-26
+3.7V
+3.7V
DL101
R106
SOT-323
1Fs
Q104
47K
47K
BC847BW
2K2
TR1
Q101
noMount=YES
8.2K
5%
0402
47K
ALL RIGHTS RESERVED
REPRODUCTION AND DISCLOSURE
FORBIDDEN
3Fs
SOT-23
5%
0603
5%
0603
M676
YELLOW
R109
680
BCR48PN
WTs
SOT-363
TR2
R118
0402
R107
2.2K
5%
0402
GND
RESET*
2:4E;2:9C
LDO_ON_OFF*
3:6C;3:7B;4:6E;5:2B;5:2D;5:8C
GND
R117
GND
47K
5%
0402
GND
3.8V
IN
R103
0603
PL101
1984617PT1.5_2-3.5-H
PL105
1215061-03F
1-2 : 5-40V IN
2-3 : 3.8V IN
GND
1-2 : Regulator
2-3 : Battery
+3.7V
1215061-03F
PL104
WARNING!!!!
Care must be taken to ensure
that the right polarity in the
power input is respected!
D103
STPS140Z
SOD123
GND
FUSE 1206
PL107
1984617PT1.5_2-3.5-H
BATTERY LI-ION
3,7V(Li-Ion) Nominal
D105
STPS140Z
PL102
MAX 40V
INPUT
LM2596S-ADJ-NOPB
0603
D101
STPS3L60U
G36
SMB
GND
C101
C102
C103
C104
10nF
X7R
50V
0603
10nF
X7R
50V
0603
10nF
X7R
50V
0603
470uF
+VIN
VOUT
ON/OFF
GND
FBACK
GND
SLF12575
TAB
D102
STPS3L60U
G36
SMB
50V
16X16.5 NR
C106
C107
330uF
330uF
6.3V
CONT-E
6.3V
CONT-E
R114
C108
2.0K
10nF
X7R
16V
0402
1%
0603
WARNING!!!!
When using battery care must be
taken to ensure that the right
polarity is respected!
GND
GND
GND
GND
0603
POWER
JACK
GND
TP102
RAPC712X
R102
SO101
GND
GND
max voltage 4,2V (Li-Ion)
suggested capacity: 1000mAh
L101
GND
GND
TP101
TUTTI I DIRITTI RISERVATI
RIPRODUZIONE E DIVULGAZIONE
VIETATE
MIN 5V
R101
1984617PT1.5_2-3.5-H
GND
SOD123
U101
R115
1.0K
1%
0603
RAPC
MODIFY
GND
GND
DATE
DESCRIPTION
PATH /home/users/area
FILE NAME
EVK 2
cs1139a.cir
OT101
OT102
OT103
Mod. 067 rev.1 11/02
FORM
ANNOTATION
PROJECT
Furlan M.
DRAWN
Serdi M.
080705
VERIFIED
Nonis R.
080705
POWER REGULATOR / BATTERY CHARGE
080705
PROJECT
0276
SHEET N.
