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

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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

1 Overview ...........................................................................................................................4

2 Hardware Commands ......................................................................................................5

2.1 Turning ON the GC864 ...........................................................................................................5

2.2 Turning OFF the GC864 ........................................................................................................7

2.2.1 Hardware shutdown..........................................................................................................................7

2.3 Hardware Unconditional Reboot...........................................................................................7

3 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

4 Antenna...........................................................................................................................17

4.1 Antenna Requirements ........................................................................................................17

4.2 GC864 Antenna Connector..................................................................................................17

4.3 Antenna installation Guidelines..........................................................................................18

5 GC864 pins allocation....................................................................................................19

NOTE: RESERVED pins must not be connected..........................................................................21

6 Serial Port .......................................................................................................................22

6.1 RS232 level translation ........................................................................................................24

6.2 5V UART level translation....................................................................................................26

7 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 Balanced Microphone biasing........................................................................................................ 34

7.4.2 Unbalanced Microphone biasing ...................................................................................................35

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7.5 Microphone buffering...........................................................................................................37

7.5.1 Buffered Balanced Mic................................................................................................................... 37

7.5.2 Buffered Unbalanced (Single Ended) Microphone . ...................................................................... 39

8 OUTPUT LINES (Speaker)..............................................................................................42

8.1 Short description..................................................................................................................42

8.2 Output lines characteristics . .............................................................................................43

8.3 General Design rules............................................................................................................44

8.3.1 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

9 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

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

1 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.

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2 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:

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).

ON#

Power ON impulse

GND

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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:

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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:

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.

RESET#

Unconditional Reboot

impulse

GND

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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):

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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: 3.8 V

• Max Supply Voltage: 4.2 V

• Supply voltage range: 3.4 V - 4.2 V

• Max Peak current consumption (impulsive): 1.9 A

• Max Average current consumption during GPRS transmission (rms): 500 mA

• Max Average current consumption during VOICE/CSD transmission (rms): 270 mA

• Average current during Power Saving: ≈ 4 mA

• Average current during idle (Power Saving disabled) ≈ 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.

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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.

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An example of linear regulator with 5V input is:

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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:

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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.

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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.

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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.

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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 300-

400 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.

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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

Frequency range Standard Dual Band GSM/DCS frequency

range or

Standard Tri Band GSM/DCS/PCS

frequency range if used for all three bands

Bandwidth 136 MHz in GSM 850 and 900 & 170 MHz in

DCS & 140 MHz PCS band

Gain Gain < 3dBi

Impedance 50 ohm

Input power > 2 W peak power

VSWR absolute

max

<= 10:1

VSWR

recommended

<= 2:1

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.

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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.

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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

1 VBATT - Main power supply Power

2 VBATT - Main power supply Power

3 VBATT - Main power supply Power

4 VBATT - Main power supply Power

5 GND - Ground Power

6 GND - Ground Power

7 GND - Ground Power

Audio

8 AXE I Handsfree switching 100K

CMOS 2.8V

9 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 O External SIM signal – Reset 1.8/3V

20 SIMIO I/O External SIM signal - Data I/O 1.8/3V

21 SIMIN I External SIM signal - Presence (active low) 47K

1.8/3V

22 SIMCLK O External SIM signal – Clock 1.8/3V

Trace

23 RX_TRACE I RX Data for debug monitor CMOS 2.8V

24 TX_TRACE O TX Data for debug monitor CMOS 2.8V

Prog. / Data + Hw Flow Control

25 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V

26 C104/RXD O Serial data output to DTE CMOS 2.8V

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Pin Signal I/O Function Internal

Pull up

Type

27 C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V

28 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V

29 C108/DTR I Input for Data terminal ready signal (DTR) from DTE CMOS 2.8V

30 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V

31 C105/RTS I Input for Request to send signal (RTS) from DTE CMOS 2.8V

32 C109/DCD O Output for Data carrier detect signal (DCD) to DTE CMOS 2.8V

IIC

35 CAM_SCL /

IIC_SCL

I/O Camera IIC interface / Configurable GPIO CMOS 2.8V

36 CAM_SDA /

IIC_SDA

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 O Status indicator led CMOS 1.8V

46 GND - Ground Ground

49 PWRMON I 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* I 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.

