Telit Wireless Solutions GE866-QUAD Hardware User's Manual

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GE866-QUAD Hardware User Guide

1VV0301051 Rev. 2 – 2014-04-07

GE866-DUAL Hardware User Guide

1VV0301051 Rev. 2 – 2014-04-077

APPLICABILITY TABLE

PRODUCT

GE866-QUAD

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SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Notice

While reasonable efforts have been made to assure the accuracy of this document, Telit assumes no liability resulting from any inaccuracies or omissions in this document, or from use of the information obtained herein. The information in this document has been carefully checked and is believed to be entirely reliable. However, no responsibility is assumed for inaccuracies or omissions. Telit reserves the right to make changes to any products described herein and reserves the right to revise this document and to make changes from time to time in content hereof with no obligation to notify any person of revisions or changes. Telit does not assume any liability arising out of the application or use of any product, software, or circuit described herein; neither does it convey license under its patent rights or the rights of others.

It is possible that this publication may contain references to, or information about Telit products (machines and programs), programming, or services that are not announced in your country. Such references or information must not be construed to mean that Telit intends to announce such Telit products, programming, or services in your country.

Copyrights

This instruction manual and the Telit products described in this instruction manual may be, include or describe copyrighted Telit material, such as computer programs stored in semiconductor memories or other media. Laws in the Italy and other countries preserve for Telit and its licensors certain exclusive rights for copyrighted material, including the exclusive right to copy, reproduce in any form, distribute and make derivative works of the copyrighted material. Accordingly, any copyrighted material of Telit and its licensors contained herein or in the Telit products described in this instruction manual may not be copied, reproduced, distributed, merged or modified in any manner without the express written permission of Telit. Furthermore, the purchase of Telit products shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent applications of Telit, as arises by operation of law in the sale of a product.

Computer Software Copyrights

The Telit and 3rd Party supplied Software (SW) products described in this instruction manual may include copyrighted Telit and other 3rd Party supplied computer programs stored in semiconductor memories or other media. Laws in the Italy and other countries preserve for Telit and other 3rd Party supplied SW certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or reproduce in any form the copyrighted computer program. Accordingly, any copyrighted Telit or other 3rd Party supplied SW computer programs contained in the Telit products described in this instruction manual may not be copied (reverse engineered) or reproduced in any manner without the express written permission of Telit or the 3rd Party SW supplier. Furthermore, the purchase of Telit products shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent applications of Telit or other 3rd Party supplied SW, except for the normal non-exclusive, royalty free license to use that arises by operation of law in the sale of a product.

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Usage and Disclosure Restrictions License Agreements

The software described in this document is the property of Telit and its licensors. It is furnished by express license agreement only and may be used only in accordance with the terms of such an agreement.

Copyrighted Materials

Software and documentation are copyrighted materials. Making unauthorized copies is prohibited by law. No part of the software or documentation may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, without prior written permission of Telit

High Risk Materials

Components, units, or third-party products used in the product described herein are NOT fault-tolerant and are NOT designed, manufactured, or intended for use as on-line control equipment in the following hazardous environments requiring fail-safe controls: the operation of Nuclear Facilities, Aircraft Navigation or Aircraft Communication Systems, Air Traffic Control, Life Support, or Weapons Systems (High Risk Activities"). Telit and its supplier(s) specifically disclaim any expressed or implied warranty of fitness for such High Risk Activities.

Trademarks

TELIT and the Stylized T Logo are registered in Trademark Office. All other product or service names are the property of their respective owners.

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Contents

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1. Introduction ................................................. 8

1.1. Scope ..................................................... 8

1.2. Audience .................................................. 8

1.3. Contact Information, Support .............................. 8

1.4. Document Organization ..................................... 9

1.5. Text Conventions ......................................... 10

1.6. Related Documents ........................................ 10

2. Overview .................................................... 11

3. GE866-QUAD Mechanical Dimensions ............................ 12

4. GE866-QUAD module connections ............................... 13

4.1. PIN-OUT .................................................. 13

4.2. Pin Layout ............................................... 16

5. Hardware Commands ........................................... 17

5.1. Auto-Turning ON the GE866-QUAD ........................... 17

5.2. Turning OFF the GE866-QUAD ............................... 19

5.3. Resetting the GE866-QUAD ................................. 21

5.3.1. Hardware Unconditional restart ............................. 21

6. Power Supply ................................................ 24

6.1. Power Supply Requirements ................................ 24

6.2. Power Consumption ........................................ 26

6.3. General Design Rules ..................................... 27

6.3.1. Electrical Design Guidelines ............................... 27

6.3.2. Thermal Design Guidelines .................................. 30

6.3.3. Power Supply PCB layout Guidelines ......................... 32

7. Antenna ..................................................... 34

7.1. GSM Antenna Requirements ................................. 34

7.1.1. GE866-QUAD Antenna – PCB line Guidelines ................... 34

7.2. PCB Design Guidelines .................................... 37

7.2.1. Transmission line design ................................... 37

7.2.2. Transmission line measurements ............................. 38

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7.3. GSM Antenna - installation Guidelines .................... 39

8. Logic levels specifications ................................. 40

8.1. Reset signal ............................................. 41

9. Serial Ports ................................................ 43

9.1. Modem Serial Port ........................................ 43

9.2. RS232 levels translation ................................. 46

10. Audio Section Overview ...................................... 48

10.1. MIC Connection ......................................... 48

10.2. EAR Connection ......................................... 48

10.3. Electrical Characteristics ............................. 50

10.3.1. Input lines .............................................. 50

10.3.2. Output lines ............................................. 51

11. General Purpose I/O ......................................... 52

11.1. GPIO Logic Levels ...................................... 53

11.2. Using a GPIO Pad as INPUT .............................. 54

11.3. Using a GPIO Pad as OUTPUT ............................. 54

11.4. Using the RF Transmission Control GPIO4 ................ 54

11.5. Using the RFTXMON Output GPIO5 ......................... 55

11.6. Using the ALARM/BUZZER output GPIO6 .................... 55

11.7. Magnetic Buzzer Concepts ............................... 57

11.7.1. Short Description ........................................ 57

11.7.2. Frequency Behaviour ...................................... 58

11.7.3. Power Supply Influence ................................... 58

11.7.4. Working Current Influence ................................ 58

11.8. STAT LED Indication of network service availability .... 59

11.9. SIMIN detect function .................................. 60

11.10. RTC Bypass out ......................................... 60

11.11. SIM Holder Implementation .............................. 60

12. DAC and ADC section ......................................... 61

12.1. DAC Converter .......................................... 61

12.1.1. Description .............................................. 61

12.1.2. Enabling DAC ............................................. 61

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12.1.3. Low Pass Filter Example .................................. 62

12.2. ADC Converter .......................................... 62

12.2.1. Description .............................................. 62

12.2.2. Using ADC Converter ...................................... 63

13. Mounting the GE866 on your Board ............................ 64

13.1. General ................................................ 64

13.2. Module finishing & dimensions .......................... 64

13.3. Recommended foot print for the application (dimensions in mm): 65

13.4. Stencil ................................................ 66

13.5. PCB pad design ......................................... 66

13.6. Recommendations for PCB pad dimensions (mm): ........... 67

13.7. Solder paste ........................................... 69

13.8. GE866 Solder reflow .................................... 70

14. Packing system .............................................. 72

14.1. Packing on reel ........................................ 72

14.2. Packing on tray ........................................ 73

14.3. Moisture sensibility ................................... 74

15. Conformity Assessment Issues ...................................... 75

15.1. GE866-QUAD ............................................. 77

16. Safety Recommendations ...................................... 81

17. Document History ............................................ 82

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1. Introduction

1.1. Scope

The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE866-QUAD module.

1.2. Audience

This document is intended for Telit customers, who are integrators, about to implement their applications using our GE866-QUAD modules.

