Telit Wireless Solutions GE910 Installation 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
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SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Notice
While reasonable efforts have been made to assure the accuracy of this document, Telit assumes
no liability resulting from any inaccuracies or omissions in this document, or from use of the
information obtained herein. The information in this document has been carefully checked and is
believed to be entirely reliable. However, no responsibility is assumed for inaccuracies or
omissions. Telit reserves the right to make changes to any products described herein and
reserves the right to revise this document and to make changes from time to time in content
hereof with no obligation to notify any person of revisions or changes. Telit does not assume
any liability arising out of the application or use of any product, software, or circuit described
herein; neither does it convey license under its patent rights or the rights of others.
It is possible that this publication may contain references to, or information about Telit products
(machines and programs), programming, or services that are not announced in your country.
Such references or information must not be construed to mean that Telit intends to announce
such Telit products, programming, or services in your country.
Copyrights
This instruction manual and the Telit products described in this instruction manual may be,
include or describe copyrighted Telit material, such as computer programs stored in
semiconductor memories or other media. Laws in the Italy and other countries preserve for Telit
and its licensors certain exclusive rights for copyrighted material, including the exclusive right
to copy, reproduce in any form, distribute and make derivative works of the copyrighted
material. Accordingly, any copyrighted material of Telit and its licensors contained herein or in
the Telit products described in this instruction manual may not be copied, reproduced,
distributed, merged or modified in any manner without the express written permission of Telit.
Furthermore, the purchase of Telit products shall not be deemed to grant either directly or by
implication, estoppel, or otherwise, any license under the copyrights, patents or patent
applications of Telit, as arises by operation of law in the sale of a product.
Computer Software Copyrights
The Telit and 3rd Party supplied Software (SW) products described in this instruction manual
may include copyrighted Telit and other 3rd Party supplied computer programs stored in
semiconductor memories or other media. Laws in the Italy and other countries preserve for Telit
and other 3rd Party supplied SW certain exclusive rights for copyrighted computer programs,
including the exclusive right to copy or reproduce in any form the copyrighted computer
program. Accordingly, any copyrighted Telit or other 3rd Party supplied SW computer programs
contained in the Telit products described in this instruction manual may not be copied (reverse
engineered) or reproduced in any manner without the express written permission of Telit or the
3rd Party SW supplier. Furthermore, the purchase of Telit products shall not be deemed to grant
either directly or by implication, estoppel, or otherwise, any license under the copyrights,
patents or patent applications of Telit or other 3rd Party supplied SW, except for the normal
non-exclusive, royalty free license to use that arises by operation of law in the sale of a product.

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Usage and Disclosure Restrictions
License Agreements
The software described in this document is the property of Telit and its licensors. It is furnished
by express license agreement only and may be used only in accordance with the terms of such
an agreement.
Copyrighted Materials
Software and documentation are copyrighted materials. Making unauthorized copies is
prohibited by law. No part of the software or documentation may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any language or computer language,
in any form or by any means, without prior written permission of Telit
High Risk Materials
Components, units, or third-party products used in the product described herein are NOT fault-
tolerant and are NOT designed, manufactured, or intended for use as on-line control equipment
in the following hazardous environments requiring fail-safe controls: the operation of Nuclear
Facilities, Aircraft Navigation or Aircraft Communication Systems, Air Traffic Control, Life
Support, or Weapons Systems (High Risk Activities"). Telit and its supplier(s) specifically
disclaim any expressed or implied warranty of fitness for such High Risk Activities.
Trademarks
TELIT and the Stylized T Logo are registered in Trademark Office. All other product or service
names are the property of their respective owners.
Copyright © Telit Communications S.p.A. 2013

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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

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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
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1. Introduction
1.1. Scope
The aim of this document is the description of some hardware solutions useful for developing a
product with the Telit 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:
[email protected]
TS-NORTHAMERI[email protected]
TS-LATI[email protected]
[e-mail]
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.

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1.4. Document Organization
This document contains the following chapters:
Chapter 1: “Introduction” provides a scope for this document, target audience, contact and
support information, and text conventions.
Chapter 2: “Overview” provides an overview of the document.
Chapter 3: “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”

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1.5. Text Conventions
Danger – This information MUST be followed or catastrophic equipment failure or bodily
injury may occur.
Caution or Warning – Alerts the user to important points about integrating the module, if
these points are not followed, the module and end user equipment may fail or malfunction.
Tip or Information – Provides advice and suggestions that may be useful when integrating
the module.
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

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2. Overview
The aim of this document is the description of some hardware solutions useful for developing a
product with the Telit 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.

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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

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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

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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

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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

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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.

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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_SHUT DOWN*
14 RES GPIO_05 VRTC RES GND RES GNSS_EN* RES GNSS _NMEA_T
X
GNSS
_NMEA_R
XC105/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: