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Telit Wireless Solutions LE920, Руководство пользователя по оборудованию

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L

LE920 Hardware User Guide

1vv0301026 Rev.0 - draft4 – 2013-05-

Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.   

Page 46 of 76 

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.

 

Front End Design Considerations 

When using the Telit LE920, since there’s no antenna connector on the module, the antenna 
must be connected to the LE920 through the PCB with the antenna pad.  

In the case that the antenna is not directly connected at the antenna pad of the LE920, then a 
PCB line is required. 

This line of transmission shall fulfill the following requirements: 

Antenna 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 with 
the FCC and/or IC requirements. 

This device is to be used only for mobile and fixed application.   

6.5.4.

 

GPS/GNSS Antenna - PCB Line Guidelines 

x

 

Ensure that the antenna line impedance is 50ohm. 

x

 

Keep line on the PCB as short as possible to reduce the loss. 

x

 

Antenna line must have uniform characteristics, constant cross section, avoid meanders 
and abrupt curves. 

x

 

Keep one layer of the PCB used only for the Ground plane; if possible. 

x

 

Surround (on the sides, over and under) the antenna line on PCB with Ground.   Avoid 

Содержание LE920

Страница 1: ...L LE920 H Hardware User Guide 1vv0301026 Rev 0 draft4 2013 05 21 Preliminary...

Страница 2: ...ware User Guide 1vv0301026 Rev 0 draft4 2013 05 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 2 of 76 APPLICABILITY TABLE PRODUCT LE920...

Страница 3: ...rve 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 ma...

Страница 4: ...ranslated into any language or computer language in any form or by any means without prior written permission of Telit High Risk Materials Components units or third party products used in the product...

Страница 5: ...n 12 2 1 Overview 12 2 2 LE920 Mechanical Dimensions 13 2 3 Weight 13 2 4 Environmental requirements 14 2 4 1 Temperature range 14 2 4 2 RoHS compliance 14 2 5 Operating Frequency 15 2 5 1 1 WCDMA1700...

Страница 6: ...36 5 2 1 3 Battery Source Power Supply Design Guidelines 38 5 2 2 Thermal Design Guidelines 39 5 2 3 Power Supply PCB Layout Guidelines 40 6 Antenna s 42 6 1 GSM WCDMA LTE Antenna Requirements 42 6 2...

Страница 7: ...k Service Availability 59 11 6 RTC Bypass Out 60 11 7 VAUX Power Output 60 12 ADC section 61 12 1 ADC Converter 61 12 1 1 Description 61 12 1 2 Using ADC Converter 61 13 Mounting the module on your bo...

Страница 8: ...4 2013 05 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 8 of 76 15 Packing system 72 15 1 Tray Drawing 73 15 2 Moisture Sensibility 74 1...

Страница 9: ...about to implement their applications using our LE920 module 1 3 Contact Information Support For general contact technical support to report documentation errors and to order manuals contact Telit s T...

Страница 10: ...Commands How to control the module via hardware Chapter 5 Power Supply deals on supply and consumption Chapter 6 Antenna The antenna connection and board layout design are the most important parts in...

Страница 11: ...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 Informa...

Страница 12: ...ions to be avoided must be considered as mandatory while the suggested hardware configurations must not be considered mandatory instead the information given must be used as a guide and a starting poi...

Страница 13: ...en without written authorization from Telit Communications S p A All Rights Reserved Page 13 of 76 2 2 LE920 Mechanical Dimensions The Telit LE920 module overall dimensions are Length 34 mm Width 40 m...

Страница 14: ...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 St...

Страница 15: ...5 1805 1880 512 885 95MHz PCS1900 1850 1910 1930 1990 512 810 80MHz WCDMA2100 B1 LE920 both models 1920 1980 2110 2170 Tx 9612 9888 Rx 10562 10838 190MHz WCDMA1900 B2 LE920 NA only 1850 1910 1930 1990...

Страница 16: ...1880 Tx 19200 19949 Rx 1200 1949 95MHz LTE1700 B4 LE920 NA only 1710 1755 2110 2155 Tx 19950 20399 Rx 1950 2399 400MHz LTE850 B5 LE920 NA only 824 849 869 894 Tx 20400 20649 Rx 2400 2649 45MHz LTE2600...

Страница 17: ...ady signal DSR to DTE 1 8V AJ18 C125 RING O Output for Ring indicator signal RI to DTE 1 8V Asynchronous Auxiliary UART AB19 TXD_AUX O Auxillary UART TX Data to DTE 1 8V AD19 RXD_AUX I Auxillary UART...

Страница 18: ...Command for Power ON Active Low AN12 SHDN_N I Unconditional Shut down Input Active Low F17 VRTC AI VRTC Backup Capacitor Power To be used to back up the RTC section P17 VAUX PWRMON O Supply Output for...

Страница 19: ...Ground D7 GND Ground E18 GND Ground F1 GND Ground G18 GND Ground H19 GND Ground M1 GND Ground N2 GND Ground P1 GND Ground P3 GND Ground R2 GND Ground T2 GND Ground T18 GND Ground U1 GND Ground V18 GND...

Страница 20: ...ND Ground AR6 GND Ground AR8 GND Ground AR10 GND Ground AR12 GND Ground AR14 GND Ground AR16 GND Ground AS5 GND Ground AS7 GND Ground AS9 GND Ground AS11 GND Ground AS13 GND Ground AS15 GND Ground AT4...

Страница 21: ...d G2 Reserved Reserved H1 Reserved Reserved H3 Reserved Reserved H17 Reserved Reserved J2 Reserved Reserved J18 Reserved Reserved K1 Reserved Reserved K3 Reserved Reserved K17 Reserved Reserved K19 Re...

Страница 22: ...TR pin must be connected in order to enter LE920 s power saving mode RI pin must be connected in order to wake up the host when a call is coming in sleep mode of host RTS must be connected to the GND...

Страница 23: ...L LE920 Hardware User Guide 1vv0301026 Rev 0 draft4 2013 05 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 23 of 76 AU11 AU15 AS1 ON OFF...

Страница 24: ...without written authorization from Telit Communications S p A All Rights Reserved Page 24 of 76 3 1 1 LGA Pads Layout NOTE The pin defined as RES has to be considered RESERVED and not connected on an...

Страница 25: ...w 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 It takes about 10 seconds to compl...

Страница 26: ...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 NOTE In this document all the lines a...

Страница 27: ...itional 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 m...

Страница 28: ...oes 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...

Страница 29: ...sed 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 The period of the finalization state can differ ac...

Страница 30: ...A simple circuit to do it is 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...

Страница 31: ...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 4 3 4 Hardware Unconditional Shutdown To unconditionally Shutdown LE920 the pad SH...

Страница 32: ...ing ON and OFF NOTE 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...

Страница 33: ...current consumption Mode Average mA Mode Description SWITCHED OFF Module supplied but switched Off Switched Off 40 uA IDLE mode Standby mode no call in progress AT CFUN 1 WCDMA 16 Normal mode full fu...

Страница 34: ...is not continuous and it is packed into bursts at a base frequency of about 216 Hz and the relative current peaks can be as high as about 2A Therefore the power supply has to be designed in order to w...

Страница 35: ...ically automotive x battery 5 2 1 1 5V Input Source Power Supply Design Guidelines x The desired output for the power supply is 3 8V hence there is not a big difference between the input source and th...

Страница 36: ...ent response This allows the regulator to respond quickly to the current peaks absorption x In any case the frequency and Switching design selection is related to the application to be developed due t...

Страница 37: ...ft4 2013 05 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 37 of 76 An example of switching regulator with 12V input is in the below sche...

Страница 38: ...ver the absolute maximum voltage for LE920 and damage it NOTE Do not use any Ni Cd Ni MH and Pb battery types directly connected with LE920 Their use can lead to overvoltage on LE920 and damage it Use...

Страница 39: ...minutes and then remains for quite a long time in idle let us say one hour then the power supply has always the time to cool down between the calls and the heat sink could be smaller than the calcula...

Страница 40: ...power regulator IC must be wide enough to ensure no voltage drops to occur when the 2A current peaks are absorbed Note that this is not made in order to save power loss but especially to avoid the vol...

Страница 41: ...ft4 2013 05 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 41 of 76 x The power supply input cables must be kept separately from noise se...

Страница 42: ...rder to connect with it or with its connector This transmission line shall fulfill the following requirements GSM WCDMA LTE Antenna Requirements Frequency range Depending by frequency band s provided...

Страница 43: ...und 0 3dB x Line geometry should have uniform characteristics constant cross section avoid meanders and abrupt curves x Any kind of suitable geometry structure can be used for implementing the printed...

Страница 44: ...Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s Bandwidth LE920 EU LE920 NA WCDMA band I 2100 250 MHz WCDMA band...

Страница 45: ...n external passive antenna GNSS pre Filter NOTE The external GNSS pre Filter shall be required for GLONASS application GNSS pre Filter requirement shall fulfill the following requirements z Source and...

Страница 46: ...tenna pad of the LE920 then a PCB line is required This line of transmission shall fulfill the following requirements Antenna Line on PCB Requirements Characteristic Impedance 50Ohm Max Attenuation 0...

Страница 47: ...care of shielding of antenna line by burying it inside the layers of PCB and surround it with Ground planes or shield it with a metal frame cover x If you do not have EM noisy devices around the PCB o...

Страница 48: ...ations 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 8V...

Страница 49: ...nostic 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 Trace lengths number of vias and capacitive l...

Страница 50: ...or other voltages different from 1 8V Depending on the type of serial port on the OEM hardware a level translator circuit may be needed to make the system work The only configuration that does not ne...

Страница 51: ...8 Data Set Ready Output from the LE920 that indicates the module is ready 7 RTS rts_uart AA18 Request to Send Input to the LE920 that controls the Hardware flow control 8 CTS cts_uart AK19 Clear to Se...

Страница 52: ...signals with lower levels on the RS232 side EIA TIA 562 allowing a lower voltage multiplying ratio on the level translator Note that the negative signal voltage must be less than 0V and hence some so...

Страница 53: ...AXIM 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 t...

Страница 54: ...20 module can be connected to external codec through digital interface The product is providing one Digital Audio Interface DVI on the following Pins PAD Signal I O Function Type COMMENT D11 DVI_WA0 I...

Страница 55: ...L LE920 Hardware User Guide 1vv0301026 Rev 0 draft4 2013 05 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 55 of 76...

Страница 56: ...vailable on the LE920 PAD Signal I O Function Type Drive Strength F9 GPIO_01 I O Configurable GPIO BH PD 1 8V 2 mA E10 GPIO_02 I O Configurable GPIO BH PD 1 8V 2 mA F11 GPIO_03 I O Configurable GPIO B...

Страница 57: ...digital pin when on 0 3V 2 16 V Input voltage on analog pins when on 0 3V 2 16 V Operating Range Interface levels 1 8V CMOS Level LE920 Min Max Input high level 1 5V 2 1V Input low level 0 3V 0 5V Ou...

Страница 58: ...rization from Telit Communications S p A All Rights Reserved Page 58 of 76 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...

Страница 59: ...to High Logic level a GPIO when the maximum temperature is reached 11 5 Indication of Network Service Availability The STAT_LED pin status shows information on the network service availability and cal...

Страница 60: ...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 VAUX Power Output A r...

Страница 61: ...ad 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 Min Max Units Input Voltage range 0 1 7 Volt AD conversion 8 bits Resolution 6 6 mV T...

Страница 62: ...n without written authorization from Telit Communications S p A All Rights Reserved Page 62 of 76 13 Mounting the module on your board 13 1 General The LE920 modules have been designed in order to be...

Страница 63: ...on 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 f...

Страница 64: ...3 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 m 13 5 PCB Pad Design Non solder mask defined NSMD typ...

Страница 65: ...ee following figure 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 Immersion Au 3 7 0...

Страница 66: ...ten authorization from Telit Communications S p A All Rights Reserved Page 66 of 76 13 7 Solder Paste Solder Paste Lead free Sn Ag Cu We recommend using only no clean solder paste in order to avoid th...

Страница 67: ...Temperature Max Tsmax Time min to max ts 150 C 200 C 60 180 seconds Tsmax to TL Ramp up Rate 3 C second max Time maintained above Temperature TL Time tL 217 C 60 150 seconds Peak Temperature Tp 245 0...

Страница 68: ...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...

Страница 69: ...the capacitance of the capacitors need to be selected accordingly The capacitor will also avoid the ripple of the power supplies and the switching noise caused in TDMA system like GSM Specially the su...

Страница 70: ...SIMRST O External SIM signal Reset 8KV 15KV B9 SIMIO I O External SIM signal Data I O 8KV 15KV A10 SIMCLK O External SIM signal Clock 8KV 15KV Miscellaneous Functions A18 USB_VBUS AI Power sense for t...

Страница 71: ...it 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 up...

Страница 72: ...ft4 2013 05 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 72 of 76 15 Packing system The Telit LE920 is packaged on trays Each tray cont...

Страница 73: ...L LE920 Hardware User Guide 1vv0301026 Rev 0 draft4 2013 05 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 73 of 76 15 1 Tray Drawing...

Страница 74: ...Reserved Page 74 of 76 WARNIG These trays can withstand a maximum temperature of 65 15 2 Moisture Sensibility The LE920 is a Moisture Sensitive Device level 3 in accordance with standard IPC JEDEC J...

Страница 75: ...autions 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...

Страница 76: ...expressly approved by the party responsible for compliance could void your authority to operate the equipment This device complies with part 15 of the FCC rules Operation is subject to the following t...

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