OF SHEETS
DRAWING CODE
30276SE11139A
A3
1
10
11
+3.7V
PL201
4731955140400
PL202
4731955140400
IIC_SDA_HW
0402
IIC_SDA_HW
5:5D
0402
SSC0_MRST
R204
R203
SSC0_MTSR
0402
R205
IIC_SCL_HW
5:5D
SSC0_CLK
5:11B
SSC0_MTSR
5:11B
SSC0_MRST
5:11B
SSC0_CLK
0402
R202
0402
10
CHARGE
1:8A
VBATT
VBATT
VBATT
VBATT
GND
GND
GND
GND
CHARGE
10
CHARGE
GND
11
GND
12
11
GND
GND
13
12
GND
GND
14
13
GND
14
GND
15
ON_OFF*
15
C109/DCD
C109/DCD
3:3C
C104/RXD
3:3C
C103/TXD
3:3C
C108/DTR
3:3C
16
C104/RXD
C103/TXD
17
18
C108/DTR
19
ON_OFF*
1:9A;5E
16
17
RESET*
1:9B;4E
RESET*
18
2x5
GND
20
19
C107/DSR
C107/DSR
3:3C
C105/RTS
3:3C
C106/CTS
3:3C
C125/RING
3:3C
21
C105/RTS
C106/CTS
22
23
C125/RING
2x5
DATA
24
SUPPLY
IIC_SCL_HW
SSC
R206
GND
IIC
TX_TRACE
3:3C
RX_TRACE
3:3C
TX_TRACE
RX_TRACE
TRACE
2x5
ALL RIGHTS RESERVED
REPRODUCTION AND DISCLOSURE
FORBIDDEN
20
21
STAT_LED
3E
STAT_LED
22
23
25
24
26
25
GND
27
26
GND
27
GND
28
GND
EAR_HF+
EAR_HF+
4:11B
EAR_MT4:9B
EAR_HF4:11B
EAR_MT+
4:9B
AXE
4:11B
MIC_HF4:11B
MIC_MT+
4:9B
MIC_HF+
4:11B
MIC_MT4:9B
30
EAR_MT31
EAR_HF33
AXE
34
MIC_HF35
MIC_MT+
36
MIC_HF+
37
MIC_MT38
GND
GND
29
SO201
30
FMS006Z-2001-0
SIMIO
GND
C7
C3
C6
C2
SIM_CARD
C5
C1
31
SIMIO
SIMCLK
32
SIMCLK
SIMRST
33
SIMRST
SIMVCC
34
SIMVCC
35
SIMIN
36
SIMIN
C201
39
33pF
COG
50V
0402
40
GND
SIM
2x5
EAR_MT+
2x5
AUDIO
32
TP205
29
TP204
28
GND
TP203
GND
GND
TP202
GND
TP206
GND
GND
C202
C203
33pF
COG
50V
0402
33pF
COG
50V
0402
GND
GND
37
C204
33pF
COG
50V
0402
38
GND
39
GND
40
GND
GND
TUTTI I DIRITTI RISERVATI
RIPRODUZIONE E DIVULGAZIONE
VIETATE
GND
GND
TP201
+3.7V
RESET BUTTON
R201
ON_OFF*
1:9A;9B
MODIFY
SW201
M676
YELLOW
RESET*
1:9B;9C
SKHHAL
GND
LY-M676-Q2S1-26
DATE
SW202
YELLOW - STAT LED
SKHHAL
5%
0603
330
ON BUTTON
DESCRIPTION
PATH /home/users/area
FILE NAME
EVK 2
cs1139a.cir
DL201
Mod. 067 rev.1 11/02
GND
STAT_LED
9C
FORM
ANNOTATION
PROJECT
Furlan M.
080705
DRAWN
Serdi M.
080705
VERIFIED
Nonis R.
080705
INTERFACE CONNECTORS
PROJECT
0276
SHEET N.
OF SHEETS
DRAWING CODE
30276SE11139A
A3
7
+3.7V
U302
ON-OFF* BYPASS
GND
26
28
C1+
L20A
MA05A
C305
GND
C1-
47K
10uF
10V
CONT-A
5%
0402
C2+
V-
GND
U304
C2LDO_ON_OFF*
1:11B;6C;4:6E;5:2B;5:2D;5:8C
V+
25
R304
C306
15nF
X7R
25V
0402
27
C316
2.2uF
X5R
6.3V
0603
220nF
X7R
10V
0603
V_OUT
GND
C312
C302
V_IN
11
220nF
X7R
10V
0603
C309
10
C314
LP2982AIM5X-3_0-NOPB
JP302
2.2uF
X5R
6.3V
0603
VCC
220nF
X7R
10V
0603
C310
220nF
X7R
10V
0603
TP302
MAX3237CAI+
GND
SSOP-28
