Telit Communications S p A GE864QA2B Quadband GSM/ GPRS Module User Manual

Telit Communications S.p.A. Quadband GSM/ GPRS Module

User Manual

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GE864-QUAD Automotive V2
Hardware User Guide
1vv0300840 Rev.3 – 2010-04-08
GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
Applicable products
PRODUCT
GE864GE864-QUAD
Automotive V2
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page 2 of 71
GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
Contents
1. Introduction................................
Introduction ................................................................
................................ ................................................................
...............................................................................
............................................... 7
1.1.
Scope ................................................................
................................ ................................................................
................................ ...........................................................
................................ ........................... 7
1.2.
Contact Information, Support ................................................................
................................ .......................................................
................................ ....................... 7
1.3.
Text Conventions ................................................................
................................ ................................................................
................................ ..........................................
................................ .......... 8
1.4.
Related Documents ................................................................
................................ ................................................................
................................ ......................................
................................ ...... 8
1.5.
Document History ................................................................
................................ ................................................................
................................ ........................................
................................ ........ 8
2. Overview................................
Overview ................................................................
................................ ................................................................
....................................................................................
.................................................... 9
3. GE864GE864- QUAD Automotive V2 Mechanical Dimensions ..............................................
.............................................. 10
4. GE864GE864- QUAD Automotive V2 module
modul e connections ....................................................
.................................................... 11
4.1.
PINPIN-OUT ................................................................
................................ ................................................................
................................ .....................................................
................................ ..................... 11
4.1.1.
BGA Balls Layout ..................................................................................................................................15
5. Hardware Commands ................................................................
................................ ..............................................................
.............................................................. 17
5.1.
Turning ON the GE864GE864-QUAD Automotive V2 module ...................................................
................................ ................... 17
5.2.
Turning OFF the GE864GE864 -QUAD Automotive V2 ..............................................................
................................ .............................. 19
5.2.1.
Hardware Unconditional Restart .......................................................................................................20
6. Power Supply ................................................................
................................................................................................
................................ ..........................................
.......................................... 23
6.1.
Power
Power Supply Requirements ................................................................
................................ .......................................................
................................ ....................... 23
6.2.
Power Consumption................................
Consumption ................................................................
................................ ................................................................
................................ ....................................
................................ .... 24
6.3.
General Design Rules ................................................................
................................ ................................................................
................................ .................................
................................ . 25
6.3.1.
Electrical Design Guidelines................................................................................................................25
6.3.1.1. + 5V input Source Power Supply Design Guidelines.......................................................................25
6.3.1.2. + 12V input Source Power Supply Design Guidelines.....................................................................26
6.3.1.3. Battery Source Power Supply Design Guidelines...........................................................................27
6.3.2.
Thermal Design Guidelines..................................................................................................................29
6.3.3.
Power Supply PCB layout Guidelines ..................................................................................................30
7. Antenna ................................................................
................................................................................................
...................................................................................
................................................... 31
7.1.
GSM Antenna Requirements ................................................................
................................ .......................................................
................................ ....................... 31
7.2.
GSM Antenna - PCB line Guidelines ................................................................
................................ ............................................
................................ ............ 32
7.3.
GSM Antenna - Installation Guidelines
Guidelines ................................................................
................................ ........................................
................................ ........ 33
8. Logic level specifications ................................................................
........................................................................................
........................................................ 34
8.1.
Reset signal................................
signal ................................................................
................................ ................................................................
................................ ................................................
................................ ................ 35
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
9. Serial
Serial Ports ................................................................
................................ ................................................................
.............................................................................
............................................. 36
9.1.
MODEM SERIAL PORT ................................................................
................................ ................................................................
................................ .................................
................................ . 36
9.2.
RS232 level translation ................................................................
................................ ...............................................................
................................ ............................... 38
9.3.
UART level translation ................................................................
................................ ................................................................
................................ ................................ 41
10. Audio Section Overview ................................................................
...........................................................................................
................................ ........................... 43
10.1.
Selection mode................................
mode ................................................................
................................ ................................................................
................................ ........................................
................................ ........ 43
10.2.
Electrical Characteristics ................................................................
................................ ........................................................
................................ ........................ 45
10.2.1.
10.2.2.
Input Lines Characteristics..................................................................................................................45
Output Lines Characteristics ...............................................................................................................46
11. General Purpose I/O ................................................................
................................................................................................
................................ ................................ 48
11.1.
GPIO Logic levels................................
levels ................................................................
................................ ................................................................
................................ .....................................
................................ ..... 49
11.2.
Using a GPIO Pad as INPUT ................................................................
.....................................................................................
................................ ..................... 50
11.3.
Using a GPIO Pad as OUTPUT ................................................................
................................ ..................................................
................................ .................. 50
11.4.
Using the RF Transmission Control GPIO4 ...............................................................
................................ ............................... 50
11.5.
Using the RFTXMON Output GPIO5 ................................................................
...........................................................................
................................ ........... 51
11.6.
Using the Alarm Output GPIO6 ................................................................
................................ .................................................
................................ ................. 51
11.7.
Using the Buzzer Output GPIO7................................
GPIO7 ................................................................
................................ ................................................
................................ ................ 51
11.8.
Indication of network service availability................................
availability ................................................................
................................ ..................................
................................ .. 52
11.9.
RTC Bypass out ................................................................
................................ ................................................................
................................ .......................................
................................ ....... 54
11.10.
External SIM Holder Implementation ................................................................
................................ .......................................
................................ ....... 54
12. DAC and ADC section................................
section ................................................................
...............................................................................................
............................................................... 55
12.1.
12.1.1.
12.1.2.
12.1.3.
12.2.
12.2.1.
12.2.2.
DAC Converter................................
Converter ................................................................
................................ ................................................................
................................ .........................................
................................ ......... 55
Description............................................................................................................................................55
Enabling DAC ........................................................................................................................................56
Low Pass Filter Example .....................................................................................................................56
ADC Converter................................
Converter ................................................................
................................ ................................................................
................................ .........................................
................................ ......... 57
Description............................................................................................................................................57
Using ADC Converter............................................................................................................................57
13. Mounting the GE864GE864- QUAD Automotive V2 on your Board ........................................
........................................ 58
13.1.
General
General ................................................................
................................ ................................................................
................................ ...................................................
................................ ................... 58
13.2.
Module finishing & dimensions ................................................................
................................ ................................................
................................ ................ 58
13.3.
Recommended foot print for the application ............................................................
................................ ............................ 59
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
13.4.
Debug of the GE864 in production ................................................................
................................ ............................................
................................ ............ 60
13.5.
Stencil ................................................................
................................................................................................
................................ .....................................................
................................ ..................... 60
13.6.
PCB pad design ................................................................
................................ ................................................................
................................ .......................................
................................ ....... 61
13.7.
Solder paste ................................................................
................................ ................................................................
................................ ............................................
................................ ............ 62
13.7.1.
GE864 Solder reflow.............................................................................................................................63
14. Packing system ................................................................
................................................................................................
.......................................................................
................................ ....... 65
14.1.
GE864 orientation on the tray................................
tray ................................................................
................................ ...................................................
................................ ................... 67
14.2.
Moisture sensibility ................................................................
................................ ................................................................
................................ .................................
................................ . 67
15. Conformity Assessment Issues................................
Issues ................................................................
................................................................................
................................................ 68
16. SAFETY RECOMMANDATIONS ................................................................
.................................................................................
................................ ................. 70
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
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 S.p.A. 2010.
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page 6 of 71
GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
1.
Introduction
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.
1.1.
Scope
The aim of this document is the description of some hardware solutions useful for
developing a product with the Telit GE864GE864-QUAD Automotive V2module.
V2
1.2.
Contact Information, Support
For general contact, technical support, to report documentation errors and to order
manuals, contact Telit Technical Support Center (TTSC) at:
TS-EMEA@telit.com
TS-NORTHAMERICA@telit.com
TS-LATINAMERICA@telit.com
TS-APAC@telit.com
Alternatively, use:
http://www.telit.com/en/products/technical-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
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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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
1.3.
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
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.
1.4.
1.5.
Related Documents
•
SIM Holder Design Guides, 80000NT10001a
•
SW User Guide, 1vv0300784
•
GE864-QUAD Automotive V2 Product Description, 80331ST10066a
•
Audio settings application note , 80000NT10007a
•
AT Commands Reference Guide 80000ST10025a
Document History
R e v i si on
Da te
Changes
ISSUE#0
ISSUE#1
2009-07-01
2009-07-27
ISSUE#2
2010-03-30
ISSUE#3
2010-04-08
First Release from rev 7 of 1vv0300779
Changed par. 4.1 Turning ON and par. 5.1 Power supply Requirements
Changed par. 12.3 Recommended foot print…. and par.14 Conformity Assessment
Issues
Applied new layout (paragraphs numbers shifted accordingly)
Updated par. 9.3 5V UART level translation
Updated chapter 10
The external function error on pin F3
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
2.
Overview
The aim of this document is the description of some hardware solutions useful for
developing a product with the Telit GE864GE864-QUAD Automotive V2 module.
In this document all the basic functions of a mobile phone module will be taken into
account; for each one of them a proper hardware solution will be suggested and
eventually the wrong solutions and common errors to be avoided will be evidenced.
Obviously this document cannot embrace the whole hardware solutions and products
that may be designed. The wrong solutions to be avoided shall be considered as
mandatory, while the suggested hardware configurations shall not be considered
mandatory, instead the information given shall be used as a guide and a starting point
for properly developing your product with the Telit GE864GE864-QUAD Automotive V2
module. For further hardware details that may not be explained in this document refer
to the Telit GE864-QUAD Automotive V2 Product Description document where all the
hardware information is reported.
NOTE:
The integration of the GSM/GPRS GE864-QUAD Automotive V2 cellular module within user
application shall be done according to the design rules described in this manual.
The information presented in this document is believed to be accurate and reliable.
However, no responsibility is assumed by Telit Communications S.p.A. for its use, nor
any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent rights of Telit
Communications S.p.A. other than for circuitry embodied in Telit products. This
document is subject to change without notice.
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page 9 of 71
GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
3.
GE864-QUAD Automotive V2 Mechanical Dimensions
The Telit GE864GE864 -QUAD Automotive V2 module overall dimension are:
•
•
•
•
Length:
Width:
Thickness:
Weight:
30 mm
30 mm
2.9 mm
5,2 g/4,2g
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
4.
GE864-QUAD Automotive V2 module connections
4.1.
PINPIN- OUT
Ball
Signal
Signal
I/O
Function
Internal PULL UP
Type
Audio
F9
AXE
G8
MIC_HF+
AI
G9
MIC_MT-
AI
G10
EAR_MT+
AO
J8
MIC_MT+
AI
J9
MIC_HF-
AI
J10
EAR_HF-
AO
Handsfree switching
Handsfree mic. input; phase +, nom. level
3mVrms
Handset mic.signal input; phase-, nom. level
50mVrms
Handset earphone signal output, phase +
Handset mic.signal input; phase+, nom. level
50mVrms
Handsfree mic.input; phase -, nom. level
3mVrms
Handsfree ear output, phase -
100K
CMOS 2.8V
H9
EAR_MT-
AO
Handset earphone signal output, phase -
Audio
H10
EAR_HF+
AO
Handsfree ear output, phase +
Audio
Audio
Audio
Audio
Audio
Audio
Audio
SIM card interface
C10
SIMCLK
External SIM signal – Clock
C11
SIMIN
External SIM signal - Presence (active low)
1,8 / 3V
D4
SIMVCC
External SIM signal – Power supply for the SIM
1,8 / 3V
D10
SIMIO
I/O
External SIM signal - Data I/O
1,8 / 3V
E9
SIMRST
External SIM signal – Reset
1,8 / 3V
47K
1,8 / 3V
Trace
D11
TX_TRACE
TX Data for debug monitor
CMOS 2.8V
F10
RX_TRACE
RX Data for debug monitor
CMOS 2.8V
Prog. / Data + HW Flow Control
B6
C125/RING
Output for Ring indicator signal (RI) to DTE
Input for Data terminal ready signal (DTR) from
DTE
Output for Data carrier detect signal (DCD) to
DTE
Serial data input (TXD) from DTE
CMOS 2.8V
B7
C108/DTR
D9
C109/DCD
E7
C103/TXD
E11
C107/DSR
CMOS 2.8V
Output for Data set ready signal (DSR) to DTE
Input for Request to send signal (RTS) from
DTE
Output for Clear to send signal (CTS) to DTE
F7
C105/RTS
F6
C106/CTS
H8
C104/RXD
Serial data output to DTE
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
DAC and ADC
C7
DAC_OUT
AO
Digital/Analog converter output
D/A
J11
ADC_IN1
AI
Analog/Digital converter input
A/D
H11
ADC_IN2
AI
Analog/Digital converter input
A/D
A2
RESET*
Reset input
Miscellaneous Functions
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
Ball
Signal
Si gnal
I/O
Function
Internal PULL UP
Type
D8
STAT_LED
Status indicator led
CMOS 1.8V
E2
VRTC
AO
Power
J5
ON_OFF*
L8
PWRMON
VRTC
Input command for switching power ON or OFF
(toggle command). The pulse to be sent to the
47K
GE864-QUAD Automotive V2 must be equal or
greater than 1 second.
Power ON Monitor
L4
Antenna
Antenna output – 50 ohm
RF
E6
GPIO_01 / JDR
I/O
Telit GPIO01 I/O pin / Jammer detect report
CMOS 2.8V
H5
GPIO_02/PCM_WAO
I/O
Telit GPIO02 Configurable GPIO / PCM audio *
CMOS 2.8V
K7
GPIO_03 / PCM_RX
I/O
CMOS 2.8V
B3
GPIO_04
I/O
K8
GPIO_05 / RFTXMON
I/O
B5
GPIO_06 / ALARM
I/O
Telit GPIO03 Configurable GPIO / PCM audio *
Telit GPIO04 Configurable GPIO / RF
Transmission Control
Telit GPIO05 Configurable GPIO / Transmitter
ON monitor
Telit GPIO06 Configurable GPIO / ALARM
L9
GPIO_07 / BUZZER
I/O
Telit GPIO07 Configurable GPIO / Buzzer
CMOS 2.8V
H3
GPIO_08 / PCM_TX
I/O
Telit GPIO08 Configurable GPIO / PCM audio *
CMOS 2.8V
D7
GPIO_09 / PCM_CLK
I/O
Telit GPIO09 Configurable GPIO / PCM audio *
CMOS 2.8V
Pull up to VBATT
CMOS 2.8V
Telit GPIO
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
Power Supply
J1
VBATT
Main power supply
Power
K1
VBATT
Main power supply
Power
J2
VBATT
Main power supply
Power
K2
VBATT
Main power supply
Power
A1
GND
Ground
Power
A11
GND
Ground
Power
D6
GND
Ground
Power
F1
GND
Ground
Power
F11
GND
Ground
Power
H1
GND
Ground
Power
H2
GND
Ground
Power
J3
GND
Ground
Power
K3
GND
Ground
Power
K4
GND
Ground
Power
K5
GND
Ground
Power
K6
GND
Ground
Power
L1
GND
Ground
Power
L2
GND
Ground
Power
L3
GND
Ground
Power
L6
GND
Ground
Power
L11
GND
Ground
Power
RESERVED
A3
Reserved
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
Ball
Signal
Si gnal
I/O
Function
A4
Reserved
A5
Reserved
A6
Reserved
A7
Reserved
A8
Reserved
A9
Reserved
A10
Reserved
B1
Reserved
B2
Reserved
B4
Reserved
B8
Reserved
B9
Reserved
B10
Reserved
B11
Reserved
C1
Reserved
C2
Reserved
C3
Reserved
C4
Reserved
C5
Reserved
C6
Reserved
C8
Reserved
C9
Reserved
D1
Reserved
D2
Reserved
D3
Reserved
D5
Reserved
E1
Reserved
E3
Reserved
E4
Reserved
E5
Reserved
E8
Reserved
E10
Reserved
F2
Reserved
F3
Reserved
F4
Reserved
F5
Reserved
F8
Reserved
G1
Reserved
G2
Reserved
G3
Reserved
G4
Reserved
G5
Reserved
G6
Reserved
Internal PULL UP
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Type
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
Ball
Signal
Si gnal
I/O
Function
G7
Reserved
G11
Reserved
H4
Reserved
H6
Reserved
H7
Reserved
J4
Reserved
J6
Reserved
J7
Reserved
K9
Reserved
K10
Reserved
K11
Reserved
L5
Reserved
L7
Reserved
L10
Reserved
Internal PULL UP
Type
* Ref. to Digital Voice Interface Application Note 80000NT10004a.
NOTE:
RESERVED pins must not be connected
NOTE:
RTS must be connected to the GND (on the module side) if flow control is not used.
NOTE:
If not used, almost all pins should be left disconnected. The only exceptions are the
following pins:
pin
J1,K1,J2,K2
A1,F1,H1,L1,H2,L2,J3,K3,L3,
K4,K5,D6,K6,L6,A11,F11,L11
K4,K5,D6,K6,L6,A11,F11,L11
J5
E7
A2
H8
signal
VBATT
GND
ON/OFF*
TXD
RESET*
RXD
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
4.1.1.
BGA Balls Layout
TOP VIEW
GND
GND
GND
VBATT
VBATT
GND
RESET*
VRTC
GND
VBATT
VBATT
GND
GPIO_04
GPIO_08 /
PCM_TX
GND
GND
GND
--
SIMVCC
GND
Antenna
GPIO_06 /
ALARM
GPIO_02 /
PCM_WAO
ON_OFF*
GND
C125/RING
GND
GPIO_01 /
JDR
C106 / CTS
GND
GND
C108 / DTR
DAC_OUT
GPIO_09 /
PCM_CLK
C103 / TXD
C105 / RTS
GPIO_03/
PCM_RX
STAD_ LED
MIC_HF+
C104 / RXD
MIC_MT+
GPIO_05 /
RFTXMON
PWRMON
C109 / DCD
SIMRST
AXE
MIC_MT-
EAR_MT-
MIC_HF-
GPIO_07 /
BUZZER
10
SIMCLK
SIMIO
RX_TRACE
EAR_MT+
EAR_HF+
EAR_HF-
11
GND
SIMIN
TX_TRACE
C107 / DSR
GND
ADC_IN2
ADC_IN1
GND
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
AUDIO Signals balls
SIM CARD interface balls
TRACE Signals balls
Prog. / data + Hw Flow Control signals balls
ADC signals balls
MISCELLANEOUS functions signals balls
TELIT GPIO balls
POWER SUPPLY VBATT balls
POWER SUPPLY GND balls
RESERVED
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page 16 of 71
GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
5.
Hardware Commands
5.1.
Turning ON the GE864GE864 - QUAD Automotive V2 module
To turn on the GE864-QUAD Automotive V2 the pad ON* must be tied low for at least 1
seconds and then released.
When the power supply voltage is lower than 3.4V the pad ON# must be tied low for at
least 3 seconds.
The maximum current that can be drained from the ON* pad is 0,1 mA.
A simple circuit to do it is:
NOTE:
don't use any pull up resistor on the ON* line, it is internally pulled up. Using pull up
resistor may bring to latch up problems on the GE864-QUAD Automotive V2 power
regulator and improper power on/off of the module. The line ON* must be connected
only in open collector configuration.
NOTE:
In this document all the lines that are inverted, hence have active low signals are
labeled with a name that ends with a "*" .
TIP:
To check if the device has powered on, the hardware line PWRMON should be
monitored. After 00ms the line raised up the device could be considered powered on.
NOTE:
It is recommended to avoid having any HIGH logic level signal applied to the digital pins
of the GE864-QUAD Automotive V2when the module is powered off.
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A flow chart showing the proper turn on procedure is displayed below:
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For example:
1- Let's assume you need to drive the ON* pad with a totem pole output from +1.8V up
to 5V microcontroller (uP_OUT1):
2- Let's assume you need to drive the ON* pad directly with an ON/OFF button:
5.2.
Turning OFF the GE864GE864 - QUAD Automotive V2
The turning off of the device can be done in two ways:
•
via AT command (see GE864-QUAD / PY Software User Guide)
•
by tying low pin ON#
Either ways, when the device issues a detach request to the network informing that the device
will not be reachable any more.
To turn OFF the GE864-QUAD / PY the pad ON# must be tied low for at least 2 seconds and then
released.
The same circuitry and timing for the power on shall be used.
The device shuts down after the release of the ON# pad.
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TIP:
To check if the device has powered off, the hardware line PWRMON must be monitored.
When PWRMON goes low, the device has powered off.
5.2.1.
Hardware Unconditional Restart
WARNING:
The hardware unconditional Restart must not be used during normal operation of the
device since it does not detach the device from the network. It shall be kept as an
emergency exit procedure to be done in the rare case that the device gets stacked
waiting for some network or SIM responses.
To unconditionally restart the GE864-QUAD / PY, the pad RESET# must be tied low for at least
200 milliseconds and then released.
The maximum current that can be drained from the ON# pad is 0.15 mA.
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A simple circuit to do it is:
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 GE864-QUAD / PY 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
must be used by the software as an emergency exit procedure.
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The following flow chart shows the proper Reset 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):
This signal is internally pulled up so the pin can be left floating if not used.
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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
Nominal Supply Voltage
3.8V
Max Supply Voltage
4.2V
Operating Supply Voltage Range
3.4V – 4.2V
Wide Supply Voltage tolerant
3.25V – 4.2V
TIP:
the supply voltage is directly measured between VBATT and GND balls. It must
stay within the Wide Supply Voltage tolerant range including any drop voltage
and overshoot voltage (during the slot tx, for example).
NOTE:
NOTE:
The Operating Voltage Range MUST never be exceeded also in power off
condition; care must be taken in order to fulfill min/max voltage requirement
NOTE:
When the power supply voltage is lower than 3.4V, to turn ON the module, the
pad ON# must be tied low for at least 3 seconds. See para 5.1
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6.2.
Power Consumption
The GE864-QUAD Automotive V2 power consumptions are:
Average
(mA)
SWITCHED OFF
Switched Off
<62uA
Mode
AT+CFUN=1
19,0
AT+CFUN=4
18,0
3,9
2,9
AT+CFUN=0 or =5
2,1
1,9
1,6
CSD TX and RX mode
GSM900 CSD PL5
305,0
DCS1800 CSD PL0
208,0
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
IDLE mode
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
GSM VOICE CALL
GPRS Sending data mode
GPRS Sending data mode
The GSM system is made in a way that the RF transmission is not continuous, else it is
packed into bursts at a base frequency of about 216 Hz, the relative current peaks can
be as high as about 2A. Therefore the power supply has to be designed in order to
withstand with these current peaks without big voltage drops; this means that both the
electrical design and the board layout must be designed for this current flow.
If the layout of the PCB is not well designed a strong noise floor is generated on the
ground and the supply; this will reflect on all the audio paths producing an audible
annoying noise at 216 Hz; if the voltage drop during the peak current absorption is too
much, then the device may even shutdown as a consequence of the supply voltage drop.
TIP:
The electrical design for the Power supply should be made ensuring it will be capable
of a peak current output of at least 2A.
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6.3.
General Design Rules
The principal guidelines for the Power Supply Design embrace three different design
steps:
• the electrical design
• the thermal design
• the PCB layout.
6.3.1.
Electrical Design Guidelines
The electrical design of the power supply depends strongly from the power source
where this power is drained. We will distinguish them into three categories:
• +5V input (typically PC internal regulator output)
• +12V input (typically automotive)
• Battery
6.3.1.1.
+ 5V input Source Power Supply Design Guidelines
•
•
•
•
•
The desired output for the power supply is 3.8V, hence there's not a big
difference between the input source and the desired output and a linear
regulator can be used. A switching power supply will not be suited because of
the low drop out requirements.
When using a linear regulator, a proper heat sink shall be provided in order to
dissipate the power generated.
A Bypass low ESR capacitor of adequate capacity must be provided in order to
cut the current absorption peaks close to the GE864-QUAD Automotive V2, a
100µF tantalum capacitor is usually suited.
Make sure the low ESR capacitor on the power supply output (usually a
tantalum one) is rated at least 10V.
A protection diode should be inserted close to the power input, in order to save
the GE864-QUAD Automotive V2 from power polarity inversion.
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An example of linear regulator with 5V input is:
6.3.1.2.
+ 12V input Source Power Supply Design Guidelines
•
•
•
•
•
•
•
The desired output for the power supply is 3.8V, hence due to the big difference
between the input source and the desired output, a linear regulator is not suited
and shall not be used. A switching power supply will be preferable because of its
better efficiency especially with the 2A peak current load represented by the
GE864-QUAD Automotive V2.
When using a switching regulator, a 500kHz or more switching frequency
regulator is preferable because of its smaller inductor size and its faster
transient response. This allows the regulator to respond quickly to the current
peaks absorption.
In any case the frequency and Switching design selection is related to the
application to be developed due to the fact the switching frequency could also
generate EMC interferences.
For car PB battery the input voltage can rise up to 15,8V and this should be kept
in mind when choosing components: all components in the power supply must
withstand this voltage.
A Bypass low ESR capacitor of adequate capacity must be provided in order to
cut the current absorption peaks, a 100µF tantalum capacitor is usually suited.
Make sure the low ESR capacitor on the power supply output (usually a tantalum
one) is rated at least 10V.
For Car applications a spike protection diode should be inserted close to the
power input, in order to clean the supply from spikes.
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•
A protection diode should be inserted close to the power input, in order to save
the GE864-QUAD Automotive V2 from power polarity inversion. This can be the
same diode as for spike protection.
An example of switching regulator with 12V input is in the below schematic (it is split in
2 parts):
6.3.1.3.
Battery Source Power Supply Design Guidelines
• The desired nominal output for the power supply is 3.8V and the maximum
voltage allowed is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for
supplying the power to the Telit GE864-QUAD Automotive V2 module.
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 GE864-QUAD Automotive V2 and damage it.
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WARNING:
WARNING:
DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with
GE864-QUAD Automotive V2. Their use can lead to overvoltage on the GE864QUAD Automotive V2 and damage it. USE ONLY Li-Ion battery types.
•
•
•
•
A Bypass low ESR capacitor of adequate capacity must be provided in order to
cut the current absorption peaks, a 100µF tantalum capacitor is usually suited.
Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.
A protection diode should be inserted close to the power input, in order to save
the GE864-QUAD Automotive V2 from power polarity inversion. Otherwise the
battery connector should be done in a way to avoid polarity inversions when
connecting the battery.
The battery capacity must be at least 500mAh in order to withstand the current
peaks of 2A; the suggested capacity is from 500mAh to 1000mAh.
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6.3.2.
Thermal Design Guidelines
The thermal design for the power supply heat sink should be done with the following
specifications:
• Average current consumption during transmission @PWR level max:
•
•
•
500mA
Average current consumption during transmission @ PWR level min:
100mA
Average current during Power Saving (CFUN=5):
4mA
Average current during idle (Power Saving disabled)
24mA
NOTE:
The average consumption during transmissions depends on the power level at which
the device is requested to transmit by the network. The average current consumption
hence varies significantly.
Considering the very low current during idle, especially if Power Saving function is
enabled, it is possible to consider from the thermal point of view that the device
absorbs current significantly only during calls.
If we assume that the device stays into transmission for short periods of time (let's say
few minutes) and then remains for a quite long time in idle (let's say one hour), then the
power supply has always the time to cool down between the calls and the heat sink
could be smaller than the calculated one for 500mA maximum RMS current, or even
could be the simple chip package (no heat sink).
Moreover in the average network conditions the device is requested to transmit at a
lower power level than the maximum and hence the current consumption will be less
than the 500mA, being usually around 150mA.
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.
For the heat generated by the GE864-QUAD Automotive V2, you can consider it to be
during transmission 1W max during CSD/VOICE calls and 2W max during class10 GPRS
upload.
This generated heat will be mostly conducted to the ground plane under the GE864QUAD Automotive V2; you must ensure that your application can dissipate it.
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6.3.3.
Power Supply PCB layout Guidelines
As seen on the electrical design guidelines the power supply shall have a low ESR
capacitor on the output to cut the current peaks and a protection diode on the input to
protect the supply from spikes and polarity inversion. The placement of these
components is crucial for the correct working of the circuitry. A misplaced component
can be useless or can even decrease the power supply performances.
•
•
•
•
•
•
•
•
The Bypass low ESR capacitor must be placed close to the Telit GE864-QUAD
Automotive V2 power input pads or in the case the power supply is a switching
type it can be placed close to the inductor to cut the ripple provided the PCB
trace from the capacitor to the GE864-QUAD Automotive V2 is wide enough to
ensure a dropless connection even during the 2A current peaks.
The protection diode must be placed close to the input connector where the
power source is drained.
The PCB traces from the input connector to the power regulator IC must be
wide enough to ensure no voltage drops occur when the 2A current peaks are
absorbed. Note that this is not made in order to save power loss but especially
to avoid the voltage drops on the power line at the current peaks frequency of
216 Hz that will reflect on all the components connected to that supply,
introducing the noise floor at the burst base frequency. For this reason while a
voltage drop of 300-400 mV may be acceptable from the power loss point of view,
the same voltage drop may not be acceptable from the noise point of view. If
your application doesn't have audio interface but only uses the data feature of
the Telit GE864-QUAD Automotive V2, then this noise is not so disturbing and
power supply layout design can be more forgiving.
The PCB traces to the GE864-QUAD Automotive V2 and the Bypass capacitor
must be wide enough to ensure no significant voltage drops occur when the 2A
current peaks are absorbed. This is for the same reason as previous point. Try
to keep this trace as short as possible.
The PCB traces connecting the Switching output to the inductor and the
switching diode must be kept as short as possible by placing the inductor and
the diode very close to the power switching IC (only for switching power supply).
This is done in order to reduce the radiated field (noise) at the switching
frequency (100-500 kHz usually).
The use of a good common ground plane is suggested.
The placement of the power supply on the board should be done in such a way
to guarantee that the high current return paths in the ground plane are not
overlapped to any noise sensitive circuitry as the microphone amplifier/buffer or
earphone amplifier.
The power supply input cables should be kept separate from noise sensitive
lines such as microphone/earphone cables.
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7.
Antenna
The antenna connection and board layout design are the most important part in the full
product design and they strongly reflect on the product overall performances, hence
read carefully and follow the requirements and the guidelines for a proper design.
7.1.
GSM Antenna Requirements
As suggested on the Product Description the antenna and antenna line on PCB for a
Telit GE864-QUAD Automotive V2 device shall fulfill the following requirements:
ANTENNA REQUIREMENTS
Frequency range
Depending by frequency band(s)
provided by the network operator, the
customer shall use the most suitable
antenna for that/those band(s)
Bandwidth
70 MHz in GSM850, 80 MHz in
GSM900, 170 MHz in DCS & 140 MHz
PCS band
Gain
Gain < 1,4dBi in GSM 850 & 900
and < 3,0dBi DCS & PCS
Impedance
50 ohm
Input power
> 2 W peak power
VSWR absolute max
<= 10:1
VSWR recommended
<= 2:1
When using the Telit GE864-QUAD Automotive V2, since there's no antenna connector
on the module, the antenna must be connected to the GE864-QUAD Automotive V2
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 GE864-QUAD Automotive V2, then a PCB line is
needed in order to connect with it or with its connector.
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This line of transmission shall fulfill the following requirements:
ANTENNA LINE ON PCB REQUIREMENTS
Impedance
50 ohm
Max Attenuation
0,3 dB
No coupling with other signals allowed
Cold End (Ground Plane) of antenna shall be equipotential to
the GE864GE864-QUAD Automotive V2 ground pins
Furthermore if the device is developed for the US market and/or Canada market, it
shall 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 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 GE864-QUAD
Automotive V2 module. Antennas used for this OEM module must not exceed 3dBi gain
for mobile and fixed operating configurations.
7.2.
GSM Antenna - PCB line Guidelines
•
•
•
•
•
•
•
•
•
Ensure that the antenna line impedance is 50 ohm;
Keep the antenna line on the PCB as short as possible, since the antenna line
loss shall be less than 0,3 dB;
Antenna line must have uniform characteristics, constant cross section, avoid
meanders and abrupt curves;
Keep, if possible, one layer of the PCB used only for the Ground plane;
Surround (on the sides, over and under) the antenna line on PCB with Ground,
avoid having other signal tracks facing directly the antenna line track;
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 GE864-QUAD Automotive V2
antenna line;
Keep the antenna line far away from the GE864-QUAD Automotive V2 power
supply lines;
If you have EM noisy devices around the PCB hosting the GE864-QUAD
Automotive V2, 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.
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•
7.3.
If you don't have EM noisy devices around the PCB of GE864-QUAD Automotive
V2, 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 shall not be installed inside metal cases
Antenna shall be installed also according Antenna manufacturer instructions.
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8.
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 GE864GE864-QUAD
Automotive V2 interface circuits:
Absolute Maximum Ratings
Parameter
Min
Input level on any -0.3V
digital pin when on
Input voltage on -0.3V
analog pins when on
Max
+3.1V
+3.0 V
Operating Range - Interface levels
levels (2.8V CMOS)
Level
Min
Max
Input high level
2.1V
3.1V
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
( 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
1uA
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8.1.
Reset signal
Signal
RESET
Function
Phone reset
I/O
Bga Ball
A2
RESET is used to reset the GE864GE864-QUAD Automotive V2 modules.
modules Whenever this
signal is pulled low, the GE864-QUAD Automotive V2 is reset. When the device is reset
it stops any operation. After the release of the reset GE864-QUAD Automotive V2 is
unconditionally shut down, without doing any detach operation from the network where
it is registered. This behaviour is not a proper shut down because any GSM device is
requested to issue a detach request on turn off. For this reason the Reset signal must
not be used to normally shutting down the device, but only as an emergency exit in the
rare case the device remains stuck waiting for some network response.
The RESET is internally controlled on start-up to achieve always a proper power-on
reset sequence, so there's no need to control this pin on start-up. It may only be used
to reset a device already on that is not responding to any command.
NOTE:
NOTE
do not use this signal to power off the GE864GE864 -QUAD Automotive V2.
V2 Use the ON/OFF
signal to perform this function or the AT#SHDN command.
Reset Signal Operating levels:
levels
Signal
Min
Max
RESET Input high
2.0V*
2.2V
RESET Input low
0V
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,
transistor to permit to the internal circuitry the
power on reset and under voltage lockout functions.
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9.
Serial Ports
The serial port on the Telit GE864-QUAD Automotive V2 is the core of the interface
between the module and OEM hardware.
2 serial ports are available on the module:
• MODEM SERIAL PORT
• MODEM SERIAL PORT 2 (DEBUG)
9.1.
MODEM SERIAL PORT
Several configurations can be designed for the serial port on the OEM hardware, but
the most common are:
• RS232 PC com port
• microcontroller UART @ 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 doesn't need a
level translation is the 2.8V UART.
The serial port on the GE864-QUAD Automotive V2 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 GE864-QUAD Automotive V2 UART are the CMOS levels:
Absolute Maximum Ratings -Not Functional
Parameter
Min
Max
Input level on any
digital pad when on
Input voltage on
analog pads when on
-0.3V
+3.1V
-0.3V
+3.0 V
Operating Range - Interface levels (2.8V CMOS)
Level
Min
Max
Input high level VIH
2.1V
3.1V
0V
0.5V
Output high level VOH
2.2V
3.0V
Output low level VOL
0V
0.35V
Input low level
VIL
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The signals of the GE864-QUAD Automotive V2 serial port are:
RS232
Pin
Number
Signal
Name
Usage
DCD - dcd_uart
GE864GE864QUAD
Automotive
V2 Pad
Number
D9
Data Carrier Detect
RXD - tx_uart
H8
Transmit line *see Note
TXD - rx_uart
E7
Receive line *see Note
DTR - dtr_uart
B7
Data Terminal Ready
GND
Ground
DSR - dsr_uart
A1,F1,H1
L1, H2, L2,
J3, K3….
E11
Output from the GE864-QUAD Automotive V2 that
indicates the carrier presence
Output transmit line of GE864-QUAD Automotive V2
UART
Input receive of the GE864-QUAD Automotive V2
UART
Input to the GE864-QUAD Automotive V2 that
controls the DTE READY condition
ground
Data Set Ready
RTS -rts_uart
F7
Request to Send
CTS - cts_uart
F6
Clear to Send
RI - ri_uart
B6
Ring Indicator
Output from the GE864-QUAD Automotive V2 that
indicates the module is ready
Input to the GE864-QUAD Automotive V2 that
controls the Hardware flow control
Output from the GE864-QUAD Automotive V2 that
controls the Hardware flow control
Output from the GE864-QUAD Automotive V2 that
indicates the incoming call condition
NOTE:
According to V.24, RX/TX signal names are referred to the application side, therefore on
the GE864 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 GE864-QUAD
Automotive V2 serial port and viceversa 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.
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9.2.
RS232 level translation
In order to interface the Telit GE864-QUAD Automotive V2 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 driver and
receiver and in the levels (be sure to get a true RS232 level translator not a RS485 or
other standards).
By convention the driver is the level translator from the 0-3V 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:
NOTE:
The digital input lines working at 2.8V CMOS have an absolute maximum input voltage
of 3.0V; therefore the level translator IC shall not be powered by the +3.8V supply of the
module. Instead, it must be powered from a +2.7V / +2.9V (dedicated) power supply.
This is because in this way the level translator IC outputs on the module side (i.e.
GE865 inputs) will work at +3.8V interface levels, damaging the module inputs.
NOTE:
In order to be able to do in circuit reprogramming of the GE864 firmware, the serial
port on the Telit GE864 shall be available for translation into RS232 and either it's
controlling device shall 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 applicator shall include in their design such a way of reprogramming the GE864.
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An example of level translation circuitry of this kind is:
The example is done with a SIPEX SP3282EB RS232 Transceiver that could accept
supply voltages lower than 3V DC.
NOTE:
In this case Vin has to be set with a value compatible with the logic levels of the module.
(Max 2.9V DC). In this configuration the SP3282EB will adhere to EIA/TIA-562 voltage
levels instead of RS232 (-5 ~ +5V)
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Second solution could be done using a MAXIM transceiver (MAX218) In this case the
compliance with RS232 (+-5V) is possible.
Another level adapting method could be done using a standard RS232 Transceiver
(MAX3237EAI) adding some resistors to adapt the levels on the GE865 Input lines.
NOTE: In this case has to be taken in account the length of the lines on the application
to avoid problems in case of High-speed rates on RS232.
The RS232 serial port lines are usually connected to a DB9 connector with the following
layout:
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9.3.
UART level
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:
The logic IC TC7SZ07AE may be used as level translator. Note that the TC7SZ07AE has
open drain output, therefore the resistor R2 is mandatory.
NOTE:
The UART input line TXD (rx_uart) of the GE864-QUAD Automotive V2 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) and RTS (rts_uart) input lines are not pulled up
internally, so an external pull-up resistor of 47KΩ may be required.
A power source of the internal interface voltage corresponding to the 2.8VCMOS high
level is available at the PWRMON pin on the connector, whose absolute maximum
output current is 1mA.
A maximum of 9 resistors of 47 KΩ pull-up can be connected to the PWRMON pin,
provided no other devices are connected to it and the pulled-up lines are GE864-QUAD
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Automotive V2 input lines connected to open collector outputs in order to avoid latch-up
problems on the GE864-QUAD Automotive V2.
Care must be taken to avoid latch-up on the GE864-QUAD Automotive V2 and the use of
this output line to power electronic devices shall be avoided, especially for devices that
generate spikes and noise such as switching level translators, micro controllers,
failure in any of these condition can severely compromise the GE864-QUAD Automotive
V2 functionality.
NOTE:
The input lines working at 2.8VCMOS can be pulled-up with 47KΩ resistors that can be
connected directly to the PWRMON line provided they are connected as in this example.
NO OTHER devices than those suggested should be powered with the PWRMON line;
otherwise the module functionality may be compromised.
It is important to consider that the added circuit must have consumption lower than
1mA.
In case of reprogramming of the module has to be considered the use of the RESET line
to start correctly the activity.
The preferable configuration is having an external supply for the buffer.
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10.
Audio Section Overview
The first 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:
•
(from H andS
Set or MicroT
Telephone )
internal audio transducers  HS/MT
HS
•
external audio transducers  HF
(from H andsF
Free )
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 drive the speaker, he needs to adopt the
Aduio2 Section ( HF ) . 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 GE864-QUAD V2 / GE864-DUAL V2 Telit Modules maintains the same
architecture.
For more information and suggestions refer to Telit document:
•
10.1.
Audio settings application note , 80000NT10007a
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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Balanced
Ear MT+
EP P1
HS
Earpiece
Single ended
16
Fully Differential
Audio Amplifier
Ear MTEP N1
Bias
Mic MT+
100nF
Balanced
AUDIO 1
SECTION
MICP1
HS
Microphone
Mic MTMICN1
Single ended
100nF
Balanced
Baseband
Audio Front End
Ear HF+
HF
Speaker
Single ended
LOUD1
Fully Differential
Audio Amplifier
Ear HFLOUD2
AUDIO 2
SECTION
Bias
Mic HF+
MICP2
100nF
Balanced
Single ended
HF
Microphone
Mic HF-
MICN2
100nF
xgaffull.skd
GE864GE864 -QUAD V2 / GE864GE864 - DUAL V2 Audio Front End Block Diagram
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10.2.
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 its particular application.
10.2.1.
Input Lines Characteristics
“MIC_MT” and “MIC_HF” differential microphone paths
Line Coupling
Line Type
Differential input voltage
Gain steps
Gain increment
Coupling capacitor
Differential input
resistance
Input capacitance
AC*
Balanced
≤ 1,03Vpp @ Mic G=0dB
6dB per step
≥ 100nF
50KΩ
• 10pF
(*) 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 the useful input signal will be halved in Single Ended Input
configuration.
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10.2.2.
Output Lines Characteristics
TIP:
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 a 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:
Ear_MT” lines can directly drive a 16Ω load at –12dBFS (**) in Differential
• the “Ear_MT
Ear_MT
configuration
• the “Ear_HF
Ear_HF” lines can directly drive a 4Ω load in Differential 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
0dBFS normalized gain
AC single-ended
DC differential
3,7 Vpp differential
output load resistance
≥ 16 Ω @ -12dBFS
internal output resistance
4Ω (typical)
signal bandwidth
150 - 4000 Hz @ -3 dB
maximal full scale
differential output voltage
differential output voltage
3,7 Vpp (typical)
Rload=open circuit
925mVpp / Rload=16Ω
@ -12dBFS
volume increment
2 dB per step
volume steps
10
“EAR_HF” Output Lines
line coupling
output load resistance
AC single-ended
DC differential
≥8Ω
signal bandwidth
150 - 4000 Hz @ -3 dB
maximal output power
@ battery voltage ≥ 3,6V
volume increment
0.35 Wrms /8 Ω
volume steps
10
2 dB per step
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11.
General Purpose I/O
The general purpose I/O pads can be configured to act in three different ways:
• input
• output
• alternate function (internally controlled)
Input pads can 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 GE864-QUAD
Automotive V2 firmware and acts depending on the function implemented. For Logic
levels please refer to chapter 8.
The following GPIO are available on the GE864-QUAD Automotive V2:
Type
Input /
output
current
Default
State
State
during
Reset
GPIO04 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
I/O
GPIO06 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
Ball
Signal
I/O
B3
GPIO_04
I/O
B5
GPIO_06
Function
Note
Alternate function (RF
Transmission Control)
Alternate function
(ALARM)
Alternate function (JDR)
E6
GPIO_01
I/O
GPIO01 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
HIGH
(see Fig.01)
H3
GPIO_08
I/O
GPIO08 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
PCM_TX
H5
GPIO_02
I/O
GPIO02 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
PCM_WAO
K7
GPIO_03
I/O
GPIO03 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
K8
GPIO_05
I/O
GPIO05 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
L9
GPIO_07
I/O
GPIO07 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
PCM_RX
Alternate function
(RFTXMON)
Alternate function
(BUZZER)
D7
GPIO_09 /
PCM_CLK
I/O
GPIO09 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
PCM audio *
x = undefined status
Not all GPIO pads support all these three modes:
• GPIO1 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)
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11.1.
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 GE864GE864-QUAD
Automotive V2 interface circuits:
Absolute Maximum Ratings
Parameter
Input level on any digital pin when on
Min
-0.3V
Max
+3.1V
Input voltage on analog pins when on
-0.3V
+3.0 V
Operating Range - Interface levels (2.8V CMOS)
Min
Max
Level
Input high level
2.1V
3.1V
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
levels (1
(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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11.2.
Using a GPIO Pad as INPUT
The GPIO pads, when used as inputs, can be connected to a digital output of another
device and report its status, provided this device has interface levels compatible with
the 2.8V CMOS levels of the GPIO.
If the digital output of the device to be connected with the GPIO input pad has interface
levels different from the 2.8V CMOS, then it can be buffered with an open collector
transistor with a 47K pull up to 2.8V.
11.3.
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
therefore the pull-up resistor may be omitted.
The illustration below shows the base circuit of a push-pull stage:
11.4.
Using the RF Transmission Control GPIO4
The GPIO4 pin, when configured as RF Transmission Control Input, permits to disable
the Transmitter when the GPIO is set to Low by the application.
In the design is necessary to add a pull up resistor (47K to PWRMON);
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11.5.
Using the RFTXMON Output GPIO5
The GPIO5 pin, when configured as RFTXMON Output, is controlled by the GE864-QUAD
Automotive V2 module and will rise when the transmitter is active and fall after the
transmitter activity is completed.
The TXMON pin behaviour can be configured using the AT command.
# TXMONMODE
Refer to AT Commands Reference Guide 80000ST10025a for the full description of this
command.
For example, if a call is started, the line will be HIGH during all the conversation and it
will be again LOW after hanged up.
The line rises up 300ms before first TX burst and will became again LOW from 500ms
to 1sec after last TX burst.
11.6.
Using the Alarm Output GPIO6
The GPIO6 pad, when configured as Alarm Output, is controlled by the GE864-QUAD
Automotive V2 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 GE864-QUAD Automotive V2 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 and the GE864-QUAD Automotive V2 during sleep periods, dramatically
reducing the sleep consumption to few µA.
In battery-powered devices this feature will greatly improve the autonomy of the device.
NOTE:
During RESET the line is set to HIGH logic level.
11.7.
Using the Buzzer Output GPIO7
The GPIO7 pad, when configured as Buzzer Output, is controlled by the GE864-QUAD
Automotive V2 module and will drive with appropriate square waves a Buzzer driver.
This permits to your application to easily implement Buzzer feature with ringing tones
or melody played at the call incoming, tone playing on SMS incoming or simply playing
a tone or melody when needed by your application.
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A sample interface scheme is included below to give you an idea of how to interface a
Buzzer to the GPIO7:
NOTE:
To correctly drive a buzzer a driver must be provided, its characteristics depend on the
Buzzer and for them refer to your buzzer vendor.
11.8.
Indication of network service availability
The STAT_LED pin status shows information on the network service availability and
Call status.
In the GE864-QUAD Automotive V2 modules, the STAT_LED usually needs an external
transistor to drive an external LED.
Therefore, the status indicated in the following table is reversed with respect to the pin
status.
LED status
Permanently off
Device Status
Device off
Fast blinking
(Period 1s, Ton 0,5s)
Slow blinking
(Period 3s, Ton 0,3s)
Permanently on
Net search / Not registered /
turning off
Registered full service
a call is active
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A schematic example could be:
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11.9.
RTC Bypass out
The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of
the digital part, allowing having only RTC going on when all the other parts of the device
are off.
To this power output a backup capacitor can be added in order to increase the RTC
autonomy during power off of the battery. NO Devices must be powered from this pin.
11.10.
External SIM Holder Implementation
Please refer to the related User Guide (SIM Holder Design Guides, 80000NT10001a).
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12.
DAC and ADC section
12.1.
DAC Converter
12.1.1.
Description
The GE864-QUAD Automotive V2 module provides a Digital to Analog Converter. The
signal (named DAC_OUT) is available on BGA Ball C7 of the GE864-QUAD Automotive V2
module and on pin 17 of PL102 on EVK2 Board (CS1302).
The on board DAC is a 10-bit converter, able to generate a analogue value based a
specific input in the range from 0 up to 1023. However, an external low-pass filter is
necessary
Voltage range (filtered)
Range
Min
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.
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12.1.2.
Enabling DAC
An AT command is available to use the DAC function.
The command is AT#DAC[=[,]]
 - scale factor of the integrated output voltage (0..1023 – 10 bit precision)
it must be present if =1
Refer to SW User Guide or AT Commands Reference Guide for the full description of
this function.
NOTE:
The DAC frequency is selected internally. D/A converter must not be used during
POWERSAVING.
12.1.3.
Low Pass Filter Example
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12.2.
ADC Converter
12.2.1.
Description
The on board A/D are 11-bit converter. They are able to read a voltage level in the range
of 0÷1.9 volts applied on the ADC pin input, store and convert it into 11 bit word.
Input Voltage range
AD conversion
Resolution
Min
Max
1.9
11
<1
Units
Volt
bits
mV
The GE864-QUAD Automotive V2 module provides 2 Analog to Digital Converters. The
input lines are:
ADC_IN1 available on Ball J11 and Pin 19 of PL102 on EVK2 Board.
ADC_IN2 available on Ball H11 and Pin 20 of PL102 on EVK2 Board.
12.2.2.
Using ADC Converter
An AT command is available to use the ADC function.
The command is AT#ADC=1,2
The read value is expressed in mV
Refer to SW User Guide or AT Commands Reference Guide for the full description of
this function.
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13.
Mounting the GE864-QUAD Automotive V2 on your
Board
13.1.
General
The Telit GE864V2
GE864-QUAD Automotive V
2 modules have been designed in order to be
compliant with a standard lead-free SMT process.
13.2.
Module finishing & dimensions
Pin A1
LeadLead -free Alloy:
Surface finishing Sn/Ag/Cu for all solder pads
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13.3.
Recommended foot print for the application
Top View
NOTE:
In the customer application, the region under INHIBIT WIRING *1 (see figure) must be
clear from signal or ground paths.
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13.4.
Debug of the GE864 in production
To test and debug the mounting of the GE864, we strongly recommend to foreseen test
pads on the host PCB, in order to check the connection between the GE864 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:
•
•
•
•
•
•
•
•
•
13.5.
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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13.6.
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]
2,5
1,150
1 ± 0.05
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It is not recommended to place via or microvia not covered by solder resist in an area of
1,6mm diameter around the pads unless it carries the same signal of the pad itself.
(see following figure).
Holes in pad are allowed only for blind holes and not for through holes.
Recommendations for PCB pad surfaces:
Finish
Layer thickness [µm]
Electro-less Ni / 3 –7 /
Immersion Au
0.05 – 0.15
Properties
good solder ability protection, high
shear force values
The PCB must be able to resist the higher temperatures which are occurring at the
lead-free process. This issue should be discussed with the PCB-supplier. Generally,
the wettability of tin-lead solder paste on the described surface plating is better
compared to lead-free solder paste.
13.7.
Solder paste
paste
Solder paste
Lead free
Sn/Ag/Cu
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GE864GE864-QUAD Automotive V2 Hardware User Guide
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13.7.1.
GE864 Solder reflow
The following is the recommended solder reflow profile
Profile Feature
Average ramp-up rate (TL to TP)
Preheat
– Temperature Min (Tsmin)
– Temperature Max (Tsmax)
– Time (min to max) (ts)
Tsmax to TL
– Ramp-up Rate
Time maintained above:
– Temperature (TL)
– Time (tL)
Peak Temperature (Tp)
Time within 5°C of actual Peak
Temperature (tp)
Ramp-down Rate
Time 25°C to Peak Temperature
PbPb - Free Assembly
3°C/second max
150°C
200°C
60-180 seconds
3°C/second max
217°C
60-150 seconds
245 +0/-5°C
10-30 seconds
6°C/second max.
8 minutes max.
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GE864GE864-QUAD Automotive V2 Hardware User Guide
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NOTE:
NOTE
All temperatures refer to topside of the package, measured on the package body
surface.
WARNING:
GE864 module can accept only one reflow process
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GE864GE864-QUAD Automotive V2 Hardware User Guide
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14.
Packing system
The Telit GE864 modules are packaged on trays of 20 pieces each. This is especially
suitable for the GE864 according to SMT processes for pick & place movement
requirements.
Section A-A
The size of the tray is: 329 x 176mm
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GE864GE864-QUAD Automotive V2 Hardware User Guide
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WARNING:
WARNING
These trays can withstand at the maximum temperature of 65° C.
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GE864GE864-QUAD Automotive V2 Hardware User Guide
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14.1.
GE864 orientation on the tray
14.2.
Moisture sensibility
The level of moisture sensibility of GE864 module is “3”, in according with standard
IPC/JEDEC J-STD-020, take care all the relatives requirements for using this kind of
components.
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GE864GE864-QUAD Automotive V2 Hardware User Guide
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15.
Conformity Assessment Issues
The Telit GE864
GE864 -QUAD Automotive V2 Module 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
harmonised standards with the final involvement of a Notified Body.
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
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),
(b) Safety and EMC
respectively, and any relevant Article 3.3 requirements.
This Hardware User Guide contain all the information you may need for developing a
product meeting the R&TTE Directive.
Furthermore the GE864
GE864 - QUAD Automotive V2 Module 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 GE864
GE86 4-QUAD Automotive V2 Module 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
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:
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GE864GE864-QUAD Automotive V2 Hardware User Guide
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•
•
•
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.
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GE864GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
16.
SAFETY RECOMMANDATIONS
READ CAREFULLY
Be sure the use of this product is allowed in the country and in the environment
required. The use of this product may be dangerous and has to be avoided in the
following areas:
•
•
Where it can interfere with other electronic devices in environments such as
hospitals, airports, aircrafts, etc
Where there is risk of explosion such as gasoline stations, oil refineries, etc
It is responsibility of the user to enforce the country regulation and the specific
environment regulation.
Do not disassemble the product; any mark of tampering will compromise the warranty
validity.
We recommend following the instructions of the hardware user guides for a correct
wiring of the product. The product has to be supplied with a stabilized voltage source
and the wiring has to be conforming to the security and fire prevention regulations.
The product has to be handled with care, avoiding any contact with the pins because
electrostatic discharges may damage the product itself. Same cautions have to be
taken for the SIM, checking carefully the instruction for its use. Do not insert or remove
the SIM when the product is in power saving mode.
The system integrator is responsible of the functioning of the final product; therefore,
care has to be taken to the external components of the module, as well as of any
project or installation issue, because the risk of disturbing the GSM network or external
devices or having impact on the security. Should there be any doubt, please refer to the
technical documentation and the regulations in force.
Every module has to be equipped with a proper antenna with specific characteristics.
The antenna has to be installed with care in order to avoid any interference with other
electronic devices and has to guarantee a minimum distance from the body (20 cm). In
case of this requirement cannot be satisfied, the system integrator has to assess the
final product against the SAR regulation EN 50360.
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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://europa.eu.int/comm/enterprise/rtte/dir99-5.htm
The text of the Directive 99/05 regarding telecommunication equipments is available,
while the applicable Directives (Low Voltage and EMC) are available at:
http://europa.eu.int/comm/enterprise/electr_equipment/index_en.htm
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