Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 4 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
DISCLAIMER
The information contained in this document is proprietary information of Telit Communications S.p.A.
Telit Communications S.p.A. makes every effort to ensure the quality of the information it makes
available. Notwithstanding the foregoing, Telit Communications S.p.A. 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 Communications S.p.A. 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 Communications S.p.A. reserves the right to make modifications, additions and deletions to this
document at any time and without notice.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 5 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
1 Overview
The aim of this document is the description of some hardware solutions useful for developing a product with the
Telit GM862-QUAD / PY 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 GM862-QUAD / PY module.
For further hardware details that may not be explained in this document refer to the Telit GM862-QUAD / PY
Product Description document where all the hardware information is reported.
NOTICE
(EN) The integration of the GSM/GPRS GM862-QUAD / PY 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 GM862-QUAD / PY all’interno dell’applicazione
dell’utente dovrà rispettare le indicazioni progettuali descritte in questo manuale.
(DE) Die integration des GM862-QUAD / PY GSM/GPRS Mobilfunk-Moduls in ein Gerät muß gemäß der in
diesem Dokument beschriebenen Kunstruktionsregeln erfolgen
(SL) Integracija GSM/GPRS GM862-QUAD / PY modula v uporabniški aplikaciji bo morala upoštevati
projektna navodila, opisana v tem piročniku.
(SP) La utilización del modulo GSM/GPRS GM862-QUAD / PY 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 GM862-QUAD / PY dans l’application de l’utilisateur
sera faite selon les règles de conception décrites dans ce manuel.
GM862-QUAD / PY
The information presented in this document is believed to be accurate and reliable. However, no responsibility is
assumed by Telit Communication 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
Communication S.p.A. other than for circuitry embodied in Telit products. This document is subject to change
without notice.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 6 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
2 Interface connectors on GM862-QUAD
/ PY
2.1 Description
The Telit GM862-QUAD / PY is provided of the following interfaces:
• GSM antenna connector
• Board To Board Interface connector
• SIM Card Reader
The Telit GM862-QUAD / PY board to board connector is a CSTP 50 pin vertical SMD Molex 52991–0508
(male).
2.2 Connectors Position
SIM Card Holder
49
1
50
2
Board to Board
Connector
GSM Antenna
Connector
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 7 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
2.3 Board to Board Connector
Molex 52991-0508 (male) GM862 Connector LAY-OUT
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 8 of 70
6 A/D - A/D converter @ 11 bit (Input Impedance >100Kohm) Max 2V input
7 VBATT - Main power supply Power
8 CHARGE AI Battery Charger Input Power
9 EAR_HF+ AO Handsfree ear output, phase + Audio
10 EAR_MT- AO Handset earphone signal output, phase - Audio
11 EAR_HF- AO Handsfree ear output, phase - Audio
12 EAR_MT+ AO Handset earphone signal output, phase + Audio
13 MIC_HF- AI Handsfree microphone input; phase - Audio
14 MIC_MT+ AI Handset microphone signal input; phase+ Audio
15 MIC_HF+ AI Handsfree microphone input; phase + Audio
16 MIC_MT- AI Handset microphone signal input; phase- Audio
17 ON_OFF I Input command for switching power ON or OFF (toggle command).
18 AXE I Handsfree switching
19 SIMIO I/O External SIM signal - Data I/O 3V ONLY
20 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V
21 PWRMON O
22 SIMVCC - External SIM signal – Power (3) 3V ONLY
23 RESET I Reset input
24 SIMRST O External SIM signal – Reset 3V ONLY
25 CAM_CLK I/O Camera Interface (4) CMOS 2.8V
26 SIMCLK O External SIM signal – Clock 3V ONLY
27 SIMIN I/O External SIM signal – Presence (active low)
28 GPO2 / JDR O
29 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V
30 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V
31 GPI1 I General purpose input transistor base
GPIO8/CAM_O
32
N
Module Status ON indication (Signal output for power on/off control of external
devices
General purpose output (Open Collector) / Jammer Detect Report
I/O Configurable general purpose I/O pin / Camera Interface (4) CMOS 2.8V
Internal
Pull up
47KΩ
100KΩ
1KΩ
47KΩ
Open Collector
Pull Up to
VBATT
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
Type
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 9 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
Pin Signal I/O Function
33 C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V
GPIO9/CAM_RS
34
35 TX_TRACE O RESERVED on GM862-QUAD, Python Debug on GM862-QUAD-PY (TX data) CMOS 2.8V
36 C109/DCD O Output for Data carrier detect signal (DCD) to DTE CMOS 2.8V
37 C104/RXD O Serial data output to DTE CMOS 2.8V
38 GPIO10 I/O Configurable general purpose I/O CMOS 2.8V
39 STAT_LED O Status indicator led Open Collector
40 GPIO11 I/O Configurable general purpose I/O pin CMOS 2.8V
41 RX_TRACE I RESERVED on GM862-QUAD, Python Debug on GM862-QUAD-PY (RX data) CMOS 2.8V
42 GPIO12 I/O Configurable general purpose I/O pin CMOS 2.8V
43 C108/DTR I Input for Data terminal ready signal (DTR) from DTE (4) CMOS 2.8V
44 GPIO13 I/O Configurable general purpose I/O pin CMOS 2.8V
45 C105/RTS I Input for Request to send signal (RTS) from DTE CMOS 2.8V
46
47
48
49
50
T
GPIO3 / CAM_
SCL
GPIO4 /
CAM_SDA
GPIO5 /
RFTXMON
GPIO6
/ ALARM I/O
GPIO7
/ BUZZER I/O
I/O Configurable general purpose I/O pin / Camera Interface (4) CMOS 2.8V
Configurable general purpose I/O pin /
I/O
IIC Camera Interface (4)
Configurable general purpose I/O pin /
I/O
IIC Camera Interface (4)
I/O Configurable general purpose I/O pin / Transmitter ON Monitor CMOS 2.8V
Configurable general purpose I/O pin /
ALARM
Configurable general purpose I/O pin /
BUZZER
Internal
Pull up
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
Type
(1) For the exclusive use of the Technical Support Service
(2) An earphone with a 150 ohm impedance can be directly connected to EAR+ and EAR–
(3) On this pin a maximum of 10nF bypass capacitor is allowed.
(4) When activating the Easy camera these pins will not be available for other use
Note: If not used, almost all pins should be left disconnected. The only exceptions are the following
pins:
pin signal
1,3,5,7
2,4,6,8
17
20
23
37
45
VBATT
GND
ON/OFF*
TXD
RESET*
RXD
RTS1
1
RTS should be connected to the GND (on the module side) if flow control is not used
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 10 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
2.3.2 Antenna Connector
The Telit GM862-QUAD / PY includes one 50 Ohm MMCX coaxial female RF connector. On the user
application side the following connector must be used:
a) Telegärtner MMCX angle plug
crimp - Order n. J01340A0121
NOTE: be very careful when connecting the Telit GM862 Family modules RF connector. The RF
connector can be damaged if not connected with the proper antenna RF connector. The minimum
number of insertion cycles are recommended.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 11 of 70
2.4 Dimensions
The Telit GM862-QUAD / PY module overall dimension are:
• Length: 43.9 mm
• Width: 43.9 mm
• Thickness: 6.9 mm
• Volume: ≅ 13 cm
The layout is shown in the following figure:
3
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 12 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
2.5 Mounting the GM862 Modules on your Board
In order to electrically connect your board to the Telit GM862 Family modules, use a CSTP 2x25 pin
vertical SMD SCH–SCH Molex 53748 - 0504 (female, low profile) as a counterpart to the CSTP 50
pin vertical SMD Molex 52991–0508 (male) of your Telit GM862 Family modules.
When mounting the Telit GM862 Family modules on your board, take care of soldering the GM862
shielding reeds on a ground plane or signal.
NOTE: be very careful when connecting the Telit GM862 module RF connector. The Telit GM862
module RF connector can be damaged if not connected with the proper antenna RF connector. The
minimum number of insertion cycles is recommended.
2.5.1 Antenna Coaxial Cable Fixing
The following constraints must be respected in the Telit GM862 Family modules antenna cable
connection:
• The fixing point of the coaxial cable must not be placed too close to the antenna connector of the
GM862 module, leaving at least 30mm of flexible cable between the fixed point and the plug end.
• The fixing point must be at the same height of the GM862 module antenna connector, eventually
using a wedge between the PCB and the cable if it is directly fixed to the PCB.
• The flexible cable must never be bent with a radius lower than 25mm (RG174 cable).
• The cable must be a RG174 type or more flexible ones.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 13 of 70
The following pictures explain these constraints:
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
- Angle connector fixing example -
- Angle connector fixing example 2 -
NOTE: in the examples the cable is always bent, this is not a constrain. If the installation does not
require it, then the cable can be kept straight, ensuring that the fixing is without sliding.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 14 of 70
2.5.2 Precautions
• The plug should be inserted in the connector only after the installation of the Telit GM862
Family modules in the board. This is to prevent accidental breaking of the antenna
connection during the transport.
• The coaxial cable must be fixed at least in one point, without sliding possibilities.
• The plug insertion/removal must be done axially with the female connector of the GM862,
keeping lateral strains to a minimum.
• The insertion/crimping pull out force must be less than 15N.
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 15 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
3 Hardware Commands
3.1 Turning ON the GM862-QUAD / PY
To turn on the GM862-QUAD / PY the pin ON# must be tied low for at least 1 second and then
released.
The maximum current that can be drained from the ON# pin 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 GM862-QUAD / PY 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 labelled with a name that
ends with a "#" or with a bar over the name.
TIP: To check if power has raised it is possible to monitor the PWRMON line, when this line goes high the module is
powered on, but before it remains on the device needs other 900 ms for software startup. Hence check the
PWRMON line and 900 ms after its transition to high it is possible to release the ON# pin.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 16 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
For example:
1- Let's assume you need to drive the ON# pin with a totem pole output of a +3/5 V microcontroller
(uP_OUT1):
2- Let's assume you need to drive the ON# pin directly with an ON/OFF button:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 17 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
3.2 Turning OFF the GM862-QUAD / PY
The turning off of the device can be done in two ways:
• by software command (see GM862-QUAD / PY Software User Guide)
• by hardware shutdown
• by hardware unconditional shutdown
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.
The hardware unconditional shutdown does not issue this request and shuts down immediately the
device.
3.2.1 Hardware Shutdown
To turn OFF the GM862-QUAD / PY the pin ON# must be tied low for at least 1 second 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# pin.
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.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 18 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
3.2.2 Hardware Unconditional Restart
To unconditionally Shutdown the GM862-QUAD / PY the pin RESET# must be tied low for at least 200
milliseconds and then released.
The maximum current that can be drained from the RESET# pin is 0,15 mA.
A simple circuit to do it is:
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 GM862-QUAD / PY power regulator and improper functioning of the module.
The line RESET# must be connected only in open collector configuration.
TIP: The unconditional hardware Restart should be always implemented on the boards and software should use it
as an emergency exit procedure.
Unconditional Restart
impulse
RESET#
GND
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 19 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
For example:
1- Let's assume you need to drive the RESET# pin with a totem pole output of a +3/5 V microcontroller
(uP_OUT2):
The hardware unconditional restart must not be used during normal operation of the device
does not detach the device from the network. It shall be kept as an emergency exit procedure to be
done in the rare case that the device gets stacked waiting for some network or SIM responses.
If device does not respond to a command in the timeout window, retry issuing the command and if still
no response is received a hardware reset shall be issued.
* this signal is internally pulled up so the pin can be left floating if not used.
Unconditional Restart
impulse
since it
Reset Signal Operating levels:
Signal Min Max
RESET Input high 2.0V* 2.2V
RESET Input low 0V 0.2V
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 20 of 70
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
4 Power Supply
The power supply circuitry and board layout are the most 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.
4.1 Power Supply Requirements
The GM862-QUAD / PY power requirements are:
• Nominal Supply Voltage: 3.8 V
• Max Supply Voltage: 4.2 V
• Supply voltage range: 3.4 V - 4.2 V
• Max Peak current consumption (impulsive): 1.9 A
• Max Average current consumption during GPRS transmission : 500 mA
• Max Average current consumption during VOICE/CSD transmission : 270 mA
• Average current during Power Saving: ≈ 4 mA
• Average current during idle (Power Saving disabled) ≈ 19 mA
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 2 A.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 21 of 70
Loading...
+ 49 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.