1.3. Contact Information, Support

For general contact, technical support, to report documentation errors and to order manuals, contact Telit Technical Support Center (TTSC) at:

TS-EMEA@telit.com TS-NORTHAMERICA@telit.com TS-LATINAMERICA@telit.com TS-APAC@telit.com

Alternatively, use:

http://www.telit.com/en/products/technical-supportcenter/contact.php

For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit:

http://www.telit.com

To register for product news and announcements or for product questions contact Telit Technical Support Center (TTSC).

Our aim is to make this guide as helpful as possible. Keep us informed of your comments and suggestions for improvements.

Telit appreciates feedback from the users of our information.

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1.4. Document Organization

This document contains the following chapters: Chapter 1: “Introduction” provides a scope for this document,

target audience, contact and support information, and text conventions.

Chapter 2: “Overview” provides an overview of the document. Chapter 3: “GE866-QUAD Mechanical Dimensions” Chapter 4: “GE866-QUAD Module Connections” deals with the pin

out configuration and layout. Chapter 5: “Hardware Commands” How to operate on the module

via hardware. Chapter 6: “Power supply” Power supply requirements and

general design rules. Chapter 7: “Antenna” The antenna connection and board layout

design are the most important parts in the full product design.

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Chapter 8: “Logic Level specifications” Specific values adopted in the implementation of logic levels for this module.

Chapter 9: “Serial ports” The serial port on the Telit GE866QUAD is the core of the interface between the module and OEM hardware

Chapter 10: “Audio Section overview” Refers to the audio blocks of the Base Band Chip of the GE866-QUAD Telit Modules.

Chapter 11: “General Purpose I/O” How the general purpose I/O pads can be configured.

Chapter 12 “DAC and ADC Section” Deals with these two kind of converters.

Chapter 13: “Mounting the GE866 on your Board” Recommendations and specifics on how to mount the module on the user’s board.

Chapter 14: “Packing system” Recommendations and specifics on how the system is packaged.

Chapter 15: “Safety Recommendations” Recommendations and specifics on how the system is packaged.

Chapter 16: “Document History” Holds all document changes

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1.5. Text Conventions

Danger – This information MUST be followed or catastrophic equipment failure or bodily injury may occur.

Caution or Warning – Alerts the user to important points about integrating the module, if these points are not followed, the module and end user equipment may fail or malfunction.

Tip or Information – Provides advice and suggestions that may be useful when integrating the module.

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All dates are in ISO 8601 format, i.e. YYYY-MM-DD.

1.6. Related Documents

• Telit GSM/GPRS Family Software User Guide, 1vv0300784

• Audio settings application note , 80000NT10007a

• Digital Voice Interface Application Note, 80000NT10004a

• GE866-QUAD Product description, 80416ST10122A

• SIM Holder Design Guides, 80000NT10001a

• AT Commands Reference Guide, 80000ST10025a

• Telit EVK2 User Guide, 1vv0300704

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2. Overview

The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE866-QUAD 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 cannot embrace all hardware solutions and products that may be designed. Avoiding the wrong solutions shall be considered as mandatory. While the suggested hardware configurations shall not be considered mandatory, the information given shall be used as a guide and a starting point for properly developing your product with the Telit GE866-QUAD module. For further hardware details that may not be explained in this document refer to the Telit GE866QUAD Product Description document where all the hardware information is reported.

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NOTE:

The integration of the GSM/GPRS GE866-QUAD cellular module within user application shall be done according to the design rules described in this manual.

The information presented in this document is believed to be accurate and reliable. However, no responsibility is assumed by Telit Communications S.p.A. 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 Communications S.p.A. other than for circuitry embodied in Telit products. This document is subject to change without notice.

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3. GE866-QUAD Mechanical Dimensions

The GE866-QUAD overall dimensions are:

• Length: 17.2 mm

• Width: 13.2 mm

• Thickness: 2.1 mm

• Weight: 1.5 g

Figure 1

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med

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4. GE866-QUAD module connections

4.1. PIN-OUT

Pad Signal I/O

E7 D7 G7 F7 F6

C7 B7 A7 A6

All GPI0

can be

program

C2 C1

B1 A4

F4 E4

F5 G4

EAR- AO

EAR+ AO

MIC- AI Mic. signal input; phase- Audio

MIC+ AI Mic. signal input; phase+ Audio

AGND - Analog Ground Power

SIMVCC - External SIM signal – Power supply for the SIM 1,8 / 3V

SIMRST O External SIM signal – Reset 1,8 / 3V

SIMCLK O External SIM signal – Clock 1,8 / 3V

SIMIO I/O External SIM signal – Data I/O 4.7k Pull up

SIMIN I Presence SIM input CMOS 1.8V

RXD_AUX I Auxiliary UART (RX Data) CMOS 1.8V TXD_AUX O Auxiliary UART (TX Data) CMOS 1.8V

C109/DCD/GPO O

C125/RING/GPO O

C107/DSR/GPO O

C108/DTR/GPI I

C105/RTS/GPI I

C106/CTS/GPO O

C103/TXD I Serial data input (TXD) from DTE CMOS 1.8V C104/RXD O Serial data output to DTE CMOS 1.8V

ADC_IN AI Analog/Digital converter input A/D

DAC_OUT AO

VRTC AO

RESET* I Reset input CMOS 1.8V

Function Note Type

Audio

Earphone signal output, phase - Audio

Earphone signal output, phase + Audio

SIM card interface

Trace

Prog. / Data + HW Flow Control

Output for Data carrier detect signal (DCD) to DTE

/ GP output

Output for Ring indicator signal (RI) to DTE

/ GP output

Output for Data set ready signal (DSR) to DTE

/ GP output

Input for Data terminal ready signal (DTR) from DTE

/ GP input

Input for Request to send signal (RTS) from DTE

/ GP input

Output for Clear to send signal (CTS) to DTE

/ GP output

DAC and ADC

Digital/Analog converter output D/A

Miscellaneous Functions

VRTC Backup 2.3V Power

1,8 / 3V

CMOS 1.8V

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Pad Signal I/O

G6 G2

E2 E1 F6 D1 F1

G1 D2 F2 C3 E3 F3 G3

D3 D4 E5 G5 B6 E6

V_AUX / PWRMON O

Antenna I/O Antenna pad – 50 Ω RF

GPIO_01 / DVI_WA0 I/O

GPIO_02 / JDR /

DVI_RX

GPIO_03 / DVI_TX I/O

GPIO_04 / TX Disable

/ DVI_CLK

GPIO_05 / RFTXMON I/O

GPIO_06 / ALARM /

BUZZER

GPIO_07 / STAT_LED I/O

VBATT - Main power supply (Baseband) Power

VBATT_PA - Main power supply (Radio PA) Power

AGND - AF Signal Ground (see audio section) AF Signal

GND - Ground Power GND - Ground Power GND - Ground Power GND - Ground Power GND - Ground Power GND - Ground Power GND - Ground Power GND - Ground Power GND - Ground Power

I/O

Function Note Type

1.8V stabilized output Imax=100mA / Power ON monitor

GPIO

GPIO01 Configurable GPIO

/ Digital Audio Interface (WA0)

GPIO02 I/O pin

/ Jammer Detect Report

/ Digital Audio Interface (RX)

GPIO03 GPIO I/O pin

/ Digital Audio Interface (TX)

GPIO04 Configurable GPIO

/ TX Disable input

/ Digital Audio Interface (CLK)

GPIO05 Configurable GPIO

/ Transmitter ON monitor

GPIO06 Configurable GPIO

/ ALARM

GPIO07 Configurable GPIO

/ Digital Audio Interface (CLK)

Power Supply

RESERVED

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Power Out 1.8V

CMOS 1.8V

WARNING:

Reserved pins must not be connected.

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WARNING:

VAUX output must not be used to supply any device on the customer application.

It is only provided as reference/supply voltage when voltage translation to 1V8 CMOS is needed.

When its use is necessary, it is strongly recommended to connect VAUX through a series resistor as closed as possible to the module in order to reduce the inrush current of the internal DC/DC supply. Use a low value resistor (e.g. 10 ohm, 1/3W) with a maximum power rating related to drained current.

NOTE:

If not used, almost all pins should be left disconnected. The only exceptions are the following pins:

Pin signal

E2, E1 VBATT & VBATT_PA

D1, F1, G1, D2, F2, C2,

E3, F3, G3

F6 AGND A4 TXD A5 RXD A1 RTS G6 V_AUX / PWRMON G4 RESET* C1 TXD_AUX C2 RXD_AUX

GND

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GPIO

4.2. Pin Layout

A B C D E F G

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TOP VIEW

C105/RTS C106/CTS TXD_AUX GND VABTT_PA

C108/DTR C109/DCD RXD_AUX GND VABTT GND ANT

C107/DSR C125/RING GND RESERVED

C103/TXD

C104/RXD

SIMIO RESERVED

GPIO_06/

ALRM/

BUZZER

GPIO_05/

RFTXMON

GPIO_07/ STAT_LED

GPIO_01/

DVI_WAO

GPIO_02/

JDR/

DVI_RX

RESERVED DAC_OUT ADC_IN RESET*

GPIO_04/

TX_DIS/ DVI_CLK

GPIO_03/

DVI_TX

GND GND GND

RESERVED VRTC RESERVED

RESERVED AGND

GND GND

V_AUX/ PWRMON

SIMCLK SIMRST SIMVCC EAR+ EAR- MIC+ MIC-

MISCELLANOUS POWER

NOTE:

The pins defined RESERVED must not be connected to any pin in the application.

AUDIO ANTENNA

SIM RESERVED/FU

SERIAL GND

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5. Hardware Commands

5.1. Auto-Turning ON the GE866-QUAD

To Auto-turn on the GE866-QUAD, the power supply must be applied on the power pins VBATT and VBATT_PA, after 1000 mseconds, the V_AUX / PWRMON pin will be at the high logic level and the module can be considered fully operating.

When the power supply voltage is between 3.22V and 3.4V, after 5000 m-seconds, the V_AUX / PWRMON pin will be at the high logic level and the module can be considered fully operating.

The following flow chart shows the proper turn on procedure:

Modem ON Proc.

PWR supply = ON?

Delay 300mS

Enter AT<CR>

PWMON = ON?

AT answer in

AT init sequence.

1second ?

Delay 1s - 5s for Low

Voltage Operating

PWMON = ON?

Modem Reset Proc.

Delay 1s

NOTE:

Start AT CMD.

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The power supply must be applied either at the same time on pins VBATT and VBATT_PA, or first applied on VBATT_PA and then on VBATT. The opposite sequence shall be avoided. The reverse procedure applies for powering down the module: first disconnect VBATT, then VBATT_PA, or both at once.

NOTE:

In order to prevent a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE866-QUAD when the module is powered OFF or during an ON/OFF transition.

A flow chart showing the AT commands managing procedure is

displayed below:

Start AT CMD.

Delay 300mS

Enter AT<CR>

AT answer in

AT init sequence.

1second?

Disconnect PWR

supply

Modem ON Proc.

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5.2. Turning OFF the GE866-QUAD

Turning off of the device can be done in two ways:

• General turn OFF

• Processor turn OFF

General turn OFF – disconnect the power supply from the both power pins VBATT and VBATT_PA at the same time. In this case all parts of the module are in OFF condition, no power consumption is present.

Processor turn OFF – disconnect the power supply only from the power pin VBATT, the power pin VBATT_PA can be connected to power supply, in this case a low, about 30uA, power consumption is present

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Before either of both OFF procedures is applied, the AT#SYSHALT AT command must be sent (see AT Commands Reference Guide, 80000ST10025a), after the OK response message, wait for 10 seconds, then the module can be consider fully not operating and at this moment is possible disconnect the Power Supply.

The following flow chart shows the proper turnoff procedure:

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Modem OFF

Proc.

AT#SYSHALT

10s timeout

Disconnect PWR

supply

Delay 1.5s

WARNING:

PWRMON can be used to monitor only the power on but it cannot be used to monitor the power off because it remains high

NOTE:

In order to prevent a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE866-QUAD when the module is powered off or during an ON/OFF transition.

Modem ON Proc.

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5.3. Resetting the GE866-QUAD

5.3.1. Hardware Unconditional restart

WARNING:

The hardware unconditional Restart must not be used during normal operation of the device since it does not detach the device from the network. It shall be kept as an emergency exit procedure to be done in the rare case that the device gets stuck waiting for some network or SIM responses.

To unconditionally reboot the GE866-QUAD, 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.

NOTE:

Do not 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 GE866-QUAD power regulator and improper functioning of the module. The line RESET* must be connected only in open collector configuration; the transistor must be connected as close as possible to the RESET* pin.

TIP:

The unconditional hardware restart must always be implemented on the boards and the software must use it as an emergency exit procedure.

A simple circuit to do it is:

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Reset = LOW

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In the following flow chart is detailed the proper restart procedure:

Modem Reset

Proc.

Delay 200ms

Reset = HIGH

Delay 1s

Start AT CMD.

NOTE:

In order to prevent a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the

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digital pins of the GE866-QUAD when the module is powered OFF or during an ON/OFF transition.

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Extended Operating Voltage Range

3.10 V÷ 4.50 V

6. 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 performance, hence read the requirements carefully and the guidelines that will follow for a proper design.

6.1. Power Supply Requirements

The external power supply must be connected to VBATT & VBATT_PA signals and must fulfill the following requirements:

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POWER SUPPLY

Nominal Supply Voltage Normal Operating Voltage Range

3.8 V

3.40 V÷ 4.20 V

NOTE:

The Operating Voltage Range MUST never be exceeded; care must be taken when designing the application’s power supply section to avoid having an excessive voltage drop.

If the voltage drop is exceeding the limits it could cause a Power Off of the module.

The Power supply must be higher than 3.22 V to power on the module.

NOTE:

Overshoot voltage (regarding MAX Extended Operating Voltage) and drop in voltage (regarding MIN Extended Operating Voltage) MUST never be exceeded;

The “Extended Operating Voltage Range” can be used only with complete assumption and application of the HW User guide suggestions.

NOTE:

When the power supply voltage is between 3.22V and 3.4V, after 5000 m-seconds, the V_AUX / PWRMON pin will be at the high

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logic level and the module can be consider fully operating. See Par. 5.1.

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1.7 Paging Multiframe 2

1.5 Paging Multiframe 3

DCS1800 CSD PL0

150

DCS1800 PL0

250

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6.2. Power Consumption

The GE866-QUAD preliminary power consumptions are:

GE866-QUAD

Mode

SWITCHED OFF

Switched Off Switched Off with

AT#SYSHALT

IDLE mode

AT+CFUN=1 9 Normal mode: full functionality of the module AT+CFUN=4 9

Average

(mA)

Typical 2uA

max 20uA

<500uA

Mode description

Module power supplied only on VBATT_PA pin, the VBATT pin is not power supplied.

Module power supplied on VBATT_PA pin and VBATT pin, the command AT#SYSHALT is applied.

Disabled TX and RX; module is not registered on the network

AT+CFUN=0 or =5

CSD TX and RX mode

GPRS (class 1) 1TX + 1RX

DCS1800 PL0 140

GPRS (class 10) 2TX + 3RX

1.3 0,8

The GSM system is made in a way that the RF transmission is not continuous, but it is packed into bursts at a base frequency of approx. 217 Hz, and the relative current peaks can be as high as about 2A. Therefore the power supply has to be designed to withstand 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 approx. 217 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.

Paging Multiframe 4 Paging Multiframe 9

GSM VOICE CALL GSM900 CSD PL5 200

GPRS Sending data mode GSM900 PL5 200

GPRS Sending data mode GSM900 PL5 330

NOTE:

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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.

6.3. General Design Rules

The principal guidelines for the Power Supply Design embrace three different design steps:

• The electrical design

• The thermal design

• Thermal PCB layout

6.3.1. Electrical Design Guidelines

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The electrical design of the power supply depends strongly on the power source from which this power is drained. We will distinguish them into three categories:

• +5V input (typically PC internal regulator output)

• +12V input (typically automotive)

• Battery

6.3.1.1. + 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 GE866-QUAD, 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 GE866-QUAD from power polarity inversion.

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An example of linear regulator with 5V input is:

6.3.1.2. +

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 GE866-QUAD.

• 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.

• In any case the frequency and Switching design selection is

related to the application to be developed due to the fact the switching frequency could also generate EMC interferences.

• 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 GE866-QUAD from power polarity

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inversion. This can be the same diode as for spike protection.

An example of switching regulator with 12V input is in the below schematic:

6.3.1.3. 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 GE866-QUAD module.

WARNING:

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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 GE866-QUAD and damage it.

NOTE:

DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GE866-QUAD. Their use can lead to overvoltage on the GE866-QUAD 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 GE866-QUAD 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.

6.3.2. Thermal Design Guidelines

The thermal design for the power supply heat sink should be done with the following specifications:

See Par. 6.2 Power Consumption

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.

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.

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For the heat generated by the GE866-QUAD, 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 GE866-QUAD; you must ensure that your application can dissipate it.

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6.3.3. 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 performance.

• The Bypass low ESR capacitor must be placed close to the

Telit GE866-QUAD 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 GE866-QUAD 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 approx. 217 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 GE866-QUAD, then this noise is not so disturbing and power supply layout design can be more forgiving.

• The PCB traces to the GE866-QUAD 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.

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• 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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824-894 MHz GSM850 band

Impedance

50 Ohm

Input power

> 2 W

7. Antenna

The antenna connection and board layout design are the most important aspect in the full product design as they strongly affect the product overall performance, hence read carefully and follow the requirements and the guidelines for a proper design.

7.1. GSM Antenna Requirements

As suggested on the Product Description the antenna and antenna transmission line on PCB for a Telit GE866-QUAD device shall fulfill the following requirements:

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ANTENNA REQUIREMENTS

Frequency range

VSWR absolute max ≤ 10:1 (limit to avoid permanent damage) VSWR recommended ≤ 2:1 (limit to fulfill all regulatory requirements)

880-960 MHz GSM900 band 1710-1885MHz DCS1800 band 1850-1990MHz PCS1900 band

Furthermore if the devices are developed for the US market and/or Canada market they shall comply to the FCC and/or IC approval requirements:

Those devices are to be used only for mobile and fixed application. The antenna(s) used for this transmitter 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. End-Users must be provided with transmitter operation conditions for satisfying RF exposure compliance. OEM integrators must ensure that the end user has no manual instructions to remove or install the GE866-QUAD. Antennas used for those OEM modules must not exceed 3dBi gain for mobile and fixed operating configurations.

7.1.1. GE866-QUAD Antenna – PCB line Guidelines

When using the Telit GE866-QUAD module, since there's no antenna connector on the module, the antenna must be connected

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to the GE866-QUAD through the PCB with the antenna pad (pin

G2).

WARNING:

High Frequency harmonics may still not be sufficiently attenuated in the GE866’s small package. The suggested Pi network, between antenna output of the module and antenna connector on application board, is used to meet the standard specifications.

In first designs its use is strongly recommended.

In the case that the antenna is not directly developed on the same PCB, hence directly connected at the antenna pad of the GE866-QUAD, then a PCB line is needed in order to connect with it or with its connector.

This transmission line shall fulfill the following requirements:

ANTENNA LINE ON PCB REQUIREMENTS Impedance Max Attenuation

50 ohm 0,3 dB

No coupling with other signals allowed Cold End (Ground Plane) of antenna shall be equipotential to the GE866-QUAD ground pins

This transmission line should be designed according to the following guidelines:

• Ensure that the antenna line impedance is 50 ohm;

• Keep the antenna line on the PCB as short as possible, since

the antenna line loss shall be less than 0,3 dB;

• Antenna line must have uniform characteristics, constant

cross section, avoid meanders and abrupt curves;

• Keep, if possible, one layer of the PCB used only for the

Ground plane;

• Surround (on the sides, over and under) the antenna line on

PCB with Ground, avoid having other signal tracks facing directly the antenna line track;

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• The ground around the antenna line on PCB has to be strictly

connected to the Ground Plane by placing vias every 2mm at least;

• Place EM noisy devices as far as possible from GE866-QUAD

antenna line;

• Keep the antenna line far away from the GE866-QUAD power

supply lines;

• If you have EM noisy devices around the PCB hosting the

GE866-QUAD, such as fast switching ICs, take care of the shielding of the antenna line by burying it inside the layers of PCB and surround it with Ground planes, or shield it with a metal frame cover.

• If you don't have EM noisy devices around the PCB of GE866-

QUAD, by using a micro strip on the superficial copper layer for the antenna line, the line attenuation will be lower than a buried one.

Mod. 0805 2011-07 Rev.2

7.2. PCB Design Guidelines

This section explains the suggested design for the transmission line on the customer’s application board.

7.2.1. Transmission line design

During the design of the GE866-QUAD interface board, the placement of components has been chosen properly, in order to keep the line length as short as possible, thus leading to lowest power losses possible. A Grounded Coplanar Waveguide (G-CPW) line has been chosen, since this kind of transmission line ensures good impedance control and can be implemented in an outer PCB layer as needed in this case. A SMA female connector has been used to feed the line.

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The interface board is realized on a FR4, 4-layers PCB. Substrate material is characterized by relative permittivity εr = 4.6 ± 0.4 @ 1 GHz, TanD= 0.019 ÷ 0.026 @ 1 GHz.

A characteristic impedance of nearly 50 Ω is achieved using trace width = 1.1 mm, clearance from coplanar ground plane =

0.3 mm each side. The line uses reference ground plane on layer 3, while copper is removed from layer 2 underneath the line. Height of trace above ground plane is 1.335 mm.

Calculated characteristic impedance is 51.6 Ω, estimated line loss is less than 0.1 dB. The line geometry is shown below:

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7.2.2. Transmission line measurements

HP8753E VNA (Full-2-port calibration) has been used in this measurement session. A calibrated coaxial cable has been soldered at the pad corresponding to GE866-QUAD RF output; a SMA connector has been soldered to the board in order to characterize the losses of the transmission line including the connector itself. During Return Loss / impedance measurements,

the transmission line has been terminated to 50 Ω load.

Return Loss plot of line under test is shown below:

Line input impedance (in Smith Chart format, once the line has been terminated to 50 Ω load) is shown in the following

figure:

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Insertion Loss of G-CPW line plus SMA connector is shown below:

7.3. GSM Antenna - installation Guidelines

• Install the antenna in a place covered by the GSM signal.

• Antenna shall not be installed inside metal cases

• Antenna shall be installed also according to antenna

manufacturer instructions.

• Ddd Installation should also take in account the R&TTE

requirements described in the “Conformity Assessment Issues” chapter

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(CMOS 1.8) when on

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8. Logic levels specifications

Where not specifically stated, all the interface circuits work at 1.8V CMOS logic levels. The following table shows the logic level specifications used in the GE866-QUAD interface circuits:

Parameter Min Max

Input level on any digital pin

Level Min Max

Input high level

1.3V 1.9V

Input low level Output high level

1.6V 1.9V

Output low level

-0.3V +2.1V

0V 0.35V

0V 0.2V

Level Typical

Output Current 1mA

Input Current 1uA

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RESET* Input low

0V 0.2V

8.1. Reset signal

Signal Function I/O pin

RESET* Phone reset I G4

RESET* is used to reset the GE866-QUAD. Whenever this signal is pulled low, the GE866-QUAD is reset. When the device is reset it stops any operation. After the release of the reset GE866-QUAD is unconditionally shut down, without doing any detach operation from the network where it is registered. This behaviour is not a proper shut down because any GSM device is requested to issue a detach request on turn off. For this reason the Reset signal must not be used to normally shutting down the device, but only as an emergency exit in the rare case the device remains stuck waiting for some network response.