47K

Pull up to VBATT

54 RESET* I Reset input

55 VRTC AO VRTC Backup capacitor 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

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 Reserved to detect ON/OFF. It is physically connected to pin 49

(PWRMON)

CMOS 2.8V

70 TGPIO_01 I/O Telit GPIO1 Configurable GPIO CMOS 2.8V

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

I/O Telit GPIO9 GPIO I/O pin 7 Camera Interface CMOS 2.8V

77 TGPIO_13 I/O Telit GPIO13 Configurable GPIO CMOS 2.8V

78 TGPIO_05 /

RFTXMON

I/O Telit GPIO05 Configurable GPIO / Transmitter ON monitor CMOS 2.8V

RESERVED

17 -

33 -

34 -

41 -

42 -

43 -

47 -

48 -

79 -

80 -

NOTE: RESERVED pins must not be connected

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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 PC-

RS232 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

digital pad when on

-0.3V +3.75V

Input voltage on

analog pads when on

-0.3V +3.0 V

Operating Range - Interface levels (2.8V CMOS)

Level Min Max

Input high level VIH 2.1V 3.3V

Input low level VIL 0V 0.5V

Output high level VOH 2.2V 3.0V

Output low level VOL 0V 0.35V

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The signals of the GC864 serial port are:

RS232 Pin

Number

GC864

Pad

Number

Signal Type Name Usage

3 25 C103/TXD I Serial data input (TXD) from DTE Input receive of the GC864 UART

2 26 C104/RXD O Serial data output to DTE Output transmit line of GC864 UART

6 27 C107/DSR O Output for Data set ready signal (DSR) to DTE Output from the GC864 that indicates the

module is ready

8 28 C106/CTS O Output for Clear to send signal (CTS) to DTE Output from the GC864 that controls the

Hardware flow control

4 29 C108/DTR I Input for Data terminal ready signal (DTR) from

DTE

Input to the GC864 that controls the DTE

READY condition

9 30 C125/RING O Output for Ring indicator signal (RI) to DTE Output from the GC864 that indicates the

incoming call condition

7 31 C105/RTS I Input for Request to send signal (RTS) from DTE Input to the GC864 that controls the

Hardware flow control

1 32 C109/DCD O Output for Data carrier detect signal (DCD) to

DTE

Output from the GC864 that indicates the

carrier presence

5 5,6,7 GND - 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 RXD

TXD DTR

GND DSR

RTS CTS

RI GND

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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.

GC864 Hardware User Guide

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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:

GC864 Hardware User Guide

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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:

GC864 Hardware User Guide

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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.

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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.

GC864 Hardware User Guide

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Ear_MT-

Ear_MT+

+20dB 365mV rms

Mic_MT+

Mic_MT-

7cm

GC864

Differential

Line-Out Drivers

Fully Differential

Power Buffers

EXTERNAL

AMPLIFIER

-12dBFS

-45dBV/Pa

3,3mV

+10dB

-45dBV/Pa

0,33mV

Mic_HF- Ear_HF- Balance

Single

ended

23mV rms

Mic_HF+ Ear_HF+

50cm

GC864 Audio Paths

egolite.sk

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 AC

• line type balanced

• coupling capacitor ≥ 100nF

• differential input resistance 50kΩ

• differential input voltage ≤ 1,03Vpp (365mVrms)

• microphone nominal sensitivity -45 dBVrms/Pa

• analog gain suggested + 20dB

• echo canceller type handset

“Mic_HF” 2nd differential microphone path

• line coupling AC

• line type balanced

• coupling capacitor ≥ 100nF

• differential input resistance 50kΩ

• differential input voltage ≤ 65mVpp (23mVrms)

• microphone nominal sensitivity -45 dBVrms/Pa

• analog gain suggested +10dB

• echo canceller type car kit hands-free

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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 :

that means :

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 :

()

[]

dBVGdBMicLevel A76,820 −

[]

76,8207,49 −=++− A

G−=+− 209,40

dBGA94,20= you can set GA= +20dB to use standard resistor values .

MicLevel = ( -45) + (-4.7) = -49.7 dBVrms

MicVoltage = 10 (

49.7 / 20 ) = 3.3* 10

Vrms

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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 :

that means :

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 :

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.

MicLevel = ( -45) + (-4.7)-20 = -69.7

MicVoltage = 10 (

49.7 / 20 ) = 0,33* 10

“Mic_HF” Level = 0,33* 10

* 3=1* 10

GC864 Hardware User Guide

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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.

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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.

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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:

GC864 Hardware User Guide

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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.

GC864 Hardware User Guide

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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:

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).

GC864

270pF

GC864 Hardware User Guide

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The buffer gain is given by the formula:

607

606

605

604

Gain ==

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:

636*606*2

637*604*2

.CRCR

freq

ππ

== [Hz]

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 :

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% .

MicLevel = ( -45) + (-4.7) = -49.7 dBVrms

MicVoltage = 10 (

49.7 / 20 ) = 3.3* 10

Vrms

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7.5.2 Buffered Unbalanced (Single Ended) Microphone .

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 :

()

720

719

1buffer invertingnot R

Gain +=

()

708

711

buffer inverting R

Gain =

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):

GC864

MIC+

2,7nF

6,8nF

GC864 Hardware User Guide

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727*711*2

726*719*2

.CRCR

freq

ππ

== [Hz]

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 :

but we have to consider 20dB loss due to the higher distance from the mouth of the talker ( 50cm ) .

corresponding to

In order to have a signal of 1 mVrms at the “Mic_HF” inputs , as suggested at TIP “environment

consideration “,

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 .

MicLevel = ( -45) + (-4.7) = -49.7 dBVrms

MicVoltage = 10 (

69.7 / 20 ) = 0,33* 10

MicLevel = ( -49.7) + (-20) = -69.7 dBVrms

GA= “Mic_HF /MicVoltage = (1*10

)/(0,33*10

GC864 Hardware User Guide

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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 .

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8 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.

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8.2 Output lines characteristics .

“Ear_MT” Differential Line-out Drivers Path

• line coupling: DC

• line type: bridged

• output load resistance : ≥ 14 Ω

• internal output resistance: 4 Ω (typical)

• signal bandwidth: 150 - 4000 Hz @ -3 dB

• max. differential output voltage 1310 mVrms (typ, open circuit)

• differential output voltage 328mVrms /16 Ω @ -12dBFS

• SW volume level step - 2 dB

• number of SW volume steps 10

“Ear_HF” Power Buffers path

• line coupling: DC

• line type: bridged

• output load resistance : ≥ 14 Ω

• internal output resistance: 4 Ω ( >1,7 Ω )

• signal bandwidth: 150 - 4000 Hz @ -3 dB

• max. differential output voltage 1310 mVrms (typ, open circuit)

• max. single ended output voltage 656 mVrms (typ, open circuit)

• SW volume level step - 2 dB

• number of SW volume steps 10

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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 .

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:

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

The resulting gain and high pass cut can be obtained with the formula:

Gain =

4*3*2

.CR

freq

= [Hz]

And an example of internal Ear amplifier could be:

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.

+12dB

GC864

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 5-

10W 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.

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 (SIM Power supply )

SIMRST ( SIM Reset )

SIMIO ( SIM Data )

SIMIN ( SIM Presence/Absence )

SIMCLK ( 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.

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:

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.

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.

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:

11.1.1 Camera interface connectors

The 24-pads ZIF connector provides the interface connection between GC864 and camera.

GC864 ZIF 52437-2472

Ball Signal I/O Function Pin Signal I/O

C6 CAM_SCL/IIC_SCL O I2C bus serial clock 1 SCLK I

- GND - Ground 2 AGND I

- VCC_MAIN_CAM O External 2.8V Regulator enable

controlled by CAM_PWR_ON

3 AVDD28* I

C9 TGPIO_09/CAM_RS

O Camera Reset 4 RESET_N I

F8 MON1/CAM_CLK O Clock 5 CLK_IN** I

- GND - Ground 6 DGND I

- n.c - - 7 DOUT_0 I/O

- n.c - - 8 DOUT_1 I/O

- n.c - - 9 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

Type: TRANSCHIP TC5747

Technology: CMOS COLOR camera

Max picture size: VGA 480x640 pixels landscape

Output format: JPEG

Sensitivity: 4 Lux

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 O

- n.c - - 17 VALIDH O

- n.c - - 18 VALIDV O

- VCC_MAIN_CAM O External 2.8V Regulator enable

controlled by CAM_PWR_ON

19 DVDD28 I

D7 CAM_SDA/IIC_SDA I/O

I2C bus serial data 20 SDIN I/O

- GND - Ground 21 PS1 I

K11 TGPIO_08/CAM_ON O Camera power type selector 22 PS2 I

- GND - Ground 23 SHIELD -

- - - Flash Enable 24 LED_CTRL O

* 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

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.

MODULE

BOARD

MAIN

BOARD

CAMERA

BOARD

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)

>AT#CMODE=0 (camera mode: 0-day, 1-night)

>AT#CAMQUA=0 (camera quality: 0-low, 1-medieum, 2-high)

>AT#CAMRES=0 (camera resolution: 0-VGA, 1-QVGA, 2-QQVGA)

>AT#CAMCOL=0 (camera color: 0-color, 1-grayscale)

>AT#CAMZOOM=0 (camera zoom: 0-x1, 1-x2, 2-x4)

>AT#CAMTXT=0 (camera timestamp: 0-no, 1-time only, 2-data only, 3-time&data)

Taking an reading a photo:

>AT#CAMEN=1 (camera ON)

>AT#TPHOTO (take photo)

>AT+OBJL? (see photo dimension)

#OBJL: Snapshot,38900 (where 38900 is the file dimension in bytes of the photo taken)

>AT#RPHOTO (download the photo)

…data….. (where …data… Correspond to the photo data in binary)

>AT#TPHOTO

>AT#RPHOTO Repeating photo capture and download n times

…data…..

>AT#CAMEN=O (camera OFF)

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.

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

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

14 Document Change Log

ISSUE#0 12/06/06 Release First ISSUE# 0

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

Annex A – EVK2 schematics

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Mod. 067 rev.1 11/02 ANNOTATION

FILE NAME

42 9810713 1165

1215061-03F

PL104

GND

1206

4.7

R113

GND

1206

4.7

R110

0603

680

R108

TR1

TR2

47K

2K2

WTs

BCR48PN

SOT-363

Q104

GND

1984617PT1.5_2-3.5-H

PL101

OT103

G36

STPS3L60U

SMB

D102

ON_OFF*

2:5E;2:9B

RESET*

2:4E;2:9C

GND

50V

0603

10nF

X7R

C103

STPS140Z

SOD123

D103

GND

16V

0402

10nF

X7R

C108

0402

8.2K

R106

GND

1984617PT1.5_2-3.5-H

PL103

GND

6.3V

CONT-E

330uF

C106

GND

0402

2.2K

R107

GND 50V

16X16.5 NR

470uF

C104

0603

1.0K

R115

CHARGE

2:9B

0603

5.6K

R109

0402

47K

R117

GND

1215061-03F

PL105

6.3V

CONT-E

330uF

C107

TP101

0603

680

R105

RAPC712X

RAPC

SO101

1206

4.7

R111

STPS140Z

SOD123

D105

0603

R101

+3.7V

IRL5602SPBF

TO-263AB

Q103

50V

0603

10nF

X7R

C102

0603

R104

GND

LDO_ON_OFF*

3:6C;3:7B;4:6E;5:2B;5:2D;5:8C

STPS340U

SMB

U34

D104

1206

4.7

R112

0603

R103

TP102

+3.7V

3Fs

BC857B

SOT-23

Q102

OT102

0603

2.0K

R114

1984617PT1.5_2-3.5-H

PL107

GND

+3.7V

0603

R102

GND

0402

47K

R116

OT101

50V

0603

10nF

X7R

C101

50V

0603

4.7nF

X7R

C105

0402

noMount=YES

R118

GND

+3.7V

47K

10K

WNs

BCR185W

SOT-323

Q105

LY-M676-Q2S1-26

M676

YELLOW

DL101

1984617PT1.5_2-3.5-H

PL102

SLF12575

L101

1Fs

BC847BW

SOT-323

Q101

LM2596S-ADJ-NOPB

U101

1+VIN

FBACK

VOUT

5ON/OFF

TAB

GND

G36

STPS3L60U

SMB

D101

GND

9019915102410

PL106

EVK 2

0276

080705

1 30276SE11139A

cs1139a.cir

Furlan M.

POWER REGULATOR / BATTERY CHARGE

BATTERY CHARGER INPUT

6 Vcc

3,7V(Li-Ion) Nominal

BATTERY LI-ION

max voltage 4,2V (Li-Ion)

polarity is respected!

! WARNING!!!!

When using battery care must be

taken to ensure that the right

CURRENT UNLIMITED

power input is respected!

! WARNING!!!!

Care must be taken to ensure

that the right polarity in the

DO NOT Supply power when the

Battery is not connected

suggested capacity: 1000mAh

power input is respected!

Care must be taken to ensure

that the right polarity in the

MIN 5V

MAX 40V

INPUT -

WARNING!!!!

080705

POWER

JACK

3.8V

1-2 : 5-40V IN

2-3 : 3.8V IN

Nonis R.

Serdi M.

FUSE 1206

080705

1-2 : Regulator

2-3 : Battery

CHARGER ON

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Mod. 067 rev.1 11/02 ANNOTATION

FILE NAME

42 9810713 1165

MIC_HF-

4:11B

50V

0402

33pF

COG

C203

+3.7V

GND

4731955140400

PL202

0402

R205

C106/CTS

3:3C

GND

IIC_SDA_HW

5:5D

C104/RXD

3:3C

C109/DCD

3:3C

SSC0_MRST

5:11B

0402

R203

C103/TXD

3:3C

TX_TRACE

3:3C

GND

ON_OFF*

1:9A;5E

SSC0_MTSR

5:11B

GND

MIC_HF+

4:11B

0402

R206

RX_TRACE

3:3C

GND

C125/RING

3:3C

TP201

TP206

C107/DSR

3:3C

0603

330

R201

TP204

SIM_CARD

FMS006Z-2001-0

SO201

6C7

5C6

4C5

EAR_HF+

4:11B

TP205

GND

4731955140400

PL201

GND

RESET*

1:9B;4E

+3.7V

EAR_MT-

4:9B

ON_OFF*

1:9A;9B

0402

R204

GND

50V

0402

33pF

COG

C202

EAR_HF-

4:11B

IIC_SCL_HW

5:5D

STAT_LED

AXE

4:11B

0402

R202

RESET*

1:9B;9C

SSC0_CLK

5:11B

50V

0402

33pF

COG

C201

SKHHAL

SW201

LY-M676-Q2S1-26

M676

YELLOW

DL201

TP203

MIC_MT+

4:9B

C105/RTS

3:3C

GND

TP202

SKHHAL

SW202

GND

MIC_MT-

4:9B

50V

0402

33pF

COG

C204

EAR_MT+

4:9B

CHARGE

1:8A

C108/DTR

3:3C

50276

EVK 2

080705

Furlan M.

30276SE11139A

cs1139a.cir

INTERFACE CONNECTORS

SIMIO

SIMIN

SIMCLK

SIMVCC

SIMRST

YELLOW - STAT LED

RESET BUTTON

080705

Nonis R.

Serdi M.

VBATT

GND

SIMRST

GND

SIMCLK

GND

SIMIN

CHARGE

SIMVCC

STAT_LED

SUPPLY

ON_OFF*

VBATT

2 x 5

GND

VBATT

SIM

GND

CHARGE

GND

RESET*

2 x 5

SIMIO

GND

2 x 5

GND

VBATT

C106/CTS

DATA

GND

MIC_HF-

EAR_HF+

GND

C107/DSR

GND

C108/DTR

GND

AXE

GND

C103/TXD

MIC_MT+

C105/RTS

TRACE

GND

MIC_HF+

EAR_MT-

EAR_MT+

GND

C104/RXD

RX_TRACE

GND

2 x 5

C109/DCD

TX_TRACE

AUDIO

EAR_HF-

C125/RING

2 x 5

MIC_MT-

080705

ON BUTTON

IIC_SDA_HW

IIC_SCL_HW

SSC0_CLK

SSC0_MTSR

SSC0_MRST

IIC

SSC

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Mod. 067 rev.1 11/02 ANNOTATION

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1215061-10F

PL302

0402

47K

R301

25V

0402

15nF

X7R

C303

RTS_USB

5:5E

RI_USB

5:5E

+3.7V

GND

10V

0603

220nF

X7R

C312

6.3V

0603

2.2uF

X5R

C302

10V

0603

220nF

X7R

C316

10V

0603

220nF

X7R

C308

0402

47K

R306

10V

CONT-A

10uF

C304

GND

RX_PROG_USB

5:5D

C125/RING

2:3C

CTS_USB

5:5E C106/CTS

2:3C

LDO_ON_OFF*

1:11B;6C;4:6E;5:2B;5:2D;5:8C

TP301

DTR_USB

5:5E

0402

47K

R304

TX_TRACE_USB

5:11C

GND

+3.7V

MAX3237CAI+

SSOP-28

U303

24 T1IN

23 T2IN

22 T3IN 7

T3OUT

T2OUT

T1OUT

V-

R3IN

17 T5IN

19 T4IN

VCC

SHDN*

25 C1-

GND

28 C1+

20 R2OUT

T4OUT

21 R1OUT

R2IN

1C2+

T5OUT

3C2-

EN*

R1IN

15 MBAUD

V+

16 R1OUTB

18 R3OUT

1215061-10F

PL303

CD81V1SSAAC

SO301

LDO_ON_OFF*

1:11B;7B;4:6E;5:2B;5:2D;5:8C

JP304

GND

10V

0603

220nF

X7R

C311

10V

0603

220nF

X7R

C315

GND

TX_PROG_USB

5:5D

10V

0603

220nF

X7R

C309

0402

47K

R303

C103/TXD

2:3C

C107/DSR

2:3C

10V

0603

220nF

X7R

C310

DCD_USB

5:5E

GND

C104/RXD

2:3B

1215061-10F

PL301

6.3V

0603

2.2uF

X5R

C313

RX_TRACE_USB

5:11C

10V

CONT-A

10uF

C306

GND

C108/DTR

2:3C

L20A

LP2982AIM5X-3_0-NOPB

MA05A

U301

1V_IN

3ON-OFF* 4

BYPASS

V_OUT

2GND

0402

47K

R305

10V

0603

220nF

X7R

C307

JP303

6.3V

0603

2.2uF

X5R

C314

MAX3237CAI+

SSOP-28

U304

24 T1IN

23 T2IN

22 T3IN 7

T3OUT

T2OUT

T1OUT

V-

R3IN

17 T5IN

19 T4IN

VCC

SHDN*

25 C1-

GND

28 C1+

20 R2OUT

T4OUT

21 R1OUT

R2IN

1C2+

T5OUT

3C2-

EN*

R1IN

15 MBAUD

V+

16 R1OUTB

18 R3OUT

JP301 GND

TP302

DSR_USB

5:5E

0402

47K

R302

GND

25V

0402

15nF

X7R

C305

GND

RX_TRACE

2:3B

C109/DCD

2:3B

JP302

TX_TRACE

2:3B

GND

C105/RTS

2:3C

6.3V

0603

2.2uF

X5R

C301

L20A

LP2982AIM5X-3_0-NOPB

MA05A

U302

1V_IN

3ON-OFF* 4

BYPASS

V_OUT

2GND

30276SE11139A

080705

Serdi M.

UART

0276

cs1139a.cir

Furlan M.

080705

EVK 2

RTS

DCD

CTS

TXD

PROG

RXD

ASC1

DSR

ASC0

DTR

GND

TRACE

USB/RS232 Switch

HW FLOW CONTROL

ASC0

(PROG)

ASC1

(TRACE)

USB RS232

Nonis R. 080705

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Mod. 067 rev.1 11/02 ANNOTATION

FILE NAME

42 9810713 1165

GND

TP402

MIC_MT-

2:3D

LM4862MX-NOPB

U401

6VDD

BYPASS

IN+

8VC2

SHUTDOWN

7GND

IN-

5VC1

BLM21

2250

L401

EAR_MT-

2:3C

GND

25V

0402

15nF

X7R

C418

0603

R411

noMount=YES

0603

100K

R404

GND GND

10V

0402

100nF

Y5V

C411

0603

R408

noMount=YES

0603

R402

GND

0402

22K

R405

JP401

6.3V

0603

1uF

X5R

C414

GND

EAR_HF-

2:3C

AXE

2:3C

10V

CONT-A

10uF

C417

6.3V

0603

2.2uF

X5R

C409

MIC_HF-

2:3D

TP401

16V

0603

100nF

Y5V

C408

MIC_MT+

2:3D

GND

10V

CONT-D

100uF

C413

0603

R407

0402

2.2K

R403

0603

R410

noMount=YES

GND

16V

0603

100nF

Y5V

C404

GND

0603

R412

noMount=YES

GND

TP404

10V

0402

100nF

Y5V

C410

EAR_MT+

2:3C

TP403

JP402

0603

R401

16V

0402

10pF

COG

C405

+3.7V

50V

0402

22pF

COG

C406

MIC_HF+

2:3D

16V

0603

100nF

Y5V

C403

BLM21

2250

L402

1215061-05F

PL404

0603

100K

R406

GND

EAR_HF+

2:3C

GND

6.3V

0603

2.2uF

X5R

C419

L20A

LP2982AIM5X-3_0-NOPB

MA05A

U402

V_IN

ON-OFF*

4BYPASS

5V_OUT

GND

LDO_ON_OFF*

1:11B;3:6C;3:7B;5:2B;5:2D;5:8C

PJ25605-T2

SO401

+3.7V

1215061-05F

PL402

1Fs

BC847BW

SOT-323

Q401

50V

0402

22pF

COG

C401

16V

0603

100nF

Y5V

C416

1215061-05F

PL403

16V

0402

1nF

X7R

C402

16V

0402

1nF

X7R

C407

50V

0603

10pF

COG

C412

9019915102410

PL401

0603

R409

noMount=YES

JP403

GND

16V

0603

100nF

Y5V

C415

Serdi M.

AUDIO

080705

0276

Furlan M.

5 30276SE11139A

EVK 2

cs1139a.cir

080705

EARPIECE

OPTIONAL POWER AMPLIFIER

AUDIO Switch

Nonis R. 080705

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Mod. 067 rev.1 11/02 ANNOTATION

FILE NAME

42 9810713 1165

GND

50V

0402

27pF

COG

C505

0402

1.5K

R531

TP533

+5V_USB

0402

1.5K

R513

0402

15K

R520

10V

0402

100nF

X5R

C506

0402

100K

R505

GND

10V

CONT-A

10uF

C510

TP526

GND

3.0V_USB

GND

0402

R503

+5V_USB

50V

0402

47pF

COG

C520

0402

470

R511

TX_TRACE_USB

3:2C

RTS_USB

3:2C

0402

R528

+5V_USB

TX_PROG_USB

3:2C

10V

0402

100nF

X5R

C509

GND

0402

18K

R535

noMount=YES

10V

0402

100nF

X5R

C502

SSC0_MTSR

2:4B

0402

15K

R509

XTIN_FT2232

3D;5A

25V

0402

15nF

X7R

C514

0402

1.5K

R516

TP515

GND

TP530

GND

93LC56B_I-SNG

U507

VCC

3DI

4DO

NC_6

2CLK

VSS

1CS

NC_7

16V

0402

47nF

X7R

C521

93LC56B_I-SNG

U501

VCC

3DI

4DO

NC_6

2CLK

VSS

1CS

NC_7

TP529

GND

0402

18K

R537

noMount=YES

10V

0402

100nF

X5R

C512

RI_USB

3:2C

0402

R507

LDO_ON_OFF*

1:11B;3:6C;3:7B;4:6E;2B;8C

GND

JP504

0402

18K

R506

10V

CONT-A

10uF

C513

LDO_ON_OFF*

1:11B;3:6C;3:7B;4:6E;2D;8C

GND

USBE-004

SO501

10V

0402

100nF

X5R

C501

GND

0402

15K

R519

TEXTUSB2036VFRG4

S-PQFP-G32

U502

1DP0

2DM0

3VCC_3

4RESET

5EECLK

6EEDATA/GANGED

7GND_7

8BUSPWR

9PWRON1

10 OVRCUR1

11 DM1

12 DP1

13 PWRON2

14 OVRCUR2

15 DM2

16 DP2

PWRON3

OVRCUR3

DM3

DP3

OCPROT/PWRSW

NPINT0

NPINT1

NP3

VCC_25

EXTMEM

DP0PUR

GND_28

XTAL2

XTAL1/CLK48

MODE

SUSPND

3.3V_HUB

NX1255GB

CP12A

6.000MHz

X501

50V

0402

27pF

COG

C508

+5V_USB

TP516

GND

6.3V

0603

2.2uF

X5R

C516

16V

0402

47nF

X7R

C507

JP506

+5V_USB

GND

0402

4.7K

R525

3.3V_HUB

3.0V_USB

0402

R529

GND

+5V_USB

GND

TP532

0402

15K

R522

0402

R517

DTR_USB

3:2C

10V

0402

100nF

X5R

C519

0402

1.5K

R510

TP535

TP528

GND

0402

18K

R538

JP511

GND

0402

470

R527

IIC_SDA_HW

2:4B

GND

+5V_USB

JP502

6.3V

0603

2.2uF

X5R

C515

GND

0402

18K

R524

TP502

RX_PROG_USB

3:2C

10V

0402

100nF

X5R

C503

74AHC1GU04DCKRG4

U504

VCC

GND

3.3V_HUB

0402

15K

R523

GND

TP527

GND

IIC_SCL_HW

2:4B

+5V_USB

FT2232L

LQFP48

U509

63V3OUT

8USBDM

7USBDP

5RSTOUT

4RESET

43 XTIN

44 XTOUT

48 EECS

1EESK

2EEDATA

47 TEST

45 AGND

9GND_9

18 GND_18

25 GND_25

34 GND_34

PWREN

SI/WUB

BCBUS3

BCBUS2

BCBUS1

BCBUS0

BDBUS7

BDBUS6

BDBUS5

BDBUS4

BDBUS3

BDBUS2

BDBUS1

BDBUS0

SI/WUA

ACBUS3

ACBUS2

ACBUS1

ACBUS0

ADBUS7

ADBUS6

ADBUS5

ADBUS4

ADBUS3

ADBUS2

ADBUS1

ADBUS0

VCCIOB

VCCIOA

VCC_42

VCC_3

AVCC

TP531

0402

18K

R526

+5V_USB

DSR_USB

3:2C

0402

18K

R501

TP505

GND

DCD_USB

3:2C

+5V_USB

0402

R515

noMount=YES

GND

TP534

XTIN_FT2232

3D;9C

GND

XTIN_FT2232

5A;9C

0402

18K

R536

3.3V_HUB

CTS_USB

3:2C

JP501

L05A

LP2981AIM5X-3_0-NOPB

MA05A

U505

VIN

ON/OFF*

4NC

5OUT

GND

JP503

GND

LDO_ON_OFF*

1:11B;3:6C;3:7B;4:6E;2B;2D

0402

4.7K

R502

0402

noMount=YES

R512

GND

FT2232L

LQFP48

U503

63V3OUT

8USBDM

7USBDP

5RSTOUT

4RESET

43 XTIN

44 XTOUT

48 EECS

1EESK

2EEDATA

47 TEST

45 AGND

9GND_9

18 GND_18

25 GND_25

34 GND_34

PWREN

SI/WUB

BCBUS3

BCBUS2

BCBUS1

BCBUS0

BDBUS7

BDBUS6

BDBUS5

BDBUS4

BDBUS3

BDBUS2

BDBUS1

BDBUS0

SI/WUA

ACBUS3

ACBUS2

ACBUS1

ACBUS0

ADBUS7

ADBUS6

ADBUS5

ADBUS4

ADBUS3

ADBUS2

ADBUS1

ADBUS0

VCCIOB

VCCIOA

VCC_42

VCC_3

AVCC

9019915102410

noMount=YES

PL502

50V

0402

47pF

COG

C504

0402

15K

R514

0402

15K

R521

GND

L19A

LP2982AIM5X-3_3

MA05A

U506

V_IN

ON-OFF*

4BYPASS

5V_OUT

GND

10V

CONT-A

10uF

C518

GND

+5V_USB

GND

RX_TRACE_USB

3:2C

+5V_USB

GND

0402

R508

+5V_USB

GND

SSC0_CLK

2:4B

+5V_USB

SSC0_MRST

2:4B

0402

R504

74AHC1GU04DCKRG4

U504

10V

0402

100nF

X5R

C517

3.3V_HUB

USB0 <-> PROG. + I2C

USB

connector

USB1 <-> TRACE + SSC

USB <-> PROG,TRACE,I2C,SSC

USB HUB

cs1139a EVK 2

0276 30276SE11139A

Furlan M.

Serdi M.

Nonis R.

080705

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

Annex B - Camera EVB schematics

0402

47K

noMount=YES

R111

L18A

LP2982AIM5X–2_8–NOPB

MA05A

U102

V_IN

ON–OFF

4BYPASS

5V_OUT

GND

IICSCL/AGILENT

CAM_SCL/IIC_SCL

CAM_M_CLK

10D;5A

CAM_M_CLK

5A;5C

CAM_SDA/IIC_SDA

5D;6B

TP101

TP106

GND

VAUX1

TP105

GND

0402

R104

GND

TP108

VAUX1

TP110

0402

noMount=YES

R113

GND

JP116

25V

0402

15nF

X7R

noMount=YES

C106

JP120

JP109

10V

CONT–A

10uF

C104

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Mod. 067 rev.1 11/02 ANNOTATION

FILE NAME

42 98 10

71 3 1165

0402

47K

noMount=YES

R110

VCC_MAIN_CAM

6.3V

0603

2.2uF

X5R

C109

CAM_DRDY/AGILENT

PD[5]

4773540103470

SO107

PD[1]

JP106

JP107

GND

TP109

0402

R115

0402

R112

PD[0]

PD[2]

0402

R106

10V

0402

100nF

Y5V

C112

CAM_PWR_ON/AGILENT

VCC_MAIN_CAM

SN74LVC1G08DCKR

U101

VCC

GND

TGPIO_08/CAM_ON

PD[4]

JP114

0402

R105

CAM_SYNC/AGILENT

MON1/CAM_CLK

10D

PD[3]

PD[6]

VCC_MAIN_CAM

CAM_SDA/IIC_SDA

6B;9B

4773540103470

SO109

TP102

25V

0402

15nF

X7R

C105

25V

0402

15nF

X7R

noMount=YES

C111

TGPIO_08/CAM_ON

0402

R109

noMount=YES

52437–2472

SO105

CAM_SCL/IIC_SCL

TP111

4773540103470

SO106

TP107

TGPIO_09/CAM_RST

OT101

JP105

JP117

4779723130417

SO102

0402

R114

SN74LVC1G08DCKR

U101

0402

R116

0402

R108

4779723130417

SO101

TP104

6.3V

0603

2.2uF

X5R

C110

50V

0402

33pF

COG

C107

GND

PD[7]

CAM_PWR_ON/AGILENT

6.3V

0603

2.2uF

X5R

C108

GND

JP108

TGPIO_09/CAM_RST

0402

R107

0402

100K5%

R103

GND

JP112

TP112

TP103

JP121

4773540102470

noMount=YES

SO104

JP110

GND

4773540103470

SO108

MON1/CAM_CLK

10276

Furlan M. 060905

1 30276SE11170

Pasqualini N.

cs1170.cir I2CBUS DUAL CAMERA

060905

SCLK

RESET_N

DVDD28

Shield

SDIN

PS1

VALIDH

AVDD28

VCLKOUT

LED_CTRL

TransChip TC5747MF24L (24pin)

VALIDV

PS2

AGND

DGND

CLK_IN

INTERFACE CONNECTORS

TC5747MF24L

DOUT1

DOUT3

DOUT2

DOUT0

DOUT6

DOUT4

DOUT5

DOUT7

DOUT8

GM862

TRIZIUM

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I2CBUS DUAL CAMERA

cs1170

Drawn by: Pasqualini Natascia

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CS1170.SM

06/09/2005

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FORM

I2CBUS DUAL CAMERA

cs1170

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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

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