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GE910
Hardware User's Manual
73 pgs1.38 Mb0

Telit Wireless Solutions GE910, GE910-QUAD, GE910-GNSS, GE910-QUAD V3 Hardware User's Manual

GE910 Hardware User Guide
1vv0300962 Rev.12 – 2013-10-22
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APPLICABILITY TABLE
PRODUCT
GE910-GNSS GE910-QUAD GE910-QUAD V3
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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 fault­tolerant 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
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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:
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.
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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_R X 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_RX C105/RTS C108/DTR C109/DCD C107/DSR C1 25/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
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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.
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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
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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.
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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:
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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.
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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
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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:
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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
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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.
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