GE863 Family Hardware User Guide For GE863-PY, GE863-QUAD, GE863-SIM and GE863-GPS

GE863 Family Hardware User Guide
For GE863-PY, GE863-QUAD, GE863-SIM and GE863-GPS
1vv0300783 Rev.4 – 2009-12-16
GE863 Family Hardware User Guide
1vv0300783 Rev.4 – 2009-12-16
APPLICABILITY TABLE
PRODUCT
GE863-PY
GE863-QUAD
GE863-SIM
GE863-GPS
NOTE:
This document substitutes the following specifications:
1vv0300715 GE863-QUAD/PY Hardware User Guide
1vv0300714 GE863-GPS Hardware User Guide
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GE863 Family Hardware User Guide
1vv0300783 Rev.4 – 2009-12-16
Disclaimer
The information contained in this document is the proprietary information of Telit
Communications S.p.A. and its affiliates (“TELIT”).
The contents are confidential and any disclosure to persons other than the officers,
employees, agents or subcontractors of the owner or licensee of this document,
without the prior written consent of Telit, is strictly prohibited.
Telit makes every effort to ensure the quality of the information it makes available.
Notwithstanding the foregoing, Telit does not make any warranty as to the
information contained herein, and does not accept any liability for any injury, loss or
damage of any kind incurred by use of or reliance upon the information.
Telit disclaims any and all responsibility for the application of the devices
characterized in this document, and notes that the application of the device must
comply with the safety standards of the applicable country, and where applicable,
with the relevant wiring rules.
Telit reserves the right to make modifications, additions and deletions to this
document due to typographical errors, inaccurate information, or improvements to
programs and/or equipment at any time and without notice.
Such changes will, nevertheless be incorporated into new editions of this document.
Copyright: Transmittal, reproduction, dissemination and/or editing of this document
as well as utilization of its contents and communication thereof to others without
express authorization are prohibited. Offenders will be held liable for payment of
damages. All rights are reserved.
Copyright © Telit Communications SpA 2009.©
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Contents
1.
INTRODUCTION ................................................................................................................................ 7
1.1.
1.2.
1.3.
1.4.
1.5.
1.6.
1.7.
SCOPE ........................................................................................................................................................... 7
AUDIENCE...................................................................................................................................................... 7
CONTACT INFORMATION, SUPPORT................................................................................................................... 7
DOCUMENT ORGANIZATION.............................................................................................................................. 8
TEXT CONVENTIONS ........................................................................................................................................ 9
RELATED DOCUMENTS .................................................................................................................................... 9
DOCUMENT HISTORY ..................................................................................................................................... 10
2.
OVERVIEW ...................................................................................................................................... 11
3.
GE863 MECHANICAL DIMENSIONS ................................................................................................ 12
4.
GE863 MODULE CONNECTIONS ..................................................................................................... 13
4.1.
4.2.
5.
7.
8.
PIN-OUT .................................................................................................................................................... 13
PINS LAYOUT .............................................................................................................................................. 17
HARDWARE COMMANDS ................................................................................................................ 18
5.1.
5.2.
5.3.
TURNING ON THE GE863 ............................................................................................................................. 18
TURNING OFF THE GE863 ............................................................................................................................ 20
RESETTING THE GE863................................................................................................................................. 21
6.1.
6.2.
6.3.
POWER SUPPLY REQUIREMENTS .................................................................................................................... 26
EMBODIED BATTERY CHARGER ...................................................................................................................... 29
GENERAL DESIGN RULES .............................................................................................................................. 30
5.3.1.
5.3.2.
Hardware Unconditional Shutdown (for GE863-GPS only) ............................................................ 21
Hardware Unconditional restart (GE863-QUAD/PY/SIM only) ...................................................... 24
6.3.1.
6.3.2.
6.3.3.
6.3.4.
Electrical Design Guidelines ........................................................................................................... 30
Thermal Design Guidelines ............................................................................................................. 36
Power Supply PCB Layout Guidelines ............................................................................................ 37
Parameters for ATEX Application ................................................................................................... 38
ANTENNA ...................................................................................................................................... 39
7.1.
7.2.
7.3.
7.4.
GSM ANTENNA REQUIREMENTS .................................................................................................................... 39
GSM ANTENNA - PCB LINE GUIDELINES ....................................................................................................... 40
GSM ANTENNA - INSTALLATION GUIDELINES.................................................................................................. 40
GPS ANTENNA REQUIREMENTS ..................................................................................................................... 41
7.5.
7.6.
7.7.
GPS ANTENNA - PCB LINE GUIDELINES ........................................................................................................ 42
GPS ANTENNA - INSTALLATION GUIDELINES .................................................................................................. 43
LOGIC LEVEL SPECIFICATIONS ....................................................................................................................... 44
7.4.1.
7.4.2.
7.4.3.
Combined GPS Antenna .................................................................................................................. 41
Linear and Patch GPS Antenna ....................................................................................................... 41
LNA and Front End Design Considerations.................................................................................... 41
7.7.1.
Reset Signal ..................................................................................................................................... 45
SERIAL PORTS ............................................................................................................................... 46
8.1.
GE863-GPS SERIAL PORTS ......................................................................................................................... 46
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8.2.
8.3.
8.4.
GE863-QUAD/PY/SIM SERIAL PORTS ......................................................................................................... 46
MODEM SERIAL PORT ................................................................................................................................... 47
GE863-GPS SECONDARY PORTS .................................................................................................................. 49
8.5.
GE863-QUAD/PY/SIM SECONDARY PORT .................................................................................................... 50
8.6.
8.7.
RS232 LEVEL TRANSLATION ......................................................................................................................... 50
5V UART LEVEL TRANSLATION ..................................................................................................................... 53
9.
8.4.1.
8.4.2.
8.4.3.
Modem Serial Port 2 (GPS Control) ................................................................................................ 49
GPS Serial Port A (SIRF Binary) ...................................................................................................... 49
GPS Serial Port B (NMEA) ............................................................................................................... 49
8.5.1.
Modem Serial Port 2 (Python Debug) ............................................................................................. 50
AUDIO SECTION OVERVIEW ............................................................................................................ 55
9.1.
9.2.
SELECTION MODE ......................................................................................................................................... 55
ELECTRICAL CHARACTERISTICS...................................................................................................................... 57
9.2.1.
9.2.2.
10.
Input Lines Characteristics ............................................................................................................. 57
Output Lines Characteristics .......................................................................................................... 58
GENERAL PURPOSE I/O ............................................................................................................. 60
10.1.
10.2.
10.3.
10.4.
10.5.
10.6.
10.7.
10.8.
GPIO LOGIC LEVELS ................................................................................................................................. 62
USING A GPIO PAD AS INPUT .................................................................................................................... 63
USING A GPIO PAD AS OUTPUT ................................................................................................................. 63
USING THE RF TRANSMISSION CONTROL GPIO4 ......................................................................................... 63
USING THE RFTXMON OUTPUT GPIO5 ..................................................................................................... 63
USING THE ALARM OUTPUT GPIO6 ............................................................................................................ 64
USING THE BUZZER OUTPUT GPIO7 .......................................................................................................... 65
MAGNETIC BUZZER CONCEPTS .................................................................................................................. 66
10.9.
USING THE TEMPERATURE MONITOR FUNCTION .......................................................................................... 68
10.10.
INDICATION OF NETWORK SERVICE AVAILABILITY ......................................................................................... 70
10.8.1.
10.8.2.
10.8.3.
10.8.4.
10.9.1.
10.9.2.
11.
Short Description ............................................................................................................................. 66
Frequency Behavior ......................................................................................................................... 67
Power Supply Influence ................................................................................................................... 67
Working Current Influence.............................................................................................................. 67
Short Description ............................................................................................................................. 68
Allowed GPIO.................................................................................................................................... 68
RTC AND AUXILIARY SUPPLY ..................................................................................................... 71
11.1.
11.2.
12.
RTC BYPASS OUT .................................................................................................................................... 71
VAUX1 POWER OUTPUT ........................................................................................................................... 71
PPS GPS OUTPUT (GE863-GPS ONLY) ........................................................................................ 72
12.1.
12.2.
13.
DESCRIPTION ........................................................................................................................................... 72
PULSE CHARACTERISTICS ......................................................................................................................... 72
DAC AND ADC SECTION ............................................................................................................. 73
13.1.
13.1.1.
13.1.2.
13.1.3.
DAC CONVERTER ..................................................................................................................................... 73
Description ....................................................................................................................................... 73
Enabling DAC ................................................................................................................................... 73
Low Pass Filter Example ................................................................................................................. 74
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13.2.
13.2.1.
13.2.2.
14.
Description ....................................................................................................................................... 74
Using ADC Converter ....................................................................................................................... 75
MOUNTING THE GE863 ON THE APPLICATION BOARD ............................................................... 76
14.1.
14.1.1.
14.1.2.
14.1.3.
14.1.4.
14.1.5.
14.1.6.
14.1.7.
14.1.8.
15.
ADC CONVERTER ..................................................................................................................................... 74
GENERAL................................................................................................................................................. 76
Module Finishing & Dimensions ..................................................................................................... 76
Recommended Foot Print for the Application................................................................................ 77
Suggested Inhibit Area .................................................................................................................... 78
Debug of the GE863 in Production .................................................................................................. 79
Stencil ............................................................................................................................................... 79
PCB Pad Design ............................................................................................................................... 80
Solder Paste ..................................................................................................................................... 81
GE863 Solder Reflow ....................................................................................................................... 82
PACKING SYSTEM ...................................................................................................................... 84
15.1.1.
Moisture Sensibility ......................................................................................................................... 86
16.
CONFORMITY ASSESSMENT ISSUES .......................................................................................... 87
17.
SAFETY RECOMMENDATIONS .................................................................................................... 89
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GE863 Family 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 GE863-GPS / QUAD / PY / SIM modules.
1.2.
Audience
This document is intended for Telit customers, who are integrators, about to
implement their applications using our modules of the GE863 Family.
1.3.
Contact Information, Support
For general contact, technical support, to report documentation errors and to order
manuals, contact Telit’s Technical Support Center (TTSC) at:
TS-EMEA@telit.com
TS-NORTHAMERICA@telit.com
TS-LATINAMERICA@telit.com
TS-APAC@telit.com
Alternatively, use:
http://www.telit.com/en/products/technical-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 Center (TTSC).
Our aim is to make this guide as helpful as possible. Keep us informed of your
comments and suggestions for improvements.
Telit appreciates feedback from the users of our information.
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1.4.
Document Organization
This document contains the following chapters:
Chapter 1: “Introduction” provides a scope for this document, target audience,
contact and support information, and text conventions.
Chapter 2: “Overview” provides an overview of the document.
Chapter 3: “GE863 Mechanical Dimensions”
Chapter 4: “GE863 Module Connections” deals with the pin out configuration and
layout.
Chapter 5: “Hardware Commands” How to operate on the module via hardware.
Chapter 6: “Power supply” Power supply requirements and general design rules.
Chapter 7: “Antenna” The antenna connection and board layout design are the most
important parts in the full product design
Chapter 8: “Serial ports” The serial port on the Telit GE863 is the core of the
interface between the module and OEM hardware
Chapter 9: “Audio Section overview” Refers to the audio blocks of the Base Band Chip
of the GE863 Telit Modules
Chapter 10: “General Purpose I/O” How the general purpose I/O pads can be
configured.
Chapter 11: “RTC and Auxiliary Supply”
Chapter 12: “PPS GPS Output (GE863-GPS only)”
Chapter 13 “DAC and ADC Section” Deals with these two kind of converters.
Chapter 14: “Mounting the GE863 on the application board” Recommendations and
specifics on how to mount the module on the user’s board.
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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 GSM/GPRS Family Software User Guide, 1vv0300784
•
GE863 Product Description, 80278ST10016a
•
Audio Settings Application Note , 80000NT10007a
•
Digital voice Interface Application Note, 80000NT10004a
•
AT Commands Reference Guide, 80000ST10025a
•
Telit EVK2 User Guide, 1vv0300704
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GE863 Family Hardware User Guide
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1.7.
R e v i si o n
ISSUE #0
ISSUE #1
ISSUE#2
ISSUE#3
Document History
Date
Changes
2008-06-10 First release
2009-02-03 updated P/N List
§4:
Updated turn on, turn off and reset procedure
Added OFF current
Updated operating voltage
Added ATEX parameters
§8 : Updated IO Levels Table
2009-03-25 Added new disclaimer
Updated § 12.2 Modules with single label, orientation on the tray
§4 Added clarification on Turn ON / Turn OFF pulse duration
2009-08-31 Applied new layout + minor editing
Added DVI info in the pin-out section + notice
Added DVI App note in the related documents list
Added embodied battery charger description
Noted in the pin-out section about RTS in need of being connected to ground
and DTR should be pulled up if not used.
Updated chapter 9 Audio Section
Updated schematic drawings
ISSUE #4
2009-12-16 Updated hardware command section
Updated power consumption section
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GE863 Family Hardware User Guide
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2.
Overview
NOTICE:
The integration of the GSM/GPRS GE863-GPS/QUAD/PY/SIM cellular module within
user application must be done according to the design rules described in this manual.
In this document all the basic functions of a mobile phone are taken into account; for
each one of them a proper hardware solution is suggested and eventually the wrong
solutions and common errors to be avoided will be evidenced. This document is not
intended to embrace the whole hardware solutions and products that may be
designed. Wrong solutions to be avoided must be considered as mandatory, while
hardware configurations are only suggested. This document can be regarded as a
guide and a starting point to properly develop your product with the Telit GE863-GPS
/ QUAD / PY / SIM modules. For further hardware details that may not be explained in
this document refer to the Telit GE863 Product Description document where all the
hardware information is reported.
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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GE863 Family Hardware User Guide
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3.
GE863 Mechanical Dimensions
The Telit GE863 module’s overall dimensions are:
•
Length: 41,4 mm
•
Width: 31,4 mm
•
Thickness: 3,6 Mm
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GE863 Family Hardware User Guide
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4.
GE863 Module Connections
4.1.
PIN-OUT
BGA
Ball
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Signal
I/O
GPIO13
GPIO12
GPIO11
GPIO10
GPIO9
GPIO8
RESERVED
GND
EAR_MTEAR_MT+
EAR_HF+
EAR_HFMIC_MT+
MIC_MTMIC_HF+
MIC_HFGND
SIMCLK
SIMRST
SIMIO
SIMIN
SIMVCC
ADC_IN1
VRTC
TX_TRACE
I/O
I/O
I/O
I/O
I/O
I/O
AO
AO
AO
AO
AI
AI
AI
AI
O
O
I/O
I/O
AI
AO
26
RX_TRACE
27
28
29
30
31
32
VBATT
GND
STAT_LED
AXE
VAUX1
GPIO4
O
I
I/O
Internal
Type
Pull up
GPIO13
CMOS 2.8V
GPIO12
47KΩ
CMOS 2.8V
GPIO11
4.7KΩ
CMOS 2.8V
GPIO10
CMOS 2.8V
GPIO9
CMOS 2.8V
GPIO8
CMOS 2.8V
RESERVED
Ground
Power
Handset earphone signal output, phase Audio
Handset earphone signal output, phase +
Audio
Handsfree ear output, phase +
Audio
Handsfree ear output, phase Audio
Handset microphone signal input; phase+
Audio
Handset microphone signal input; phaseAudio
Handsfree microphone input; phase +
Audio
Handsfree microphone input; phase Audio
Ground
Power
External SIM signal - Clock
1.8/3V ONLY
External SIM signal - Reset
1.8/3V ONLY
External SIM signal - Data I/O
1.8/3V ONLY
External SIM signal - Presence (active low)
47KΩ
CMOS 2.8V
External SIM signal - Power
1.8/3V ONLY
Analog /Digital converter input
A/D
VRTC Backup capacitor
Power
TX data for GPS control (TX data for Debug in
CMOS 2.8V
case of GE863-QUAD/PY/SIM)
RX data for GPS control (RX data for Debug in
CMOS 2.8V
case of GE863-QUAD/PY/SIM)
Main power supply
Power
Ground
Power
Status indicator led
CMOS 1.8V
Handsfree switching
100KΩ
CMOS 2.8V
Power output for external accessories
GPIO4 Configurable general purpose I/O pin/ 4.7KΩ
CMOS 2.8V
Function
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BGA
Ball
Signal
I/O
Function
Internal
Type
Pull up
DVI2_CLK (Digital Voice Interface)
GPIO2 Configurable general purpose I/O pin / 47KΩ
Jammer Detect Output
GPIO1 Configurable general purpose I/O pin
Charger input
Ground
Serial data input (TXD) from DTE
Serial data output to DTE
Input for Data terminal ready signal (DTR)
from DTE
Input for Request to send signal (RTS) from
DTE
Output for Clear to send signal (CTS) to DTE
Output for Data carrier detect signal (DCD) to
DTE
Output for Data set ready signal (DSR) to DTE
Output for Ring indicator signal (RI) to DTE
Ground
CMOS 2.8V
Pull up to
VBATT
I
O
I/O
Input command for switching power ON or
OFF (toggle command).
Reset input
Ground
GSM Antenna output - 50 Ω
Ground
GPIO7 / BUZZER output
O
I/O
Power ON Monitor
GPIO5 / RF TX_ON signalling output
CMOS 2.8V
CMOS 2.8V
I/O
GPIO6 / ALARM output
CMOS 2.8V
I/O
-
GPIO3
Ground
33
GPIO2 / JDR I/O
34
35
36
37
38
39
GPIO1
CHARGE
GND
C103/TXD
C104/RXD
C108/DTR 1
I/O
AI
I
O
I
40
C105/RTS 2
I
41
42
C106/CTS
C109/DCD
O
O
43
44
45
C107/DSR O
C125/RING O
GND
46
ON_OFF*
I
47
48
49
50
51
RESET*
GND
ANTENNA
GND
GPIO7 /
BUZZER
PWRMON
GPIO5
RFTXMON
GPIO6
ALARM
GPIO3
GND
52
53
54
55
56
1
2
-
47KΩ
CMOS 2.8V
Power
Power
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
Power
Power
RF
Power
CMOS 2.8V
47KΩ
CMOS 2.8V
Power
DTR Lines should be set correctly (pull-up), since a transition of the DTR causes closing of multiplexer
RTS should be connected to the GND (on the module side) if flow control is not used.
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BGA
Ball
57
58
59
Signal
I/O
RESERVED CLK
I/O
GPIO17
I/O
Internal
Type
Pull up
RESERVED
Python Debug (CLK) 3
CMOS 2.8V
GPIO17 Configurable general purpose I/O pin/
CMOS 2.8V
DVI2_WA (Digital Voice Interface)
Function
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
GPIO14
MRST
RESERVED
DAC_OUT
GPIO16
RESERVED
MTSR
GND
TX_GPS
GND
RESERVED
GPIO15
GND
RX_GPS
RESERVED
PPS
I/O
I/O
O
I/O
I/O
I/O
O
GPIO
Python Debug (MRST) 3
RESERVED
DAC out
GPIO
RESERVED
Python Debug (MTSR) 3
Ground
GPS serial Port (TX) 3
Ground
RESERVED
GPIO
Ground
GPS serial Port (RX) 3
RESERVED
1 Pulse per Second signal 3
76
GPIO18
I/O
CMOS 2.8V
77
78
GND
RX_GPS_BI
N
GND
TX_GPS_BI
N
RESERVED
GND
GPS_ANT
GND_GPS
-
GPIO18 Configurable general purpose I/O pin/
DVI2_RX (Digital Voice Interface)
Ground
GPS serial Port (RX) - SIRF BINARY 3
-
Ground
GPS serial Port (TX) - SIRF BINARY 3
Power
CMOS 2.8V
-
RESERVED
Ground
GPS ANTENNA 3
GPS_ANTENNA GND 3
Power
79
80
81
82
83
84
3
-
100KΩ
pull
down
CMOS 2.8V
Power
Power
Power
CMOS 2.8V
Power
CMOS 2.8V
Power
Available only on GE863-GPS (in case of GE863-QUAD/PY/SIM it has to be considered RESERVED)
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GE863 Family Hardware User Guide
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NOTE:
The GE863 family Wireless Modules (GE863-GPS, GE863-PY, GE863-SIM and GE863QUAD) has one DVI port present on the system interface. For the GE863 Wireless
Modules, the DVI port can only be set to 2 if the digital audio functionality is to be
used. This is due to physical interface restrictions.
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4.2.
PINS Layout
TOP VIEW
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GE863 Family Hardware User Guide
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5.
Hardware Commands
5.1.
Turning ON the GE863
To turn the GE863 on, the pad ON# must be tied low for at least 1 second and then
released. A pulse duration less than 1 second should also start the power on
procedure, but this is not guaranteed.
The maximum current that can be drained from the ON# pad is 0,1 mA.
A simple circuit to do it is:
NOTE:
Do not use any pull up resistor on the ON# line, since it is internally pulled up. Using
pull up resistor may cause latch up problems on the GE863 power regulator and
improper power on/off of the module. The line ON# must be connected only in open
collector configuration.
In this document all the lines that are inverted, having active low signals, are labeled
with a name that ends with a "#" or with a bar over the name.
The GE863 turns fully on by supplying power to the Charge pad as well (as in a
module equipped with a battery on the VBATT pads).
TIP:
Monitor the hardware line PWRMON to check if the device has been powered on. The
device should be considered powered on 900ms after the line raised up.
PWRMON line rises up also when supplying power to the Charge pad.
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For example:
1- Let us assume you need to drive the ON# pad with a totem pole output of a +3/5 V
microcontroller (uP_OUT1):
2- Let us assume you need to drive the ON# pad directly with an ON/OFF button:
A flow chart with proper turn on procedure is detailed below:
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GE863 Family Hardware User Guide
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5.2.
Turning OFF the GE863
Turning off of the device can be done in two ways:
•
via AT command (see GE863 Software User Guide, AT#SHDN)
•
by tying low pin ON#
Either ways, the device issues a detach request to network informing that the device
will not be reachable any more.
To turn OFF the GE863 the pad ON# 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# pad.
The following flow chart shows the proper turnoff procedure:
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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.
5.3. Resetting the GE863
NOTE:
The concept of resetting the module differs from versions of the GE863. On GE863QUAD/PY/SIM modules, operating on the RESET# pin as described next will actually
reboot the module, giving place to what we’ll call an Hardware Unconditional
Restart(par 5.3.2), while on GE863-GPS it will shut the module down generating an
Hardware Unconditional Shutdown (par 5.3.1).
5.3.1. Hardware Unconditional Shutdown (for GE863-GPS only)
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 shut down the GE863-GPS, the pad RESET# must be tied low for
at least 200 milliseconds and then released.
The maximum current that can be drained from the RESET# pad is 0,15 mA.
A simple circuit to do it is:
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NOTE:
Do not use any pull up resistor on the RESET* line nor any totem pole digital output.
Using pull up resistor may cause latch up problems on the GE863-GPS power
regulator and improper functioning of the module. The RESET* line must be
connected in open collector configuration only.
TIP:
The unconditional hardware shutdown must be always implemented on the boards
and the software must use it as an emergency exit procedure.
A flow chart for this is detailed below:
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For example:
Let us assume you need to drive the RESET# pad with a totem pole output of a +3/5 V
microcontroller (uP_OUT2):
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5.3.2. Hardware Unconditional restart (GE863-QUAD/PY/SIM only)
WARNING:
The hardware unconditional Restart must not be used during normal operation of the
device since it does not detach the device from the network. It shall be kept as an
emergency exit procedure to be done in the rare case that the device gets stacked
waiting for some network or SIM responses.
To unconditionally reboot the GE863-QUAD/PY/SIM, the pad RESET# must be tied
low for at least 200 milliseconds and then released.
The maximum current that can be drained from the RESET# pad is 0,15 mA.
NOTE:
Do not use any pull up resistor on the RESET* line nor any totem pole digital output.
Using pull up resistor may bring to latch up problems on the GE863-QUAD/PY/SIM
power regulator and improper functioning of the module. The line RESET* must be
connected only in open collector configuration.
TIP:
The unconditional hardware restart must always be implemented on the boards and
the software must use it as an emergency exit procedure.
A simple circuit to do it is:
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In the following flow chart is detailed the proper restart procedure:
For example:
Let us assume you need to drive the RESET# pad with a totem pole output of a +3/5 V
microcontroller (uP_OUT2):
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6.
Power Supply
The power supply circuitry and board layout are a very important part in the full
product design and they strongly reflect on the product overall performances, hence
read carefully the requirements and the guidelines that will follow for a proper
design.
6.1.
Power Supply Requirements
POWER SUPPLY (SW release 7.02.xx4 or older)
Nominal Supply Voltage
3.8 V
Normal Operating Voltage Range
3.4 V÷ 4.20 V
POWER SUPPLY (SW release 7.03.x00
Nominal Supply Voltage
Normal Operating Voltage Range
Extended Operating Voltage Range
or newer)
3.8 V
3.4 V÷ 4.20 V
3.22 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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The following table is describing the power consumptions of the module:
GE863-QUAD/PY
Mode
SWITCHED OFF
Switched Off
IDLE mode
AT+CFUN=1
AT+CFUN=4
AT+CFUN=0 or =5
CSD TX and RX mode
GSM900 CSD PL5
DCS1800 CSD PL0
GPRS (class 10) 1TX
GSM900 PL5
DCS1800 PL0
GPRS (class 10) 2TX
GSM900 PL5
DCS1800 PL0
Average
(mA)
<26 uA
Mode description
Module supplied but Switched Off
19.0
18.2
Normal mode: full functionality of the module
Disabled TX and RX; module is not registered on the network
6.6
4.5
3.3
3.2
2.5
Paging Multiframe 2
Paging Multiframe 4
Paging Multiframe 6
Paging Multiframe 8
Paging Multiframe 9
237.3
223.8
GSM VOICE CALL
264,0
176,0
GPRS Sending data mode
473,8
307,8
GPRS Sending data mode
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The following table is describing the power consumptions of the module in case of
the GE863-GPS:
GE863-GPS
Average
(mA)
Mode
SWITCHED OFF
Switched Off
IDLE mode (GPSP=0)
AT+CFUN=1
AT+CFUN=4
AT+CFUN=0 or =5
IDLE mode (GPSP=1)
AT+CFUN=1
AT+CFUN=4
<30 uA
19.0
18.2
6.6
4.5
3.3
3.2
3.3
79.4
79.0
70.3
68.6
AT+CFUN=0 or =5
67.8
63.4
63.0
IDLE mode (GPSPS=2,1800)
11.5
AT+CFUN=0 or =5
10.0
CSD TX and RX mode
GSM900 CSD PL5
325.0
DCS1800 CSD PL0
302.2
GPRS (class 10) 1TX
GSM900 PL5
264,0
DCS1800 PL0
176,0
GPRS (class 10) 2TX
GSM900 PL5
473,8
DCS1800 PL0
307,8
Mode description
Module supplied but Switched Off
Normal mode: full functionality of the module
Disabled TX and RX; module is not registered on the network
Paging Multiframe 2
Paging Multiframe 4
Paging Multiframe 6
Paging Multiframe 8
Paging Multiframe 9
Normal mode: full functionality of the module
Disabled TX and RX; module is not registered on the network
Paging Multiframe 2
Paging Multiframe 4
Paging Multiframe 6
Paging Multiframe 8
Paging Multiframe 9
Paging Multiframe 2
Paging Multiframe 9
GSM VOICE CALL + GPS receiver active
GPRS Sending data mode
GPRS Sending data mode
RF transmission in GSM systems is not continuous, being packed into bursts at a
base frequency of about 216 Hz. The relative current peaks can be as high as about
2A. The power supply has to be designed in order to withstand these current peaks
without big voltage drops; this means that both the electrical design and the board
layout must be designed for this current flow.
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TIP:
The power supply electrical design must forecast a peak current output of at least 2A.
If the layout of the PCB is not properly designed, then a strong noise floor is
generated on the ground and the supply; this reflects on all the audio paths
producing an audible and annoying noise at 216 Hz; if the voltage drops, the
overwhelming peak current absorption might cause the device to even shutdown, as
a consequence of the supply voltage drop.
6.2.
Embodied Battery Charger
The battery charger is suited for 3.7V Li-Ion rechargeable battery (suggested capacity
500-1000mAH). The Charger needs only a CURRENT LIMITED power source input
and charges the battery directly through VBATT connector pins.
Battery charger input pin
CHARGE
Battery pins
VBATT, GND
Battery charger input voltage min
5.0 V
Battery charger input voltage typ
5.5 V
Battery charger input voltage max
7.0 V
Battery charger input current max
400mA
Battery type
Li-Ion rechargeable
NOTE:
If embodied battery charger is used, then a LOW ESR capacitor of at least 100μF
must be mounted in parallel to VBATT pin.
NOTE:
When power is supplied to the CHARGE pin, a battery must always be connected to
the VBATT pin of the GE863.
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6.3.
General Design Rules
The principal guidelines for the Power Supply Design embrace three different design
steps:
6.3.1.
•
the electrical design
•
the thermal design
•
the PCB layout
Electrical Design Guidelines
The electrical design of the power supply depends strongly on the power sources
where this power is drained. We distinguish them into three categories:
6.3.1.1.
•
+5V input (typically PC internal regulator output)
•
+12V input (typically automotive)
•
battery
+ 5V Input Source Power Supply Design Guidelines
•
The desired output for the power supply is 3.8V, hence there is not a big
difference between the input source and the desired output, and a linear
regulator can be used. A switching power supply is not suited because of
the low drop out requirements.
•
Using a linear regulator, a proper heat sink must 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 GE863. a 100μF
tantalum capacitor is usually suited.
•
Make sure the low ESR capacitor on the power supply output (usually a
tantalum one) is rated at least 10V.
•
A protection diode must be inserted close to the power input, in order to
save the GE863 from power polarity inversion.
An example of linear regulator with 5V input is:
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6.3.1.2.
+ 12V Input Source Power Supply Design Guidelines
•
The desired output for the power supply is 3.8V, due to the big difference
between the input source and the desired output; a linear regulator is not
suited and must not be used. A switching power supply is preferable
because of better efficiency especially with the 2A peak current load
represented by the GE863.
•
When using a switching regulator, a 500 kHz (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, cause the switching frequency could also
generate EMC interferences.
•
As far as PB batteries (as inside cars), the input voltage can rise up to
15,8V and this must be kept in mind when choosing components: all
components in the power supply must withstand this voltage.
•
A Bypass low ESR capacitor of adequate capacity must be provided in
order to cut the current absorption peaks, a 100μF tantalum capacitor is
usually suited.
•
Make sure the low ESR capacitor on the power supply output (usually a
tantalum one) is rated at least 10V.
•
For Car applications a spike protection diode must be inserted close to
the power input, in order to clean the supply from spikes.
•
A protection diode must be inserted close to the power input, in order to
save the GE863 from power polarity inversion. This can be the same diode
as for spike protection.
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An example of switching regulator with 12V input is in the below schematic (it is split
in 2 parts):
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6.3.1.3.
Battery Source Power Supply Design Guidelines
The desired nominal output for the power supply is 3.8V and the maximum voltage
allowed is 4.2V (4.5 V if using SW release 7.03.x00 or newer), hence a single 3.7V LiIon cell battery type is suited for supplying the power to the Telit GE863 module.
WARNING:
Do not use any Ni-Cd, Ni-MH, and Pb battery types directly connected with GE863.
Their use can lead to overvoltage on the GE863 and damage it. USE ONLY Li-Ion
battery types.
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 GE863-GPS and damage it.
•
A Bypass low ESR capacitor of adequate capacity must be provided in
order to cut the current absorption peaks. A 100μF tantalum capacitor is
usually suited.
•
Make sure the low ESR capacitor (usually a tantalum one) is rated at least
10V.
•
A protection diode must be inserted close to the power input, in order to
save the GE863 from power polarity inversion. Otherwise the battery
connector must 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.
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6.3.1.4.
Battery Charge Control Circuitry Design Guidelines
The charging process for Li-Ion Batteries can be divided into 4 phases:
•
qualification and trickle charging
•
fast charge 1 - constant current
•
final charge - constant voltage or pulsed charging
•
maintenance charge
The qualification process consists of a battery voltage measure, indicating roughly its
charge status. If the battery is deeply discharged, meaning its voltage is lower than
the trickle charging threshold, then charging must start slowly, possibly with a
current limited to the pre-charging process. The current must be kept very low with
respect to the fast charge value.
During trickle charging the voltage across the battery terminals rises; when it
reaches the fast charge threshold level the charging process goes into a fast charge
phase.
During the fast charge phase the process proceeds with a current limited for
charging; this current limit depends on the required time for completing the charge
and on battery pack capacity. During this phase the voltage across the battery
terminals still raises but at a lower rate. Once the battery voltage reaches its
maximum voltage the process goes into its third state: Final charging. The voltage
measure to change the process status into final charge is very important. It must be
ensured that the maximum battery voltage is never exceeded, otherwise the battery
may be damaged and even explode.
Moreover, for constant final chargers, the voltage phase (final charge) must not start
before the battery voltage has reached its maximum value, otherwise the battery
capacity will be slightly reduced.
The final charge can be of two different types: constant voltage or pulsed. GE863
uses constant voltage.
The constant voltage charge proceeds with a fixed voltage regulator (very accurately
set to the maximum battery voltage) and the current decreases while the battery is
becoming charged. When the charging current falls below a certain fraction of the
fast charge current value, then the battery is considered fully charged, the final
charge stops and eventually starts the maintenance.
The pulsed charge process has no voltage regulation, instead charge continues with
pulses. Usually the pulse charge works in the following manner: the charge is
stopped for some time, let us say few hundreds of ms, then the battery voltage will
be measured and when it drops below its maximum value a fixed time length
charging pulse is issued. As the battery approaches its full charge, the off time
becomes longer and the duty-cycle of the pulses decreases. The battery is
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considered fully charged when the pulse duty-cycle is less than a threshold value,
typically 10%, the pulse charge stops and eventually the maintenance starts.
The last phase is not properly a charging phase, since the battery at this point is fully
charged and the process may stop after the final charge. The maintenance charge
provides an additional charging process to compensate the charge leak typical of a
Li-Ion battery. It is done by issuing pulses with a fixed time length, again few
hundreds of ms, and a duty-cycle around 5% or less.
This last phase is not implemented in the GE863 internal charging algorithm so
once-charged battery is left discharging down to a certain threshold. It is cycled from
full charge to slight discharge even if the battery charger is inserted. This guarantees
that the remaining charge in the battery is a good percentage and that the battery is
not damaged by keeping it always fully charged (Li-Ion rechargeable batteries
usually deteriorate when kept fully charged).
Last but not least, in some applications, it is highly desired that the charging process
restarts when the battery is discharged and its voltage drops below a certain
threshold. This is typical for the GE863 internal charger.
As you can see, the charging process is not a trivial task to do; moreover all these
operations must start only if battery temperature is inside charging range, usually
5°C - 45°C.
NOTE:
For all the threshold voltages, inside the GE863 all thresholds are fixed in order to
maximize Li-Ion battery performances and do not need to be changed.
NOTE:
In this application the battery charger input current must be limited to less than
400mA. This can be done by using a current limited wall adapter as the power source.
NOTE:
When starting the charger from Module powered off the startup is in CFUN4; to
activate the normal mode a command AT+CFUN=1 has to be provided. There is also
the possibility to activate the normal mode using the ON_OFF* signal.
In this case, when HW powering off the module with the same line (ON_OFF*) and
having the charger still connected, the module goes back to CFUN4.
NOTE:
It is important having a 100ųF Capacitor to VBAT in order to avoid instability of the
charger circuit if the battery is accidentally disconnected during the charging activity.
The GE863-GPS measures the temperature of its internal component in order to
satisfy this last requirement. This not exactly the same as the battery temperature
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but in common use, the two temperatures must not differ too much and the charging
temperature range must be guaranteed.
6.3.2.
Thermal Design Guidelines
The thermal design for the power supply heat sink must be done with the following
specifications:
•
average current consumption during transmission @ max PWR level:
500mA
•
average current consumption during transmission @ min PWR level:
100mA
•
average current during Power Saving(AT+CFUN=5) 4mA
•
average current during idle (Power Saving disabled) 24mA
For GE863-GPS only:
•
average GPS section consumption during Power Saving: 1mA
•
average GPS section consumption during Tracking (Power Saving
disabled) 60mA
TIP:
The thermal design for the Power supply must be made keeping an average
consumption at the max transmitting level during calls of 500mA rms plus 60mA rms
for GPS in tracking mode.
NOTE:
The average consumption during transmissions depends on the power level at which
the device is requested to transmit by the network. The average current consumption
hence varies significantly.
Considering the very low current during idle, especially if the Power Saving function
is enabled, it is possible to consider from the thermal point of view that the device
absorbs current significantly only during calls.
If we assume that the device stays in transmission for short periods of time (let us
say few minutes) and then remains for quite a long time in idle (let us say one hour),
then the power supply has always the time to cool down between the calls. The heat
sink could be smaller than calculated for 500mA maximum RMS current. There
could even be a simple chip package (no heat sink).
Moreover, in average network conditions, the device is requested to transmit at a
lower power level than the maximum, hence the current consumption will be less
than 500mA (being usually around 150mA).
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For these reasons, the thermal design is rarely a concern and the simple ground
plane where the power supply chip is placed can be enough to ensure a good thermal
condition and avoid overheating.
Let’s consider the heat of the module during the transmission of 1W max during
CSD/VOICE calls and 2W max during class10 GPRS upload.
This generated heat will be mostly conducted to the ground plane under the GE863;
you must ensure that your application can dissipate it.
6.3.3.
Power Supply PCB Layout Guidelines
As seen on the electrical design guidelines the power supply must 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 power supply performances.
•
The Bypass low ESR capacitor must be placed close to the Telit GE863
power input pads or in the case the power supply is a switching. It can be
placed close to the inductor to cut the ripple provided by the PCB trace
from the capacitor. The GE863 is wide enough to ensure a dropless
connection even during 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 especially in order to save
power, but to avoid the voltage drops on the power line at the current
peaks frequency of 216 Hz. that the 216 Hz reflects 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 does not
have audio interface but only uses the data feature of the Telit GE863,
then this noise is not so disturbing and the power supply layout design can
be more forgiving.
•
The PCB traces to the GE863 and the Bypass capacitor must be wide
enough to ensure no significant voltage drops to 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
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power supply). This is done in order to reduce the radiated field (noise) at
the switching frequency (100-500 kHz usually).
6.3.4.
•
The use of a good common ground plane is suggested.
•
The placement of the power supply on the board must 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 must be kept separate from noise sensitive
lines such as microphone/earphone cables.
Parameters for ATEX Application
In order to integrate the Telit’s GE863 module into an ATEX application, the
appropriate reference standard IEC EN xx and integrations must be followed.
Below are listed parameters and useful information to integrate the module in your
application:


GE863-QUAD & GE 863-PY
•
Total capacity:
78.394 ųF
•
Total inductance: 10.163 ųH
GE863-GPS
•
Total capacity:
83.167 ųF
•
Total inductance: 10.264 ųH

No voltage upper than supply voltage is present in the module.

No step-up converters are present in the module.

In abnormal conditions, the maximum RF output power is up 34 dBm max for
few seconds.
For this particular application, we recommend the customer to involve TTSC (Telit
Technical Support Center) in the design phase of the application.
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7.
Antenna
The antenna connection and board layout design are the most important parts in the
full product design and they strongly reflect on the overall product performances.
Read carefully and follow the requirements and the guidelines for a proper design.
7.1.
GSM Antenna Requirements
As suggested on the Product Description the antenna and antenna line on PCB for a
Telit GE863 device must fulfill the following requirements:
Antenna Requirements
Frequency range
Bandwidth
Gain
Impedance
Input power
VSWR absolute max
VSWR recommended
Depending by frequency band(s) provided by the
network operator, the customer must use the
most suitable antenna for that/those band(s)
70 MHz in GSM850, 80 MHz in GSM900, 170 MHz in
DCS & 140 MHz PCS band
Gain < 3dBi
50 Ω
> 2 W peak power
≤ 10:1
≥ 2:1
When using the Telit GE863, since there is no antenna connector on the module, the
antenna must be connected to the GE863 through the PCB with the antenna pad.
In the case the antenna is not directly developed on the same PCB or directly
connected at the antenna pad of the GE863, a PCB line is needed in order to connect
with it or with its connector.
This line of transmission must fulfill the following requirements:
Antenna Line on PCB Requirements
Impedance
50 Ω
Max Attenuation
0,3 dB
No coupling with other signals allowed
Cold End (Ground Plane) of antenna must be equipotential to
the GE863 ground pins
Furthermore if the device is developed for the US market and/or Canada market, it
must comply to the FCC and/or IC approval requirements:
This device is to be used only for mobile and fixed application. The antenna(s) used
for this transmitter must be installed to provide a separation distance of at least 20
cm from all persons and must not be co-located or operating in conjunction with any
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other antenna or transmitter. End-Users must be provided with transmitter
operation conditions for satisfying RF exposure compliance. OEM integrators must
ensure that the end user has no manual instructions to remove or install the GE863
module.
Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed
operating configurations.
7.2.
7.3.
GSM Antenna - PCB Line Guidelines
•
Ensure that the antenna line impedance is 50 Ω.
•
Keep the antenna line on the PCB as short as possible, since the antenna
line loss must be less than 0,3 dB.
•
Antenna line must have uniform characteristics, constant cross section,
avoid meanders and abrupt curves.
•
Keep, if possible, one layer of the PCB used only for the Ground plane;
•
Surround (on the sides, over and under) the antenna line on PCB with
Ground, avoid having other signal tracks facing directly the antenna line
track.
•
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 GE863 antenna line.
•
Keep the antenna line far away from the GE863 power supply lines.
•
If you have EM noisy devices around the PCB hosting the GE863, 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 of GE863, by using a
strip-line on the superficial copper layer for the antenna line, the line
attenuation will be lower than a buried one.
GSM Antenna - Installation Guidelines
•
Install the antenna in a place covered by the GSM signal.
•
The Antenna must be installed to provide a separation distance of at least
20 cm from all persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
•
Antenna must not be installed inside metal cases.
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•
7.4.
Antenna must be installed also according Antenna manufacturer
instructions.
GPS Antenna Requirements
The GE863-GPS module is not provided with an internal LNA amplifier. The use of an
active antenna is important to achieve a good performance.
The module is provided of an Antenna supply circuit with the following
characteristics:
7.4.1.
•
supply voltage referred to VBATT (Must accept values from 3.4 to 4.2 V
DC)
•
supply enable controlled internally by the BB
•
current measurement circuit (readable also with AT commands)
•
voltage measurement circuit (readable also with AT commands)
•
HW Protection for antenna short circuit (if consumption exceeds 40mA)
Combined GPS Antenna
The use of combined GPS antennas is NOT recommended; this solution could
generate an extremely poor GPS reception and also the combination antenna
requires additional diplexer and adds a loss in the RF route.
7.4.2.
Linear and Patch GPS Antenna
Using this type of antenna introduces at least 3 dB of loss if compared to a circularly
polarized (CP) antenna. Having a spherical gain response instead of a hemispherical
gain response could aggravate the multipath behaviour & create poor position
accuracy.
7.4.3.
LNA and Front End Design Considerations
LNA gain must be between 12 dB and 26 dB (assumes a patch antenna). - This
assumes the patch used has >3 dBic of gain.
Linear antenna implementation must consider a minimum of ~14.5 dB of LNA gain.
Excessive LNA gain (>27 dB) can introduce jamming spurs, degrade 3IP, and saturate
the receiver.
The supply voltage most accept the range between 3.4 to 4.2 V DC
In highly integrated environments rich with potential interference, SiRF suggests
design implementations with PRE filters.
The module’s GPS input is already provided of a SAW filter.
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As suggested on the Product Description the external active antenna for a Telit
GE863-GPS device must fulfill the following requirements:
Antenna Requirements
Frequency range
Bandwidth
Gain
Impedance
Amplification
Supply voltage
Current
consumption
1575.42 MHz (GPS L1)
± 1.023 MHz
1.5 dBi < Gain < 4.5 dBi
50Ω
Typical 25dB (max 27dB)
Must accept from 3 to 5 V DC
Typical 20mA (40 mA max)
When using the Telit GE863-GPS, since there is no antenna connector on the module,
the antenna must be connected to the GE863-GPS through the PCB with the antenna
pad.
In the case that the antenna is not directly developed on the same PCB, hence
directly connected at the antenna pad of the GE863-GPS, then a PCB line is needed in
order to connect with it or with its connector.
This line of transmission must fulfill the following requirements:
Antenna Line on PCB Requirements
Impedance
50Ω
No coupling with other signals allowed
Cold End (Ground Plane) of antenna must be equipotential to
the GE863-GPS ground pins
Furthermore if the device is developed for the US and/or Canada market, it must
comply with the FCC and/or IC approval requirements:
This device is to be used only for mobile and fixed application.
7.5.
GPS Antenna - PCB Line Guidelines
•
Ensure that the antenna line impedance is 50Ω.
•
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 the sides, over and under) the antenna line on PCB with
Ground, avoid having other signal tracks facing directly the antenna line of
track.
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7.6.
•
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 GE863-GPS antenna line.
•
Keep the antenna line far away from the GE863-GPS power supply lines.
•
Keep the antenna line far away from the GE863-GPS GSM RF lines.
•
If you have EM noisy devices around the PCB hosting the GE863-GPS,
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 of GE863-GPS, use a
strip-line on the superficial copper layer for the antenna line. The line
attenuation will be lower than a buried one.
GPS Antenna - Installation Guidelines
•
The GE863-GPS due to its characteristics of sensitivity is capable to
perform a Fix inside the buildings. (In any case the sensitivity could be
affected by the building characteristics i.e. shielding).
•
The Antenna must not be co-located or operating in conjunction with any
other antenna or transmitter.
•
Antenna must not be installed inside metal cases.
•
Antenna must be installed also according Antenna manufacturer
instructions.
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7.7.
Logic Level Specifications
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic
levels. The following table shows the logic level specifications used in the Telit GE863
interface circuits:
Absolute Maximum Ratings -Not Functional
Parameter
Min
Max
Input level on any
-0.3V
digital pin when on
Input voltage on
-0.3V
analog pins when on
+3.6V
+3.0 V
Operating Range - Interface Levels (2.8V CMOS)
Level
Min
Max
Input high level
2.1V
3.3V
Input low level
Output high level
Output low level
0V
2.2V
0V
0.5V
3.0V
0.35V
For 1,8V signals:
Operating Range - Interface Levels (1.8V CMOS)
Level
Min
Max
Input high level
1.6V
2.2V
Input low level
Output high level
Output low level
0V
1,65V
0V
0.4V
2.2V
0.35V
Current Characteristics
Level
Typical
Output Current
1mA
Input Current
1ųA
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7.7.1.
Reset Signal
Signal
RESET
Function
Phone reset
I/O
I
BGA Ball
47
RESET is used to reset the GE863 modules. Whenever this signal is pulled low, the
GE863 is reset. When the device is reset it stops any operation in progress. After the
release of the reset, GE863-GPS is unconditionally shut down (in case of GE863QUAD/PY/SIM the reset line perform an unconditional restart), without doing any
detach operation from the network where it is registered. This behavior is not a
proper shut down because GSM devices are requested to issue a detach request on
turn off. For this reason the Reset signal must not be used to normally, shutting
down the device, but only as an emergency exit in the rare case the device remains
stuck waiting for some network response.
NOTE:
Do not use this signal to power off the GE863. Use the ON/OFF signal to perform this
function or the AT#SHDN command.
The RESET is internally controlled at start-up to achieve always a proper power-on
reset sequence. There is no need to control this pin at start-up; it may only be used
to reset a device if it is not responding to any command.
Reset Signal Operating Levels:
Signal
RESET Input high
RESET Input low
Min
2.0V*
0V
Max
2.2V
0.2V
* this signal is internally pulled up so the pin can be left floating if not used.
If unused, this signal may be left unconnected. If used, then it must always be
connected with an open collector transistor to permit to the internal circuitry the
power on reset and under voltage lockout functions.
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8.
Serial Ports
8.1.
GE863-GPS Serial Ports
The serial port on the Telit GE863-GPS is the core of the interface between the
module and OEM hardware. 4 serial ports are available on the module:
8.2.
•
MODEM SERIAL PORT
•
MODEM SERIAL PORT 2 (GPS CONTROL PORT)
•
GPS SERIAL PORT A (SIRF BINARY)
•
GPS SERIAL PORT B (NMEA)
GE863-QUAD/PY/SIM Serial Ports
Several configurations can be designed for the serial port on the OEM hardware, but
the most common are:
•
RS232 PC com port
•
microcontroller UART @ 2.8V - 3V (Universal Asynchronous Receive
Transmit)
•
microcontroller UART@ 5V or other voltages different from 2.8V
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8.3.
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 @ 2.8V - 3V (Universal Asynchronous Receive
Transmit)
•
microcontroller UART@ 5V or other voltages different from 2.8V
Depending from the type of serial port on the OEM hardware a level translator circuit
may be needed to make the system work. The only configuration that does not need a
level translation is the 2.8V UART.
The serial port on the GE863 is a +2.8V UART with all the 7 RS232 signals. It differs
from the PC-RS232 in the signal polarity (RS232 is reversed) and levels. The levels
for the GE863 UART are the CMOS levels:
Absolute Maximum Ratings -Not Functional
Parameter
Min
Max
Input level on any
-0.3V
+3.6V
digital pad when on
Input voltage on
-0.3V
+3.0 V
analog pads when on
Operating Range - Interface Levels (2.8V CMOS)
Level
Min
Max
Input high level VIH
2.1V
3.3V
Input low level VIL
0V
0.5V
Output high level VOH 2.2V
3.0V
Output low level VOL 0V
0.35V
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The signals of the GE863 serial
RS232
GE863
Pin
Signal
Pad
Number
Number
1
DCD 42
dcd_uart
2
RXD 38
tx_uart
3
TXD 37
rx_uart
4
DTR 39
dtr_uart
5
8-17-28GND
36-45-4850-56
6
DSR 43
dsr_uart
7
RTS 40
rts_uart
8
CTS 41
cts_uart
9
RI 44
ri_uart
port are:
Name
Usage
Data Carrier Detect
Output from the GE863 that indicates the
carrier presence
Output transmit line of GE863 UART
Transmit line *see
Note
Receive line *see
Input receive of the GE863 UART
Note
Data Terminal Ready Input to the GE863 that controls the DTE
READY condition
Ground
ground
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
Output from the GE863 that indicates the
module is ready
Input to the GE863 that controls the
Hardware flow control
Output from the GE863 that controls the
Hardware flow control
Output from the GE863 that indicates the
incoming call condition
NOTE:
According to V.24, RX/TX signal names are referred to the application side, therefore
on the GE863 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 GE863
serial port and vice versa for RX.
TIP:
For a minimum implementation, only the TXD and RXD lines can be connected, the
other lines can be left open provided a software flow control is implemented.
TIP:
In order to avoid noise or interferences on the RXD lines it is suggested to add a pull
up resistor (100KΩ to 2.8V)
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8.4.
GE863-GPS Secondary Ports
8.4.1.
Modem Serial Port 2 (GPS Control)
This port is used to control the GPS part by the GSM part.
It is available on the following pins:
PIN #
25
26
NAME
TX_TRACE
RX_TRACE
DESCRIPTION
TX Data for GPS control
RX Data for GPS control
TYPE
CMOS 2.8V
CMOS 2.8V
The typical integration requires connecting these pins to GPS serial port A:
PIN #
25
26
8.4.2.
NAME
TX_TRACE
RX_TRACE
NAME
RX_GPS_BIN
TX_GPS_BIN
PIN#
78
80
GPS Serial Port A (SIRF Binary)
This port is carrying out the GPS navigation data in SIRF BINARY format. The default
configuration is 57600 bps, 8, n, 1
It is available on the following pins:
PIN #
78
80
NAME
RX_GPS_BIN
TX_GPS_BIN
DESCRIPTION
GPS RX Data (Sirf Binary)
GPS TX Data (Sirf Binary)
TYPE
CMOS 2.8V
CMOS 2.8V
The typical integration requires connecting these pins to MODEM serial port 2.
8.4.3.
GPS Serial Port B (NMEA)
This port is carrying out the GPS navigation data in NMEA 0183 format. The default
configuration is 4800 bps, 8, n, 1
It is available on the following pins:
PIN #
68
73
NAME
TX_GPS
RX_GPS
DESCRIPTION
GPS TX Data (NMEA)
GPS RX Data (NMEA)
TYPE
CMOS 2.8V
CMOS 2.8V
GPS RX Lines and TX lines may need a dual supply isolation buffer like an FXLP34 to
avoid CMOS high states while in POWER SAVING.
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8.5.
GE863-QUAD/PY/SIM Secondary Port
8.5.1.
Modem Serial Port 2 (Python Debug)
It is available on the following pins:
PIN #
25
26
8.6.
NAME
TX_TRACE
RX_TRACE
DESCRIPTION
TX Data
RX Data
TYPE
CMOS 2.8V
CMOS 2.8V
RS232 Level Translation
In order to interface the Telit GE863 with a PC COM port or a RS232 (EIA/TIA-232)
application a level translator is required. This level translator must
•
invert the electrical signal in both directions
•
change the level from 0/3V to +15/-15V
Actually, the RS232 UART 16450, 16550, 16650 & 16750 chipsets accept signals with
lower levels on the RS232 side (EIA/TIA-562), allowing for a lower voltage-multiplying
ratio on the level translator. Note that the negative signal voltage must be less than
0V and hence some sort of level translation is always required.
The simplest way to translate the levels and invert the signal is by using a single chip
level translator. There are a multitude of them, differing in the number of drivers and
receivers and the levels (be sure to get a true RS232 level translator not a RS485 or
other standards).
By convention the driver is the level translator from the 0-3V UART level to the RS232
level, while the receiver is the translator from RS232 level to 0-3V UART.
In order to translate the whole set of control lines of the UART you will need:
•
5 driver
•
3 receiver
NOTE:
The digital input lines working at 2.8VCMOS have an absolute maximum input voltage
of 3,75V; therefore the level translator IC must not be powered by the +3.8V supply of
the module. Instead it must be powered from a +2.8V / +3.0V (dedicated) power
supply.
This is because this way the level translator IC outputs on the module side (i.e. GE863
inputs) will work at +3.8V interface levels, stressing the module inputs at its
maximum input voltage.
This can be acceptable for evaluation purposes, but not on production devices.
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NOTE:
In order to be able to do in circuit reprogramming of the GE863 firmware, the serial
port on the Telit GE863 must be available for translation into RS232 and either it is
controlling device must be placed into tristate, disconnected or as a gateway for the
serial data when module reprogramming occurs.
Only RXD, TXD, GND and the on/off module turn on pad are required to the
reprogramming of the module, the other lines are unused.
All applicators must include in their design a way reprogramming the GE863.
An example of level translation circuitry of this kind is:
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The RS232 serial port lines are usually connected to a DB9 connector with the
following layout:
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8.7.
5V UART Level Translation
If the OEM application uses a microcontroller with a serial port (UART) that works at
a voltage different from 2.8 - 3V, then a circuitry has to be provided to adapt the
different levels of the two set of signals. As for the RS232 translation, there are a
multitude of single chip translators. For example a possible translator circuit for a 5V
TRANSMITTER/RECEIVER can be:
TIP:
This logic IC for the level translator and 2.8V pull-ups (not the 5V one) can be
powered directly from VAUX line of the GE863. Note that the TC7SZ07AE has open
drain output, therefore the resistor R2 is mandatory.
NOTE:
The UART input line TXD (rx_uart) of the GE863 is NOT internally pulled up with a
resistor, so there may be the need to place an external 47KΩ pull-up resistor. Either
the DTR (dtr_uart) or RTS (rts_uart) input lines are not pulled up internally, so an
external pull-up resistor of 47KΩ may be required.
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A power source of the internal interface voltage corresponding to the 2.8VCMOS high
level is available at the VAUX pin.
A maximum of 9 resistors of 47KΩ pull-up can be connected to the VAUX pin,
provided no other devices are connected to it and the pulled-up lines are GE863 input
lines connected to open collector outputs in order to avoid latch-up problems on the
GE863.
NOTE:
The input lines working at 2.8VCMOS can be pulled-up with 47KΩ resistors that can
be connected directly to the VAUX line provided (they are connected as in this
example).
It is important to consider that the added circuit must have consumption lower than
1mA.
In case of reprogramming the module the use of the RESET line has to be considered
to start the activity correctly.
The preferable configuration is having an external supply for the buffer.
Care must be taken to avoid latch-up on the GE863 and the use of this output line to
power electronic devices must be avoided, especially for devices that generate spikes
and noise such as switching level translators, micro controllers, failure in any of
these conditions can severely compromise the GE863 functionality.
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9.
Audio Section Overview
The Baseband chip was developed for the cellular phones, which needed two
separated amplifiers both in RX and in TX section.
A couple of amplifiers had to be used with internal audio transducers while the other
couple of amplifiers had to be used with external audio transducers.
To distinguish the schematic signals and the Software identifiers, two different
definitions were introduced, with the following meaning:
•
internal audio transducers  HS/MT (from HandSet or MicroTelephone )
•
external audio transducers  HF
(from HandsFree )
Actually the acronyms have not the original importance.
In other words this distinction is not necessary, being the performances between the
two blocks like the same.
Only if the customer needs higher output power to the speaker , he has a constraint.
Otherwise the choice could be done in order to overcome the PCB design difficulties.
For these reasons we have not changed the HS and HF acronyms, keeping them in
the Software and on the schematics.
The Base Band Chip of the GE863 Telit Module maintains the same architecture.
For more information refer to Telit document :
“80000NT10007a Audio Settings Application Note“.
9.1.
Selection mode
Only one block can be active at a time , and the activation of the requested audio
path is done via hardware by AXE line or via software by AT#CAP command .
Moreover the Sidetone functionality could be implemented by the amplifier fitted
between the transmit path and the receive path, enabled at request in both modes.
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Audio Section Block Diagram
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9.2.
Electrical Characteristics
TIP: Being the microphone circuitry the more noise sensitive, its design and layout
must be done with particular care. Both microphone paths are balanced and the OEM
circuitry must be balanced designed to reduce the common mode noise typically
generated on the ground plane. However the customer can use the unbalanced
circuitry for particular application.
9.2.1.
Input Lines Characteristics
“MIC_MT” and “MIC_HF” differential microphone paths
Line Coupling
AC*
Line Type
Balanced
Coupling capacitor
≥ 100nF
Differential input resistance
Differential input voltage
50KΩ
≤ 1,03Vpp @ MicG=0dB
(*) WARNING : AC means that the signals from the microphone have to be
connected to input lines of the module through capacitors which value has to
be ≥ 100nf. not respecting this constraint, the input stages will be damaged.
WARNING: when particular OEM application needs a Single Ended Input
configuration, it is forbidden connecting the unused input directly to Ground,
but only through a 100nF capacitor. Don’t forget that in Single Ended configuration
the useful input signal will be halved.
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9.2.2.
Output Lines Characteristics
TIP:
We suggest driving the load differentially from both output drivers, thus the output
swing will double and the need for the output coupling capacitor avoided. However if
particular OEM application needs also a Single Ended circuitry can be implemented,
but the output power will be reduced four times.
The OEM circuitry shall be designed to reduce the common mode noise typically
generated on the ground plane and to get the maximum power output from the
device (low resistance tracks).
WARNING:
The loads are directly connected to the amplifier outputs when in Differential
configuration, through a capacitor when in Single Ended configuration. Using Single
Ended configuration, the unused output line must be left open. Not respecting this
constraint, the output stage will be damaged.
TIP :
Remember that there are slightly different electrical performances between the two
internal audio amplifiers:
• the “Ear_MT” lines can directly drive a 16 Ω load at –12dBFS (**) in
Differential configuration
• the “Ear_HF” lines can directly drive a 16 Ω load in Differential or Single Ended
configurations
• There is no difference if the amplifiers drive an external amplifier
(**) 0dBFS is the normalized overall Analog Gain for each Output channel equal to
3,7Vpp differential
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“EAR_MT” Output Lines
line coupling
output load resistance
internal output resistance
signal bandwidth
AC single-ended
DC differential
≥ 14 Ω
4 Ω (typical)
150 - 4000 Hz @ -3 dB
max. differential output voltage 1.31 Vrms (typical, open circuit)
differential output voltage
volume increment
volume steps
328mVrms /16 Ω /@ -12dBFS
2 dB per step
10
“EAR_HF” Output Lines
line coupling:
output load resistance :
internal output resistance:
signal bandwidth:
AC single-ended
DC differential
≥ 14 Ω
4 Ω (>1,7 Ω)
150 - 4000 Hz @ -3 dB
max. differential output
voltage
max. S.E. output voltage
1.31 Vrms (typical, open circuit)
volume increment
2 dB per step
volume steps
10
656 mVrms (typical, open circuit)
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10.
General Purpose I/O
The general purpose I/O pads can be configured to act in three different ways:
•
input
•
output
•
alternate function (internally controlled)
The following GPIO are available on the GE863:
Ball
Signal
I/O
34
GPIO1
I/O
33
GPIO2
I/O
55
GPIO3
I/O
Function
Type
GPIO01 Configurable
GPIO
GPIO02 Configurable
GPIO
GPIO03 Configurable
GPIO
CMOS
2.8V
CMOS
2.8V
CMOS
2.8V
Input /
Output
Current
1ųA /
1mA
1ųA /
1mA
1ųA /
1mA
Default
State
ON_OFF
state
INPUT
0
INPUT
0
INPUT
1
State
During
Reset
Note
Alternate
function (JDR)
1
47K Pull Up
4.7K Pull Up
Alternate
function (RF
Transmission
Control)
Alternate
function
(RFTXMON)
Alternate
function
(ALARM)
Alternate
function
(BUZZER)
32
GPIO4
I/O
GPIO04 Configurable
GPIO
CMOS
2.8V
1ųA /
1mA
INPUT
1
53
GPIO5
I/O
GPIO05 Configurable
GPIO
CMOS
2.8V
1ųA /
1mA
INPUT
0
54
GPIO6
I/O
GPIO06 Configurable
GPIO
CMOS
2.8V
1ųA /
1mA
INPUT
fig. 01
51
GPIO7
I/O
GPIO07 Configurable
GPIO
CMOS
2.8V
1ųA /
1mA
INPUT
0
6
GPIO8
I/O
I/O
INPUT
0
4
GPIO10
I/O
INPUT
0
3
GPIO11
I/O
INPUT
1
1
4.7K Pull Up
2
GPIO12
I/O
INPUT
1
1
47K Pull Up
1
GPIO13
I/O
INPUT
0
60
GPIO14
I/O
INPUT
0
71
GPIO15
I/O
1ųA /
1mA
1ųA /
1mA
1ųA /
1mA
1ųA /
1mA
1ųA /
1mA
1ųA /
1mA
1ųA /
1mA
1ųA /
1mA
0
GPIO9
CMOS
2.8V
CMOS
2.8V
CMOS
2.8V
CMOS
2.8V
CMOS
2.8V
CMOS
2.8V
CMOS
2.8V
CMOS
2.8V
INPUT
5
GPIO08 Configurable
GPIO
GPIO09 Configurable
GPIO
GPIO10 Configurable
GPIO
GPIO11 Configurable
GPIO
GPIO12 Configurable
GPIO
GPIO13 Configurable
GPIO
GPIO14 Configurable
GPIO
GPIO15 Configurable
GPIO
INPUT
0
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1
HIGH
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Ball
Signal
I/O
64
GPIO16
I/O
59
GPIO17
I/O
76
GPIO18
I/O
Function
Type
GPIO16 Configurable
GPIO
GPIO17 Configurable
GPIO
GPIO18 Configurable
GPIO
CMOS
2.8V
CMOS
2.8V
CMOS
2.8V
Input /
Output
Current
1ųA /
1mA
1ųA /
1mA
1ųA /
1mA
Default
State
ON_OFF
state
INPUT
0
INPUT
0
INPUT
0
State
During
Reset
Note
Input pads can only be read and report the digital value (high or low) present on the
pad at the read time; output pads can only be written or queried and set the value of
the pad output; an alternate function pad is internally controlled by the GE863
firmware and acts depending on the function implemented.
Not all GPIO pads support all these three modes:
•
GPIO1, GPIO3, GPIO8 to GPIO18 support both input and output mode but
not Alternate function.
•
GPIO2 supports all three modes and can be input, output, Jamming Detect
Output (Alternate function)
•
GPIO4 supports all three modes and can be input, output, RF
Transmission Control (Alternate function)
•
GPIO5 supports all three modes and can be input, output, RFTX monitor
output (Alternate function)
•
GPIO6 supports all three modes and can be input, output, alarm output
(Alternate function)
•
GPIO7 supports all three modes and can be input, output, buzzer output
(Alternate function)
All GPIO pads are 2.8V CMOS signals and their interface levels are the same
specified in the paragraph 6.
Figure 01
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10.1.
GPIO Logic Levels
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels.
The following table shows the logic level specifications used in the GE863 interface
circuits:
Absolute Maximum Ratings - Not Functional
Parameter
Min
Input level on any
-0.3V
digital pin when on
Input voltage on
-0.3V
analog pins when on
Max
+3.6V
+3.0 V
Operating Range - Interface Levels (2.8V CMOS)
Level
Min
Max
Input high level
2.1V
3.3V
Input low level
Output high level
Output low level
0V
2.2V
0V
0.5V
3.0V
0.35V
For 1.8V signals:
Operating Range - Interface Levels (1.8V CMOS)
Level
Min
Max
Input high level
1.6V
2.2V
Input low level
Output high level
Output low level
0V
1,65V
0V
0.4V
2.2V
0.35V
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10.2.
Using a GPIO Pad as Input
The GPIO pads, when used as inputs, can be connected to a digital output of another
device and report its status, provided this device has interface levels compatible with
the 2.8V CMOS levels of the GPIO.
If the digital output of the device were to be connected with the GPIO input pad had
interface levels different from the 2.8V CMOS, then it could be buffered with an open
collector transistor with a 47K pull up to 2.8V.
10.3.
Using a GPIO Pad as Output
The GPIO pads, when used as outputs, can drive 2.8V CMOS digital devices or
compatible hardware. When set as outputs, the pads have a push-pull output and
VDD
Q1
GPIO7
Q2
therefore the pull-up resistor may be omitted.
The illustration below shows the base circuit of a push-pull stage:
10.4.
Using the RF Transmission Control GPIO4
The GPIO4 pin, when configured as RF Transmission Control Input, permits to disable
the Transmitter when the GPIO is set to Low by the application.
10.5.
Using the RFTXMON Output GPIO5
The GPIO5 pin, when configured as RFTXMON Output, is controlled by the GE863
module and rises when the transmitter is active and fall after the transmitter activity
is completed.
For example, if a call is started, the line will be HIGH during all the conversation and
it will be again LOW after hanged up.
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The line rises up 300ms before first TX burst and becomes LOW again from 500ms to
1sec after last TX burst.
10.6.
Using the Alarm Output GPIO6
The GPIO6 pad, when configured as Alarm Output, is controlled by the GE863 module
and will rise when the alarm starts and fall after the issue of a dedicated AT
command.
This output can be used to power up the GE863 controlling microcontroller or
application at the alarm time, giving you the possibility to program a timely system
wake-up to achieve some periodic actions and completely turn off either the
application, or the GE863 during sleep periods, dramatically reducing the sleep
consumption to few μA.
NOTE:
During RESET the line is set to HIGH logic level.
In battery-powered devices this feature will greatly improve the autonomy of the
device.
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10.7.
Using the Buzzer Output GPIO7
As Alternate Function, the GPIO7 is controlled by the firmware that depends on the
function implemented internally.
This setup always places the GPIO7 pin in OUTPUT direction and the corresponding
function must be activated properly by AT#SRP command (refer to AT commands
specification).
In this case, the dummy value for the pin state can also be both “0” or “1”.
•
send the command AT#GPIO=7, 1, 2<cr>:
•
wait for response OK
•
send the command AT#SRP=3
The GPIO7 pin will be set as Alternate Function pin with its dummy logic status set to
HIGH value.
The "Alternate function” permits your application to easily implement Buzzer feature
with some small hardware extension of your application as shown in the next sample
figure.
NOTE:
To correctly drive a buzzer, a driver must be provided; its characteristics depend on
the Buzzer and to get these pieces of info, contact your buzzer vendor.
TR2
SMBT2907A
+V buzzer
R1
4,7K
D1
D1N4148
C1
33pF
+
-
R2
1K
GPIO7
TR1
BCR141W
Example of Buzzer’s driving circuit.
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10.8.
Magnetic Buzzer Concepts
10.8.1.
Short Description
A magnetic Buzzer is a sound-generating device with a coil located in the magnetic
circuit consisting of a permanent magnet, an iron core, a high permeable metal disk
and a vibrating diaphragm.
Drawing of the Magnetic Buzzer.
The disk and diaphragm are attracted to the core by the magnetic field. When an
oscillating signal is moved through the coil, it produces a fluctuating magnetic field
which vibrates the diaphragm at a frequency of the drive signal. Thus the sound is
produced relative to the frequency applied.
Diaphragm movement.
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10.8.2.
Frequency Behavior
The frequency behavior represents the effectiveness of the reproduction of the
applied signals. Because performance is related to a square driving waveform
(whose amplitude varies from 0V to Vpp), if you modify the waveform (e.g. from
square to sinus) the frequency response will change.
10.8.3.
Power Supply Influence
Applying a signal whose amplitude is different from that suggested by the
manufacturer, the performance change following the rule “if resonance frequency fo
increases, amplitude decreases”.
Because resonance frequency depends on acoustic design, by lowering the
amplitude of the driving signal the response bandwidth tends to become narrow, and
vice versa.
Summarizing:
Vpp ↑  fo ↓
Vpp ↓ fo ↑
WARNING:
It is very important to respect the sense of the applied voltage: never apply to the "-"
pin a voltage more positive than the "+" pin: if this happens, the diaphragm vibrates
in the opposite direction with a high probability to be expelled from its physical
position. This damages the device permanently.
The risk is that the fo could easily fall outside of new bandwidth; consequently the
SPL could be much lower than the expected.
10.8.4.
Working Current Influence
In the component data sheet you will find the value of MAX CURRENT: this
represents the maximum average current that can flow at nominal voltage without
current limitation. In other words it is not the peak current, which could be twice or
three times higher. If driving circuitry does not support these peak values, the SPL
will never reach the declared level or the oscillations will stop.
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10.9.
Using the Temperature Monitor Function
10.9.1.
Short Description
The Temperature Monitor is a function of the module that permits to control its
internal temperature and if properly set (see the #TEMPMON command on AT
Interface guide) it raises to High Logic level a GPIO when the maximum temperature
is reached.
10.9.2.
Allowed GPIO
The AT#TEMPMON set command could be used with one of the following GPIO:
Ball
Signal
34
GPIO 01
6
GPIO 08
5
GPIO 09
4
GPIO 10
1
GPIO 13
60
GPIO 14
71
GPIO 15
64
GPIO 16
59
GPIO 17
76
GPIO 18
Function
GPIO01 Configurable
GPIO
GPIO08 Configurable
GPIO
GPIO09 Configurable
GPIO
GPIO10 Configurable
GPIO
GPIO13 Configurable
GPIO
GPIO14 Configurable
GPIO
GPIO15 Configurable
GPIO
GPIO16 Configurable
GPIO
GPIO17 Configurable
GPIO
GPIO18 Configurable
GPIO
Type
Input /
Output
Current
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
Note
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The set command could be used also with one of the following GPIO but in that case
the alternate function is not usable:
Ball Signal
33
GPIO 02
53
GPIO 05
51
GPIO 07
Function
GPIO02 Configurable
GPIO
GPIO05 Configurable
GPIO
GPIO07 Configurable
GPIO
Type
Input /
Output
Current
Note
CMOS 2.8V
1ųA / 1mA
Alternate function (JDR)
CMOS 2.8V
1ųA / 1mA
CMOS 2.8V
1ųA / 1mA
Alternate function
(RFTXMON)
Alternate function
(BUZZER)
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10.10.
Indication of Network Service Availability
The STAT_LED pin status shows information on the network service availability and
Call status. In the GE863 modules, the STAT_LED needs an external transistor to
drive an external LED. Because of the above, the status indicated in the following
table is reversed with respect to the pin status.
LED status
Device Status
Permanently off
Device off
Fast blinking (Period 1s, Ton 0,5s)
Slow blinking (Period 3s, Ton 0,3s)
Net search / Not registered /
turning off
Registered full service
Permanently on
a call is active
A schematic example could be:
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11.
RTC and Auxiliary Supply
11.1.
RTC Bypass Out
The VRTC pin brings out the Real Time Clock supply, which is separate from the rest
of the digital part, allowing only RTC going on when all the other parts of the device
are off. A backup capacitor can be added to this power output in order to increase the
RTC autonomy during power off of the battery. NO Devices must be powered from
this pin.
11.2.
VAUX1 Power Output
A regulated power supply output is provided in order to supply small devices from
the module. This output is active when the module is ON and goes OFF when the
module is shut down. The operating range characteristics of the supply are:
Operating Range - VAUX1 power supply - GE863-GPS
Min
Typical
Max
Output voltage
2.75V
2.85V
Output current
Output bypass capacitor
(inside the module)
2.95V
50mA
2.2μF
Operating Range - VAUX1 power supply - GE863-QUAD/PY/SIM
Min
Typical
Max
Output voltage
Output current
Output bypass capacitor
(inside the module)
2.75V
2.85V
2.95V
100mA
2.2μF
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12.
PPS GPS Output (GE863-GPS only)
12.1.
Description
The Time Mark output 1PPS provides a one pulse-per-second signal to the user
specific application. The 1PPS pulse is available at any time as soon as a fix is done.
This signal is a positive logic, CMOS level output pulse that transitions from logic
'low' condition to logic 'high' at a 1 Hz rate.
12.2.
Pulse Characteristics
The signal is available on BGA Ball # 75 on GE863-GPS and on pin 26 of PL104 on
EVK2 Adapter board (CS1151).
Type:
Output CMOS 2.8V
Duration:
Typically 1us
Pull up/ down:
Internal 100KΩ Pull down
NOTE:
The signal is available only when the receiver provides a valid Navigation solution.
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13.
DAC and ADC section
13.1.
DAC Converter
13.1.1.
Description
The GE863 module provides a Digital to Analog Converter. The signal (named
DAC_OUT) is available on BGA Ball #63 of the GE863 module and on pin 17 of PL104
on EVK2 Board (CS1151).
The on board DAC is a 10 bit converter, able to generate an analogue value based on
a specific input in the range from 0 up to 1023. However, an external low-pass filter
is necessary.
Voltage range (filtered)
Range
Min
0
0
Max
2,6
1023
Units
Volt
Steps
The precision is 10 bits, so if we consider that the maximum voltage is 2V, the
integrated voltage could be calculated with the following formula:
Integrated output voltage = 2 * value / 1023
DAC_OUT line must be integrated (for example with a low band pass filter) in order to
obtain an analog voltage.
13.1.2.
Enabling DAC
An AT command is available to use the DAC function. The command is
AT#DAC[=<enable>[,<value>]]
<value> - scale factor of the integrated output voltage (0..1023 - 10 bit precision)
it must be present if <enable>=1
NOTE:
The DAC frequency is selected internally. D/A converter must not be used during
POWERSAVING.
Refer to SW User Guide or to AT Commands Reference Guide for the full description
of this function.
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13.1.3.
Low Pass Filter Example
13.2.
ADC Converter
13.2.1.
Description
The GE863-GPS module provides one Analog to Digital Converter. The input line
(named ADC_IN1) is available on BGA Ball #23 of the GE863-GPS module and on pin
19 of PL104 on EVK2 Board (CS1151).
The GE863-QUAD / PY / SIM modules provide 3 Analog to Digital Converters.
The input lines are available on:
ADC_IN1 on BGA Ball #23 of the module and on pin 19 of PL104 on EVK Interface
board.
ADC_IN2 on BGA Ball #74 of the module and on pin 20 of PL104 on EVK Interface
board.
ADC_IN3 on BGA Ball #70 of the module and on pin 21 of PL104 on EVK Interface
board.
The on board A/D is 11-bit converter. It is able to read a voltage level in the range of
0÷2 volts applied on the ADC pin input, store and convert it into 11 bit word.
Input Voltage range
AD conversion
Resolution
Min
0
-
Max
2
11
<1
Units
Volt
bits
mV
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13.2.2.
Using ADC Converter
An AT command is available to use the ADC function.
The command is AT#ADC=1,2 and the read value is expressed in mV
Refer to SW User Guide or to AT Commands Reference Guide for the full description
of this function.
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14.
Mounting the GE863 on the Application Board
14.1.
General
The Telit GE863 modules have been designed in order to be compliant with a
standard lead-free SMT process.
14.1.1.
Module Finishing & Dimensions
Surface finishing Ni/Au for all test pads
Lead-free Alloy:
Surface finishing Sn/Ag/Cu for all solder pads
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14.1.2.
Recommended Foot Print for the Application
NOTE:
Pads 81,
82, 83 and
84 are not
in line
with the
others.
Please
check the
quotes.
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14.1.3.
Suggested Inhibit Area
In order to easily rework the GE863 it is suggested to consider on the application of a
1.5mm Inhibit area around the
module.
1.5mm
1.5mm
Top View
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.
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14.1.4.
Debug of the GE863 in Production
To test and debug mounting of the GE863, we strongly recommend to foresee test
pads on the host PCB, in order to check the connection between the GE863 itself and
the application and to test the performance of the module connecting it with an
external computer. Depending by the customer application, these pads include, but
are not limited to, the following signals:
14.1.5.
•
TXD
•
RXD
•
ON/OFF
•
RESET
•
GND
•
VBATT
•
TX_TRACE
•
RX_TRACE
•
PWRMON
Stencil
Stencil’s apertures layout can be the same of the recommended footprint (1:1), we
suggest a thickness of stencil foil ≥ 120µm.
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14.1.6.
PCB Pad Design
“Non solder mask defined” (NSMD) type is recommended for the solder pads on the
PCB.
Recommendations for PCB Pad Dimensions
Ball pitch [mm]
Solder resist opening diameter A [mm]
Metal pad diameter B [mm]
2
1,150
1 ± 0.05
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Placement of microvias not covered by solder resist is not recommended, unless the
microvia carries the same signal of the pad itself.
Holes in pad are allowed only for blind holes and not for through holes.
Recommendations for PCB pad surfaces:
Finish
Electro-less Ni /
Immersion Au
Layer thickness [µm]
3 -7 /
0.05 - 0.15
Properties
Good solder ability protection, high
shear force values
The PCB must be able to resist higher temperatures occurring at the lead-free
process. This issue must be discussed with the PCB-supplier. Generally, the wetability of tin-lead solder paste on the described surface plating is better, compared to
lead-free solder paste.
14.1.7.
Solder Paste
Lead free
Solder paste
Sn/Ag/Cu
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14.1.8.
GE863 Solder Reflow
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
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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
8 minutes max.
Note: All temperatures refer to topside of the package, measured on the package
body surface.
WARNING:
The GE863 module can accept only one reflow process.
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15.
Packing System
According to SMT processes, for picking & placing movement requirements, Telit
GE863 modules are packaged on trays. Each tray contains 20 pieces with the
following dimensions:
Note that trays can withstand a maximum temperature of 65° C.
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Modules orientation on tray:
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15.1.1.
Moisture Sensibility
The level of moisture sensibility of Telit GE863 modules 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 GE863 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
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16.
Conformity Assessment Issues
The Telit GE863-GPS/PY/QUAD/SIM has been assessed in order to satisfy the
essential requirements of the R&TTE Directive 1999/05/EC (Radio Equipment &
Telecommunications Terminal Equipments) to demonstrate the conformity against
the harmonized standards with the final involvement of a Notified Body.
0168
If the module is installed in conformance to the Telit installation manuals, no further
evaluation under Article 3.2 of the R&TTE Directive and do not require further
involvement of a R&TTE Directive Notified Body for the final product.
In all other cases, or if the manufacturer of the final product is in doubt, then the
equipment integrating the radio module must be assessed against Article 3.2 of the
R&TTE Directive.
In all cases the assessment of the final product must be made against the Essential
requirements of the R&TTE Directive Articles 3.1(a) and (b), Safety and EMC
respectively, and any relevant Article 3.3 requirements.
This Product Description, the Hardware User Guide and Software User Guide contain
all the information you may need for developing a product meeting the R&TTE
Directive.
Furthermore the GE863-GPS/PY/QUAD/SIM module is FCC Approved as module to be
installed in other devices. This device is to be used only for fixed and mobile
applications. If the final product after integration is intended for portable use, a new
application and FCC is required.
The GE863-GPS/PY/QUAD/SIM is conforming to the following US Directives:
•
Use of RF Spectrum. Standards: FCC 47 Part 24 (GSM 1900)
•
EMC (Electromagnetic Compatibility). Standards: FCC47 Part 15
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GE863 Family Hardware User Guide
1vv0300783 Rev.4 – 2009-12-16
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.
To meet the FCC's RF exposure rules and regulations:
•
The system antenna(s) used for this transmitter must be installed to provide a
separation distance of at least 20 cm from all the persons and must not be colocated or operating in conjunction with any other antenna or transmitter.
•
The system antenna(s) used for this module must not exceed 1.4dBi (850MHz)
and 3.0dBi (1900MHz) for mobile and fixed or mobile operating configurations.
•
Users and installers must be provided with antenna installation instructions
and transmitter operating conditions for satisfying RF exposure compliance.
Manufacturers of mobile, fixed or portable devices incorporating this module are
advised to clarify any regulatory questions and to have their complete product tested
and approved for FCC compliance.
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved.
Page 88 of 90
GE863 Family Hardware User Guide
1vv0300783 Rev.4 – 2009-12-16
17.
Safety Recommendations
Read Carefully!
Be sure about that 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, aircraft, etc
•
Where there is a risk of explosion such as gasoline stations, oil refineries,
etc
It is the responsibility of the user to keep to country regulations and the specific
environment regulation.
Do not disassemble the product; any mark of tampering will compromise the
warranty validity.
We recommend to follow 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 for the functioning of the final product;
therefore, care has to be taken to the external components of the module, as well as
to any project or installation issue. The risk of disturbing the GSM network or
external devices or having impact on the security cannot be avoided. 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 be installed with the guarantee of a minimum 20
cm distance from the body. In case these requirements cannot be satisfied, the
system integrator has to assess the final product against the SAR regulation EN
50360.
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved.
Page 89 of 90
GE863 Family Hardware User Guide
1vv0300783 Rev.4 – 2009-12-16
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/
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved.
Page 90 of 90
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