24
T1IN
T1OUT
T2IN
T2OUT
T3IN
T3OUT
T4IN
T4OUT
T5IN
T5OUT
ALL RIGHTS RESERVED
REPRODUCTION AND DISCLOSURE
FORBIDDEN
23
22
19
17
10
12
16
R1OUTB
21
GND
20
18
R1OUT
R1IN
R2OUT
R2IN
R3OUT
R3IN
11
EN*
MBAUD
GND
15
SHDN*
13
14
10
USB
GND
L20A
MA05A
R301
R302
47K
C303
15nF
X7R
25V
0402
47K
R305
R303
47K
47K
R306
28
C1+
10
3L
V+
4L
47K
5L
25
C304
10uF
10V
CONT-A
5%
0402
5%
0402
5%
0402
5%
0402
5%
0402
C14
C2+
6L
V-
7L
8L
GND
U303
C2LDO_ON_OFF*
1:11B;7B;4:6E;5:2B;5:2D;5:8C
27
C315
GND
2L
26
GND
SSOP-28
24
T1IN
T1OUT
T2IN
T2OUT
T3IN
T3OUT
T4IN
T4OUT
T5IN
T5OUT
23
10
22
19
17
RS232
1U
2U
3U
10
4U
12
5U
6U
16
R1OUTB
21
USB/RS232 Switch
20
18
R1OUT
R1IN
R2OUT
R2IN
R3OUT
R3IN
EN*
GND
15
MBAUD
9L
MAX3237CAI+
SHDN*
7U
8U
11
9U
13
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
PROG
ASC0
ASC0
(PROG)
TRACE
ASC1
ON-OFF* BYPASS
220nF
X7R
10V
0603
GND
C311
220nF
X7R
10V
0603
ASC1
(TRACE)
2.2uF
X5R
6.3V
0603
VCC
TX_TRACE
2:3B
RX_TRACE
2:3B
C104/RXD
2:3B
C103/TXD
2:3C
C125/RING
2:3C
C107/DSR
2:3C
C108/DTR
2:3C
C109/DCD
2:3B
C106/CTS
2:3C
C105/RTS
2:3C
C301
SO301
CD81V1SSAAC
1L
C307
220nF
X7R
10V
0603
1215061-10F
HW FLOW CONTROL
RX_PROG_USB
5:5D
RI_USB
5:5E
DSR_USB
5:5E
DTR_USB
5:5E
DCD_USB
5:5E
CTS_USB
5:5E
RTS_USB
5:5E
PL303
1215061-10F
V_OUT
C308
PL301
TX_TRACE_USB
5:11C
RX_TRACE_USB
5:11C
TX_PROG_USB
5:5D
PL302
1215061-10F
V_IN
220nF
X7R
10V
0603
JP303
GND
C313
LP2982AIM5X-3_0-NOPB
2.2uF
X5R
6.3V
0603
U301
JP301
TP301
+3.7V
GND
14
TUTTI I DIRITTI RISERVATI
RIPRODUZIONE E DIVULGAZIONE
VIETATE
JP304
GND
MODIFY
DATE
DESCRIPTION
PATH /home/users/area
FILE NAME
EVK 2
cs1139a.cir
Mod. 067 rev.1 11/02
PROJECT
Furlan M.
FORM
ANNOTATION
UART
080705
DRAWN
Serdi M.
080705
VERIFIED
Nonis R.
080705
PROJECT
0276
SHEET N.
OF SHEETS
A3
DRAWING CODE
30276SE11139A
3
10
11
R411
C412
10pF
COG
50V
0603
0603
noMount=YES
+3.7V
100nF
Y5V
16V
0603
15
5%
0603
5%
0603
GND
EAR_MT+
2:3C
EAR_MT2:3C
MIC_MT+
2:3D
MIC_MT2:3D
C415
100nF
Y5V
16V
0603
5%
0603
noMount=YES
PL402
PL403
PL404
1215061-05F
1215061-05F
1215061-05F
GND
AXE
2:3C
EAR_HF+
2:3C
EAR_HF2:3C
MIC_HF+
2:3D
MIC_HF2:3D
noMount=YES
R402
15
AUDIO Switch
0603
C408
R401
C416
IN+
100nF
Y5V
16V
0603
100nF
Y5V
16V
0603
GND
R410
100nF
Y5V
16V
0603
BYPASS
C404
VC2
0603
C403
VC1 SHUTDOWN
5%
0603
IN-
100K
VDD
R406
1M
LM4862MX-NOPB
JP403
PL401
9019915102410
R407
U401
R408
ALL RIGHTS RESERVED
REPRODUCTION AND DISCLOSURE
FORBIDDEN
noMount=YES
0603
R409
0603
R412
100K
5%
0603
R404
noMount=YES
C414
GND
1uF
X5R
6.3V
0603
GND
JP401
GND
GND
GND
OPTIONAL POWER AMPLIFIER
EARPIECE
L402
C410
BLM21
1 5
PJ25605-T2
C405
C406
C407
22pF
COG
50V
0402
1nF
X7R
16V
0402
10pF
COG
16V
0402
22pF
COG
50V
0402
1nF
X7R
16V
0402
GND
GND
GND
U402
JP402
LP2982AIM5X-3_0-NOPB
V_OUT
V_IN
GND
R405
TUTTI I DIRITTI RISERVATI
RIPRODUZIONE E DIVULGAZIONE
VIETATE
+3.7V
TP401
GND
Q401
GND
2.2K
5%
0402
BC847BW
GND
R403
C411
C402
1Fs
SOT-323
GND
C401
100nF
Y5V
10V
0402
2250
BLM21
TP402
C413
2250
100uF
L401
PJ25605-T2
100nF
Y5V
10V
0402
SO401
CONT-D
10V
TP404
TP403
22K
BYPASS ON-OFF*
C419
GND
5%
0402
C417
C409
2.2uF
X5R
6.3V
0603
10uF
10V
CONT-A
GND
C418
15nF
X7R
25V
0402
L20A
MA05A
2.2uF
X5R
6.3V
0603
GND
LDO_ON_OFF*
1:11B;3:6C;3:7B;5:2B;5:2D;5:8C
GND
MODIFY
DATE
DESCRIPTION
PATH /home/users/area
FILE NAME
EVK 2
cs1139a.cir
Mod. 067 rev.1 11/02
PROJECT
Furlan M.
DRAWN
Serdi M.
080705
VERIFIED
Nonis R.
080705
A3
AUDIO
080705
PROJECT
0276
FORM
ANNOTATION
SHEET N.
OF SHEETS
DRAWING CODE
30276SE11139A
3
C508
C503
27pF
COG
50V
0402
CP12A
VCC
100nF
X5R
10V
0402
GND
74AHC1GU04DCKRG4
3.3V_HUB
R515
U506
LP2982AIM5X-3_3
3.3V_HUB
noMount=YES
GND
+5V_USB
5%
0402
15K
R519
3.3V_HUB
ADBUS0
3V3OUT
ADBUS1
5%
0402
5%
0402
USB HUB
27
5%
0402
1.5K
ADBUS5
RSTOUT
ADBUS7
43
XTIN_FT2232
3D;5A
XTIN
ACBUS1
ACBUS2
JP503
ACBUS3
44
47
XTOUT
SI/WUA
EECS
U503
EESK
FT2232L
BDBUS0
LQFP48
BDBUS1
EEDATA
TEST
BDBUS2
TP532
BDBUS3
GND
BDBUS4
TP534
BDBUS5
BDBUS6
+5V_USB
BDBUS7
4.7K
5%
0402
R502
VCC
CLK
NC_7
DI
NC_6
DO
VSS
BCBUS1
BCBUS2
BCBUS3
SI/WUB
USB0 <-> PROG. + I2C
GND
GND_34
34
GND_25
25
GND_18
18
GND_9
AGND
GND
TEST
BDBUS2
ON/OFF*
L05A
MA05A
2.2uF
X5R
6.3V
0603
BDBUS5
BDBUS6
+5V_USB
BDBUS7
R536
PWREN
22
21
SSC0_CLK
2:4B
SSC0_MTSR
2:4B
SSC0_MRST
2:4B
20
19
17
R506
16
R526
+5V_USB
15
GND
13
12
11
10
RX_TRACE_USB
3:2C
40
39
TX_TRACE_USB
3:2C
38
37
36
35
33
32
GND
R524
GND
BDBUS4
TP528
GND
U507
93LC56B_I-SNG
18K
5%
0402
+5V_USB
4.7K
5%
0402
JP506
19
17
GND
CS
CLK
DI
DO
VCC
NC_7
NC_6
VSS
BCBUS0
+5V_USB
BCBUS1
BCBUS2
BCBUS3
SI/WUB
30
29
28
27
26
13
12
11
GND_34
GND_25
GND
GND
GND_18
R538
15
GND_9
16
PWREN
41
TP516
GND
10
RX_PROG_USB
3:2C
TX_PROG_USB
3:2C
RTS_USB
3:2C
40
39
38
37
CTS_USB
3:2C
DTR_USB
3:2C
DSR_USB
3:2C
DCD_USB
3:2C
RI_USB
3:2C
36
35
33
32
USB1 <-> TRACE + SSC
MODIFY
DATE
30
29
DESCRIPTION
PATH /home/users/area
28
EVK 2
27
FILE NAME
26
cs1139a
Mod. 067 rev.1 11/02
45
TP531