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The RESET* is internally controlled on start-up to achieve a proper power-on reset sequence, so there's no need to control this pin on start-up. It may only be used to reset a device already on that is not responding to any command.

NOTE:

Do not use this signal to power OFF the GE866-QUAD. Use the ON/OFF procedure to perform this function.

Signal Min Max

RESET* Input high 1.8V(NOTE1) 2.1V

(NOTE1) this signal is internally pulled up so the pin can be left floating if not used.

If unused, this signal may be left unconnected. If used, then it must always be connected with an open collector transistor, to permit to the internal circuitry the power on reset and under voltage lockout functions.

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pad when on

9. Serial Ports

The serial port on the GE866-QUAD is the core of the interface between the module and OEM hardware.

2 serial ports are available on the module:

• MODEM SERIAL PORT 1 (Main, ASC0)

• MODEM SERIAL PORT 2 (Auxiliary, ASC1)

9.1. Modem Serial Port

Several configurations can be designed for the serial port on the OEM hardware, but the most common are:

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• RS232 PC com port

• microcontroller UART @ 1.8V (Universal Asynchronous Receive

Transmit)

• microcontroller UART @ 3V or other voltages different from

1.8V

• microcontroller UART @ 5V or other voltages different from

1.8V

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 1.8V UART.

The serial port on the GE866-QUAD is a +1.8V UART with all the 8 RS232 signals. It differs from the PC-RS232 in the signal polarity (RS232 is reversed) and levels. The levels for the GE866-QUAD UART are the CMOS levels:

Parameter Min Max

Input level on any digital

-0.3V +2.1V

Input voltage on analog pads when on

Level Min Max

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-0.3V +2.1V

Output from the

GE866

QUAD

that

Input receive of the

GE866

QUAD

Input to the

GE866

QUAD

that

Output from the

GE866

QUAD

that

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Input high level V

1.5V 1.9V

Input low level VIL 0V 0.35V Output high level VOH 1.6V 1.9V Output low level VOL 0V 0.2V

The signals of the GE866-QUAD serial port are:

RS232 Pin

Number

1 DCD - dcd_uart B2 Data Carrier Detect

2 RXD - tx_uart A5

3 TXD - rx_uart A4 Receive line *see Note

4 DTR - dtr_uart A2 Data Terminal Ready

5 GND

6 DSR - dsr_uart A3 Data Set Ready

7 RTS - rts_uart A1 Request to Send

8 CTS - cts_uart B1 Clear to Send

9 RI - ri_uart B3 Ring Indicator

Signal GE866-QUAD

Pad Number

D1, F1, G1, D2,

F2, C2, E3, F3,

Name Usage

Transmit line *see

Note

Ground Ground

NOTE:

indicates the carrier presence Output transmit line of GE866QUAD UART

UART Input to the GE866-QUAD that controls the DTE READY condition

Output from the GE866-QUAD that indicates the module is ready

controls the Hardware flow control Output from the GE866-QUAD that controls the Hardware flow control

indicates the incoming call condition

According to V.24, RX/TX signal names are referred to the application side, therefore on the GE866-QUAD 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 GE866-QUAD serial port and vice versa for RX.

NOTE:

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.

NOTE:

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In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE866-QUAD when the module is powered off or during an ON/OFF transition.

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9.2. RS232 levels translation

In order to interface the GE866-QUAD 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 0/1.8V 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 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 drivers and receivers and in the levels (be sure to get a true RS232 level translator not a RS485 or other standards).

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By convention the driver is the level translator from the 0-

1.8V UART to the RS232 level. The receiver is the translator from the RS232 level to 0-1.8V UART.

In order to translate the whole set of control lines of the UART you will need:

• 5 drivers

• 3 receivers

NOTE:

The digital input lines working at 1.8V CMOS have an absolute maximum input voltage of 2.1V; therefore the level translator IC shall not be powered by the +3.8V supply of the module. Instead, it must be powered from a +1.8V (dedicated) power supply.

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An example of RS232 level adaptation circuitry could be done using a MAXIM transceiver (MAX218).

In this case the chipset is capable to translate directly from 0/1.8V to the RS232 levels (Example done on 4 signals only).

The RS232 serial port lines are usually connected to a DB9 connector with the following layout:

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EAR+

TELIT MODU

OUTPUT

DAC

GE866-DUAL Hardware User Guide

10. Audio Section Overview

10.1. MIC Connection

The Base Band Chip of the GE866-QUAD provides one input for audio to be transmitted (Uplink).

10.2. EAR Connection

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EAR-

The audio output of the GE866-QUAD is balanced, this is helpful to double the level and to reject common mode (click and pop are common mode and therefore rejected); furthermore the output stage is class-D, so it can manage directly a loudspeaker with electrical impedance of at least 8Ohm. This stage is powered by switching from Vbatt to gnd at a frequency ranging from 0.6 to 2MHz, so it has a good efficiency and thus a big power budget 0.7W; being a class-D architecture, please use some caution (see the NOTE below).

NOTE:

When the loudspeaker is connected with a long cable, an L-C filter is recommended.

When the EAR+/- are feeding some electronic circuitry, an R-C filter is recommended.

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EAR

TELIT MODULE

OUTPUT

DAC

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TIP: In order to get the maximum audio level at a given output

voltage level (dBspl/Vrms), the following breaking through procedure can be used. Have the loudspeaker as close as you can to the listener (this simplify also the echo cancelling); choose the loudspeaker with the higher sensitivity (dBspl per W); choose loudspeakers with the impedance close to the limit (ex: 16 or 8 Ohm), in order to feed more power inside the transducer (it increases the W/Vrms ratio). If this were not enough, an external amplifier should be used.

WARNING:

This The audio output hardware of the GE866-QUAD is based on a Class-D amplifier so any singled-end output configuration MUST NOT BE USED, otherwise the presence of GSM buzzing and low level audio performance will result.

EAR+

GND

L-C filtering for LOW impedance load.

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GND

HiZ CIRCUITRY

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EAR+

OUTPUTDAC

EAR-

R-C filtering for HIGH impedance load.

10.3. Electrical Characteristics

10.3.1. Input lines

Microphone/Line-in path

Line Type Differential Coupling capacitor ≥ 100nF Differential input resistance 50kΩ

Levels

To have 0 dBfs @1KHz MIC Gain = 0dB 290mVrms MIC Gain = +6dB 145mVrms MIC Gain = +12dB 72mVrms MIC Gain = +18dB 36mVrms MIC Gain = +24dB 18mVrms MIC Gain = +30dB 9mVrms MIC Gain = +36dB 4.5mVrms MIC Gain = +42dB 2.25mVrms

(*)

Differential input voltage

(*) 0 dBfs in the network are +3.14 dBm0

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max. differential output voltage

1120 mV

@3.14dBm0

(*)

10.3.2. Output lines

Differential line coupling output load resistance ≥ 8 Ω

signal bandwidth 250÷3400Hz

differential output voltage 550mV volume increment 2dB per step

volume steps 0..10

(*) in default condition: Output Volume = +20dB, Output Attenuation = 0dB

EAR/Line-out Output

Direct connection (VDC=1.7÷2.1V)

(@ -3dB with default filter)

rms

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@0dBm0 (*)

TIP: We suggest driving the load differentially; this kills all the

common mode noises (click and pop, for example), the output swing will double (+6dB) and the big output coupling capacitor will be avoided.

In order to get the maximum power output from the device, the resistance of the tracks has to be negligible in comparison to the load.

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current

Reset

11. 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 be read; they report the digital value (high or low) present on the pad at the read time.

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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 GE866-QUAD firmware and acts depending on the function implemented.

For Logic levels please refer to chapter 8.

The following table shows the available GPIO on the GE866QUAD.

