Telit Wireless Solutions GE864-AUTO Installation manual

GE864-AUTO Hardware User Guide
1vv0300779 Rev.0 - 20/06/08

GE864-AUTO Hardware User Guide
1vv0300779 Rev.0 - 20/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 2 of 62
This document is relating to the following products:
GE864-AUTO 3990250701

GE864-AUTO Hardware User Guide
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Contents
1Overview ...........................................................................................................................6
2GE864-AUTO Mechanical Dimensions ...........................................................................7
3GE864-AUTO module connections .................................................................................8
3.1 PIN-OUT...................................................................................................................................8
3.1.1 BGA Balls Layout........................................................................................................................... 12
4Hardware Commands ....................................................................................................14
4.1 Turning ON the GE864-AUTO module ................................................................................14
4.2 Turning OFF the GE864-AUTO ............................................................................................16
4.2.1 Hardware shutdown....................................................................................................................... 16
4.2.2 Hardware Unconditional Restart.................................................................................................... 16
5Power Supply .................................................................................................................18
5.1 Power Supply Requirements...............................................................................................18
5.2 General Design Rules ..........................................................................................................20
5.2.1 Electrical Design Guidelines .......................................................................................................... 20
5.2.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 20
5.2.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 21
5.2.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 23
5.2.2 Thermal Design Guidelines ........................................................................................................... 24
5.2.3 Power Supply PCB layout Guidelines ........................................................................................... 25
6Antenna...........................................................................................................................26
6.1 GSM Antenna Requirements ...............................................................................................26
6.2 GSM Antenna - PCB line Guidelines...................................................................................27
6.3 GSM Antenna - Installation Guidelines ..............................................................................28
7Logic level specifications..............................................................................................29
7.1 Reset signal ..........................................................................................................................30
8Serial Ports .....................................................................................................................31
8.1 MODEM SERIAL PORT.........................................................................................................31
8.2 RS232 level translation ........................................................................................................33
8.3 5V UART level translation....................................................................................................35
9Audio Section Overview ................................................................................................37
9.1 INPUT LINES (Microphone) .................................................................................................38
9.1.1 Short description............................................................................................................................ 38
9.1.2 Input Lines Characteristics ............................................................................................................ 39

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9.2 OUTPUT LINES (Speaker)....................................................................................................40
9.2.1 Short description............................................................................................................................ 40
9.2.2 Output Lines Characteristics.......................................................................................................... 41
10 General Purpose I/O.......................................................................................................42
10.1 GPIO Logic levels .............................................................................................................44
10.2 Using a GPIO Pad as INPUT.............................................................................................45
10.3 Using a GPIO Pad as OUTPUT.........................................................................................45
10.4 Using the RF Transmission Control GPIO4....................................................................45
10.5 Using the RFTXMON Output GPIO5 ................................................................................46
10.6 Using the Alarm Output GPIO6........................................................................................47
10.7 Using the Buzzer Output GPIO7 ......................................................................................47
10.8 Indication of network service availability .......................................................................48
10.9 RTC Bypass out ................................................................................................................49
10.10 External 32KHz oscillator.................................................................................................49
11 ADC section....................................................................................................................51
11.1 ADC Converter ..................................................................................................................51
11.1.1 Description..................................................................................................................................... 51
11.1.2 Using ADC Converter .................................................................................................................... 51
11.2 Mounting the GE864-AUTO on your Board ....................................................................52
11.2.1 General .......................................................................................................................................... 52
11.2.2 Module finishing & dimensions ...................................................................................................... 52
11.2.3 Recommended foot print for the application (GE864) ................................................................... 53
11.2.4 Debug of the GE864 in production ................................................................................................54
11.2.5 Stencil ............................................................................................................................................ 54
11.2.6 PCB pad design............................................................................................................................. 55
11.2.7 Solder paste................................................................................................................................... 56
11.2.8 GE864 Solder reflow...................................................................................................................... 57
11.3 Packing system.................................................................................................................58
11.3.1 GE864 orientation on the tray........................................................................................................ 59
11.3.2 Moisture sensibility ........................................................................................................................ 59
12 Conformity Assessment Issues....................................................................................60
13 SAFETY RECOMMANDATIONS.....................................................................................61
14 Document Change Log ..................................................................................................62

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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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1 Overview
The aim of this document is the description of some hardware solutions useful for developing a product with the
Telit GE864-AUTO module.
In this document all the basic functions of a mobile phone will be taken into account; for each one of them a
proper hardware solution will be suggested and eventually the wrong solutions and common errors to be
avoided will be evidenced. Obviously this document cannot embrace the whole hardware solutions and products
that may be designed. The wrong solutions to be avoided shall be considered as mandatory, while the
suggested hardware configurations shall not be considered mandatory, instead the information given shall be
used as a guide and a starting point for properly developing your product with the Telit GE864-AUTO module.
For further hardware details that may not be explained in this document refer to the Telit GE864-AUTO Product
Description document where all the hardware information is reported.
NOTICE
(EN) The integration of the GSM/GPRS GE864-AUTO 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-AUTO all’interno dell’applicazione dell’utente
dovrà rispettare le indicazioni progettuali descritte in questo manuale.
(DE) Die integration des GE864-AUTO GSM/GPRS Mobilfunk-Moduls in ein Gerät muß gemäß der in
diesem Dokument beschriebenen Kunstruktionsregeln erfolgen
(SL) Integracija GSM/GPRS GE864-AUTO modula v uporabniški aplikaciji bo morala upoštevati projektna
navodila, opisana v tem piročniku.
(SP) La utilización del modulo GSM/GPRS GE864-AUTO 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-AUTO dans l’application de l’utilisateur sera
faite selon les règles de conception décrites dans ce manuel.
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.
GE864-AUTO

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2 GE864-AUTO Mechanical Dimensions
The Telit GE864-AUTO module overall dimension are:
•Length: 30 mm
•Width: 30 mm
•Thickness: 2.8 mm

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3 GE864-AUTO module connections
3.1 PIN-OUT
Ball Signal I/O Function Internal PULL UP Type
Audio
F9 AXE I Handsfree switching 100K CMOS 2.8V
G8 MIC_HF+ AI Handsfree mic. input; phase +, nom. level
3mVrms Audio
G9 MIC_MT- AI Handset mic.signal input; phase-, nom. level
50mVrms Audio
G10 EAR_MT+ AO Handset earphone signal output, phase + Audio
J8 MIC_MT+ AI Handset mic.signal input; phase+, nom. level
50mVrms Audio
J9 MIC_HF- AI Handsfree mic.input; phase -, nom. level
3mVrms Audio
J10 EAR_HF- AO Handsfree ear output, phase - Audio
H9 EAR_MT- AO Handset earphone signal output, phase - Audio
H10 EAR_HF+ AO Handsfree ear output, phase + Audio
SIM card interface
C10 SIMCLK O External SIM signal – Clock 1,8 / 3V
C11 SIMIN I External SIM signal - Presence (active low) 47K 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 O External SIM signal – Reset 1,8 / 3V
Trace
D11 TX_TRACE O TX Data for debug monitor CMOS 2.8V
F10 RX_TRACE I RX Data for debug monitor CMOS 2.8V
Prog. / Data + HW Flow Control
B6 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V
B7 C108/DTR I Input for Data terminal ready signal (DTR) from
DTE CMOS 2.8V
D9 C109/DCD O Output for Data carrier detect signal (DCD) to
DTE CMOS 2.8V
E7 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V
E11 C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V
F7 C105/RTS I Input for Request to send signal (RTS) from
DTE CMOS 2.8V
F6 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V
H8 C104/RXD O Serial data output to DTE CMOS 2.8V
IIC
D2 IIC_SDA_HW I/O IIC HW interface /Configurable GPIO CMOS 2.8V
E1 IIC_SCL_HW I/O IIC HW interface /Configurable GPIO CMOS 2.8V

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Ball Signal I/O Function Internal PULL UP Type
DAC and ADC
J11 ADC_IN1 AI Analog/Digital converter input A/D
H11 ADC_IN2 AI Analog/Digital converter input A/D
G11 ADC_IN3 AI Analog/Digital converter input A/D
Miscellaneous Functions
A2 RESET* I Reset input
D8 STAT_LED O Status indicator led CMOS 1.8V
E2 VRTC AO VRTC Power
F3 32K_IN I 32.768 KHz Square Wave Input CMOS 1.8V
J5 ON_OFF* I
Input command for switching power ON or OFF
(toggle command). The pulse to be sent to the
GE864 must be equal or greater than 1
second.
47K Pull up to VBATT
L8 PWRMON O Power ON Monitor CMOS 2.8V
L4 Antenna O Antenna output – 50 ohm RF
Telit GPIO
E6 TGPIO_01 / JDR I/O Telit GPIO01 I/O pin / Jammer detect report CMOS 2.8V
H5 TGPIO_02/PCM_WAO I/O Telit GPIO02 Configurable GPIO / PCM audio * CMOS 2.8V
K7 TGPIO_03 / PCM_RX I/O Telit GPIO03 Configurable GPIO / PCM audio * CMOS 2.8V
B3 TGPIO_04 I/O Telit GPIO04 Configurable GPIO / RF
Transmission Control CMOS 2.8V
K8 TGPIO_05 / RFTXMON I/O Telit GPIO05 Configurable GPIO / Transmitter
ON monitor CMOS 2.8V
B5 TGPIO_06 / ALARM I/O Telit GPIO06 Configurable GPIO / ALARM CMOS 2.8V
L9 TGPIO_07 / BUZZER I/O Telit GPIO07 Configurable GPIO / Buzzer CMOS 2.8V
H3 TGPIO_08 / PCM_TX I/O Telit GPIO08 Configurable GPIO / PCM audio * CMOS 2.8V
D7 PCM_CLK I/O Configurable GPIO / PCM audio * 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
F1 GND - Ground Power
H1 GND - Ground Power
L1 GND - Ground Power
H2 GND - Ground Power
L2 GND - Ground Power
J3 GND - Ground Power
K3 GND - Ground Power
L3 GND - Ground Power
K4 GND - Ground Power
K5 GND - Ground Power
D6 GND - Ground Power
K6 GND - Ground Power
L6 GND - Ground Power

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Ball Signal I/O Function Internal PULL UP Type
A11 GND - Ground Power
F11 GND - Ground Power
L11 GND - Ground Power
RESERVED
A3
A4
A5
A6
A7
A8
A9
A10
B1
B2
B4
B8
B9
B10
B11
C1
C2
C3
C4
C5
C6
C7
C8
C9
D1
D3
D5
E3
E4
E5
E8
E10
F2
F4
F5
F8
G1
G2
G3
G4

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Ball Signal I/O Function Internal PULL UP Type
G5
G6
G7
H4
H6
H7
J4
J6
J7
K9
K10
K11
L5
L7
L10
* 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 signal
J1,K1,J2,K2 VBATT
A1,F1,H1,L1,H2,L2,J3,K3,L3,
K4,K5,D6,K6,L6,A11,F11,L11
GND
J5 ON/OFF*
E7 TXD
A2 RESET*
H8 RXD

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3.1.1 BGA Balls Layout
TOP VIEW
A B C D E F G H J K L
1 GND - - - IIC_SCL_
HW GND - GND VBATT VBATT GND
2 RESET* - - IIC_SDA_
HW VRTC - - GND VBATT VBATT GND
3 - TGPIO_04 - - - 32K_IN -
TGPIO_08
/ PCM_TX GND GND GND
4 -- - - SIMVCC - - - - - GND Antenna
5 - TGPIO_06
/ ALARM - - -- -
TGPIO_02 /
PCM_WAO ON_OFF* GND -
6 - C125/RING - GND TGPIO_01
/ JDR
C106 /
CTS - - - GND GND
7 - C108 /
DTR - PCM_CLK C103 / TXD
C105 /
RTS - - - TGPIO_03/ PCM_RX -
8 - - -
STAD_
LED - - MIC_HF+ C104 / RXD MIC_MT+
TGPIO_05
/
RFTXMON
PWRMON
9 - - - C109 /
DCD SIMRST AXE MIC_MT- EAR_MT- MIC_HF- -
TGPIO_07
/ BUZZER
10 - - SIMCLK SIMIO - RX_TRACE EAR_MT+ EAR_HF+ EAR_HF- - -
11 GND - SIMIN TX_TRACE C107 /
DSR GND ADC_IN3 ADC_IN2 ADC_IN1 - GND

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AUDIO Signals balls
SIM CARD interface balls
TRACE Signals balls
Prog. / data + Hw Flow Control signals balls
IIC
DAC and ADC signals balls
MISCELLANEOUS functions signals balls
TELIT GPIO balls
POWER SUPPLY VBATT balls
POWER SUPPLY GND balls
RESERVED

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4 Hardware Commands
4.1 Turning ON the GE864-AUTO module
To turn on the GE864-AUTO 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:
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-AUTO 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.
ON*
Power ON impulse
GND
R1
R2
Q1

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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:
1s
10k
ON*
+
1.8V ... 5V
ON*

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4.2 Turning OFF the GE864-AUTO
The turning off of the device can be done in three ways:
•by software command (see GE864-AUTO 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-AUTO 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.
4.2.2 Hardware Unconditional Restart
To unconditionally Restart the GE864-AUTO, 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

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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-AUTO 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

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5 Power Supply
The power supply circuitry and board layout are a very important part in the full product design and
they strongly reflect on the product overall performances, hence read carefully the requirements and
the guidelines that will follow for a proper design.
5.1 Power Supply Requirements
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).

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The GE864-AUTO power consumptions are:
GE864-AUTO
Mode Average (mA) Mode description
IDLE mode Stand by mode; no call in progress
AT+CFUN=1 23,9 Normal mode: full functionality of the module
AT+CFUN=4 22 Disabled TX and RX; module is not registered on the
network
AT+CFUN=0 or
AT+CFUN=5 7,20 / 3,561
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 Receiving data mode
GSM TX and RX mode
Min power level 78,1
Max power level 200,1
GSM Sending data mode
GPRS (class 10) TX and RX mode
Min power level 123,7
Max power level 370,8
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.
1Worst/best case depends on network configuration and is not under module control

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5.2 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.
5.2.1 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
5.2.1.1 + 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-AUTO, 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-AUTO
from power polarity inversion.