CS
BCBUS0
+5V_USB
NC
C515
23
34
ACBUS1
ACBUS2
48
BDBUS1
XTIN
ACBUS3
BDBUS0
LQFP48
25
47pF
COG
50V
0402
C504
TUTTI I DIRITTI RISERVATI
RIPRODUZIONE E DIVULGAZIONE
VIETATE
43
44
5%
0402
FT2232L
EEDATA
18
ADBUS7
20
RESET
JP504
U501
EESK
AGND
RSTOUT
ACBUS0
93LC56B_I-SNG
U509
45
noMount=YES
18K
EECS
BDBUS3
TP527
TP529
ADBUS6
C510
10uF
10V
CONT-A
GND
R525
ADBUS5
21
100nF
X5R
10V
0402
VIN
OUT
GND
5%
0402
USBDP
22
5%
5%
0402
1.5K
R513
27
R507
5%
0402
5%
0402
27
R508
ADBUS3
ADBUS4
5%
0402
18K
R535
USBDM
IIC_SDA_HW
2:4B
0402
ADBUS1
IIC_SCL_HW
2:4B
23
18K
3V3OUT
24
18K
VCCIOB
31
VCCIOA
VCC_42
14
42
VCC_3
46
AVCC
C507
0402
16V
X7R
47nF
GND
C509
ADBUS0
R501
SI/WUA
TP526
TP533
U505
47
XTOUT
LP2981AIM5X-3_0-NOPB
ADBUS2
LDO_ON_OFF*
1:11B;3:6C;3:7B;4:6E;2B;8C
+5V_USB
GND
GND
XTIN_FT2232
5A;9C
3.0V_USB
100nF
X5R
10V
0402
TP535
TP515
100nF
X5R
10V
0402
C501
C506
+5V_USB
48
+5V_USB
5%
0402
+5V_USB
470
R511
LDO_ON_OFF*
1:11B;3:6C;3:7B;4:6E;2B;2D
24
RESET
ACBUS0
GND
GND
TP530
GND
GND
USBDP
noMount=YES
5%
0402
5%
0402
ADBUS3
ADBUS6
5%
0402
15K
R531
15K
C520
15K
47pF
COG
50V
0402
15K
+5V_USB
USBDM
ADBUS4
5%
0402
R529
R523
18K
R522
5%
0402
R514
R537
R509
27
R528
ADBUS2
GND
GND
18K
GND
GND
16
15
DP2
DM2
46
R521
3.0V_USB
5%
0402
5%
5%
OVRCUR2
14
PWRON2
13
DP1
12
10
100nF
X5R
10V
0402
DM1
GND
11
GND
OVRCUR1
0402
C502
noMount=YES
C519
100nF
X5R
10V
0402
5%
PWRON3
R520
17
18K
BUSPWR
0402
18
GND
0402
OVRCUR3
GND_7
PWRON1
5%
0402
0402
R512
GND
LDO_ON_OFF*
1:11B;3:6C;3:7B;4:6E;2D;8C
19
GND
JP502
100K
DM3
15K
R505
EEDATA/GANGED
15K
S-PQFP-G32
10V
CONT-A
C517
GND
100nF
X5R
10V
0402
+5V_USB
0402
20
31
JP511
21
14
DP3
GND
VCCIOA
EECLK
OCPROT/PWRSW
TEXTUSB2036VFRG4
GND
GND
2.2uF
X5R
6.3V
0603
RESET
R517
22
L19A
MA05A
15nF
X7R
25V
0402
C516
42
VCC_25
EXTMEM
DP0PUR
GND_28
NPINT0
U502
C514
23
VCC_3
10uF
VCC_3
24
BYPASS ON-OFF*
AVCC
NP3
GND
C513
10uF
10V
CONT-A
C521
3.3V_HUB
C518
GND
100nF
X5R
10V
0402
9019915102410
NPINT1
DM0
C512
PL502
+5V_USB
0402
16V
X7R
47nF
DP0
XTAL2
SUSPND
XTAL1/CLK48
27
5%
0402
5%
0402
R503
5%
0402
27
R504
MODE
1.5K
V_IN
V_OUT
VCC_42
25
26
27
28
29
30
32
R510
31
VCCIOB
XTIN_FT2232
3D;9C
0402
5%
USB
connector
U504
GND
TP502
USBE-004
ALL RIGHTS RESERVED
REPRODUCTION AND DISCLOSURE
FORBIDDEN
74AHC1GU04DCKRG4
GND
noMount=YES
GND
11
U504
1.5K
JP501
10
GND
5%
0402
+5V_USB
0402
27pF
COG
50V
0402
R516
SO501
NX1255GB
6.000MHz
GND
3.3V_HUB
X501
C505
470
R527
41
TP505
PROJECT
Furlan M.
080705
DRAWN
Serdi M.
080705
VERIFIED
Nonis R.
080705
USB <-> PROG,TRACE,I2C,SSC
PROJECT
0276
FORM
ANNOTATION
SHEET N.
OF SHEETS
DRAWING CODE
30276SE11139A
A3
GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Annex B - Camera EVB schematics
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 65 of 68
2
4773540103470
10
11
TRIZIUM
GM862
SO109
SO101
SO102
4779723130417
4779723130417
PD[2]
5A
CAM_PWR_ON/AGILENT
6B
SO107
4773540103470
TC5747MF24L
CAM_SYNC/AGILENT
5A
10D
MON1/CAM_CLK
TGPIO_08/CAM_ON
5D
5C
TGPIO_09/CAM_RST
DOUT2
DOUT3
DOUT4
DOUT5
DOUT6
DOUT7
DOUT8
VCLKOUT
VALIDH
VALIDV
DVDD28
SDIN
PS1
PS2
Shield
LED_CTRL
0402
R115
CAM_M_CLK
10D;5A
0402
R107
18
19
19
20
20
21
21
22
TP101
10
11
12
14
15
23
IICSCL/AGILENT
TP102
24
TP103
25
TP104
26
TP105
27
6B
24
25
26
27
PD[3]
TP106
13
22
23
5A
28
28
PD[4]
TP107
29
TP108
30
5A
29
30
TP109
16
TP110
17
GND
TP111
18
19
JP108
20
21
TP112
JP116
CAM_SDA/IIC_SDA
JP117
TGPIO_08/CAM_ON
6B;9B
JP109
22
23
9B
JP110
24
INTERFACE CONNECTORS
noMount=YES
SO104
4773540102470
GND
C110
2.2uF
2.2uF
X5R
X5R
6.3V
0603
6.3V
0603
SO106
4773540103470
GND
C109
VAUX1
VCC_MAIN_CAM
noMount=YES
JP121
0402
R113
GND
0402
R112
GND
GND
U102
LP2982AIM5X–2_8–NOPB
noMount=YES
TransChip TC5747MF24L (24pin)
V_OUT
V_IN
CAM_M_CLK
0402
R114
GND
5A;5C
BYPASS
ON–OFF
R108
C107
C108
33pF
2.2uF
COG
GND
DOUT1
9B
X7R
DOUT0
TGPIO_09/CAM_RST
JP107
17
5A
25V
0402
DGND
16
PD[6]
18
JP114
15
VAUX1
17
9B
15nF
CLK_IN
JP106
CAM_SCL/IIC_SCL
C111
RESET_N
14
5C
16
JP105
13
5D;6B
CAM_SCL/IIC_SCL
0402
AVDD28
R106
CAM_SDA/IIC_SDA
14
JP112
AGND
5B
15
R116
SCLK
12
PD[7]
13
5A
52437–2472
11
5A
12
PD[5]
0402
10
PD[1]
0402
0402
5%
11
5%
5A
10
47K
SO108
47K
4773540103470
R111
PD[0]
SO105
R110
noMount=YES
noMount=YES
FORBIDDEN
ALL RIGHTS RESERVED
REPRODUCTION AND DISCLOSURE
VCC_MAIN_CAM
0402
R105
6B
CAM_DRDY/AGILENT
0402
X5R
6.3V
0603
50V
0402
MON1/CAM_CLK
C104
C105
15nF
10uF
15nF
GND
JP120
noMount=YES
X7R
U101
25V
0402
5%
GND
C112
100nF
Y5V
10V
VCC
GND
25V
0402
10V
CONT–A
GND
0402
CAM_PWR_ON/AGILENT
OT101
6B
0402
1K
GND
R109
X7R
GND
R104
CE
C106
L18A
MA05A
noMount=YES
100K5%
VCC_MAIN_CAM
0402
VIETATE
TUTTI I DIRITTI RISERVATI
RIPRODUZIONE E DIVULGAZIONE
SN74LVC1G08DCKR
R103
9B
U101
SN74LVC1G08DCKR
GND
0402
MODIFY
GND
DATE
DESCRIPTION
PATH /home/users/area
FILE NAME
I2CBUS DUAL CAMERA
cs1170.cir
Mod. 067 rev.1 11/02
PROJECT
DRAWN
–1–
VERIFIED
Furlan M.
Pasqualini N.
FORM
ANNOTATION
A3
060905
060905
SHEET N.
PROJECT
0276
OF SHEETS
DRAWING CODE
30276SE11170
TUTTI I DIRITTI RISERVATI
RIPRODUZIONE E DIVULGAZIONE
VIETATE
ALL RIGHTS RESERVED
REPRODUCTION AND DISCLOSURE
FORBIDDEN
MODIFY
DATE
PATH
/Archivio_PCB/cs1170
FILE NAME
cs1170
DESCRIPTION
cs1170
I2CBUS DUAL CAMERA
FILE GERBER
ANNOTATION
Mod. 048 Rev.0 6/99
Silkscreen side A
Project by
Drawn by: Pasqualini Natascia
Verif. by
FORM
06/09/2005
Project
0276
SHEET N.
A3
OF SHEETS DRAWING CODE
CS1170.SM
TUTTI I DIRITTI RISERVATI
RIPRODUZIONE E DIVULGAZIONE
VIETATE
ALL RIGHTS RESERVED
REPRODUCTION AND DISCLOSURE
FORBIDDEN
MODIFY
DATE
PATH
/Archivio_PCB/cs1170
FILE NAME
cs1170
DESCRIPTION
cs1170
I2CBUS DUAL CAMERA
FILE GERBER
ANNOTATION
Mod. 048 Rev.0 6/99
Silkscreen side B
Project by
Drawn by: Pasqualini Natascia
Verif. by
FORM
06/09/2005
Project
0276
SHEET N.
A3
OF SHEETS DRAWING CODE
CS1170.SM

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.6
Linearized                      : No
XMP Toolkit                     : 3.1-702
Producer                        : Acrobat Distiller 7.0.5 (Windows)
Create Date                     : 2006:06:16 14:48:01+02:00
Creator Tool                    : Acrobat PDFMaker 7.0.5 for Word
Modify Date                     : 2006:06:16 14:54:37+02:00
Metadata Date                   : 2006:06:16 14:54:37+02:00
Format                          : application/pdf
Title                           : GC864 Hardware User Guide
Creator                         : fabriziodr
Document ID                     : uuid:f47bfd5d-f2bc-45a3-a534-237b41081c56
Instance ID                     : uuid:7ad2216f-49e8-4da1-b928-9ec592ae7404
Company                         : Telit Communications S.p.A.
Has XFA                         : No
Page Count                      : 68
Page Layout                     : OneColumn
Author                          : fabriziodr

EXIF Metadata provided by EXIF.tools

Telit Communications S p A GC864 Quad-Band GSM/GPRS module - Type: GC864 User Manual GC864 Hardware User Guide

Telit Communications S.p.A. Quad-Band GSM/GPRS module - Type: GC864 GC864 Hardware User Guide

Users Manual

FCC ID Filing: RI7GC864

Navigation menu

Namespaces

Views

Navigation