SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
NOTICE
While reasonable efforts have been made to assure the accuracy of this document, Telit
assumes no liability resulting from any inaccuracies or omissions in this document, or from
use of the information obtained herein. The information in this document has been carefully
checked and is believed to be reliable. However, no responsibility is assumed for
inaccuracies or omissions. Telit reserves the right to make changes to any products
described herein and reserves the right to revise this document and to make changes from
time to time in content hereof with no obligation to notify any person of revisions or changes.
Telit does not assume any liability arising out of the application or use of any product,
software, or circuit described herein; neither does it convey license under its patent rights
or the rights of others.
It is possible that this publication may contain references to, or information about Telit
products (machines and programs), programming, or services that are not announced in
your country. Such references or information must not be construed to mean that Telit
intends to announce such Telit products, programming, or services in your country.
COPYRIGHTS
This instruction manual and the Telit products described in this instruction manual may be,
include or describe copyrighted Telit material, such as computer programs stored in
semiconductor memories or other media. Laws in the Italy and other countries preserve for
Telit and its licensors certain exclusive rights for copyrighted material, including the
exclusive right to copy, reproduce in any form, distribute and make derivative works of the
copyrighted material. Accordingly, any copyrighted material of Telit and its licensors
contained herein or in the Telit products described in this instruction manual may not be
copied, reproduced, distributed, merged or modified in any manner without the express
written permission of Telit. Furthermore, the purchase of Telit products shall not be deemed
to grant either directly or by implication, estoppel, or otherwise, any license under the
copyrights, patents or patent applications of Telit, as arises by operation of law in the sale
of a product.
COMPUTER SOFTWARE COPYRIGHTS
The Telit and 3rd Party supplied Software (SW) products described in this instruction
manual may include copyrighted Telit and other 3rd Party supplied computer programs
stored in semiconductor memories or other media. Laws in the Italy and other countries
preserve for Telit and other 3rd Party supplied SW certain exclusive rights for copyrighted
computer programs, including the exclusive right to copy or reproduce in any form the
copyrighted computer program. Accordingly, any copyrighted Telit or other 3rd Party
supplied SW computer programs contained in the Telit products described in this instruction
manual may not be copied (reverse engineered) or reproduced in any manner without the
express written permission of Telit or the 3rd Party SW supplier. Furthermore, the purchase
of Telit products shall not be deemed to grant either directly or by implication, estoppel, or
otherwise, any license under the copyrights, patents or patent applications of Telit or other
3rd Party supplied SW, except for the normal non-exclusive, royalty free license to use that
arises by operation of law in the sale of a product.
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GL865-QUAD V4 Hardware User Guide
USAGE AND DISCLOSURE RESTRICTIONS
I. License Agreements
The software described in this document is the property of Telit and its licensors. It is
furnished by express license agreement only and may be used only in accordance with the
terms of such an agreement.
II. Copyrighted Materials
Software and documentation are copyrighted materials. Making unauthorized copies is
prohibited by law. No part of the software or documentation may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, without prior written permission of Telit
III. High Risk Materials
Components, units, or third-party products used in the product described herein are NOT
fault-tolerant and are NOT designed, manufactured, or intended for use as on-line control
equipment in the following hazardous environments requiring fail-safe controls: the
operation of Nuclear Facilities, Aircraft Navigation or Aircraft Communication Systems, Air
Traffic Control, Life Support, or Weapons Systems (High Risk Activities"). Telit and its
supplier(s) specifically disclaim any expressed or implied warranty of fitness for such High
Risk Activities.
IV. Trademarks
TELIT and the Stylized T Logo are registered in Trademark Office. All other product or
service names are the property of their respective owners.
V. Third Party Rights
The software may include Third Party Right software. In this case you agree to comply with
all terms and conditions imposed on you in respect of such separate software. In addition
to Third Party Terms, the disclaimer of warranty and limitation of liability provisions in this
License shall apply to the Third Party Right software.
TELIT HEREBY DISCLAIMS ANY AND ALL WARRANTIES EXPRESS OR IMPLIED
FROM ANY THIRD PARTIES REGARDING ANY SEPARATE FILES, ANY THIRD PARTY
MATERIALS INCLUDED IN THE SOFTWARE, ANY THIRD PARTY MATERIALS FROM
WHICH THE SOFTWARE IS DERIVED (COLLECTIVELY “OTHER CODE”), AND THE
USE OF ANY OR ALL THE OTHER CODE IN CONNECTION WITH THE SOFTWARE,
INCLUDING (WITHOUT LIMITATION) ANY WARRANTIES OF SATISFACTORY
QUALITY OR FITNESS FOR A PARTICULAR PURPOSE.
NO THIRD PARTY LICENSORS OF OTHER CODE SHALL HAVE ANY LIABILITY FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED
AND WHETHER MADE UNDER CONTRACT, TORT OR OTHER LEGAL THEORY,
ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE OTHER CODE
OR THE EXERCISE OF ANY RIGHTS GRANTED UNDER EITHER OR BOTH THIS
LICENSE AND THE LEGAL TERMS APPLICABLE TO ANY SEPARATE FILES, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
11. DOCUMENT HISTORY ................................................................. 53
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1. INTRODUCTION
Scope
This document introduces the GL865-QUAD V4 module and presents possible and
recommended hardware solutions for developing a product based on this module. All the
features and solutions detailed in this document are applicable to all the variants listed in
the applicability table.
Obviously, this document cannot embrace every hardware solution or every product that
can be designed. Where the suggested hardware configurations need not be considered
mandatory, the information given should be used as a guide and a starting point for properly
developing your product with the Telit module.
Audience
This document is intended for Telit customers, who are integrators, about to implement their
applications using our GL865-QUAD V4 modules.
Contact Information, Support
For general contact, technical support services, technical questions and report
documentation errors contact Telit Technical Support at:
• TS-EMEA@telit.com
• TS-AMERICAS@telit.com
• TS-APAC@telit.com
• TS-SRD@telit.com
Alternatively, use:
http://www.telit.com/support
For detailed information about where you can buy the Telit modules or for recommendations
on accessories and components visit:
http://www.telit.com
Our aim is to make this guide as helpful as possible. Keep us informed of your comments
and suggestions for improvements.
Telit appreciates feedback from the users of our information.
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GL865-QUAD V4 Hardware User Guide
This information MUST be followed or catastrophic
Alerts the user to important points about
Provides advice and suggestions that may be
Text Conventions
Danger –
equipment failure or bodily injury may occur.
Caution or Warning –
integrating the module, if these points are not followed, the module and
end user equipment may fail or malfunction.
Tip or Information –
useful when integrating the module.
All dates are in ISO 8601 format, i.e. YYYY-MM-DD.
Related Documents
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2. GENERAL PRODUCT DESCRIPTION
Overview
The GL865-QUAD V4 module is a quad-band 850/900/1800/1900 MHz GSM / GPRS
communication product which allows integrators to plan on availability for even the longest
lifecycle applications, highly recommended for new designs specified for 2G coverage
worldwide.
The product is fully voice capable, the analog audio interface make it suitable for
applications such as voice enabled alarm panels, mHealth patient monitors and specialty
phones such as those for the elderly or sensory-impaired.
The GL865-QUAD V4 operates with 2.8 V GPIOs, minimizing power consumption and
making it even more ideally suited for battery powered and wearable device applications.
Product Variants and Frequency Bands
Product 2G Band (MHz) 3G Band (MHz)4G Band (MHz)Region
GL865-QUAD V4 850, 900,
1800, 1900
Refer to “RF Section” for details information about frequencies and bands.
- - -
Target Market
GL865-QUAD V4 can be used for telematics applications where tamper-resistance,
confidentiality, integrity, and authenticity of end-user information are required, for example:
• Emergency call
• Telematics services
• Road pricing
• Pay-as-you-drive insurance
• Stolen vehicles tracking
• Internet connectivity
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Main features
Function Features
Modem
Audio
Intefaces
TX Output Power
Band Power Class
850/900 MHz Class 4 (2W)
• 2G (GSM/GPRS) Quad Band
• SMS support (text and PDU)
• Alarm management
• Real Time Clock
• Analog audio
• Main UART is typically used for AT command access
• Secondary UARTused for Diagnostic monitoring and
debugging
• 8 GPIOs
• Antenna port
1800/1900 MHz Class 1 (1W)
RX Sensitivity
1800 MHz -110
1900 MHz -108
Band Sensitivity (dBm)
850 MHz -110
900 MHz -110
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Mechanical Specifications
2.7.1. Dimensions
The overall dimensions of GL865-QUAD V4 are:
• Length: 24.4 mm
• Width: 24.4 mm
• Thickness: 2.6 mm
2.7.2. Weight
The nominal weight of the module is 2.6 grams.
Temperature Range
Note
The module is fully
Operating Temperature
Range
–40°C ÷ +85°C
functional(*) in all the
temperature range, and it
fully meets the 3GPP
specifications.
Storage and non-operating
Temperature Range
–40°C ÷ +85°C
(*) Functional: the module is able to make and receive voice calls, data calls, SMS
and make data traffic.
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accordingly and
3. PINS ALLOCATION
Warning: GL865-QUAD V4 is adopting a modified 56-pin xL865 Form
Factor, pin to pin compatible with the previous 48-pin xL865 FF and
with 8 additional pads.
The numbering of the pins has been changed
attention has to be paid when comparing with previous 48-pin xL865
FF design.
Pin-out
Pin Signal I/O Function Type Comment
Audio
24 EAR- O Earphone signal (-) Audio
25 EAR+O Earphone signal (+) Audio
26 MIC- I Microphone signal (-) Audio
28 MIC+I Microphone signal (+) Audio
23 GND- -
SIM card interface
11 SIMVCC-
External SIM signal - Power
1.8 / 3V
supply for the SIM
12 SIMRSTO External SIM signal - Reset 1.8 / 3V
13 SIMCLKO External SIM signal – Clock 1.8 / 3V
14 SIMIOI/O External SIM signal - Data I/O 1.8 / 3V
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Asynchronous Auxiliary Serial Port
53 TX_AUXO
52 RX_AUXI
Prog. / Data + HW Flow Control
1 C109/DCD O
2 C125/RING O
3 C107/DSR O
4 C108/DTR I
Auxiliary UART
(TX Data to DTE)
Auxiliary UART
(RX Data from DTE)
Output for Data carrier detect
signal (DCD) to DTE
Output for Ring indicator signal
(RI) to DTE
Output for Data set ready
signal (DSR) to DTE
Input for Data terminal ready
signal (DTR) from DTE
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
5 C105/RTS I
Input for Request to send
CMOS 2.8V
signal (RTS) from DTE
6 C106/CTS O
Output for Clear to send signal
CMOS 2.8V
(CTS) to DTE
9 C103/TXD I Serial data input from DTE CMOS 2.8V
10 C104/RXDO Serial data output to DTE CMOS 2.8V
DIGITAL IO
48 GPIO_01I/O GPIO_01
CMOS
2.8V
47 GPIO_02 I/O GPIO_02
CMOS
2.8V
46 GPIO_03 I/O GPIO_03
CMOS
2.8V
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Power ON Monitor
45 GPIO_04 I/O GPIO_04
CMOS
2.8V
33 GPIO_05 I/O GPIO_05
CMOS
2.8V
32 GPIO_06 I/O GPIO_06
CMOS
2.8V
31 GPIO_07 I/O GPIO_07
CMOS
2.8V
30 GPIO_08 I/O GPIO_08
CMOS
2.8V
ADC
15 ADC_IN1AI Analog / Digital converter input A/D
16 ADC_IN2AI Analog / Digital converter input A/D
DAC
17 DAC_OUTAO Digital/Analog converter output D/A
RF SECTION
40 ANTENNAI/O Main Antenna (50 ohm) RF
Miscellaneous Functions
34 VRTCAO VRTC Backup 2.8V
55 RESET* I Reset Input 1.8V
51 VAUXO
Supply Output for
2.8V
external accessories /
Power Supply
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44 VBATT- Main power supply (Baseband) Power
43 VBATT_PA- Main power supply (Radio PA) Power
27 GND- Ground Power
21 GND- Ground Power
38 GND- Ground Power
39 GND- Ground Power
41 GND- Ground Power
42 GND- Ground Power
54 GND- Ground Power
RESERVED
7 RESERVED - RESERVED
8 RESERVED - RESERVED
18 RESERVED- RESERVED
19 RESERVED- RESERVED
20 RESERVED- RESERVED
22 RESERVED- RESERVED
29 RESERVED- RESERVED
35 RESERVED- RESERVED
36 RESERVED- RESERVED
37 RESERVED- RESERVED
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49 RESERVED- RESERVED
50 RESERVED- RESERVED
56 RESERVED- RESERVED
WARNING:
Reserved pins must not be connected.
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VQFN Pads Layout
TOP VIEW
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be taken when designing the application’s power supply section to
avoid having an excessive voltage drop. If the voltage drop is
4. 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.
Power Supply Requirements
The external power supply must be connected to VBATT & VBATT_PA signals and must
fulfil the following requirements:
Power Supply Value
Nominal Supply Voltage 3.8V
Normal Operating Voltage Range 3.40 V÷ 4.20 V
NOTE:
The Operating Voltage Range MUST never be exceeded; care must
exceeding the limits it could cause a Power Off of the module.
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Power Consumption
The values reported in the following table have been measured in nominal conditions
(3.8V@25°C) with 5% max error:
Mode Band Average (mA) Mode Description
IDLE mode
AT+CFUN=1 All13 (DRX9)
Power Saving Disabled
(+ESLP=0)
AT+ESLP=1 All 1 (DRX9)Power Saving Enabled
See AT Commands Guide
Operative Mode
GSM900 220 PCL5
GSM Voice Call
DCS1800 145 PCL0
GSM900 360
GPRS Data Call
PS Class 10 @ Gamma3
DCS1800 210
The GSM system is made in a way that the RF transmission is not continuous, but it is
packed into bursts at a base frequency of approx. 217 Hz, and the relative current peaks
can be as high as about 2A. Therefore the power supply has to be designed to withstand
these current peaks without big voltage drops; this means that both the electrical design
and the board layout must be designed for this current flow.
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 approx. 217 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.
NOTE:
The electrical design for the Power supply should be made ensuring it
will be capable of a peak current output of at least 2A (3.80V supply).
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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
4.3.1. 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
4.3.1.1. +5V 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 Module, a 100μF capacitor is usually
suited.
•Make sure the low ESR capacitor on the power supply output rated at least 10V.
An example of linear regulator with 5V input is:
delines
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4.3.1.2. +12V 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.
•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 capacitor is usually suited.
• Make sure the low ESR capacitor on the power supply output 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.
An example of switching regulator with 12V input is in the below schematic:
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GL865-QUAD V4 Hardware User Guide
MH, and Pb battery types directly
Ion battery
4.3.1.3. 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 GL865-QUAD V4 module.
•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
GL865-QUAD V4 from power polarity inversion. Otherwise the battery connector
should be done in a way to avoid polarity inversions when connecting the battery.
•The battery must be rated to supply peaks of current up to 2A.
NOTE:
DON'T USE any Ni-Cd, Niconnected with GL865-QUAD V4. Their use can lead to overvoltage
on the GL865-QUAD V4 and damage it. USE ONLY Litypes.
4.3.2. Thermal Design Guidelines
Worst case as reference values for thermal design of GL865-QUAD V4 are:
• Average current consumption: 500 mA
• Supply voltage: 3.80V
NOTE:
Make PCB design in order to have the best connection of GND pads
to large surfaces.
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4.3.3. 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 on the input to protect the supply from spikes The
placement of this component is crucial for the correct working of the circuitry. A misplaced
component can be useless or can even decrease the power supply performance.
•The Bypass low ESR capacitor must be placed close to the Telit GL865-QUAD V4
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 GL865-QUAD V4 is wide enough to ensure a dropless connection even during
an 2A current peak.
•The protection diode must be placed close to the input connector where the power
source is drained.
•The PCB traces to the GL865-QUAD V4 and the Bypass capacitor must be wide
enough to ensure no significant voltage drops occur. This is for the same reason as
previous point. Try to keep this trace as short as possible.
•To reduce the EMI due to switching, it is important to keep very small the mesh
involved; thus the input capacitor, the output diode (if not embodied in the IC) and
the regulator have to form a very small loop.This is done in order to reduce the
radiated field (noise) at the switching frequency (100-500 kHz usually).
•A dedicated ground for the Switching regulator separated by the 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.
•The insertion of EMI filter on VBATT pins is suggested in those designs where
antenna is placed close to battery or supply lines. A ferrite bead like Murata
BLM18EG101TN1 or Taiyo Yuden P/N FBMH1608HM101 can be used for this
purpose.
The below figure shows the recommended circuit:
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RTC
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 battery can be added in order to increase the RTC
autonomy during power off of the main battery (power supply). NO Devices must be
powered from this pin.
For additional details on the Backup solutions please refer to the related application note
(xL865 RTC Backup Application Note).
VAUX Power Output
A regulated power supply output is provided in order to supply small devices from the
module. The signal is present on pin 51 and it is in common with the PWRMON (module
powered ON indication) function.
This output is always active when the module is powered ON.
The operating range characteristics of the supply are:
Item Min Typical Max
Output voltage 2.7V2.8V2.9V
Output current - - 10mA
Output bypass capacitor
1uF
(inside the module)
NOTE:
The Output Current MUST never be exceeded; care must be taken
when designing the application section to avoid having an excessive
current consumption.
If the Current is exceeding the limits it could cause a Power Off of the
module.
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tput current is shared with the other GPIOs for a
increases the modem
NOTE:
VAUX max ou
maximum load of 10mA.
WARNING:
The current consumption from VAUX
temperature if the max output current is exceeded.
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5. DIGITAL SECTION
Logic Levels
ABSOLUTE MAXIMUM RATINGS:
Parameter Min Max
Input level on any digital pin (CMOS 2.8)
with respect to ground
OPERATING RANGE - INTERFACE VOLTAGE LEVELS (2.8V CMOS):
Parameter Min Max
Input high level 2.1V 3.1V
Input low level 0V 0.7V
Output high level 2.4V 3.1V
Output low level 0V 0.4V
CURRENT CHARACTERISTICS:
-0.3V +3.1V
Parameter AVG
Output Current 1mA
Input Current 1uA
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“Modem ON Proc”
PWR
supply=ON?
PWRMON=ON
?
Enter AT<CR>
PWRMON=ON
?
Delay = 1 sec
END
AT answer in
1second ?
Auto-Turning ON
To Auto-turn on the GL865-QUAD V4, the power supply must be applied on the power pins
VBATT and VBATT_PA, after 250 m-seconds, the VAUX pin will be at the high logic
level and the module can be consider fully operating.
A flow chart (draft) showing the proper turn on procedure is displayed below:
START
Delay = 1 sec
“Modem ON Proc”
Delay 1s -5s for Low
Voltage Operation
GO TO
“Modem Reset Proc”
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GO TO
“Start AT CMD”
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GL865-QUAD V4 Hardware User Guide
or during an
Delay = 300 msec
Enter AT <CR>
AT answer in
1 sec ?
A flow chart (draft) showing the AT commands managing procedure is displayed below:
“Start AT CMD”
START
Disconnect Power Supply
“Start AT CMD”
END
GO TO
“Modem ON Proc.”
NOTE:
In order to avoid a back powering effect it is recommended to avoid
having any HIGH logic level signal applied to the digital pins of the
GL865-QUAD V4 when the module is powered off
ON/OFF transition.
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or during an
Power Off
Turning off of the device can be done with General turn OFF.
General turn OFF – disconnect the power supply from the both power pins VBATT
and VBATT_PA at the same time. In this case all parts of the module are in OFF
condition, any power consumption is present. Before this action, the AT+EPOF command
must be send to the module with a time out up to 10 seconds in order to correctly de-attach
from the network and internal filesystem properly closed.
NOTE:
In order to avoid a back powering effect it is recommended to avoid
having any HIGH logic level signal applied to the digital pins of the
GL865-QUAD V4 when the module is powered off
ON/OFF transition.
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Reset
RESET* is used to restart the GL865-QUAD V4. Whenever this signal is pulled low, the
GL865-QUAD V4 is reset. When the device is reset it stops any operation. After the release
of the line, the GL865-QUAD V4 is restarted, without doing any detach operation from the
network where it is registered.
To restart the GL865-QUAD V4, the pad RESET* must be tied low for at least 200
milliseconds and then released.
The signal is internally pulled up so the pin can be left floating if not used.
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.
PINS DESCRIPTION
Signal Function I/O PAD
RESET* Restart of the Module I 55
WARNING:
The hardware restart must not be used during normal operation of the
device since it does not detach the device from the network. It shall be
kept as an emergency exit procedure.
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when the module is powered off or during an
A typical circuit is the following:
For example:
Let us assume you need to drive the RESET* pad with a totem pole output of a +3/5 V
microcontroller:
NOTE:
In order to avoid a back powering effect it is recommended to avoid
having any HIGH logic level signal applied to the digital pins of the
GL865-QUAD V4
ON/OFF transition.
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To proper power on again the module please refer to the related
NOTE:
Do not use any pull up resistor on the RESET* line nor any totem pole
digital output. Using pull up resistor may bring to latch up problems on
the GL865-QUAD V4 power regulator and improper functioning of the
module.
paragraph (“Power ON”)
The restart must always be implemented on the boards and should be
used only as an emergency exit procedure.
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Communication ports
5.5.1. Serial Ports
The GL865-QUAD V4 module is provided with by 2 Asynchronous serial ports:
• MODEM SERIAL PORT 1 (Main)
• MODEM SERIAL PORT 2 (Auxiliary)
Several configurations can be designed for the serial port on the OEM hardware, but the
most common are:
• 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. On the GL865-QUAD V4 the ports are CMOS 2.8.
5.5.1.1. Modem serial port 1 (USIF0)
The serial port 1 on the GL865-QUAD V4 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 following table is listing the available signals:
RS232
Signal Pad Name Usage
Pin
1 C109/DCD 1
Data Carrier
Detect
2 C104/RXD 10
Transmit line
*see Note
3 C103/TXD 9
Receive line
*see Note
4 C108/DTR 4
Data Terminal
Ready
5 GND
21, 38,
Ground Ground
39, 41,
42, 54
Output from the GL865-QUAD V4
that indicates the carrier presence
Output transmit line of GL865QUAD V4 UART
Input receive of the
GL865-QUAD V4 UART
Input to the GL865-QUAD V4 that
controls the DTE READY condition
6 C107/DSR 3 Data Set Ready
Output from the GL865-QUAD V4
that indicates the module is ready
7 C106/CTS 6 Clear to Send
Output from the GL865-QUAD V4
that controls the Hardware flow
control
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For a minimum implementation, only the TXD, RXD lines can be
having any HIGH logic level signal applied to the digital pins of the
when the module is powered off or during an
8 C105/RTS 5
Request to
Send
9 C125/RING 2 Ring Indicator
NOTE:
According to V.24, some signal names are referred to the application
side, therefore on the GL865-QUAD V4 side these signal are on the
opposite direction:
TXD on the application side will be connected to the receive line (here
named C103/TXD)
RXD on the application side will be connected to the transmit line (here
named C104/RXD)
connected, the other lines can be left open provided a software flow
control is implemented.
Input to the GL865-QUAD V4 that
controls the Hardware flow control
Output from the GL865-QUAD V4
that indicates the incoming
call condition
In order to avoid a back powering effect it is recommended to avoid
GL865-QUAD V4
ON/OFF transition.
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GL865-QUAD V4 Hardware User Guide
when the module is powered off or during an
5.5.1.2. Modem serial port 2 (USIF1)
The secondary serial port on the GL865-QUAD V4 is a CMOS 2.8V with only the RX and
TX signals.
The signals of the GL865-QUAD V4 serial port are:
PAD Signal I/O Function Type NOTE
53 TX_AUXO
52 RX_AUXI
NOTE:
Serial port 2 is currently used only for debug purposes.
NOTE:
In order to avoid a back powering effect it is recommended to avoid
having any HIGH logic level signal applied to the digital pins of the
GL865-QUAD V4
ON/OFF transition.
Auxiliary UART
(TX Data to DTE)
Auxiliary UART
(RX Data from DTE)
CMOS 2.8V
CMOS 2.8V
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General purpose I/O
The GL865-QUAD V4 module is provided by a set of Configurable Digital Input / Output
pins (CMOS 2.8V). Input pads can only be read; they 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 GL865-QUAD V4 firmware and acts
depending on the function implemented.
The following table shows the available GPIO on the GL865-QUAD V4:
PAD Signal I/O
Drive
Strength
Default
State
48 GPIO_01I/O1 mAINPUT
47 GPIO_02I/O1 mAINPUT
46 GPIO_03 I/O 1 mA INPUT
45 GPIO_04 I/O 1 mA INPUT
33 GPIO_05 I/O 1 mA INPUT
32 GPIO_06 I/O 1 mA INPUT
31 GPIO_07 I/O 1 mA INPUT
30 GPIO_08 I/O 1 mA INPUT
NOTE
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when the module is powered off or during an
5.6.1. Using a GPIO 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.
NOTE:
In order to avoid a back powering effect it is recommended to avoid
having any HIGH logic level signal applied to the digital pins of the
GL865-QUAD V4
ON/OFF transition.
5.6.2. Using a GPIO 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.
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External SIM Holder
Please refer to 0 the related User Guide (SIM Holder Design Guides, 80000NT10001a).
ADC Converter
The GL865-QUAD V4 is provided by two AD converter. It is able to read a voltage level in
the range of 0÷2.8 volts applied on the ADC pin input, store and convert it into 10 bit word.
The input lines are named as ADC_IN1 (available on Pad 15) and ADC_IN2 (available on
Pad 16).
The following table is showing the ADC characteristics:
Item Min
Input Voltage range 0 - 2.8 Volt
AD conversion - - 10 bits
5.8.1. Using ADC Converter
The ADC could be controlled using an AT command.
The command is AT#ADC=1,2 to read ADC_IN1 and AT#ADC=2,2 to read ADC_IN2.
The read value is expressed in mV
Refer to SW User Guide or AT Commands Reference Guide for the full description of this
function.
Typical
Max Unit
DAC Converter
The GL865-QUAD V4 provides a Digital to Analog Converter. The signal (named
DAC_OUT) is available on pin 17 of the GL865-QUAD V4. The on board DAC is a 10 bit
converter, able to generate an analogue value based on a specific input in the range from
0 up to 1023. However, an external low-pass filter is necessary.
The following table is showing the ADC characteristics:
Item Min Max Unit
Voltage range (filtered) 0 2.8 Volt
Range 0 1023 Steps
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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.
5.9.1. Enabling DAC
An AT command is available to use the DAC function.
The command is: AT#DAC= [<enable> [, <value>]]
<value> - scale factor of the integrated output voltage (0..1023 – 10 bit precision)
it must be present if <enable>=1
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.
5.9.2. LOW Pass filter Example
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Input power
VSWR absolute max
VSWR recommended
6. RF SECTION
Bands Variants
The following table is listing the supported Bands:
Product Supported 2G bands
GL865-QUAD V4 GSM900, GSM850, DCS1800, PCS1900
TX Output power
Product Band Power Class
GL865-QUAD V4
GSM900, GSM850,
DCS1800, PCS1900
Class 4 (2W) @ 850/900
MHz, Class 1 (1W) @
800/1900 MHz
Antenna requirements
The antenna connection and board layout design are the most important aspect in the full
product design as they strongly affect the product overall performances, hence read
carefully and follow the requirements and the guidelines for a proper design.
The antenna and antenna transmission line on PCB for a Telit GL865-QUAD V4 device
shall fulfil the following requirements:
Item Value
Frequency range 824-894 MHz GSM850 band
880-960 MHz GSM900 band
1710-1885MHz DCS1800 band
1850-1990MHz PCS1900 band
Gain 2.95dBi @GSM900 and 8.84dBi @DCS1800
Impedance 50 ohm
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2.95dBi @GSM850 and 8.84dBi @PCS1900
> 2W
≤ 10:1 (limit to avoid permanent damage)
≤ 2:1 (limit to fulfill all regulatory requirements)
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GL865-QUAD V4 Hardware User Guide
6.3.1. PCB Design guidelines
When using the GL865-QUAD V4, since there's no antenna connector on the module, the
antenna must be connected to the GL865-QUAD V4 antenna pad by means of a
transmission line implemented on the PCB.
This transmission line shall fulfil the following requirements:
Item Value
Characteristic Impedance 50 ohm (+-10%)
Max Attenuation 0,3 dB
Coupling Coupling with other signals shall be avoided
Ground Plane
Cold End (Ground Plane) of antenna shall be
equipotential to the GL865-QUAD V4 ground pins
The transmission line should be designed according to the following guidelines:
• Make sure that the transmission line’s characteristic impedance is 50ohm ;
• Keep line on the PCB as short as possible, since the antenna line loss shall be less
than about 0,3 dB;
•Line geometry should have uniform characteristics, constant cross section, avoid
Coplanar Waveguide...) can be used for implementing the printed transmission line
afferent the antenna;
•If a Ground plane is required in line geometry, that plane has to be continuous and
sufficiently extended, so the geometry can be as similar as possible to the related
canonical model;
•Keep, if possible, at least one layer of the PCB used only for the Ground plane; If
possible, use this layer as reference Ground plane for the transmission line;
•It is wise to surround (on both sides) the PCB transmission line with Ground, avoid
having other signal tracks facing directly the antenna line track.
•Avoid crossing any un-shielded transmission line footprint with other signal tracks
on different layers;
•The ground surrounding the antenna line on PCB has to be strictly connected to the
main Ground Plane by means of via holes (once per 2mm at least), placed close to
the ground edges facing line track;
• Place EM noisy devices as far as possible from GL865-QUAD V4 antenna line;
• Keep the antenna line far away from the GL865-QUAD V4 power supply lines;
• If EM noisy devices (such as fast switching ICs, LCD and so on) are present on the
PCB hosting the LE910, take care of the shielding of the antenna line by burying it
in an inner layer of PCB and surround it with Ground planes, or shield it with a metal
frame cover.
•If EM noisy devices are not present around the line, the use of geometries like
Microstrip or Grounded Coplanar Waveguide has to be preferred, since they
typically ensure less attenuation if compared to a Stripline having same length;
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7. MECHANICAL DESIGN
Drawing
NOTE:
Dimensions in mm.
General Tolerance ±0.1, Angular Tolerance ±1°, The tolerance is not
cumulative.
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8. APPLICATION PCB DESIGN
The GL865-QUAD V4 modules have been designed in order to be compliant with a standard
lead-free SMT process.
Footprint
TOP VIEW
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In order to easily rework the GL865-QUAD V4 is suggested to consider on the application
a 1.5 mm placement inhibit area around the module.
It is also suggested, as common rule for an SMT component, to avoid having a mechanical
part of the application in direct contact with the module.
NOTE:
In the customer application, the region under WIRING INHIBIT (see
figure above) must be clear from signal or ground paths.
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PCB
Copper
SMD
NSMD
(Non Solder Mask Defined)
PCB pad design
Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB.
Solder Mask
(Solder Mask Defined)
PCB pad dimensions
The recommendation for the PCB pads dimensions are 1:1 with module pads.
It is not recommended to place via or micro-via not covered by solder resist in an area of
0,3 mm around the pads unless it carries the same signal of the pad itself
Holes in pad are allowed only for blind holes and not for through holes.
Recommendations for PCB pad surfaces:
Finish Layer Thickness (um) Properties
Electro-less Ni /
3 –7 / 0.03 – 0.15
Immersion Au
The PCB must be able to resist the higher temperatures which are occurring at the leadfree 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.
good solder ability protection,
high shear force values
It is not necessary to panel the application’s PCB, however in that case it is suggested to
use milled contours and predrilled board breakouts; scoring or v-cut solutions are not
recommended.
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Stencil
Stencil’s apertures layout can be the same of the recommended footprint (1:1), we suggest
a thickness of stencil foil ≥ 120 µm.
Solder paste
Item Lead Free
Solder Paste Sn/Ag/Cu
We recommend using only “no clean” solder paste in order to avoid the cleaning of the
modules after assembly.
Solder Reflow
Recommended solder reflow profile:
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All temperatures refer to topside of the package, measured on the
MODULE WITHSTANDS ONE REFLOW
Profile Feature Pb-Free Assembly
Average ramp-up rate (TL to TP) 3°C/second max
Preheat
– Temperature Min (Tsmin)
– Temperature Max (Tsmax)
– Time (min to max) (ts)
Tsmax to TL
150°C
200°C
60-180 seconds
3°C/second max
– Ramp-up Rate
Time maintained above:
– Temperature (TL)
– Time (tL)
217°C
60-150 seconds
Peak Temperature (Tp) 245 +0/-5°C
Time within 5°C of actual Peak
10-30 seconds
Temperature (tp)
Ramp-down Rate 6°C/second max.
Time 25°C to Peak Temperature 8 minutes max.
NOTE:
package body surface
WARNING:
THE GL865-QUAD V4
PROCESS ONLY.
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and does not guarantee adequate adherence of the module to the
range. Customer
WARNING:
The above solder reflow profile represents the typical SAC reflow limits
customer application throughout the temperature
must optimize the reflow profile depending on the overall system taking
into account such factors as thermal mass and warpage.
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9. SAFETY RECOMMENDATIONS
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 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.
The European Community provides some Directives for the electronic equipment
introduced on the market. All the relevant information’s are available on the European
Community website:
The text of the Directive 99/05 regarding telecommunication equipment is available, while
the applicable Directives (Low Voltage and EMC) are available at: