LE920 Hardware User Guide 1vv0301026 Rev.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- APPLICABILITY TABLE PRODUCT LE920-- EU LE920-- NA Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05SPECIFICATIONS 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 entirely reliable. However, no responsibility is assumed for inaccuracies or omissions.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Usage and Disclosure Restrictions 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. Copyrighted Materials Software and documentation are copyrighted materials. Making unauthorized copies is prohibited by law.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Contents 1. 2. Introduction ........................................................................................................... 9 1.1. Scope ............................................................................................................................ 9 1.2. Audience ....................................................................................................................... 9 1.3.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-054.3.2. Hardware Shutdown ...................................................................................................... 29 4.3.3. Hardware Unconditional Restart ................................................................................... 30 4.3.4. Hardware Unconditional Shutdown ............................................................................... 31 4.4. 5. Summary of Turning ON and OFF the module ................
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 10.1. 11. Digital Audio ........................................................................................................... 54 General Purpose I/O.......................................................................................... 56 11.1. Logic Level Specifications ...................................................................................... 57 11.2. Using a GPIO Pad as Input ......................................
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 15. Packing system ................................................................................................. 72 15.1. Tray Drawing........................................................................................................... 73 15.2. Moisture Sensibility ................................................................................................ 74 16. Safety Recommendations .....................................
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 1. 1.1. Introduction Scope The aim of this document is the description of some hardware solutions useful for developing a product with the Telit LE920-EU/NA module. All the features and solutions detailed are applicable to all LE920, whereas “LE920” is intended the modules listed in the applicability table. When a specific feature is applicable to a specific product, it will be clearly highlighted. 1.2.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 1.4. Document Organization This document contains the following chapters: Chapter 1: “Introduction” provides a scope for this document, target audience, contact and support information, and text conventions. Chapter 2: “General Product Description” gives an overview of the features of the product. Chapter 3: “LE920 Module Connections” deals with the pin out configuration and layout.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 1.5. Text Conventions Danger – This information MUST be followed or catastrophic equipment failure or bodily injury may occur. Caution or Warning – Alerts the user to important points about integrating the module, if these points are not followed, the module and end user equipment may fail or malfunction. Tip or Information – Provides advice and suggestions that may be useful when integrating the module. All dates are in ISO 8601 format, i.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 2. 2.1. General Product Description Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit LE920 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.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 2.2. LE920 Mechanical Dimensions The Telit LE920 module overall dimensions are: 2.3. Length: 34 mm Width: 40 mm Thickness: 2.9 mm Weight The module weight of LE920-EU/NA is about 9.0 gram. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 2.4. Environmental requirements 2.4.1. Temperature range Note Operating Temperature Range Storage and non-operating Temperature Range –20°C ~ +55°C The module is fully functional (*) in all the temperature range, and it fully meets the ETSI specifications. –40°C ~ +85°C The module is fully functional (*) in all the temperature range. Temperatures outside of the range –20°C ÷ +55°C might slightly deviate from ETSI specifications.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 2.5. Operating Frequency The operating frequencies in GSM850, EGSM900, DCS1800, PCS1900, WCDMA & LTE modes are conformed to the 3GPP specifications. Mode Freq. TX (MHz) Freq.
LE920 Hardware User Guide 1vv0301026 Rev.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 3. 3.1. LE920 Module Connections PIN-OUT PAD Signal I/O Function USB HS 2.0 Communication Port I/O USB differential Data(+) D19 USB_D+ USB_DI/O USB differential Data(+) F19 AI Power sense for the internal USB transceiver A18 USB_VBUS Asynchronous UART – Prog.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05PAD Signal C10 DVI_CLK Digital I/O GPIO_01 F9 E10 GPIO_02 GPIO_03 F11 E12 GPIO_04 GPIO_05 F13 E14 GPIO_06 R18 GPIO_07 GPIO_08 S19 U19 GPIO_09 W19 GPIO_10 RF Section AD1 Antenna AU9 ANT_DIV GPS Section ANT_GPS S1 Miscellaneous Function AP1 RESET# AS1 ON_OFF# AN12 SHDN_N I/O Function O Digital Voice interface (CLK master output) Type 1.8V I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O 1.8V 1.8V 1.8V 1.8V 1.8V 1.8V 1.8V 1.8V 1.8V 1.
LE920 Hardware User Guide 1vv0301026 Rev.
LE920 Hardware User Guide 1vv0301026 Rev.
LE920 Hardware User Guide 1vv0301026 Rev.
LE920 Hardware User Guide 1vv0301026 Rev.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05AU11,AU15 AS1 ON/OFF* Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 3.1.1. LGA Pads Layout NOTE: The pin defined as RES has to be considered RESERVED and not connected on any pin in the application. The related area on the application has to be kept empty. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 4. 4.1. Hardware Commands Turning ON the LE920 To turn on LE920, the pad ON# must be tied low for at least 1 second and then released. The maximum current that can be drained from the ON# pad is 0.1 mA. A simple circuit to power on the module is illustrated below: 4.2. Initialization and Activation state Upon turning on LE920 module, The LE920 is not activated yet because the boot sequence of LE920 is still going on internally.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05NOTE: To check if the LE920 has powered on, the hardware line PWRMON must be monitored. When PWRMON goes high, the module has powered on. NOTE: Do not 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 LE920 power regulator and improper power on/off of the module. The line ON# must be connected only in open collector configuration.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 4.3. Turning OFF the LE920 Turning off the device can be done in three ways: x by Software command x by Hardware shutdown x by Hardware Unconditional Restart x 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.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 4.3.1. Shutdown by Software Command LE920 can be shut down by a software command. When a shut down command is sent, LE920 goes into the finalization state and finally will shut down PWRMON at the end of this state. The period of the finalization state can differ according to the situation in which the LE920 is so it cannot be fixed definitely.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 4.3.2. Hardware Shutdown To turn OFF LE920 the pad ON/OFF# must be tied low for at least 2 seconds and then released. Same circuitry and timing for the power on must be used. When the hold time of ON/OFF# is above 2 seconds, LE920 goes into the finalization state and finally will shut down PWRMON at the end of this state.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 4.3.3. Hardware Unconditional Restart To unconditionally restart LE920, 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 NOTE: Do not use any pull up resistor on the RESET# line or any totem pole digital output. Using pull up resistor may bring to latch up problems on the LE920 power regulator and improper functioning of the module.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05For example: 1- Let us assume you need to drive the RESET# pad with a totem pole output of a +1.8/5 V microcontroller (uP_OUT2): SHDN_N Unconditional Shutdown impulse GND 4.3.4. Hardware Unconditional Shutdown To unconditionally Shutdown LE920, the pad SHDN_N must be tied low for at least 200 milliseconds and then released.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05NOTE: Do not use any pull up resistor on the SHDN_N line or any totem pole digital output. Using pull up resistor may bring to latch up problems on the LE920 power regulator and improper functioning of the module. The line SHDN_N must be connected only in open collector configuration.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 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. Read carefully the requirements and the guidelines that will follow for a proper design. 5.1.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05GSM900 PL5 DCS1800 PL0 255 240 EDGE Sending data mode * Worst/best case depends on network configuration and is not under module control. TIP: The electrical design for the Power supply must be made ensuring that it will be capable of a peak current output of at least 2A.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 5.2. General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps: 5.2.1. x the electrical design x the thermal design x the PCB layout Electrical Design Guidelines The electrical design of the power supply depends strongly on the power source where this power is drained. We will distinguish them into three categories: 5.2.1.1.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05An example of linear regulator with 5V input is: 5.2.1.2. + 12V Input Source Power Supply Design Guidelines x 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 must not be used. A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by LE920.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05An example of switching regulator with 12V input is in the below schematic (it is split in 2 parts): Switching regulator Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-055.2.1.3. Battery Source Power Supply Design Guidelines x The desired nominal output for the power supply is 3.8V and the maximum allowed voltage is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit LE920 module. The three cells Ni/Cd or Ni/MH 3.6 V Nom.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 5.2.2.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05The peak current consumption in the GSM mode is higher than that in WCDMA. However, considering the heat sink is more important in case of WCDMA. As mentioned before, a GSM signal is bursty, thus, the temperature drift is more insensible than WCDMA. Consequently, if you prescribe the heat dissipation in the WCDMA mode, you don’t need to think more about the GSM mode. 5.2.3.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05x The power supply input cables must be kept separately from noise sensitive lines such as microphone/earphone cables. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 6. Antenna(s) The antenna connection and board layout design are the most important parts in the full product design and they strongly reflect on the product’s overall performances. Read carefully and follow the requirements and the guidelines for a proper design. 6.1.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05Antenna Line on PCB Requirements Characteristic Impedance 50Ohm Max Attenuation 0.3dB Coupling with other signals shall be avoided Cold End (Ground Plane) of antenna shall be equipotential to the LE920 ground pads Furthermore if the device is developed for the US and/or Canada market, it must comply to the FCC and/or IC approval requirements: This device is to be used only for mobile and fixed application.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 6.3. 6.4. GSM/WCDMA/LTE Antenna – Installation Guidelines x Install the antenna in a place covered by the GSM/WCDMA signal.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05The second Rx antenna should not be located in the close vicinity of main antenna. In order to improve Diversity Gain, Isolation and reduce mutual interaction, the two antennas should be located at the maximum reciprocal distance possible, taking into consideration the available space into the application. 6.5. GPS/GNSS Antenna Requirements LE920 supports only passive antenna and includes an internal LNA inside (13.5dB gain typ.).
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 6.5.2. Linear and Patch GPS/GNSS Antenna Using this type of antenna introduces at least 3dB of loss if compared to a circularly polarized (CP) antenna. Having a spherical gain response instead of a hemispherical gain response could aggravate the multipath behaviour & create poor position accuracy. 6.5.3.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05x x x x x 6.5.5. having other signal tracks directly facing the antenna line track. The Ground around the antenna line on PCB has to be strictly connected to the main Ground plane by placing vias once per 2mm at least. Place EM noisy devices as far as possible from LE920 antenna line. Keep the antenna line far away from the LE920 power supply lines.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 7. Logic Level Specifications Where not specifically stated, all the interface circuits work at 1.8V CMOS logic levels. The following table shows the logic level specifications used in the Telit LE920 interface circuits: NOTE: Do not connect LE920’s digital logic signal directly to OEM’s digital logic signal of with level higher than 2.7V for 1.8V CMOS signals. For 1.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 8. USB Port The LE920 module includes a Universal Serial Bus (USB) transceiver, which operates at USB low-speed (1.5Mbits/sec), USB full-speed (12Mbits/sec) and USB high-speed (480Mbits/sec). It is compliant with the USB 2.0 specification and can be used for diagnostic monitoring, control and data transfers. The USB_DPLUS and USB_DMINUS signals have a clock rate of 480MHz. The signal traces should be routed carefully.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 9. Serial Ports The serial port on the Telit LE920 is the interface between the module and OEM hardware. Two serial ports are available on the module: x MODEM SERIAL PORT 1(Main) x MODEM SERIAL PORT 2 (Auxiliary) -TBD Several configurations can be designed for the serial port on the OEM hardware. The most common are: x RS232 PC com port; x Microcontroller UART @ 1.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 9.1. Modem Serial Port 1 Serial port 1 on the LE920 is a +1.8V UART with all 7 RS232 signals. It differs from the PC-RS232 in the signal polarity (RS232 is reversed) and levels.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 9.2. Modem Serial Port 2 Serial port 2 on the LE920 is a +1.8V UART with only the RX and TX signals. The signals of the LE920 serial port are: PAD Signal I/O Function Type AB19 TXD_AUX O Auxiliary UART (TX Data to DTE) 1.8V Auxiliary UART (RX Data to DTE) 1.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05An example of RS232 level adaption circuitry could be accomplished using a MAXIM transceiver (MAX218). In this case the chipset is capable of translating directly from 1.8V to the RS232 levels (Example on 4 signals only). 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.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 10. Audio Section Overview The LE920 module support digital audio interface. 10.1. Digital Audio LE920 module can be connected to external codec through digital interface.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 11.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 11.1. Logic Level Specifications Where not specifically stated, all the interface circuits work at 1.8V CMOS logic levels. The following table shows the logic level specifications used in the LE920 interface circuits: For 1,8V signals: Absolute Maximum Ratings -Not Functional LE920 Parameter Min Max Input level on any -0.3V +2.16 V digital pin when on Input voltage on -0.3V +2.16 V analog pins when on Operating Range - Interface levels (1.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 11.3. Using a GPIO Pad as Output The GPIO pads, when used as outputs, can drive 1.8V 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. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 11.4. 11.4.1. Using the Temperature Monitor Function Short Description The Temperature Monitor is a function of the module that permits to control its internal temperature and if properly set (see the #TEMPMON command on AT Interface guide) it raises to High Logic level a GPIO when the maximum temperature is reached. 11.5.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 11.6. 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. NOTE: NO devices must be powered from this pin. 11.7.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 12. ADC section 12.1. 12.1.1. ADC Converter Description The on board ADCs are 8-bit converters. They are able to read a voltage level in the range of 0-2 volts applied on the ADC pin input and store and convert it into 8 bit word. Input Voltage range AD conversion Resolution Min 0 - Max 1.7 8 < 6.6 Units Volt bits mV The LE920 module provides 3 Analog to Digital Converters. 12.1.2.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 13. Mounting the module on your board 13.1. General The LE920 modules have been designed in order to be compliant with a standard lead-free SMT process.Module 13.2. Finishing & Dimensions Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 13.3. Recommended foot print for the application 198 pads Top View In order to easily rework the LE920 it is suggested to consider on the application having a 1.5 mm placement inhibit area around the module. It is also suggested, as a common rule for an SMT component, to avoid having a mechanical part of the application in direct contact with the module.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 13.4. Stencil Stencil’s apertures layout can be the same as the recommended footprint (1:1). A suggested thickness of stencil foil is greater than 120 μm. 13.5. PCB Pad Design Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB. Copper pad PCB Solder mask Copper pad PCB Solder Mask Defined 13.6.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05It 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 (see following figure). Holes in pad are allowed only for blind holes and not for through holes. Recommendations for PCB Pad Surfaces: Finish Electro-less Ni / Immersion Au Layer thickness (um) 3 –7 / 0.05 – 0.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 13.7. Solder Paste Solder Paste Lead free Sn/Ag/Cu We recommend using only “no clean” solder paste in order to avoid the cleaning of the modules after assembly. 13.7.1. Solder Reflow Recommended solder reflow profile: Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 14. Application guide 14.1. Debug of the LE920 in production To test and debug the mounting of LE920, we strongly recommend to foresee test pads on the host PCB, in order to check the connection between the LE920 itself and the application and to test the performance of the module connecting it with an external computer.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 14.2. Bypass capacitor on Power supplies When a sudden voltage is asserted to or cut from the power supplies, the steep transition makes some reactions such as the overshoot and undershoot. This abrupt voltage transition can affect the device not to work or make it malfunction. The bypass capacitors are needed to alleviate this behavior and it can be affected differently according to the various applications.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 14.4. EMC recommendations (TBD) LE920 signals are provided by some EMC protections. In any case the accepted levels are different on the pins.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 14.5. Download and Debug Port One of the following options should be chosen in the design of host system in order to download or upgrade the Telit’s software and debug LE920 when LE920 is already mounted on a host system. Users who use both of UART and USB interfaces to communicate LE920 - Must implement a download method in a host system for upgrading LE920 when it’s mounted.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 15. Packing system The Telit LE920 is packaged on trays. Each tray contains 20 pieces as shown in the following picture: Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 15.1. Tray Drawing Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05WARNIG: These trays can withstand a maximum temperature of 65͠. 15.2. Moisture Sensibility The LE920 is a Moisture Sensitive Device level 3, in accordance with standard IPC/JEDEC JSTD-020. Observe all of the requirements for using this kind of components. Calculated shelf life in sealed bag: 4 months at <40°C and <90% relative humidity (RH). Reproduction forbidden without written authorization from Telit Communications S.p.A.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 16. Safety Recommendations READ CAREFULLY Be sure about that the use of this product is allowed in your country and in the environment required. The use of this product may be dangerous and has to be avoided in the following areas: x Where it can interfere with other electronic devices in environments such as hospitals, airports, aircrafts, etc. x Where there is risk of explosion such as gasoline stations, oil refineries, etc.
LE920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 17.