Pin Signal I/O Function Type Input /

C5 GPIO_01 I/O Configurable GPIO

C6 GPIO_02 I/O Configurable GPIO

D6 GPIO_03 I/O Configurable GPIO

D5 GPIO_04 I/O Configurable GPIO

B5 GPIO_05 I/O Configurable GPIO

B4 GPIO_06 I/O Configurable GPIO

C4 GPIO_07 I/O Configurable GPIO

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

output

1uA/1mA INPUT 0 0

Default

State

ON_OFF

state

State

during

Note

Alternate function

DVI_WA0

Alternate function JDR and DVI_RX

Alternate function

DVI_TX

Alternate function

TX Disable and

DVI_TX

Alternate function

RFTXMON

Alternate function

ALARM / BUZZER

Alternate function

STAT_LED

WARNING:

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During power up the GPIOs may be subject to transient glitches.

Also the UART‘s control flow pins can be used as GPIO.

Pin Signal I/O Function Type Input /

B2 GPO_A O Configurable GPO

B3 GPO_B O Configurable GPO

A3 GPO_C O Configurable GPO

A2 GPI_E I Configurable GPI

A1 GPI_F I Configurable GPI

B1 GPO_D O Configurable GPO

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

CMOS

1.8V

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output

current

1uA/1mA INPUT 0 0

Default

State

ON_OFF

state

State

during

Reset

Note

Alternate function

C109/DCD

Alternate function

C125/RING

Alternate function

C107/DSR

Alternate function

C108/DTR

Alternate function

C105/RTS

Alternate function

C106/CTS

11.1. GPIO Logic Levels

Where not specifically stated, all the interface circuits work at 1.8V CMOS logic levels.

The following table shows the logic level specifications used in the GE866-QUAD interface circuits:

Parameter Min Max

Input level on any digital pin

(CMOS 1.8) when on

Level Min Max

Input high level Input low level Output high level Output low level

Level Typical

-0.3V +2.1V

1.5V 1.9V 0V 0.35V

1.6V 1.9V 0V 0.2V

Output Current 1mA

Input Current 1uA

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11.2. 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

1.8V 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 1.8V CMOS, then it can be buffered with an open collector transistor with a 47K pull up to 1.8V.

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NOTE:

In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE866-QUAD when the module is powered OFF or during an ON/OFF transition.

TIP:

The V_AUX / PWRMON pin can be used for input pull up reference or/and for ON monitoring.

11.3. Using a GPIO Pad as OUTPUT

The GPIO pads, when used as outputs, can drive 1.8V 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.

11.4. Using the RF Transmission Control GPIO4

The GPIO4 pin, when configured as RF Transmission Control Input, permits to disable the Transmitter when the GPIO is set to Low by the application.

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In the design is necessary to add a resistor 47K pull up to

2.8V, this pull up must be switched off when the module is in off condition.

11.5. Using the RFTXMON Output GPIO5

The GPIO5 pin, when configured as RFTXMON Output, is controlled by the GE866-QUAD module and will rise when the transmitter is active and fall after the transmitter activity is completed.

There are 2 different modes for this function:

1) Active during the Call:

For example, if a call is started, the line will be HIGH during all the conversation and it will be again LOW after hanged up.

The line rises up 300ms before first TX burst and will became again LOW from 500ms to 1s after last TX burst.

2) Active during the TX activity

The GPIO is following the TX bursts

Please refer to the AT User interface manual for additional information on how to enable this function.

11.6. Using the ALARM/BUZZER output GPIO6

The GPIO6 has 2 alternate functions:

• ALARM

• BUZZER

The GPIO6 pad, when configured as Alarm Output, is controlled by the GE866-QUAD module and will rise when the alarm starts and fall after the issue of a dedicated AT command.

This output can be used to controlling microcontroller or application at the alarm time.

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The GPIO6 pad, when configured as Buzzer Output, is controlled by the GE866-QUAD module and will drive a Buzzer driver with appropriate square waves.

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.

A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the GPIO6:

+V buzzer

4,7K

TR2

SMBT2907A

D1N4148

R2 1K

33pF

GPIO7

TR1

BCR141W

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

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11.7. Magnetic Buzzer Concepts

11.7.1. Short Description

A magnetic Buzzer is a sound-generating device with a coil located in the magnetic circuit consisting of a permanent magnet, an iron core, a high permeable metal disk and a vibrating diaphragm.

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Drawing of the Magnetic Buzzer.

The disk and diaphragm are attracted to the core by the magnetic field. When an oscillating signal is moved through the coil, it produces a fluctuating magnetic field which vibrates the diaphragm at the frequency of the drive signal. Thus the sound is produced relative to the frequency applied.

Diaphragm movement.

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11.7.2. Frequency Behaviour

The frequency behavior represents the effectiveness of the reproduction of the applied signals. Because performance is related to a square driving waveform (whose amplitude varies from 0V to Vpp), if you modify the waveform (e.g. from square to sinus) the frequency response will change.

11.7.3. Power Supply Influence

Applying a signal whose amplitude is different from that suggested by the manufacturer, the performance change following the rule “if resonance frequency fo increases, amplitude decreases”.

Because resonance frequency depends on acoustic design, by lowering the amplitude of the driving signal the response bandwidth tends to become narrow, and vice versa.

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Summarizing: Vpp ↑  fo ↓ Vpp ↓ fo ↑ The risk is that the fo could easily fall outside of new

bandwidth; consequently the SPL could be much lower than the expected.

WARNING:

It is very important to respect the sense of the applied voltage: never apply to the "-" pin a voltage more positive than the "+" pin: if this happens, the diaphragm vibrates in the opposite direction with a high probability to be expelled from its physical position. This damages the device permanently.

11.7.4. Working Current Influence

In the component data sheet you will find the value of MAX CURRENT: this represents the maximum average current that can flow at nominal voltage without current limitation. In other words it is not the peak current, which could be twice or three times higher. If driving circuitry does not support these peak values, the SPL will never reach the declared level or the oscillations will stop.

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11.8. STAT LED Indication of network service

availability

The STAT_LED pin status shows information on the network service availability and Call status.

In the GE866-QUAD modules, the STAT_LED usually needs an external transistor to drive an external LED.

Therefore, the status indicated in the following table is reversed with respect to the pin status.

LED status Device Status

Permanently off Device off Fast blinking

(Period 1s, Ton 0,5s) Slow blinking (Period 3s, Ton 0,3s)

Permanently on a call is active

Net search / Not registered / turning off

Registered full service

A schematic example could be:

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11.9. SIMIN detect function

All the GPIO pins can be used as SIM DETECT input. The AT Command used to enable the function is:

AT#SIMINCFG

Use the AT command AT#SIMDET=2 to enable the SIMIN detection Use the AT command AT&W0 and AT&P0 to store the SIMIN

detection in the common profile.

For full details see AT Commands Reference Guide, 80000ST10025a.

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NOTE:

Don’t use the SIM IN function on the same pin where the GPIO function is enabled and vice versa!

11.10. RTC Bypass out

The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital part, allowing having only RTC going on when all the other parts of the device are off.

To this power output a backup battery can be added in order to increase the RTC autonomy during power off of the main battery (power supply). NO Devices must be powered from this pin.

11.11. SIM Holder Implementation

Please refer to the related User Guide (SIM Holder Design Guides, 80000NT10001a).

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Voltage range (filtered)

1.8 Volt

12. DAC and ADC section

12.1. DAC Converter

12.1.1. Description

The GE866-QUAD provides a Digital to Analog Converter. The signal (named DAC_OUT) is available on pin E4 of the GE866QUAD.

The on board DAC is a 10 bit converter, able to generate an analogue value based on a specific input in the range from 0 up to 1023. However, an external low-pass filter is necessary

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Range 0 1023 Steps

The precision is 10 bits so, if we consider that the maximum voltage is 2V, the integrated voltage could be calculated with the following formula:

Integrated output voltage = (2 *value) / 1023 DAC_OUT line must be integrated (for example with a low band

pass filter) in order to obtain an analog voltage.

12.1.2. Enabling DAC

An AT command is available to use the DAC function. The command is: AT#DAC= [<enable> [, <value>]]

<value> - scale factor of the integrated output voltage (0..1023 - 10 bit precision)

it must be present if <enable>=1

Min Max Units

Refer to SW User Guide or AT Commands Reference Guide for the full description of this function.

NOTE:

The DAC frequency is selected internally. D/A converter must not be used during POWERSAVING.

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Min Max

Units

Resolution

12.1.3. Low Pass Filter Example

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12.2. ADC Converter

12.2.1. Description

The on board A/D converter is a 11-bit converter. It’s able to read a voltage level in the range of 0÷2 volts applied on the ADC pin input, store and convert it into 11 bit word.

Input Voltage range AD conversion

The GE866-QUAD module provides one Analog to Digital Converters.

The input line is:

ADC_IN

0 1.2

- 10

- > 1

Volt bits

Available on pin F4

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12.2.2. Using ADC Converter

An AT command is available to use the ADC function.

The command is AT#ADC=1,2

The read value is expressed in mV

Refer to SW User Guide or AT Commands Reference Guide for the full description of this function.

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Dimensions in mm

Surface finishing Ni/Au for all solder pads

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13. Mounting the GE866 on your Board

13.1. General

The GE866 modules have been designed in order to be compliant with a standard lead-free SMT process.

13.2. Module finishing & dimensions

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Top View

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13.3. Recommended foot print for the

application (dimensions in mm):

In order to easily rework the GE866 is suggested to consider on the application a 1.5 mm placement inhibit area around the module.

It is also suggested, as common rule for an SMT component, to avoid having a mechanical part of the application in direct contact with the module.

NOTE:

In the customer application, the region under WIRING INHIBIT (see figure above) must be clear from signal or ground paths

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PCB

Copper Pad

Solder Mask

SMD

NSMD

13.4. Stencil

Stencil’s apertures layout can be the same of the recommended footprint (1:1), we suggest a thickness of stencil foil ≥ 120 µm.

13.5. PCB pad design

Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB.

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(Solder Mask Defined)

(Non Solder Mask Defined)

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Solder resist openings

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13.6. Recommendations for PCB pad dimensions

(mm):

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Inhibit area for micro

via

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It is not recommended to place via or micro-via not covered by solder resist in an area of 0,3 mm around the pads unless it carries the same signal of the pad itself (see following figure).

Holes in pad are allowed only for blind holes and not for through holes.

Recommendations for PCB pad surfaces:

Finish Layer thickness [µm] Properties

Electro-less Ni / Immersion Au

The PCB must be able to resist the higher temperatures which are occurring at the lead-free process. This issue should be discussed with the PCB-supplier. Generally, the wettability of

3 –7 / 0.05 – 0.15

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good solder ability protection,

high shear force values

tin-lead solder paste on the described surface plating is better compared to lead-free solder paste.

It is not necessary to panel the application PCB, however in that case it is suggested to use milled contours and predrilled board breakouts; scoring or v-cut solutions are not recommended.

13.7. Solder paste

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Solder paste

Lead free

Sn/Ag/Cu

We recommend using only “no clean” solder paste in order to avoid the cleaning of the modules after assembly.

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up rate (TL to

Time within 5°C of actual

13.8. GE866 Solder reflow

Recommended solder reflow profile

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Profile Feature Pb-Free Assembly

Average rampTP)

Preheat – Temperature Min (Tsmin) – Temperature Max (Tsmax) – Time (min to max) (ts)

Tsmax to TL – Ramp-up Rate

Time maintained above: – Temperature (TL) – Time (tL)

Peak Temperature (Tp) 245 +0/-5°C

3°C/second max

150°C 200°C 60-180 seconds

3°C/second max

217°C 60-150 seconds

10-30 seconds

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Peak Temperature (tp)

Ramp-down Rate 6°C/second max.

Time 25°C to Peak Temperature 8 minutes max.

NOTE:

All temperatures refer to topside of the package, measured on the package body surface

WARNING:

The GE866 module withstands one reflow process only

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14. Packing system

14.1. Packing on reel

The GE866 modules are packaged on reels of 500 pieces each (TBC).

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14.2. Packing on tray

The GE866 modules are packaged on trays of 50 pieces each when small quantities are required (i.e. for test and evaluation purposes). Trays are not designed to be used in SMT processes for pick and place handling.

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WARNING:

These trays can withstand at the maximum temperature of 65° C.

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14.3. Moisture sensibility

The moisture sensitivity level of the Product is “3” according with standard IPC/JEDEC J-STD-020, take care of all the relative requirements for using this kind of components. Moreover, the customer has to take care of the following conditions:

a) The shelf life of the Product inside of the dry bag is 12 months from the bag seal date, when stored in a non-condensing atmospheric environment of < 40°C and < 90% RH. b) Environmental condition during the production: <= 30°C / 60% RH according to IPC/JEDEC J-STD-033B. c) The maximum time between the opening of the sealed bag and the reflow process must be 168 hours if condition b) “IPC/JEDEC J-STD-033B paragraph

5.2” is respected. d) Baking is required if conditions b) or c) are not respected e) Baking is required if the humidity indicator inside the bag indicates 10% RH or more.

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shodě se základními požadavky a dalšími příslušnými ustanoveními směrnice 1

999/5/ES.

elõírásainak.

Direktīvas 1999/5/EK būtiskajām prasībām un citiem ar to saistītajiem noteikumiem

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15. Conformity Assessment Issues

European Union - Directive 1999/5/EC

The GE866 QUAD complies with the essential requirements of the 1999/5/EC Directive.

Bulgarian С настоящето Telit Communications S.p.A. декларира, че Dual Band GSM/GPRS module

отговаря на съществените изисквания и другите приложими изисквания на Директива 1999/5/ЕС.

Czech Telit Communications S.p.A. tímto prohlašuje, že tento Dual Band GSM/GPRS module je ve

Danish Undertegnede Telit Communications S.p.A. erklærer herved, at følgende udstyr Dual Band

GSM/GPRS module overholder de væsentlige krav og øvrige relevante krav i direktiv 1999/5/EF.

Dutch Hierbij verklaart Telit Communications S.p.A. dat het toestel Dual Band GSM/GPRS

module in overeenstemming is met de essentiële eisen en de andere relevante bepalingen van richtlijn 1999/5/EG.

English Hereby, Telit Communications S.p.A., declares that this Dual Band GSM/GPRS module is in

compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC.

Estonian Käesolevaga kinnitab Telit Communications S.p.A. seadme Dual Band GSM/GPRS module

vastavust direktiivi 1999/5/EÜ põhinõuetele ja nimetatud direktiivist tulenevatele teistele asjakohastele sätetele.

German Hiermit erklärt Telit Communications S.p.A., dass sich das Gerät Dual Band GSM/GPRS

module in Übereinstimmung mit den grundlegenden Anforderungen und den übrigen einschlägigen Bestimmungen der Richtlinie 1999/5/EG befindet.

Greek ΜΕ ΤΗΝ ΠΑΡΟΥΣΑ Telit Communications S.p.A. ∆ΗΛΩΝΕΙ ΟΤΙ Dual Band GSM/GPRS

module ΣΥΜΜΟΡΦΩΝΕΤΑΙ ΠΡΟΣ ΤΙΣ ΟΥΣΙΩ∆ΕΙΣ ΑΠΑΙΤΗΣΕΙΣ ΚΑΙ ΤΙΣ ΛΟΙΠΕΣ ΣΧΕΤΙΚΕΣ ∆ΙΑΤΑΞΕΙΣ ΤΗΣ Ο∆ΗΓΙΑΣ 1999/5/ΕΚ.

Hungarian Alulírott, Telit Communications S.p.A. nyilatkozom, hogy a Dual Band GSM/GPRS module

megfelel a vonatkozó alapvetõ követelményeknek és az 1999/5/EC irányelv egyéb

Finnish Telit Communications S.p.A. vakuuttaa täten että Dual Band GSM/GPRS module tyyppinen

laite on direktiivin 1999/5/EY oleellisten vaatimusten ja sitä koskevien direktiivin muiden ehtojen mukainen.

French Par la présente Telit Communications S.p.A. déclare que l'appareil Dual Band GSM/GPRS

module est conforme aux exigences essentielles et aux autres dispositions pertinentes de la directive 1999/5/CE.

Icelandic Hér með lýsir Telit Communications S.p.A. yfir því að Dual Band GSM/GPRS module er í

samræmi við grunnkröfur og aðrar kröfur, sem gerðar eru í tilskipun 1999/5/EC

Italian Con la presente Telit Communications S.p.A. dichiara che questo modulo Dual Band

GSM/GPRS è conforme ai requisiti essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva 1999/5/CE.

Latvian Ar šo Telit Communications S.p.A. deklarē, ka Dual Band GSM/GPRS module atbilst

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Dirrettiva 1999/5/EC.

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Lithuanian Šiuo Telit Communications S.p.A. deklaruoja, kad šis Dual Band GSM/GPRS module

atitinka esminius reikalavimus ir kitas 1999/5/EB Direktyvos nuostatas.

Maltese Hawnhekk, Telit Communications S.p.A., jiddikjara li dan Dual Band GSM/GPRS module

jikkonforma mal-ħtiġijiet essenzjali u ma provvedimenti oħrajn relevanti li hemm fid-

Norwegian Telit Communications S.p.A. erklærer herved at utstyret Dual Band GSM/GPRS module er i

samsvar med de grunnleggende krav og øvrige relevante krav i direktiv 1999/5/EF.

Polish Niniejszym Telit Communications S.p.A. oświadcza, że Dual Band GSM/GPRS module jest

zgodny z zasadniczymi wymogami oraz pozostałymi stosownymi postanowieniami Dyrektywy 1999/5/EC

Portuguese Telit Communications S.p.A. declara que este Dual Band GSM/GPRS module está conforme

com os requisitos essenciais e outras disposições da Directiva 1999/5/CE.

Slovak Telit Communications S.p.A. týmto vyhlasuje, že Dual Band GSM/GPRS module spĺňa

základné požiadavky a všetky príslušné ustanovenia Smernice 1999/5/ES.

Slovenian Telit Communications S.p.A. izjavlja, da je ta Dual Band GSM/GPRS module v skladu z

bistvenimi zahtevami in ostalimi relevantnimi določili direktive 1999/5/ES.

Spanish Por medio de la presente Telit Communications S.p.A. declara que el Dual Band

GSM/GPRS module cumple con los requisitos esenciales y cualesquiera otras disposiciones aplicables o exigibles de la Directiva 1999/5/CE.

Swedish Härmed intygar Telit Communications S.p.A. att denna Dual Band GSM/GPRS module står

I överensstämmelse med de väsentliga egenskapskrav och övriga relevanta bestämmelser som framgår av direktiv 1999/5/EG.

In order to satisfy the essential requirements of 1999/5/EC Directive, GE866 QUAD module is compliant with the following standards:

RF spectrum use (R&TTE art. 3.2) EN 301 511 V9.0.2

EMC (R&TTE art. 3.1b) EN 301 489-1 V1.9.2

EN 301 489-7 V1.3.1

Health & Safety (R&TTE art. 3.1a) EN 60950-1:2006 + A11:2009 + A1:2010 + A12:2011 +

AC:2011

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1909

15.1. GE866-QUAD

The conformity assessment procedure referred to in Article 10 and detailed in Annex IV of Directive 1999/5/EC has been followed with the involvement of the following Notified Body:

AT4 wireless, S.A. Parque Tecnologico de Andalucía C/ Severo Ochoa 2 29590 Campanillas – Málaga SPAIN Notified Body No: 1909

Thus, the following marking is included in the product:

The full declaration of conformity can be found on the following address:

http://www.telit.com/

There is no restriction for the commercialisation of the GE866-QUAD module in all the countries of the European Union.

Final product integrating this module must be assessed against essential requirements of the 1999/5/EC (R&TTE) Directive. It should be noted that assessment does not necessarily lead to testing. Telit Communications S.p.A. recommends carrying out the following assessments:

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RF spectrum use (R&TTE art. 3.2)

EMC (R&TTE art. 3.1b) Testing

Health & Safety (R&TTE art. 3.1a) Testing

Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights

Reserved. Page 77 of 82

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It will depend on the antenna used on the final product.

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Using a maximum antenna gain less or equal to than the one shown in the table below, with a minimum distance of 20 cm between the human body and antenna, the product complies with the European Council Recommendation 1999/519/EC on the limitation of exposure of the general public to electromagnetic fields (0 Hz to 300 GHz).

Frequency band Antenna gain

GSM 900 5.46 dBi

PCS 1800 11.34 dBi

This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

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FCC/IC Regulatory notices

Modification statement

Telit has not approved any changes or modifications to this device by the user. Any changes or modifications could void the user’s authority to operate the equipment.

Telit n’approuve aucune modification apportée à l’appareil par l’utilisateur, quelle qu’en soit la nature. Tout changement ou modification peuvent annuler le droit d’utilisation de l’appareil par l’utilisateur.

Interference statement

This device complies with Part 15 of the FCC Rules and Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Wireless notice

This equipment complies with FCC and IC radiation exposure limits set forth for an uncontrolled environment. The antenna should be installed and operated with minimum distance of 20 cm between the radiator and your body. Antenna gain must be below:

Frequency band Antenna gain

GSM 850 6.42 dBi

PCS 1900 1.99 dBi

This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

Cet appareil est conforme aux limites d'exposition aux rayonnements de la IC pour un environnement non contrôlé. L'antenne doit être installé de façon à garder une distance minimale de 20 centimètres entre la source de rayonnements et votre corps. Gain de l'antenne doit être ci-dessous:

Bande de fréquence Gain de l'antenne

GSM 850 6.42 dBi

PCS 1900 1.99 dBi

L'émetteur ne doit pas être colocalisé ni fonctionner conjointement avec à autre antenne ou autre émetteur.

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FCC Class B digital device notice

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the receiver

is connected.

- Consult the dealer or an experienced radio/TV technician for help.

Labelling Requirements for the Host device

The host device shall be properly labelled to identify the modules within the host device. The certification label of the module shall be clearly visible at all times when installed in the host device, otherwise the host device must be labelled to display the FCC ID and IC of the module, preceded by the words "Contains transmitter module", or the word "Contains", or similar wording expressing the same meaning, as follows:

Contains FCC ID: RI7GE866 Contains IC: 5131A-GE866

L'appareil hôte doit être étiqueté comme il faut pour permettre l'identification des modules qui s'y trouvent. L'étiquette de certification du module donné doit être posée sur l'appareil hôte à un endroit bien en vue en tout temps. En l'absence d'étiquette, l'appareil hôte doit porter une étiquette donnant le FCC ID et le IC du module, précédé des mots « Contient un module d'émission », du mot « Contient » ou d'une formulation similaire exprimant le même sens, comme suit :

Contient FCC ID: RI7GE866 Contient IC: 5131A-GE866

CAN ICES-3 (B) / NMB-3 (B)

This Class B digital apparatus complies with Canadian ICES-003.

Cet appareil numérique de classe B est conforme à la norme canadienne ICES-003.

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16. Safety Recommendations

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://ec.europa.eu/enterprise/sectors/rtte/documents/

The text of the Directive 99/05 regarding telecommunication equipments is available, while the applicable Directives (Low Voltage and EMC) are available at:

http://ec.europa.eu/enterprise/sectors/electrical/

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17. Document History

Revision Date Changes

Rev. 0 2013-10-02 First issue Rev. 1 2014-02-07 Updated VRTC voltage, power consumption and packing

system

Rev.2 2014-03-03 Added par.15

GE866-DUAL Hardware User Guide

1VV0301051 Rev. 2 – 2014-04-077

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Telit Wireless Solutions GE866-QUAD Hardware User's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual