Telit Communications S p A GE910Q3 Quad Band GSM/GPRS module User Manual 1vv0300962 GE910 Hardware User Guide r12

Telit Communications S.p.A. Quad Band GSM/GPRS module 1vv0300962 GE910 Hardware User Guide r12

Contents

Users Manual

GE910 Hardware User Guide 1vv0300962 Rev.12 – 2013-10-22
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 2 of 83 Mod. 0805 2011-07 Rev.2 APPLICABILITY TABLE PRODUCT GE910-GNSS GE910-QUAD GE910-QUAD V3
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 3 of 83 Mod. 0805 2011-07 Rev.2 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 4 of 83 Mod. 0805 2011-07 Rev.2 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. Copyright © Telit Communications S.p.A. 2013
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 5 of 83 Mod. 0805 2011-07 Rev.2 Contents 1. Introduction ..................................................................................................................................................................... 7 1.1. Scope ........................................................................................................................................................................ 7 1.2. Audience .................................................................................................................................................................. 7 1.3. Contact Information, Support ................................................................................................................................... 7 1.4. Document Organization ........................................................................................................................................... 8 1.5. Text Conventions ..................................................................................................................................................... 9 1.6. Related Documents .................................................................................................................................................. 9 2. Overview ........................................................................................................................................................................ 10 3. GE910 module connections .......................................................................................................................................... 11 3.1. PIN-OUT ................................................................................................................................................................ 11 3.2. Important Pin-out to Debug in customer’s application .......................................................................................... 15 3.3. LGA PADs Layout ................................................................................................................................................. 16 4. Hardware Commands................................................................................................................................................... 17 4.1. Turning ON the GE910 .......................................................................................................................................... 17 4.2. Turning OFF the GE910 ........................................................................................................................................ 21 4.3. HW Unconditional Shutdown on GE910 ............................................................................................................... 23 5. Power Supply ................................................................................................................................................................. 25 5.1. Power Supply Requirements .................................................................................................................................. 25 5.2. Power Consumption ............................................................................................................................................... 26 5.2.1. Power consumption Plots .............................................................................................................................. 27 5.3. General Design Rules ............................................................................................................................................. 31 5.3.1. Electrical Design Guidelines ......................................................................................................................... 31 5.3.2. Thermal Design Guidelines ........................................................................................................................... 34 5.3.3. Power Supply PCB layout Guidelines ........................................................................................................... 35 6. GSM Radio Section ....................................................................................................................................................... 36 6.1. GSM Antenna Requirements ................................................................................................................................. 36 6.2. GSM Antenna - PCB line Guidelines ..................................................................................................................... 37 6.3. PCB Guidelines in case of FCC certification ......................................................................................................... 38 6.3.1. Transmission line design ............................................................................................................................... 38 6.3.2. Transmission line measurements ................................................................................................................... 39 6.4. GSM Antenna - Installation Guidelines ................................................................................................................. 41 7. Global Navigation Satellite System (GE910-GNSS) ................................................................................................... 42 7.1. Principles of operation ........................................................................................................................................... 42 7.2. GNSS Signals Pinout ............................................................................................................................................. 43 7.3. Turning ON/OFF the GNSS module only in standalone mode .............................................................................. 43 7.4. RF Front End Design.............................................................................................................................................. 43 7.4.1. RF Signal Requirements ................................................................................................................................ 44 7.4.2. GNSS Antenna – PCB Line Guidelines ......................................................................................................... 44 7.4.3. GNSS Antenna Polarization .......................................................................................................................... 44 7.4.4. GNSS Antenna Gain ...................................................................................................................................... 45 7.4.5. Active versus Passive Antenna ...................................................................................................................... 45 7.4.6. RF Trace Losses ............................................................................................................................................ 46 7.4.7. Implications of the Pre-select SAW Filter ..................................................................................................... 46 7.4.8. External LNA Gain and Noise Figure ........................................................................................................... 46
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 6 of 83 Mod. 0805 2011-07 Rev.2 7.4.9. Powering the External LNA (active antenna) ................................................................................................ 46 7.4.10. External LNA Enable ..................................................................................................................................... 47 8. Logic Level Specifications ............................................................................................................................................ 48 9. USB Port ........................................................................................................................................................................ 49 9.1. USB 2.0 FS ............................................................................................................................................................ 49 10. Serial Ports ................................................................................................................................................................ 50 10.1. Modem Serial Port ................................................................................................................................................. 50 10.2. RS232 level translation .......................................................................................................................................... 52 11. Audio Section Overview ........................................................................................................................................... 54 11.1. Digital Voice Interface (DVI) ................................................................................................................................ 54 11.1.1. DVI Electrical Connections ........................................................................................................................... 54 11.2. Analog Front-End ................................................................................................................................................... 54 11.2.1. MIC connection ............................................................................................................................................. 54 11.2.2. LINE-IN connection ....................................................................................................................................... 56 11.2.3. EAR connection ............................................................................................................................................. 57 11.2.4. Electrical Characteristics .............................................................................................................................. 59 12. General Purpose I/O ................................................................................................................................................. 61 12.1. Using a GPIO Pad as INPUT ................................................................................................................................. 62 12.2. Using a GPIO Pad as OUTPUT ............................................................................................................................. 62 12.3. Indication of network service availability .............................................................................................................. 63 12.4. RTC Bypass out ..................................................................................................................................................... 64 12.5. External SIM Holder Implementation .................................................................................................................... 64 12.6. ADC Converter ...................................................................................................................................................... 64 12.6.1. Description .................................................................................................................................................... 64 12.6.2. Using ADC Converter ................................................................................................................................... 64 13. Mounting the GE910 on your Board....................................................................................................................... 65 13.1. General ................................................................................................................................................................... 65 13.2. Module finishing & dimensions ............................................................................................................................. 65 13.3. Recommended foot print for the application .......................................................................................................... 66 13.4. Stencil ..................................................................................................................................................................... 67 13.5. PCB pad design ...................................................................................................................................................... 67 13.6. Recommendations for PCB pad dimensions .......................................................................................................... 67 13.7. Solder paste ............................................................................................................................................................ 69 13.7.1. GE910 Solder reflow ..................................................................................................................................... 69 14. Packing system .......................................................................................................................................................... 71 14.1. Packing on Reel ...................................................................................................................................................... 71 14.1.1. Carrier Tape Detail ....................................................................................................................................... 71 14.1.2. Reel Detail ..................................................................................................................................................... 72 14.1.3. Packaging Detail ........................................................................................................................................... 73 14.2. Packing on tray ....................................................................................................................................................... 74 14.3. Moisture sensibility ................................................................................................................................................ 76 15. Conformity Assessment Issues ................................................................................................................................. 77 16. SAFETY RECOMMANDATIONS ......................................................................................................................... 82 17. Document History ..................................................................................................................................................... 83
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 7 of 83 Mod. 0805 2011-07 Rev.2 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 GE910 module. 1.2. Audience This document is intended for Telit customers, who are integrators, about to implement their applications using our GE910 modules. 1.3. Contact Information, Support For general contact, technical support, to report documentation errors and to order manuals, contact Telit’s Technical Support Centre (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-support-center/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’s Technical Support Centre (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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 8 of 83 Mod. 0805 2011-07 Rev.2 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: “GE910 Module Connections” deals with the pin out configuration and layout. Chapter 4: “Hardware Commands” How to operate on the module via hardware. Chapter 5: “Power supply” Power supply requirements and general design rules. Chapter 6: “GSM Radio” The antenna connection and board layout design are the most important parts in the full product design. Chapter 7: “GNSS Receiver” This section describes the GNSS receiver. Chapter 8: “Logic Level specifications” Specific values adopted in the implementation of logic levels for this module. Chapter 9: “USB Port” Describes the USB port and the interface between the module and OEM hardware. Chapter 10: “Serial ports” Describes the UART ports present and the interface between the module and OEM hardware. Chapter 11: “Audio Section overview” Refers to the audio blocks of the Base Band Chip of the GE910 Telit Modules. Chapter 12: “General Purpose I/O” How the general purpose I/O pads can be configured. Chapter 13: “Mounting the GE910 on the application board” Recommendations and specifics on how to mount the module on the user’s board. Chapter 14: “Packing system” Packaging Information. Chapter 15: “Conformity Assessment Issues” Information related to the Conformity Assessments. Chapter 16: “Safety Recommendations” Information related to the Safety topics. Chapter 17: “Document History”
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 9 of 83 Mod. 0805 2011-07 Rev.2 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. All dates are in ISO 8601 format, i.e. YYYY-MM-DD. 1.6. Related Documents • Telit 's GSM/GPRS Family Software User Guide, 1vv0300784 • Audio settings application note , 80000NT10007a • Digital Voice Interface Application Note, 80000NT10004a • GE910 Product description, 80397ST10107A • SIM Holder Design Guides, 80000NT10001a • AT Commands Reference Guide, 80000ST10025a • Telit EVK2 User Guide, 1vv0300704
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 10 of 83 Mod. 0805 2011-07 Rev.2 2. Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE910 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 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 GE910 module. For further hardware details that may not be explained in this document refer to the Telit GE910 Product Description document where all the hardware information is reported. NOTICE: (The integration of the GSM/GPRS GE910 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 11 of 83 Mod. 0805 2011-07 Rev.2 3. GE910 module connections 3.1. PIN-OUT PAD Signal I/O Function Type COMMENT USB 2.0 COMMUNICATION PORT B15 USB_D+ I/O USB differential Data (+) 3.3V Reserved on GE910-QUAD V3 C15 USB_D- I/O USB differential Data (-) 3.3V Reserved on GE910-QUAD V3 A13 VUSB AI Power sense for USB presence 5V Accepted range 1.8V to 5V Reserved on GE910-QUAD V3 Asynchronous UART1 – Program / Data + HW Flow Control N15 C103/TXD I Serial data input from DTE CMOS 1.8V UART1 M15 C104/RXD O Serial data output to DTE CMOS 1.8V UART1 M14 C108/DTR I Input for (DTR) from DTE CMOS 1.8V L14 C105/RTS I Input for Request to send signal (RTS) from DTE CMOS 1.8V P15 C106/CTS O Output for Clear to Send signal (CTS) to DTE CMOS 1.8V N14 C109/DCD O Output for (DCD) to DTE CMOS 1.8V P14 C107/DSR O Output for (DSR) to DTE CMOS 1.8V R14 C125/RING O Output for Ring (RI) to DTE CMOS 1.8V Asynchronous Auxiliary UART2 D15 TX_AUX O Auxiliary UART (TX Data to DTE) CMOS 1.8V UART2 E15 RX_AUX I Auxiliary UART (RX Data from DTE) CMOS 1.8V UART2 SIM card interface A6 SIMCLK O External SIM signal – Clock 1.8 / 3V A7 SIMRST O External SIM signal – Reset 1.8 / 3V A5 SIMIO I/O External SIM signal – Data I/O 1.8 / 3V A4 SIMIN I External SIM signal – Presence (active low) CMOS 1.8 A3 SIMVCC - External SIM signal – Power supply for the SIM 1.8 / 3V Analog Voice Interface B2 EAR+ AO Ear signal output, phase + B3 EAR- AO Ear signal output, phase - B4 MIC+ AI Microphone signal input; phase + B5 MIC- AI Microphone signal input; phase - Digital Voice Interface (DVI) B9 DVI_WA0 I/O Digital Audio Interface (WA0) CMOS 1.8V B6 DVI_RX I/O Digital Audio Interface (RX) CMOS 1.8V B7 DVI_TX I/O Digital Audio Interface (TX) CMOS 1.8V B8 DVI_CLK I/O Digital Audio Interface (CLK) CMOS 1.8V ADC B1 ADC_IN1 AI Analog to Digital converter input A/D Values 0 to 1.3V 0 to 1.2V on GE910-QUAD V3 DIGITAL IO
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 12 of 83 Mod. 0805 2011-07 Rev.2 C8 GPIO_01 I/O GPIO_01 / STAT_LED CMOS 1.8V Alternate Function STATUS LED C9 GPIO_02 I/O GPIO_02 CMOS 1.8V C10 GPIO_03 I/O GPIO_03 CMOS 1.8V C11 GPIO_04 I/O GPIO_04 CMOS 1.8V B14 GPIO_05 I/O GPIO_05 / RFTXMON CMOS 1.8V Alternate Function RFTXMON C12 GPIO_06 I/O GPIO_06 CMOS 1.8V C13 GPIO_07 I/O GPIO_07 CMOS 1.8V K15 GPIO_08 I/O GPIO_08 CMOS 1.8V L15 GPIO_09 I/O GPIO_09 CMOS 1.8V G15 GPIO_10 I/O GPIO_10 CMOS 1.8V RF SECTION GSM K1 ANTENNA GSM - GSM/GPRS Antenna (50 ohm) RF GNSS SECTION R9 ANTENNA GNSS - GNSS Antenna (50 ohm) RF Reserved on GE910-QUAD V3 G14 GNSS_EN* I External GNSS ON-OFF VBATT ref. Open Colector active low Reserved on GE910-QUAD V3 J14 GNSS_NMEA_TX O UART NMEA Output 1.8V UART3 or GNSS_BOOT Reserved on GE910-QUAD V3 K14 GNSS_NMEA_RX I UART NMEA Input 1.8V UART3 Reserved on GE910-QUAD V3 R7 GNSS_LNA_EN O GNSS External LNA Enable 1.8V Active Antenna Control Reserved on GE910-QUAD V3 MISCELLANEOUS FUNCTIONS R13 HW_SHUTDOWN* I HW Unconditional Shutdown VBATT ref. Open Colector active low R12 ON_OFF* I Input command for power ON VRTC 2,3V ref. Open Colector active low C14 VRTC I VRTC Backup capacitor RTC Power Backup for the embedded RTC supply, don’t connect to VBATT! R11 VAUX/PWRMON O Supply Output for external accessories / Power ON Monitor 1.8V POWER SUPPLY M1 VBATT - Main power supply (Baseband) Power M2 VBATT - Main power supply (Baseband) Power N1 VBATT_PA - Main power supply (Radio PA) Power N2 VBATT_PA - Main power supply (Radio PA) Power P1 VBATT_PA - Main power supply (Radio PA) Power P2 VBATT_PA - Main power supply (Radio PA) Power E1 GND - Ground Power G1 GND - Ground Power H1 GND - Ground Power J1 GND - Ground Power L1 GND - Ground Power A2 GND - Ground Power E2 GND - Ground Power F2 GND - Ground Power G2 GND - Ground Power
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 13 of 83 Mod. 0805 2011-07 Rev.2 H2 GND - Ground Power J2 GND - Ground Power K2 GND - Ground Power L2 GND - Ground Power R2 GND - Ground Power M3 GND - Ground Power N3 GND - Ground Power P3 GND - Ground Power R3 GND - Ground Power M4 GND - Ground Power N4 GND - Ground Power P4 GND - Ground Power R4 GND - Ground Power N5 GND - Ground Power P5 GND - Ground Power R5 GND - Ground Power N6 GND - Ground Power P6 GND - Ground Power R6 GND - Ground Power P8 GND - Ground Power R8 GND - Ground Power P9 GND - Ground Power P10 GND - Ground Power R10 GND - Ground Power M12 GND - Ground Power B13 GND - Ground Power P13 GND - Ground Power E14 GND - Ground Power RESERVED C1 RESERVED - RESERVED P7 RESERVED - RESERVED D1 RESERVED - RESERVED C2 RESERVED - RESERVED D2 RESERVED - RESERVED C3 RESERVED - RESERVED D3 RESERVED - RESERVED E3 RESERVED - RESERVED F3 RESERVED - RESERVED G3 RESERVED - RESERVED H3 RESERVED - RESERVED J3 RESERVED - RESERVED K3 RESERVED - RESERVED
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 14 of 83 Mod. 0805 2011-07 Rev.2 L3 RESERVED - RESERVED C4 RESERVED - RESERVED C5 RESERVED - RESERVED C6 RESERVED - RESERVED C7 RESERVED - RESERVED N7 RESERVED - RESERVED N8 RESERVED - RESERVED N9 RESERVED - RESERVED A10 RESERVED - RESERVED N10 RESERVED - RESERVED N11 RESERVED - RESERVED B12 RESERVED - RESERVED D12 RESERVED - RESERVED N12 RESERVED - RESERVED P12 RESERVED - RESERVED F14 RESERVED - RESERVED H14 RESERVED - RESERVED N13 RESERVED - RESERVED L13 RESERVED - RESERVED J13 RESERVED - RESERVED M13 RESERVED - RESERVED K13 RESERVED - RESERVED H13 RESERVED - RESERVED G13 RESERVED - RESERVED F13 RESERVED - RESERVED A11 RESERVED - RESERVED A12 RESERVED - RESERVED B11 RESERVED - RESERVED B10 RESERVED - RESERVED A9 RESERVED - RESERVED A8 RESERVED - RESERVED A14 RESERVED - RESERVED D13 RESERVED - RESERVED D14 RESERVED - RESERVED H15 RESERVED - RESERVED J15 RESERVED - RESERVED F1 RESERVED - RESERVED D4 RESERVED - RESERVED E13 RESERVED - RESERVED F15 RESERVED - RESERVED P11 RESERVED - RESERVED
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 15 of 83 Mod. 0805 2011-07 Rev.2 WARNING: Reserved pins must not be connected. 3.2. Important Pin-out to Debug in customer’s application The followings pins are necessary to debug the application when the module is assembled on customer’s application. We recommend connecting them also to dedicated test point. PADs for GE910 Signal M1,M2,N1,N2,P1,P2 VBATT & VBATT_PA E1,G1,H1,J1,L1,A2,E2,F2,G2,H2, J2,K2,L2,R2,M3,N3,P3,R3,M4, N4,P4,R4,N5,P5,R5,N6,P6,R6,P8, R8,P9,P10,R10,M12,B13,P13,E14 GND R12 ON/OFF* R13 HW_SHUTDOWN* K1 ANTENNA GSM B15 (RESERVED on GE910-QUAD V3) USB_D+ C15 (RESERVED on GE910-QUAD V3) USB_D- N15 C103/TXD M15 C104/RXD L14 C105/RTS P15 C106/CTS D15 TXD_AUX E15 RXD_AUX ADDITIONAL PADs for GE910-GNSS only Signal R9 ANTENNA GNSS G14 GNSS_EN* J14 GNSS_NMEA_TX K14 GNSS_NMEA_RX NOTE: Not used pins apart from table above can be left unconnected. RTS pin should be connected to the GND (on the module side) if flow control is not used.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 16 of 83 Mod. 0805 2011-07 Rev.2 3.3. LGA PADs Layout TOP VIEW A B C D E F G H J K L M N P R 1 ADC IN1 RES RES GND RES GND GND GND ANT_GSM GND VBATT VBATT_PA VBATT_PA 2 GND EAR+ RES RES GND GND GND GND GND GND GND VBATT VBATT_PA VBATT_PA GND 3 SIMVCC EAR- RES RES RES RES RES RES RES RES RES GND GND GND GND 4 SIMIN MIC+ RES RES GND GND GND GND 5 SIMIO MIC- RES GND GND GND 6 SIMCLK DVI_RX RES GND GND GND 7 SIMRST DVI_TX RES RES RES GNSS _LNA_EN 8 RES DVI_CLK GPIO_01 RES GND GND 9 RES DVI_WA0 GPIO_02 RES GND ANT_GNSS 10 RES RES GPIO_03 RES GND GND 11 RES RES GPIO_04 RES RES VAUX / PWRMON 12 RES RES GPIO_06 RES GND RES RES ON_OFF* 13 USB _VBUS GND GPIO_07 RES RES RES RES RES RES RES RES RES RES GND HW_SHUTDOWN* 14 RES GPIO_05 VRTC RES GND RES GNSS_EN* RES GNSS _NMEA_TX GNSS _NMEA_RX C105/RTS C108/DTR C109/DCD C107/DSR C125/RING 15 USB_D+ USB_D- TX AUX RX AUX RES GPIO_10 RES RES GPIO_08 GPIO_09 C104/RXD C103/TXD C106/CTS NOTE: The pin defined as RES has to be considered RESERVED and not connected on any pin in the application. The related area on the application has to be kept empty. Pin G14; J14; K14; R7; R9 are available only on GE910-GNSS variant. Pin B15; C15; A13 are NOT available on GE910-QUAD V3 variant
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 17 of 83 Mod. 0805 2011-07 Rev.2 4. Hardware Commands 4.1. Turning ON the GE910 To turn on the GE910 the pad ON-OFF* must be tied low for at least 5 seconds and then released. The maximum current that can be drained from the ON-OFF* pad is 0.2mA. 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 GE910 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”*" or with a bar over the name. TIP: To check if the device has powered on, the hardware line PWRMON should be monitored. The device is powered on when PWRMON goes high. NOTE: It is mandatory to avoid sending data to the serial ports during the first 200ms of the module start-up.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 18 of 83 Mod. 0805 2011-07 Rev.2 The flow chart showing the proper TURN ON procedure is displayed below: 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 GE910 when the module is powered off or during an ON/OFF transition. MODEM ON Proc. Y N HW unconditional SHUTDOWN Y PWMON HIGH? PWMON HIGH? N ON_OFF = LOW WAIT > 5 Sec ON_OFF = Z Start AT CMD. WAIT > 1 Sec
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 19 of 83 Mod. 0805 2011-07 Rev.2 The Flow chart showing the AT commands managing procedure is displayed below: NOTE: Do not give any commands before 300 msec after ON/OFF procedure. AT init sequence. AT answer ‘OK’ into 1 sec ? N DELAY > 300msec Enter AT<CR> Start AT CMD. HW unconditional SHUTDOWN Y MODEM ON Proc.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 20 of 83 Mod. 0805 2011-07 Rev.2 ON-OFF Circuit Examples: 1- If your system does not have Open Collector bus, use this interface: 2- Using a simple ON/OFF external switch:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 21 of 83 Mod. 0805 2011-07 Rev.2 4.2. Turning OFF the GE910 Turning OFF of the device can be done in two ways: • via AT command (see GE910 Software User Guide, AT#SHDN) • by tying low pin ON_OFF* for at least 2s Either ways, the device issues a detach request to network informing that the device will not be reachable any more. To turn OFF the GE910 the pad ON-OFF* must be tied low for at least 2 seconds and then released. The same circuitry and timing for the power on must be used. The device shuts down after the release of the ON-OFF* pad. TIP: To check if the device has been powered off, the hardware line PWRMON must be monitored. The device is powered off when PWRMON goes low. 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 GE910 when the module is powered off or during an ON/OFF transition.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 22 of 83 Mod. 0805 2011-07 Rev.2 The following flow chart shows the proper HW TURN OFF procedure: N Y HW unconditional SHUTDOWN N PWMON HIGH? PWMON HIGH? Y ON_OFF = LOW WAIT > 2s ON_OFF = Z MODEM OFF Proc. MODEM ON Proc. WAIT > 15s WAIT > 1 Sec
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 23 of 83 Mod. 0805 2011-07 Rev.2 4.3. HW Unconditional Shutdown on GE910 WARNING: The hardware unconditional Shutdown 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 stacked waiting for some network or SIM responses. To unconditionally Shutdown the GE910, the pad HW_SHUTDOWN* must be tied low for at least 200 milliseconds and then released. After this operation the module is in OFF condition. The maximum current that can be drained from the HW_SHUTDOWN* pad is 0,4 mA. NOTE: Do not use any pull up resistor on the HW_SHUTDOWN* line or any totem pole digital output. Using pull up resistor may bring to latch up problems on the GE910 power regulator and improper functioning of the module. The line HW_SHUTDOWN* must be connected only in open collector configuration, since it is already internally pull-up to VBATT. TIP: The unconditional hardware shutdown 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:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 24 of 83 Mod. 0805 2011-07 Rev.2 In the following flow chart is detailed the proper HW restart procedure: 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 GE910 when the module is powered off or during an ON/OFF transition. HW unconditional SHUTDOWN HW SHUTDOWN* = LOW Delay > 200ms HW SHUTDOWN* = Z PWRMON = HIGH Modem ON Proc. N Y Disconnect PWR supply
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 25 of 83 Mod. 0805 2011-07 Rev.2 5. 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. 5.1. Power Supply Requirements The external power supply must be connected to VBATT & VBATT_PA signals and must fulfill the following requirements: POWER SUPPLY Nominal Supply Voltage 3.8 V Normal Operating Voltage Range 3.40 V÷ 4.20 V Extended Operating Voltage Range 3.20 V÷ 4.50 V NOTE: The Operating Voltage Range MUST never be exceeded; care must be taken in order to fulfil min/max voltage requirement. 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 completely assumption and application of the HW User guide suggestions.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 26 of 83 Mod. 0805 2011-07 Rev.2 5.2. Power Consumption The GE910 power consumptions are: GE910 Mode Average (mA) @3.8V Mode description GSM+GNSS SWITCHED OFF Module supplied but Switched Off Switched Off 100uA GSM mode only IDLE mode AT+CFUN=1 21 Normal mode: full functionality of the module AT+CFUN=4 18 Disabled TX and RX; module is not registered on the network AT+CFUN=0 or =5 3,8 Paging Multiframe 2 2,5 Paging Multiframe 3 2,4 Paging Multiframe 4 1,2 Paging Multiframe 9 VOICE TX and RX mode GSM VOICE CALL GSM900 VOICE PL5 230 DCS1800 VOICE PL0 175 GPRS (class 1) 1TX + 1RX GPRS Sending data mode GSM900 PL5 225 DCS1800 PL0 160 GPRS (class 10) 2TX + 3RX GPRS Sending data mode GSM900 PL5 360 DCS1800 PL0 290 GNSS mode only Tracking GPS 55 Tracking GNSS 65 Acquisition (GNSS) 98 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, and 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. NOTE: 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 27 of 83 Mod. 0805 2011-07 Rev.2 5.2.1. Power consumption Plots This document section is showing the typical Current consumption plots (using Agilent 66319D) in the normal working conditions of the module. GSM900 – Voice Call – Power level 5
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 28 of 83 Mod. 0805 2011-07 Rev.2 GSM900 – GPRS Call – Power level 5 - 1 Slot TX GSM900 – GPRS Call – Power level 5 - 2 Slot TX, 3 Slot RX
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 29 of 83 Mod. 0805 2011-07 Rev.2 DCS1800 – Voice Call – Power level 0 DCS1800 – GPRS Call – Power level 0 – 1 Slot TX
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 30 of 83 Mod. 0805 2011-07 Rev.2 PCS1900 – GPRS Call – Power level 0 - 2 Slot TX, 3 Slot RX
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 31 of 83 Mod. 0805 2011-07 Rev.2 5.3. 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 5.3.1. 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 5.3.1.1. + 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 GE910, a 100F 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 GE910 from power polarity inversion. An example of linear regulator with 5V input is:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 32 of 83 Mod. 0805 2011-07 Rev.2 5.3.1.2. + 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 GE910. • 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 100F 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 GE910 from power polarity inversion. This can be the same diode as for spike protection. An example of switching regulator with 12V input is in the below schematic:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 33 of 83 Mod. 0805 2011-07 Rev.2 5.3.1.3. 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 GE910 module. WARNING: 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 GE910 and damage it. NOTE: DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GE910. Their use can lead to overvoltage on the GE910 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 100F 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 GE910 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 34 of 83 Mod. 0805 2011-07 Rev.2 5.3.2. Thermal Design Guidelines The thermal design for the power supply heat sink should be done with the following specifications: See section 6.2 Power Consumption 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. For the heat generated by the GE910, you can consider it to be during transmission 1W max during VOICE calls and 2W max during class10 GPRS upload. This generated heat will be mostly conducted to the ground plane under the GE910; you must ensure that your application can dissipate it. 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 35 of 83 Mod. 0805 2011-07 Rev.2 5.3.3. 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 performances. • The Bypass low ESR capacitor must be placed close to the Telit GE910 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 GE910 is wide enough to ensure a drop less 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 GE910, then this noise is not so disturbing and power supply layout design can be more forgiving. • The PCB traces to the GE910 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 36 of 83 Mod. 0805 2011-07 Rev.2 6. GSM Radio Section The antenna connection and board layout design are the most important aspect in the full product design as they strongly affect the product overall performances, hence read carefully and follow the requirements and the guidelines for a proper design. 6.1. GSM Antenna Requirements As suggested on the Product Description the antenna and antenna transmission line on PCB for a Telit GE910 device shall fulfill the following requirements: ANTENNA REQUIREMENTS Frequency range Depending by frequency band(s) provided by the network operator, the customer shall use the most suitable antenna for that/those band(s) Bandwidth 70 MHz in GSM850, 80 MHz in GSM900, 170 MHz in DCS & 140 MHz PCS band Impedance 50 Input power > 2 W VSWR absolute max  10:1 (limit to avoid permanent damage) VSWR recommended  2:1 (limit to fulfill all regulatory requirements) When using the GE910, since there's no antenna connector on the module, the antenna must be connected to the GE910 antenna pad (LGA pad K1) by means of a transmission line implemented on the PCB. In the case the antenna is not directly connected at the antenna pad of the GE910, 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 Characteristic Impedance 50 Max Attenuation 0,3 dB Coupling with other signals shall be avoided Cold End (Ground Plane) of antenna shall be equipotential to the GE910 ground pins
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 37 of 83 Mod. 0805 2011-07 Rev.2 Furthermore if the device is developed for the US market and/or Canada market, it shall comply with the FCC and/or IC approval requirements. This device is to be used only for mobile and fixed application. In order to re-use the Telit FCC/IC approvals 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. See chapter 15.Conformity Assessment Issues 6.2. GSM Antenna - PCB line Guidelines • Make sure that the transmission line’s characteristic impedance is 50 ; • Keep line on the PCB as short as possible, since the antenna line loss shall be less than around 0,3 dB; • Line geometry should have uniform characteristics, constant cross section, avoid meanders and abrupt curves; • Any kind of suitable geometry / structure (Microstrip, Stripline, Coplanar, Grounded Coplanar Waveguide...) can be used for implementing the printed transmission line afferent the antenna; • If a Ground plane is required in line geometry, that plane has to be continuous and sufficiently extended, so the geometry can be as similar as possible to the related canonical model; • Keep, if possible, at least one layer of the PCB used only for the Ground plane; If possible, use this layer as reference Ground plane for the transmission line; • It is wise to surround (on both sides) the PCB transmission line with Ground, avoid having other signal tracks facing directly the antenna line track. • Avoid crossing any un-shielded transmission line footprint with other signal tracks on different layers; • The ground surrounding the antenna line on PCB has to be strictly connected to the main Ground Plane by means of via holes (once per 2mm at least), placed close to the ground edges facing line track; • Place EM noisy devices as far as possible from GE910 antenna line; • Keep the antenna line far away from the GE910 power supply lines; • If EM noisy devices are present on the PCB hosting the GE910, 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 EM noisy devices are not present around the line, the use of geometries like Microstrip or Grounded Coplanar Waveguide has to be preferred, since they typically ensure less attenuation if compared to a Stripline having same length;
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 38 of 83 Mod. 0805 2011-07 Rev.2 6.3. PCB Guidelines in case of FCC certification In the case FCC certification is required for an application using GE910, according to FCC KDB 996369 for modular approval requirements, the transmission line has to be similar to that implemented on GE910 interface board and described in the following chapter. 6.3.1. Transmission line design During the design of the GE910 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. The interface board is realized on a FR4, 4-layers PCB. Substrate material is characterized by relative permittivity r = 4.6 ± 0.4 @ 1 GHz, TanD= 0.019 ÷ 0.026 @ 1 GHz. A characteristic impedance of nearly 50  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 , estimated line loss is less than 0.1 dB. The line geometry is shown below:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 39 of 83 Mod. 0805 2011-07 Rev.2 6.3.2. 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 GE910 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  load. Return Loss plot of line under test is shown below:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 40 of 83 Mod. 0805 2011-07 Rev.2 Line input impedance (in Smith Chart format, once the line has been terminated to 50  load) is shown in the following figure: Insertion Loss of G-CPW line plus SMA connector is shown below:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 41 of 83 Mod. 0805 2011-07 Rev.2 6.4. GSM Antenna - Installation Guidelines • Install the antenna in a place covered by the GSM signal. • If the device antenna is located greater then 20cm from the human body and there are no co-located transmitter then the Telit FCC/IC approvals can be re-used by the end product • If the device antenna is located less then 20cm from the human body or there are no co-located transmitter then the additional FCC/IC testing may be required for the end product (Telit FCC/IC approvals cannot be reused) • Antenna shall not be installed inside metal cases • Antenna shall be installed also according Antenna manufacturer instructions.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 42 of 83 Mod. 0805 2011-07 Rev.2 7. Global Navigation Satellite System (GE910-GNSS) The GNSS part of GE910-GNSS module is a new age of receiver that can simultaneously search and track satellite signals from multiple satellite constellations. This multi-GNSS receiver uses the entire spectrum of GNSS systems available: GPS, Glonass, Galileo and QZSS. It features advanced real time hardware correlation engine for enhanced sensitivity navigation engine (PVT), Fast Acquisition giving rapid Time-to-First-Fix (TTFF), low power consumption and fast time to first fix, 32 track verification channels, stand Alone and Assisted mode and Satellite Based Augmentation Systems (SBAS): WAAS, EGNOS, and MSAS. It also offers an accurate timing pulse and jamming immunity. Operation in a high interference signal environment is common practice in today’s electronic age. By incorporating 3-stage rejection architecture, it is able to remove interfering signals pre- and post-correlation. With the help of advanced digital signal processing algorithms and the use of A-GPS data, the receiver is capable to achieve higher sensitivity values required for indoor applications. The following table is listing the GE910 variants that support the GNSS receiver: Product GNSS Receiver GE910-GNSS YES GE910-QUAD NO GE910-QUAD V3 NO NOTE: The GNSS part of GE910-GNSS module has the same electrical and performance specifications as referred in Telit “SL869 Product Description”. Please refer to that document for more detail information. 7.1. Principles of operation The GSM and GNSS part of the module can be used in two ways: standalone or hosted. In the standalone mode the GE910-GNSS module has independent Power ON-OFF and UART. In the hosted mode the GNSS is controlled by GSM at start-up, left GNSS_EN* pad unconnected. In this mode the GNSS commands and NMEA strings can be either through the dedicated GNSS UART3 or via GSM UARTs, leaving UART3 for different use. The GNSS firmware is upgradable as standalone or host, in host operation, leave GNSS_BOOT (GNSS_NMEA_TX) pin floating. In Standalone mode of operation place into BOOT mode by tying GNSS_BOOT pin to Ground through a 1K pull-up resistor. The host serial I/O port of the receiver’s serial data interface supports full duplex communication between the receiver and the user. The default serial configuration on UART3 (GNSS_NMEA_UART) is as follows: NMEA, 115200 bps, 8 data bits, no parity, and 1stop bit.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 43 of 83 Mod. 0805 2011-07 Rev.2 7.2. GNSS Signals Pinout GNSS SECTION R9 ANTENNA GNSS - GNSS Antenna (50 ohm) RF G14 GNSS_EN* I External GNSS ON-OFF VBATT ref. Open Colector active low J14 GNSS_NMEA_TX O UART NMEA Output 1.8V UART3 or GNSS_BOOT K14 GNSS_NMEA_RX I UART NMEA Input 1.8V UART3 R7 GNSS_LNA_EN O GNSS External LNA Enable 1.8V Active Antenna Control 7.3. Turning ON/OFF the GNSS module only in standalone mode Turning ON/OFF the GNSS device can be done in two ways: • via AT command (see GE910 Software User Guide, AT$GPSP) • Keeping low the external pad GNSS_EN* to Power On or releasing it to Power OFF. NOTE: Connect GNSS_EN* pad in an open collector configuration, since it is pulled-up to VBATT. TIP: To check if the GNSS device has powered on, you can use the GNSS_LNA_EN, it goes high on power-on until first fix, and only then, it may pulse for power saving requirements. 7.4. RF Front End Design The GE910 Module contains an integrated LNA and pre-select SAW filter. This allows the module to work properly with a passive GPS antenna. If the antenna cannot be located near the GE910, then an active antenna (i.e. an antenna with a built-in low noise amplifier) can be used.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 44 of 83 Mod. 0805 2011-07 Rev.2 7.4.1. RF Signal Requirements Thanks to the internal LNA it amplifies the GNSS signals and provides enough gain for the receiver to use a passive antenna. A very low noise design is utilized to provide maximum sensitivity. For better performance the system requires an external BIAS-T and antenna voltage supply for active antenna. 7.4.2. GNSS Antenna – PCB Line Guidelines • Ensure that the antenna line impedance is 50ohm. • Keep the antenna line on the PCB as short as possible to reduce the loss. • Antenna line must have uniform characteristics, constant cross section, avoid meanders and abrupt curves. • Keep one layer of the PCB used only for the Ground plane, if possible. • Surround (on both the sides, over and under) the antenna line on PCB with Ground, avoid having other signal tracks facing directly the antenna line of track. • The ground around the antenna line on PCB has to be strictly connected to the Ground Plane by placing vias once per 2mm at least. • Place EM noisy devices as far as possible from antenna line. • Keep the antenna line far away from power supply lines. • Keep the antenna line far away from GSM RF lines. • If you have EM noisy devices around the PCB hosting the module, 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 do not have EM noisy devices around the PCB hosting the module, use a strip-line on the superficial copper layer for the antenna line. The line attenuation will be lower than a buried one. 7.4.3. GNSS Antenna Polarization The GNSS signal as broadcast is a right hand circularly polarized signal. The best antenna to receive these signals is a right hand circularly (RHCP) polarized antenna. Remember that IS-GPS-200E specifies the received power level with a linearly polarized antenna. A linearly polarized antenna will have 3 dB losses as compared to an RHCP antenna assuming the same antenna gain (specified in dBi and dBic respectively). An RHCP antenna is better at rejecting multipath than a linearly polarized antenna. This is because the reflected signal changes polarization to LHCP, which would be rejected by the RHCP antenna by typically 20 dB or so. If the multipath signal is attenuating the line of sight signal, then the RHCP antenna would show a higher signal level than a linearly polarized antenna because the interfering signal is rejected. However, in the case where the multipath signal is replacing the line of sight signal, such as in an urban canyon environment, then the number of satellites in view could drop below the needed number to determine a 3D solution. This is a case where a bad signal may be better than no signal. The system designer needs to make tradeoffs in his application to choose the better solution.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 45 of 83 Mod. 0805 2011-07 Rev.2 7.4.4. GNSS Antenna Gain Antenna gain is defined as the extra signal power from the antenna as compared to a theoretical isotropic antenna (equally sensitive in all directions). For example, a 25x25mm2 patch antenna on a reference ground plane (usually 70x70mm2) will give an antenna gain at zenith of 5 dBic. A smaller 18mm by 18mm square patch on a reference ground plane (usually 50x50mm2) will give an antenna gain at zenith of 2 dBic. While an antenna vendor will specify a nominal antenna gain (usually at zenith, or directly overhead) antenna pattern curves should be supplied, specifying gain as a function of elevation and gain at a fixed elevation as a function of azimuth. Pay careful attention to the requirement to meet these specifications, such as required ground plane and any external matching components. Failure to follow these requirements could result in very poor antenna performance. It is important to note that GPS antenna gain is not the same thing as external LNA gain. Most antenna vendors will specify these numbers separately, but some combine them into a single number. It is important to know both numbers when designing and evaluating the front end of a GPS receiver. For example, antenna X has an antenna gain of 5 dBiC at azimuth and an LNA gain of 20 dB for a combined total of 25 dB. Antenna Y has an antenna gain of -5 dBiC at azimuth and an LNA gain of 30 dB for a combined total of 25 dB. However, in the system, antenna X will outperform antenna Y by about 10 dB (refer to next chapter for more details on system noise floor). An antenna with higher gain will generally outperform an antenna with lower gain. Once the signals are above about -130 dBm for a particular satellite, no improvement in performance would be gained. However, for those satellites that are below about -125 dBm, a higher gain antenna would improve the gain and improve the performance of the GPS receiver. In the case of really weak signals, a good antenna could make the difference between being able to use a particular satellite signal or not. 7.4.5. Active versus Passive Antenna If the GPS antenna is placed near the GE910 and the RF traces losses are not excessive (nominally 1 dB), then a passive antenna can be used. This would normally be the lowest cost option and most of the time the simplest to use. However, if the antenna needs to be located away from the GE910 then an active antenna may be required to obtain the best system performance. The active antenna has its own built-in low noise amplifier to overcome RF trace or cable losses after the active antenna. However, an active antenna has a low noise amplifier (LNA) with associated gain and noise figure. In addition, many active antennas have a pre-select filter, a post-select filter, or both.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 46 of 83 Mod. 0805 2011-07 Rev.2 7.4.6. RF Trace Losses RF Trace losses are difficult to estimate on a PCB without having the appropriate tables or RF simulation software to estimate what the losses would be. A good rule of thumb would be to keep the RF traces as short as possible, make sure they are 50 ohms impedance and don’t contain any sharp bends. 7.4.7. Implications of the Pre-select SAW Filter The module GE910-GNSS contains a SAW filter used in a pre-select configuration with the built-in LNA, that is, the RF input of the module ties directly into the SAW filter. Any circuit connected to the input of the module would see complex impedance presented by the SAW filter, particularly out of band, rather than the relatively broad and flat return loss presented by the LNA. Filter devices pass the desired in band signal to the output, resulting in low reflected energy (good return loss), and reject the out of band signal by reflecting it back to the input, resulting in high reflected energy (bad return loss). If an external amplifier is used with the module, the overall design should be checked for RF stability to prevent the external amplifier from oscillating. Amplifiers that are unconditionally stable at the output will be fine to use with the module. 7.4.8. External LNA Gain and Noise Figure The module GE910-GNSS can be used with an external LNA such as what might be found in an active antenna. Because of the internal LNA, the overall gain (including signal losses past the external LNA) should not exceed 14 dB. Higher levels can affect the jamming detection capability of the module. If a higher gain LNA is used, either a resistive Pi or T attenuator can be inserted after the LNA to bring the gain down to 14 dB. The external LNA should have a noise figure better than 1 dB. This will give an overall system noise figure of around 2 dB assuming the LNA gain is 14 dB, or if higher the low gain mode is automatically managed with its internal AGC. The external LNA, if having no pre-select filter, needs to be able to handle signals other than the GNSS signal. These signals are typically at much higher levels. The amplifier needs to stay in the linear region when presented with these other signals. Again, the system designer needs to determine all of the unintended signals and their possible levels that can be presented and make sure the external LNA will not be driven into compression. If this were to happen, the GNSS signal itself would start to be attenuated and the performance would suffer. 7.4.9. Powering the External LNA (active antenna) The external LNA needs a source of power. Many of the active antennas accept a 3 volt or 5 volt DC voltage that is impressed upon the RF signal line. This voltage is not supplied by the GE910-GNSS module, but can be easily supplied by the host design.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 47 of 83 Mod. 0805 2011-07 Rev.2 7.4.10. External LNA Enable The GE910 is already provided by an internal LNA. In case the Application needs to include an additional LNA stage, the module is provided by a digital signal usable to enable the power supply of the external amplifier. The signal is set to High only when the GPS receiver is active. The electrical characteristics of the GPS_LNA_EN signal are: Level Min [V] Max [V] Output High Level 1.6 1.9 Output Low Level 0V 0.2 Example of external antenna bias circuitry:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 48 of 83 Mod. 0805 2011-07 Rev.2 8. Logic Level Specifications Where not specifically stated, all digital interface circuits work at 1.8V CMOS logic levels. The following table shows the logic level specifications used in the GE910 interface circuits: Absolute Maximum Ratings -Not Functional Parameter Min Max Input level on any digital pin (CMOS 1.8) when ON -0.3V +2.1V Operating Range - Interface levels (1.8V CMOS) Level Min Max Input high level 1.5V 1.9V Input low level 0V 0.35V Output high level 1.6V 1.9V Output low level 0V 0.2V Current characteristics Level Typical Output Current 1mA Input Current 1uA
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 49 of 83 Mod. 0805 2011-07 Rev.2 9. USB Port The GE910 includes one integrated universal serial bus (USB) transceiver USB 2.0 FS. Note: NOT supported on GE910-QUAD V3. 9.1. USB 2.0 FS This port is compliant with the USB 2.0 FS (Full Speed) specifications. The following table is listing the available signals: PAD Signal I/O Function Type COMMENT B15 USB_D+ I/O USB differential Data (+) 3.3V C15 USB_D- I/O USB differential Data (-) 3.3V A13 VUSB AI Power sense for USB presence 5V Accepted range 1.8V to 5V The USB_DPLUS and USB_DMINUS signals have a clock rate of 12 MHz. The signal traces should be routed carefully. Trace lengths, number of vias and capacitive loading should be minimized. The impedance value should be as close as possible to 90 Ohms differential. NOTE: VUSB pin should be disconnected before activating the Power Saving Mode.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 50 of 83 Mod. 0805 2011-07 Rev.2 10. Serial Ports The serial port on the GE910 is the core of the interface between the module and OEM hardware. 3 serial ports are available on the module: • MODEM SERIAL PORT 1 (Main) • MODEM SERIAL PORT 2 (Auxiliary) • MODEM SERIAL PORT 3 (NMEA on GE910-GNSS products). 10.1. Modem Serial Port Several configurations can be designed for the serial port on the OEM hardware, but the most common are: • 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 The serial port on the GE910 is a +1.8V CMOS UART with all the 8 RS232 signals. It differs from the PC-RS232 in the signal polarity (RS232 is reversed) and levels. For system working on different digital supply standard, a level translator circuit may be needed to make the system work properly. An Example of level translation implementation could be the use of a standard 74LVC245, a Dual-Supply Bus Transceiver, which Logic Diagram is shown here: To other Channels NOTE: OE connected to VAUX pin may be a useful solution to avoid Back-Powering by means of disabling the bus, not to supply a voltage level, while modem is OFF.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 51 of 83 Mod. 0805 2011-07 Rev.2 The signals of the GE910 Serial Port are: RS232 Pin Number Signal GE910 Pad Number Name Usage 1 DCD - dcd_uart N14 Data Carrier Detect Output from the GE910 that indicates the carrier presence 2 RXD - tx_uart M15 Transmit line *see Note Output transmit line of GE910 UART 3 TXD -rx_uart N15 Receive line *see Note Input receive of the GE910 UART 4 DTR - dtr_uart M14 Data Terminal Ready Input to the GE910 that controls the DTE READY condition 5 GND P13 Ground Ground 6 DSR - dsr_uart P14 Data Set Ready Output from the GE910 that indicates the module is ready 7 RTS -rts_uart L14 Request to Send Input to the GE910 that controls the Hardware flow control 8 CTS - cts_uart P15 Clear to Send Output from the GE910 that controls the Hardware flow control 9 RI - ri_uart R14 Ring Indicator Output from the GE910 that indicates the incoming call condition NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on the GE910 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 GE910 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: DTR pin should be disconnected before activating the Power Saving Mode. NOTE: In order to avoid a back powering effect it is recommended to avoid having HIGH logic level signal applied to digital pins of the module when powered off or during an ON/OFF transition.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 52 of 83 Mod. 0805 2011-07 Rev.2 10.2. RS232 level translation In order to interface the GE910 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). 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 53 of 83 Mod. 0805 2011-07 Rev.2 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:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 54 of 83 Mod. 0805 2011-07 Rev.2 11. Audio Section Overview The audio paths are: • Digital Voice Interface (DVI). • Analog Front-End. 11.1. Digital Voice Interface (DVI) 11.1.1. DVI Electrical Connections The product is providing the Digital Audio Interface (DVI) on the following Pins: Digital Voice Interface (DVI) PAD Signal I/O Function Note Type B9 DVI_WA0 I/O Digital Audio Interface (Word Alignment / LRCLK) CMOS 1.8V B6 DVI_RX I Digital Audio Interface (RX) CMOS 1.8V B7 DVI_TX O Digital Audio Interface (TX) CMOS 1.8V B8 DVI_CLK I/O Digital Audio Interface (BCLK) CMOS 1.8V NOTE: For more information refer to Telit document: "80000NT10004a Digital Voice Interface Application Note". 11.2. Analog Front-End 11.2.1. MIC connection The bias for the microphone has to be as clean as possible; the first connection (single ended) is preferable since the Vmic noise and ground noise are fed into the input as common mode and then rejected. This sounds strange; usually the connection to use in order to reject the common mode is the balanced one. In this situation we have to recall that the microphone is a sound to current transducer, so the resistor is the current to tension transducer, so finally the resistor feeds the input in balanced way even if the configuration, from a microphone point of view, seems to be un-balanced.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 55 of 83 Mod. 0805 2011-07 Rev.2 If a "balanced way" is anyway desired, much more care has to be taken to Vmic noise and ground noise; also the 33pF-100Ohm-33pF -RF filter has to be doubled (one each wire). 100n 1K1K10033pF 33pF100n 10033pF 33pF1K1uMIC+MIC-GNDVmic÷10K2÷5v÷10uTELIT MODULE-+INPUTADC TIP: Since the J-FET transistor inside the microphone acts as RF detector amplifier, ask vendor for a microphone with anti-EMI capacitor (usually a 33pF or a 10pF capacitor placed across the output terminals inside the case). 100n100n 1K2.2K1u100 33pF 33pF÷10uVmic MIC+ MIC- GND ÷10K 2÷5v TELIT MODULE -+INPUTADC+-
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 56 of 83 Mod. 0805 2011-07 Rev.2 11.2.2. LINE-IN connection 100n 10033pF 33pF100n 10033pF 33pFMIC+MIC-GNDLINE_IN+1Remote_GNDTELIT MODULE-+INPUTADC 100n 10033pF 33pF100n 10033pF 33pFMIC+MIC-GNDTELIT MODULE-+INPUTADCLINE_IN+LINE_IN- If the audio source is not a mike but a different device, the following connections can be done. Place 100nF capacitor in series with both inputs, so the DC current is blocked. Place the 33pF-100Ohm-33pF -RF filter, in order to prevent some EMI field to get into the high impedance high gain MIC inputs. Since the input is differential, the common mode voltage noise between the two (different) grounds is rejected, provided that both MIC+ & MIC- are connected directly onto the source.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 57 of 83 Mod. 0805 2011-07 Rev.2 11.2.3. EAR connection The audio output of the GE910 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 a power budget up to 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. 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. EAR+EAR- TELIT MODULE-+OUTPUTDAC
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 58 of 83 Mod. 0805 2011-07 Rev.2 L-C filtering for LOW impedance load. R-C filtering for HIGH impedance load. EAR+EAR- TELIT MODULE-+ OUTPUTDACGND EAR+EAR- TELIT MODULE-+ OUTPUTDACGNDHiZ CIRCUITRY
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 59 of 83 Mod. 0805 2011-07 Rev.2 11.2.4. Electrical Characteristics 11.2.4.1. Input Lines Microphone/Line-in path Line Type Differential Coupling capacitor  100nF Differential input resistance 10k Levels To have 0dBm0 @1KHz (*) Differential input voltage AT#HFMICG=0 290mVrms AT#HFMICG=1 (+6dB) 145mVrms AT#HFMICG=2 (+12dB) 72mVrms AT#HFMICG=3 (+18dB) 36mVrms AT#HFMICG=4 (+24dB) 18mVrms AT#HFMICG=5 (+30dB) 9mVrms AT#HFMICG=6 (+36dB) 4.5mVrms AT#HFMICG=7 (+42dB) 2.25mVrms (*) 0 dBm0 in the network are -3.14 dBfs TIP: The Electret microphone is internally amplified by a J-FET transistor, thus the sound is carried out as saturation drain current; this means that the Norton equivalence has to be considered. The signal is converted to voltage on the 2.2KOhm resistance, from there on circuitry has to be routed in order to not pick up common mode noise; beware of the return path (ground).
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 60 of 83 Mod. 0805 2011-07 Rev.2 11.2.4.2. Output Lines EAR/Line-out Output Differential line coupling Direct connection (VDC=1.3÷1.6V) output load resistance  8  signal bandwidth 250÷3400Hz (@ -3dB with default filter) max. differential output voltage 1120mVpp @3.14dBm0 (*) differential output voltage 550mVrms @0dBm0 (*) volume -20÷0 dB step 2dB (*) in default condition: AT+CLVL=10, AT#HFRECG=0 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. However if particular OEM application needs, also a Single Ended (S.E) circuitry can be implemented. The OEM circuitry shall be designed to reduce the common mode noise typically generated by the return path of the big currents. 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. NOTES: For more information refer to Telit document: "80000NT10007a Audio Settings Application Note".
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 61 of 83 Mod. 0805 2011-07 Rev.2 12. 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: they report the digital value (high or low) present on the pad at the moment of reading. Output pads: can be written, set the output value of the pad, and read. Alternate function pad: internally controlled by the GE910 firmware and acts depend on implemented function. The following table shows the available GPIO on the GE910. PAD Signal I/O Function Type Drive strength Default State Note C8 GPIO_01 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD Alternate function STAT LED C9 GPIO_02 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD C10 GPIO_03 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD C11 GPIO_04 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD B14 GPIO_05 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD Alternate function RFTXMON C12 GPIO_06 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD C13 GPIO_07 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD K15 GPIO_08 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD L15 GPIO_09 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD G15 GPIO_10 I/O Configurable GPIO CMOS 1.8V 1 mA INPUT PD NOTE: Pull-Up or Pull-Down can be set on every GPIO, see “AT Commands Reference Guide”. By default at start time, if no previous set were saved, they are set as Input Pull-Down.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 62 of 83 Mod. 0805 2011-07 Rev.2 12.1. 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 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. 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 GE910 when the module is powered off or during an ON/OFF transition. 12.2. 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 63 of 83 Mod. 0805 2011-07 Rev.2 12.3. Indication of network service availability The STAT_LED pin status shows information on the network service availability and Call status. In the GE910 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) Net search / Not registered / turning off Slow blinking (Period 3s, Ton 0,3s) Registered full service Permanently on a call is active A schematic example could be:
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 64 of 83 Mod. 0805 2011-07 Rev.2 12.4. 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 capacitor can be added in order to increase the RTC autonomy during power off of the battery. NO Devices must be powered from this pin. If ON_OFF* signal is connected to GND, the RTC autonomy will decrease. WARNING: Never connect VRTC pin to VBATT. 12.5. External SIM Holder Implementation NOTE: Please refer to the related User Guide (SIM Holder Design Guides, 80000NT10001a). 12.6. ADC Converter 12.6.1. Description The on board ADC has 10-bit resolution. It is able to read a voltage level in the range of 0÷1.3 volts, to store and to convert into a 10 bits word. Min Max Units Input Voltage range 0 1.3 Volt AD conversion - 10 bits Resolution - < 1.3 mV The ADC input line is named as ADC_IN1 and it is available on PAD B1. 12.6.2. Using ADC Converter AT command to manage the ADC is: AT#ADC=1,2 The read value is expressed in mV NOTE: Refer to SW User Guide or AT Commands Reference Guide for the full description of this function.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 65 of 83 Mod. 0805 2011-07 Rev.2 13. Mounting the GE910 on your Board 13.1. General The GE910 modules have been designed in order to be compliant with a standard lead-free SMT process. 13.2. Module finishing & dimensions The GE910 overall dimensions are: • Length: 28.2 mm • Width: 28.2 mm • Thickness: 2.25 mm • Weight: 3.6 g
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 66 of 83 Mod. 0805 2011-07 Rev.2 13.3. Recommended foot print for the application In order to easily rework the GE910 is suggested to consider on the application a 1.5mm 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 INHIBIT WIRING must be clear from signal or ground paths.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 67 of 83 Mod. 0805 2011-07 Rev.2 13.4. Stencil Stencil’s apertures layout can be the same of the recommended footprint (1:1), we suggest a thickness of stencil foil  120µm. 13.5. PCB pad design Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB. 13.6. Recommendations for PCB pad dimensions Units are in mm.PCB Copper Pad Pad Solder Mask SMD (Solder Mask Defined) NSMD (Non Solder Mask Defined)
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 68 of 83 Mod. 0805 2011-07 Rev.2 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. When using the hole in pad, we suggest the via filling. Recommendations for PCB pad surfaces: Finish Layer thickness [µm] Properties Electro-less Ni / Immersion Au 3 –7 / 0.05 – 0.15 good solder ability protection, high shear force values 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 tin-lead solder paste on the described surface plating is better compared to lead-free solder paste. Inhibit area for micro-via
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 69 of 83 Mod. 0805 2011-07 Rev.2 13.7. Solder paste Lead free Solder paste Sn/Ag/Cu We recommend using only “no clean” solder paste in order to avoid the cleaning of the modules after assembly. 13.7.1. GE910 Solder reflow Recommended solder reflow profile TL Tsmin Tsmax ts tL tp ttp
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 70 of 83 Mod. 0805 2011-07 Rev.2 Profile Feature Pb-Free Assembly Average ramp-up rate (TL to TP) 3°C/second max Preheat – Temperature Min (Tsmin) – Temperature Max (Tsmax) – Time (min to max) (ts) 150°C 200°C 60-180 seconds Tsmax to TL – Ramp-up Rate 3°C/second max Time maintained above: – Temperature (TL) – Time (tL) 217°C 60-150 seconds Peak Temperature (Tp) 245 +0/-5°C Time within 5°C of actual Peak Temperature (tp) 10-30 seconds Ramp-down Rate 6°C/second max. Time 25°C to Peak Temperature (ttp) 8 minutes max. NOTE: All temperatures refer to topside of the package, measured on the package body surface WARNING: The GE910 module withstands one reflow process only.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 71 of 83 Mod. 0805 2011-07 Rev.2 14. Packing system Is possible to order in two packaging system: • Package on reel • Package on tray 14.1. Packing on Reel The GE910 can be packaged on reels of 200 pieces each. See figure for module positioning into the carrier. 14.1.1. Carrier Tape Detail
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 72 of 83 Mod. 0805 2011-07 Rev.2 14.1.2. Reel Detail
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 73 of 83 Mod. 0805 2011-07 Rev.2 14.1.3. Packaging Detail
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 74 of 83 Mod. 0805 2011-07 Rev.2 14.2. Packing on tray The GE910 modules are packaged on trays of 20 pieces each. These trays can be used in SMT processes for pick & place handling.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 75 of 83 Mod. 0805 2011-07 Rev.2
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 76 of 83 Mod. 0805 2011-07 Rev.2 14.3. Moisture sensibility The level of moisture sensibility 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 must be 12 months from the bag seal date, when stored in a non-condensing atmospheric environment of <40°C / 90% RH b) Environmental condition during the production: <= 30°C / 60% RH according to IPC/JEDEC J-STD-033A paragraph 5 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-033A 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 77 of 83 Mod. 0805 2011-07 Rev.2 15. Conformity Assessment Issues European Union - Directive 1999/5/EC The GE910-QUAD module has been evaluated against the essential requirements of the 1999/5/EC Directive. Bulgarian   Telit Communications S.p.A. ,  Quad Band GSM/GPRS module           1999/5/ . Czech Telit Communications S.p.A. tímto prohlašuje, že tento Quad Band GSM/GPRS module je ve shod! se základními požadavky a dalšími p"íslušnými ustanoveními sm!rnice 1999/5/ES. Danish Undertegnede Telit Communications S.p.A. erklærer herved, at følgende udstyr Quad 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 Quad 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 Quad 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 Quad 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 Quad Band GSM/GPRS module in Übereinstimmung mit den grundlegenden Anforderungen und den übrigen einschlägigen Bestimmungen der Richtlinie 1999/5/EG befindet. Greek #$ %&' ()*+,-) Telit Communications S.p.A. .&/'$0 +%0 Quad Band GSM/GPRS module -,##+*1'$%)0 (*+- %0- +,-0.$0- )()0%&-$0- 2)0 %0- /+0($- -3$%02$- .0)%)4$0- %&- +.&50)- 1999/5/$2. Hungarian Alulírott, Telit Communications S.p.A. nyilatkozom, hogy a Quad Band GSM/GPRS module megfelel a vonatkozó alapvetõ követelményeknek és az 1999/5/EC irányelv egyéb elõírásainak. Finnish Telit Communications S.p.A. vakuuttaa täten että Quad 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 Quad 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 Quad 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 Quad Band GSM/GPRS module è conforme ai requisiti essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva 1999/5/CE.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 78 of 83 Mod. 0805 2011-07 Rev.2 Latvian Ar šo Telit Communications S.p.A. deklar6, ka Quad Band GSM/GPRS module atbilst Direkt7vas 1999/5/EK b8tiskaj9m pras7b9m un citiem ar to saist7tajiem noteikumiem. Lithuanian Šiuo Telit Communications S.p.A. deklaruoja, kad šis Quad Band GSM/GPRS module atitinka esminius reikalavimus ir kitas 1999/5/EB Direktyvos nuostatas. Maltese Hawnhekk, Telit Communications S.p.A., jiddikjara li dan Quad Band GSM/GPRS module jikkonforma mal-:ti;ijiet essenzjali u ma provvedimenti o:rajn relevanti li hemm fid-Dirrettiva 1999/5/EC. Norwegian Telit Communications S.p.A. erklærer herved at utstyret Quad 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. o<wiadcza, =e Quad 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 Quad 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 Quad Band GSM/GPRS module sp>?a základné požiadavky a všetky príslušné ustanovenia Smernice 1999/5/ES. Slovenian Telit Communications S.p.A. izjavlja, da je ta Quad Band GSM/GPRS module v skladu z bistvenimi zahtevami in ostalimi relevantnimi dolo@ili direktive 1999/5/ES. Spanish Por medio de la presente Telit Communications S.p.A. declara que el Quad 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 Quad 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, GE910-QUAD module is compliant with the following standards: RF spectrum use (R&TTE art. 3.2) EN 301 511 V9.0.2; EN 62311:2008 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
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 79 of 83 Mod. 0805 2011-07 Rev.2 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 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 GE910-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: RF spectrum use (R&TTE art. 3.2) It will depend on the antenna used on the final product. EMC (R&TTE art. 3.1b) Testing Health & Safety (R&TTE art. 3.1a) Testing 1909
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 80 of 83 Mod. 0805 2011-07 Rev.2 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 6.43 dBi PCS 1900 3.00 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 6.43 dBi PCS 1900 3.00 dBi L'émetteur ne doit pas être colocalisé ni fonctionner conjointement avec à autre antenne ou autre émetteur.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 81 of 83 Mod. 0805 2011-07 Rev.2 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: RI7GE910Q3 Contains IC: 5131A-GE910Q3 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: RI7GE910Q3 Contient IC: 5131A-GE910Q3 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.
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 82 of 83 Mod. 0805 2011-07 Rev.2 16. 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://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
GE910 Hardware User Guide 1vv0300962 Rev.12 2013-10-22 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 83 of 83 Mod. 0805 2011-07 Rev.2 17. Document History RReevviissiioonn DDaattee CChhaannggeess Rev.0 2011-11-11 First Release Rev.0 Preliminary 1 Rev.1 2012-02-27 First Release Rev.1 Rev.2 2012-06-07 Added chapter 11.7 ADC Converter – renaming pin RESET# in HW SHUTDOWN* Chapter 5.2 Power consumption Rev.3 2012-06-20 Added chapter 12.3 inhibit area around the RF pins Rev.4 2012-06-25 Updated chapter 15 Conformity Assessment Issues Rev.5 2012-06-28 Minor changes Rev.6 2012-07-27 Chapter 3.2. The pin E13 is RESERVED; chapter 3.1. – pin R13, pinR12 and B1 Rev.7 2012-10-12 Changed name of Chapter 10.1. from AF_IN to MIC, added a note about USB 2.0 FS Rev.8 2012-10-30 Updated chapter 10.3 Rev.9 2013-03-01 Updated GNSS features, Pin-out, DVI, Power Consumptions plots, Reel Packaging Rev.10 2013-03-25 Updated the default NMEA speed to 115200; some fields on GNSS variant. Rev.11 2013-03-26 Updated with GE910-QUAD V3 variant; Rev.11bis 2013-10-15 Updated Chapter 15 with correct antenna gain values and Labelling Requirements for the Host device Rev.12 2013-10-25 Updated Chapter 15 with correct antenna gain values

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