Telit Communications S p A GE864QA2 Quadband GSM/ GPRS Module User Manual GE864 Harware User Guide

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GE864-QUAD Automotive V2
Hardware User Guide
1vv0300840 Rev.0.1 - 24/11/09
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
This document is relating to the following products:
GE864-QUAD Automotive V2
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page 2 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
Contents
Overview ...........................................................................................................................6
GE864-QUAD Automotive V2 Mechanical Dimensions.................................................7
GE864-QUAD Automotive V2 module connections.......................................................8
3.1
PIN-OUT...................................................................................................................................8
3.1.1
Hardware Commands ....................................................................................................14
4.1
Turning ON the GE864-QUAD Automotive V2 module......................................................14
4.2
Turning OFF the GE864-QUAD Automotive V2..................................................................17
4.2.1
4.2.2
BGA Balls Layout........................................................................................................................... 12
Hardware shutdown....................................................................................................................... 17
Hardware Unconditional Restart.................................................................................................... 18
Power Supply .................................................................................................................20
5.1
Power Supply Requirements ...............................................................................................20
5.2
Power Consumption.............................................................................................................21
5.3
General Design Rules ..........................................................................................................22
5.3.1
Electrical Design Guidelines .......................................................................................................... 22
5.3.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 22
5.3.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 23
5.3.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 25
5.3.2
Thermal Design Guidelines ........................................................................................................... 26
5.3.3
Power Supply PCB layout Guidelines ........................................................................................... 27
Antenna...........................................................................................................................28
6.1
GSM Antenna Requirements ...............................................................................................28
6.2
GSM Antenna - PCB line Guidelines...................................................................................29
6.3
GSM Antenna - Installation Guidelines ..............................................................................30
Logic level specifications..............................................................................................31
7.1
Reset signal ..........................................................................................................................32
Serial Ports .....................................................................................................................33
8.1
MODEM SERIAL PORT.........................................................................................................33
8.2
RS232 level translation ........................................................................................................35
8.3
UART level translation .........................................................................................................37
Audio Section Overview ................................................................................................40
9.1
INPUT LINES (Microphone) .................................................................................................41
9.1.1
Short description............................................................................................................................ 41
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GE864-QUAD Automotive V2 Hardware User Guide
9.1.2
9.2
1vv0300840 Rev.0.1 24/11/09
Input Lines Characteristics ............................................................................................................ 42
OUTPUT LINES (Speaker) ....................................................................................................43
9.2.1
9.2.2
Short description............................................................................................................................ 43
Output Lines Characteristics.......................................................................................................... 44
10 General Purpose I/O.......................................................................................................45
10.1
GPIO Logic levels .............................................................................................................46
10.2
Using a GPIO Pad as INPUT.............................................................................................47
10.3
Using a GPIO Pad as OUTPUT.........................................................................................47
10.4
Using the RF Transmission Control GPIO4....................................................................47
10.5
Using the RFTXMON Output GPIO5 ................................................................................48
10.6
Using the Alarm Output GPIO6........................................................................................48
10.7
Using the Buzzer Output GPIO7 ......................................................................................48
10.8
Indication of network service availability .......................................................................50
10.9
RTC Bypass out ................................................................................................................51
10.10
External SIM Holder Implementation ..............................................................................51
11 DAC and ADC section....................................................................................................52
11.1
11.1.1
11.1.2
11.1.3
11.2
11.2.1
11.2.2
11.3
11.3.1
11.3.2
11.3.3
11.3.4
11.3.5
11.3.6
11.3.7
11.3.8
11.4
11.4.1
11.4.2
DAC Converter ..................................................................................................................52
Description ..................................................................................................................................... 52
Enabling DAC ................................................................................................................................ 53
Low Pass Filter Example ............................................................................................................... 53
ADC Converter ..................................................................................................................54
Description ..................................................................................................................................... 54
Using ADC Converter .................................................................................................................... 54
Mounting the GE864-QUAD Automotive V2 on your Board..........................................55
General .......................................................................................................................................... 55
Module finishing & dimensions ...................................................................................................... 55
Recommended foot print for the application (GE864) ................................................................... 56
Debug of the GE864 in production ................................................................................................ 57
Stencil ............................................................................................................................................ 57
PCB pad design............................................................................................................................. 58
Solder paste................................................................................................................................... 59
GE864 Solder reflow...................................................................................................................... 60
Packing system.................................................................................................................61
GE864 orientation on the tray........................................................................................................ 62
Moisture sensibility ........................................................................................................................ 62
12 Conformity Assessment Issues ....................................................................................63
13 SAFETY RECOMMANDATIONS.....................................................................................64
14 Document Change Log ..................................................................................................65
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page 4 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
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
application note.
All rights reserved.
© 2008 Telit Communications S.p.A.
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page 5 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
1 Overview
The aim of this document is the description of some hardware solutions useful for developing a product with the
Telit GE864-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 GE864-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.
NOTICE
(EN) 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.
(IT) L’integrazione del modulo cellulare GSM/GPRS GE864-QUAD Automotive V2 all’interno
dell’applicazione dell’utente dovrà rispettare le indicazioni progettuali descritte in questo manuale.
(DE) Die integration des GE864-QUAD Automotive V2 GSM/GPRS Mobilfunk-Moduls in ein Gerät muß
gemäß der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen
(SL) Integracija GSM/GPRS GE864-QUAD Automotive V2 modula v uporabniški aplikaciji bo morala
upoštevati projektna navodila, opisana v tem piročniku.
(SP) La utilización del modulo GSM/GPRS GE864-QUAD Automotive V2 debe ser conforme a los usos para
los cuales ha sido deseñado descritos en este manual del usuario.
(FR) L’intégration du module cellulaire GSM/GPRS GE864-QUAD Automotive V2 dans l’application de
l’utilisateur sera faite selon les règles de conception décrites dans ce manuel.
GE864-QUAD Automotive
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 6 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
2 GE864-QUAD Automotive V2
Mechanical Dimensions
The Telit GE864-QUAD Automotive V2 module overall dimension are:
•
•
•
Length:
Width:
Thickness:
30 mm
30 mm
2.9 mm
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page 7 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
3 GE864-QUAD Automotive V2 module
connections
3.1 PIN-OUT
Ball
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
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CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
page 8 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
Ball
Signal
I/O
Function
Internal PULL UP
Type
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
Miscellaneous Functions
A2
RESET*
Reset input
D8
STAT_LED
Status indicator led
CMOS 1.8V
E2
VRTC
AO
VRTC
Power
F3
32K_IN
32.768 KHz Square Wave Input
CMOS 1.8V
Pull up to VBATT
J5
ON_OFF*
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.
L8
PWRMON
Power ON Monitor
CMOS 2.8V
L4
Antenna
Antenna output – 50 ohm
RF
Telit GPIO
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
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
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GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
Ball
Signal
I/O
Function
Internal PULL UP
Type
L2
GND
Ground
Power
L3
GND
Ground
Power
L6
GND
Ground
Power
L11
GND
Ground
Power
RESERVED
A3
Reserved
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
F4
Reserved
F5
Reserved
F8
Reserved
G1
Reserved
G2
Reserved
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page 10 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
Ball
Signal
I/O
Function
G3
Reserved
G4
Reserved
G5
Reserved
G6
Reserved
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: 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
J5
E7
A2
H8
F3
signal
VBATT
GND
ON/OFF*
TXD
RESET*
RXD
32K_IN
to GND
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page 11 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
3.1.1 BGA Balls Layout
TOP VIEW
GND
GND
GND
VBATT
VBATT
GND
RESET*
VRTC
GND
VBATT
VBATT
GND
GPIO_04
32K_IN
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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page 12 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
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 13 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
4 Hardware Commands
4.1 Turning ON the GE864-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.
The maximum current that can be drained from the ON* pad is 0,1 mA.
A simple circuit to do it is:
ON*
R1
Q1
Power ON impulse
R2
GND
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 900ms the line
raised up the device could be considered powered on.
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page 14 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
A flow chart showing the proper turn on procedure is displayed below:
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page 15 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
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):
10k
ON*
+1.8V ... 5V
1s
2- Let's assume you need to drive the ON* pad directly with an ON/OFF button:
ON*
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GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
4.2 Turning OFF the GE864-QUAD Automotive V2
The turning off of the device can be done in three ways:
• by software command (see GE864-QUAD Automotive V2 Software User Guide)
• by hardware shutdown
• by Hardware Unconditional Restart
When the device is shut down by software command or by hardware shutdown, it issues to the
network a detach request that informs the network that the device will not be reachable any more.
4.2.1 Hardware shutdown
To turn OFF the GE864-QUAD Automotive V2 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.
TIP: To check if the device has powered off, the hardware line PWRMON should be monitored. When PWRMON goes
low, the device has powered off.
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GE864-QUAD Automotive V2 Hardware User Guide
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4.2.2 Hardware Unconditional Restart
To unconditionally Restart the GE864-QUAD Automotive V2, the pad RESET* must be tied low for at
least 200 milliseconds and then released.A simple circuit to do it is:
RESET*
Unconditional Restart
impulse
GND
The following flow chart shows the proper Reset procedure:
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page 18 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
NOTE: don't 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 Automotive V2 power regulator and improper functioning of
the module. The line RESET* must be connected only in open collector configuration.
TIP: The unconditional hardware Restart should be always implemented on the boards and software should use it
as an emergency exit procedure.
For example:
1- Let's assume you need to drive the RESET* pad with a totem pole output from +1.8V up to +5V
microcontroller (uP_OUT2):
10k
RESET*
1.8V ... 5V
NOTE: The RESET# signal is internally pulled up so the pin can be left floating if not used
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page 19 of 65
GE864-QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.0.1 24/11/09
5 Power Supply
The power supply circuitry and board layout are a very important part in the full product design and
they strongly reflect on the product overall performances, hence read carefully the requirements and
the guidelines that will follow for a proper design.
5.1 Power Supply Requirements
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: 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
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page 20 of 65
GE864-QUAD Automotive V2 Hardware User Guide
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5.2 Power Consumption
The GE864-QUAD Automotive V2 power consumptions are:
GE864-QUAD Automotive V2
Mode
Average (mA)
Mode description
Stand
by
mode; no call in progress
IDLE mode
Normal mode: full functionality of the module
AT+CFUN=1
23,9
AT+CFUN=4
22
AT+CFUN=0 or
AT+CFUN=5
7,20 / 3,561
Disabled TX and RX; module is not registered on the
network
Power saving: CFUN=0 module registered on the network
and can receive voice call or an SMS; but it is not possible
to send AT commands; module wakes up with an
unsolicited code (call or SMS) or rising RTS line. CFUN=5
full functionality with power saving; module registered on
the network can receive incoming calls and SMS
RX mode
1 slot in downlink
52,3
2 slot in downlink
65,2
3 slot in downlink
78,6
4 slot in downlink
88,4
GSM TX and RX mode
Min power level
78,1
Max power level
200,1
GPRS (class 10) TX and RX mode
Min power level
123,7
Max power level
370,8
GSM Receiving data mode
GSM 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.
Worst/best case depends on network configuration and is not under module control
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5.3 General Design Rules
The principal guidelines for the Power Supply Design embrace three different design steps:
• the electrical design
• the thermal design
• the PCB layout.
5.3.1 Electrical Design Guidelines
The electrical design of the power supply depends strongly from the power source where this power is
drained. We will distinguish them into three categories:
• +5V input (typically PC internal regulator output)
• +12V input (typically automotive)
• Battery
5.3.1.1 + 5V input Source Power Supply Design Guidelines
•
•
•
•
•
The desired output for the power supply is 3.8V, hence there's not a big difference between the
input source and the desired output and a linear regulator can be used. A switching power supply
will not be suited because of the low drop out requirements.
When using a linear regulator, a proper heat sink shall be provided in order to dissipate the power
generated.
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks close to the 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:
5.3.1.2 + 12V input Source Power Supply Design Guidelines
•
•
•
•
•
•
•
•
The desired output for the power supply is 3.8V, hence due to the big difference between the input
source and the desired output, a linear regulator is not suited and shall not be used. A switching
power supply will be preferable because of its better efficiency especially with the 2A peak current
load represented by the 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.
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.
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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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5.3.1.3 Battery Source Power Supply Design Guidelines
•
The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is
4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit
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.
NOTE: 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 GE864-QUAD 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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5.3.2 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 GE864-QUAD Automotive
V2; you must ensure that your application can dissipate it.
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5.3.3 Power Supply PCB layout Guidelines
As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the
output to cut the current peaks and a protection diode on the input to protect the supply from spikes
and polarity inversion. The placement of these components is crucial for the correct working of the
circuitry. A misplaced component can be useless or can even decrease the power supply
performances.
•
•
•
•
•
•
•
•
The Bypass low ESR capacitor must be placed close to the Telit 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 300400 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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6 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.
6.1 GSM Antenna Requirements
As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE864QUAD Automotive V2 device shall fulfill the following requirements:
ANTENNA REQUIREMENTS
Depending by frequency band(s)
Frequency range
provided by the network operator, the
customer shall use the most suitable
antenna for that/those band(s)
70 MHz in GSM850, 80 MHz in
Bandwidth
GSM900, 170 MHz in DCS & 140
MHz PCS band
1.4dBi @900 and 3dBi @1800
Gain
1.4dBi @850 and 3dBi @1900
50 ohm
Impedance
> 2 W peak power
Input power
<= 10:1
VSWR absolute max
<= 2:1
VSWR recommended
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
50 ohm
Impedance
0,3 dB
Max Attenuation
No coupling with other signals allowed
Cold End (Ground Plane) of antenna shall be equipotential to
the GE864-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 1.4dBi @900, 3dBi
@1800, 1.4dBi @850 and 3dBi @1900 gain for mobile and fixed operating configurations.
6.2 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.
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;
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6.3 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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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 GE864-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 (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 (1.8V 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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7.1 Reset signal
Signal
RESET
Function
Phone reset
I/O
Bga Ball
A2
RESET is used to reset the GE864-QUAD Automotive V2 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: do not use this signal to power off the GE864-QUAD Automotive V2. Use the ON/OFF signal to
perform this function or the AT#SHDN 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
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)
8.1 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
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 GE864-QUAD Automotive V2 serial port are:
RS232
Pin
Number
Signal
GE864QUAD
Automotive
V2 Pad
Number
DCD - dcd_uart
D9
Name
Usage
Data Carrier Detect
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
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
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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8.2 RS232 level translation
In order to interface the Telit GE864-QUAD Automotive V2 with a PC com port or a RS232 (EIA/TIA232) application a level translator is required. This level translator must
ƒ invert the electrical signal in both directions
ƒ 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:
ƒ 5 driver
ƒ 3 receiver
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.
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:
8.3 UART
level
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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:
TO TELIT
MODULE
TIP: This logic IC for the level translator and 2.8V pull-ups (not the 5V one) can be powered directly from PWRMON
line of the GE864-QUAD Automotive V2. Note that the TC7SZ07AE has open drain output, therefore the resistor R2
is mandatory.
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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 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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9 Audio Section Overview
16
-12dBFS
16
audio2.skd
The Base Band Chip of the GE864-QUAD Automotive V2 Telit Module provides two different audio
blocks; both in transmit (Uplink) and in receive (Downlink) direction:
“MT lines” should be used for handset function,
“HF lines” is suited for hands -free function (car kit).
These two blocks can be active only one at a time, selectable by AXE hardware line or by AT
command.The audio characteristics are equivalent in transmit blocks, but are different in the receive
ones and this should be kept in mind when designing.
Single
ended
Ear_HF-
GE863-GPS Audio Paths
Ear_HF+
Mic_HF+
Mic_HF-
Ear_MT-
Balanced
23mVrms
365mV rms
+20dB
+10dB
-45dBV/Pa
0,33mV rms
50cm
7cm
-45dBV/Pa
3,3mV rms
Mic_MT-
Ear_MT+
Mic_MT+
GM863-GPS
Differential
Line-Out Drivers
Fully Differential
Power Buffers
EXTERNAL
AMPLIFIER
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9.1 INPUT LINES (Microphone)
9.1.1 Short description
The Telit GE864-QUAD Automotive V2 provides two audio paths in transmit section. Only one of the
two paths can be active at a time, selectable by AXE hardware line or by AT command.
You must keep in mind the different audio characteristics of the transmit blocks when designing:
The “MIC_MT” audio path should be used for handset function, while the “MIC_HF” audio path is
suited for hands-free function (car kit).
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 should
be balanced designed to reduce the common mode noise typically generated on the ground
plane. However also an unbalanced circuitry can be used for particular OEM application needs.
TIP: due to the difference in the echo canceller type, the “Mic_MT” audio path is suited for
Handset applications, while the “Mic_HF”audio path is suited for hands-free function (car kit).
The Earphone applications should be made using the “Mic_HF” audio path but DISABLING the
echo canceller by software AT command. If the echo canceller is left active with the Earphone,
then some echo might be introduced by the echo cancel algorithm.
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9.1.2 Input Lines Characteristics
“MIC_MT” 1st differential microphone path
Line Coupling
AC*
Line Type
Balanced
Coupling capacitor
≥ 100nF
Differential input resistance
Differential input voltage
Microphone nominal sensitivity
50kΩ
≤ 1,03Vpp (365mVrms)
-45 dBVrms/Pa
Analog gain suggested
+ 20dB
Echo canceller type
Handset
“MIC_HF” 2nd differential microphone path
Line Coupling
AC*
Line Type
Balanced
Coupling capacitor
≥ 100nF
Differential input resistance
Differential input voltage
Microphone nominal sensitivity
Analog gain suggested
Echo canceller type
50kΩ
≤ 65mVpp (23mVrms)
-45 dBVrms/Pa
+10dB
Car kit hands-free
(*) WARNING: AC means that the signals from microphone has to be connected to input lines
of the module by a CAPACITOR, which value must be ≥ 100nF. Not respecting this constraint,
the input stage will be damaged.
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9.2 OUTPUT LINES (Speaker)
9.2.1 Short description
The Telit GE864-QUAD Automotive V2 provides two audio paths in receive section. Only one of the
two paths can be active at a time, selectable by AXE hardware line or by AT command.
You must keep in mind the different audio characteristics of the receive blocks when designing:
Æ the “EAR_MT” lines EPN1 and EPP1 are the Differential Line-Out Drivers ; they can drive an
external amplifier or directly a 16 Ω earpiece at –12dBFS (*) ;
Æ the “EAR_HF” lines EPPA1_2 and EPPA2 are the Fully Differential Power Buffers ; they can
directly drive a 16Ω speaker in differential (balanced) or single ended (unbalanced) operation mode .
(*) FS : acronym of Full Scale. It is equal to 0dB, the maximum Hardware Analog Receive Gain of
BaseBand Chip.
The “EAR_MT” audio path should be used for handset function, while the “EAR_HF” audio path is
suited for hands-free function (car kit).
Both receiver outputs are B.T.L. type (Bridged Tie Load) and the OEM circuitry shall be designed
bridged to reduce the common mode noise typically generated on the ground plane and to get the
maximum power output from the device; however also a single ended circuitry can be designed for
particular OEM application needs.
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9.2.2 Output Lines Characteristics
“EAR_MT” Differential Line-out Drivers Path
Line Coupling
DC
Line Type
Bridged
Output load resistance
≥ 14 Ω
Internal output resistance
Signal bandwidth
4 Ω (typical)
150 – 4000 Hz @ -3 dB
Differential output voltage
SW volume level step
Number of SW volume steps
328mVrms /16 Ω @ -12dBFS
- 2 dB
10
“EAR_HF” Power Buffers Path
Line Coupling
DC
Line Type
Bridged
Output load resistance
≥ 14 Ω
Internal output resistance
Signal bandwidth
4 Ω ( >1,7 Ω )
150 – 4000 Hz @ -3 dB
Max Differential output voltage
1310 mVrms (typ, open circuit)
Max Single Ended output voltage
656 mVrms (typ, open circuit)
SW volume level step
Number of SW volume steps
- 2 dB
10
For more detailed information about audio please refer to the Audio Settings Application Note
80000NT10007a.
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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)
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 7.
The following GPIO are available on the GE864-QUAD Automotive V2:
Ball
Signal
I/O
Function
Type
Input /
output
current
Default
State
State
during
Reset
B3
GPIO_04
I/O
GPIO04 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
B5
GPIO_06
I/O
GPIO06 Configurable GPIO
CMOS 2.8V
1uA / 1mA
INPUT
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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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 GE864-QUAD Automotive V2 interface
circuits:
Absolute Maximum Ratings
Parameter
Min
Max
Input level on any digital pin when on
-0.3V
+3.1V
Input voltage on analog pins when on
-0.3V
+3.0 V
Operating Range - Interface 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 (1.8V 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 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.
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 therefore the pull-up resistor may be
omitted.
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.
In the design is necessary to add a pull up resistor (47K to PWRMON);
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10.5 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.
10.6 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.
10.7 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.
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10.8 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
Device Status
Permanently off
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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10.9 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.
10.10 External SIM Holder Implementation
Please refer to the related User Guide (SIM Holder Design Guides, 80000NT10001a).
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11 DAC and ADC section
11.1 DAC Converter
11.1.1 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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11.1.2 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.
11.1.3 Low Pass Filter Example
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11.2
ADC Converter
11.2.1 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.
11.2.2 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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11.3 Mounting the GE864-QUAD Automotive V2 on
your Board
11.3.1 General
The Telit GE864-QUAD Automotive V2 modules have been designed in order to be compliant with a
standard lead-free SMT process.
11.3.2 Module finishing & dimensions
Pin A1
Lead-free Alloy:
Surface finishing Sn/Ag/Cu for all solder pads
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11.3.3 Recommended foot print for the application (GE864)
Top View
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11.3.4 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:
• TXD
• RXD
• ON/OFF
• RESET
• GND
• VBATT
• TX_TRACE
• RX_TRACE
• PWRMON
11.3.5 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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11.3.6 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.
11.3.7 Solder paste
Solder paste
Lead free
Sn/Ag/Cu
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11.3.8 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
Pb-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.
NOTE: All temperatures refer to topside of the package, measured on the package body surface.
NOTE: GE864 module can accept only one reflow process
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11.4 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
NOTE: These trays can withstand at the maximum temperature of 65° C.
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11.4.1 GE864 orientation on the tray
11.4.2 Moisture sensibility
The level of moisture sensibility of GE864 module is “3”, in according with standard IPC/JEDEC J-STD020, take care all the relatives requirements for using this kind of components.
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12 Conformity Assessment Issues
The GE864-QUAD Automotive V2 module is assessed to be conform to the R&TTE Directive as
stand-alone products, so If the module is installed in conformance with Dai Telecom installation
instructions require 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 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.
The GE864-QUAD Automotive V2 module is conform with the following European Union Directives:
• R&TTE Directive 1999/5/EC (Radio Equipment & Telecommunications Terminal Equipments)
• Low Voltage Directive 73/23/EEC and product safety
• Directive 89/336/EEC for conformity for EMC
In order to satisfy the essential requisite of the R&TTE 99/5/EC directive, the GE864-QUAD
Automotive V2 module is compliant with the following standards:
• GSM (Radio Spectrum). Standard: EN 301 511 and 3GPP 51.010-1
• EMC (Electromagnetic Compatibility). Standards: EN 301 489-1 and EN 301 489-7
• LVD (Low Voltage Directive) Standards: EN 60 950
In this document and the Hardware User Guide, Software User Guide all the information you may
need for developing a product meeting the R&TTE Directive is included.
The GE864-QUAD Automotive V2 module is conform with the following US Directives:
• Use of RF Spectrum. Standards: FCC 47 Part 24 (GSM 1900)
• EMC (Electromagnetic Compatibility). Standards: FCC47 Part 15
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 co-located or operating in
conjunction with any other antenna or transmitter.
- The system antenna(s) used for this module must not exceed 1.4dBi @900, 3dBi @1800, 1.4dBi
@850 and 3dBi @1900 gain 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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13 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.
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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14 Document Change Log
Revision
Date
Changes
ISSUE#0
ISSUE#0.1
01/07/08
24/11/09
First Release from rev 7 of 1vv0300779
Antenna Gain values changed at section 6 and 12.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 65 of 65

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