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HE910 Hardware User Guide

1. ness 41 6 7 ANTENNA DIVERSITY REQUIREMENTS poda Cadets con deco on Sod EPA ud ccu DT 41 7 155 RECEIVER ae een dd dan ea ten ed nn ONNO 44 FAM LRECEVER CHARACTERISTICS ERRORI 44 SON PINOT 44 NR EIEN a 45 7 3 1 GNSS Antenna PCB Line 45 ASA RF TOCE EOS CUIR TUN 46 733 GNSS Antenna Installation 46 29 fe 2 no f Bi A I 4 5 Lot mil t r 2 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 5 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 8 LOGICEEVELSPECIFICATIONS TIS ER a ne de de a tan ane Date de PETERET V 47 9 DUNCONDITIDNAESHUTDOEWNI uei or aan ci ane ana EN dU METER ice aa eo io dote le ous 48 10 a A Den tit ons 49 ONERE SEEN SCRIPT OWN MT T T 49 LI SERIAL PORTS na mn a ENS EMEN RU a nn ee Pa en io oran 50 LL L MODENTSERAEPORT a 51 MIO DEW Ed UMS SN M 52 11 5 o 23 2 LEVEL TRANSLATIONS add
2. 7 SCORE E 7 T AUDIENCE cese aed en cs ME MED ed EE 7 1 3 CONTACT INFORMATION SUPPORT ccccescececcececususeeucceeussueecsscessecessecesseeuseeeeseeeeeeeeeeeeuseeesessesesseseseeeuseeeeseeeeeeeeuseceuseseueeseeees 7 UN cag sata E nee nada loue tee tete one Cas Caen Lee ec ent ne cle oct 8 Lo PREGA D DOCUMENTS en m Rte Cd Li Ones tan tache na ne a Donne de ces 8 L 6 DOCUMENT FAIS TORY ae aa ee a de ea a et cn 9 2 elle 10 3 LE910 MODULE CONNECTION S ee ee ee ee enero terno ese se sesso se none sesso sese stes osse sesso se 11 NOR eee aui MEM 11 oie CEPI En 16 4 HARDWARE COMMANDS 99959204 1 18 1936109 17 A T1 TUBING ON TRE LEO a ID e esM a 17 ZZ INITIALIZATION AND ACTIVATION STAT E Primus 19 Z 3 TURNING OFFTHE LESTU a 20 4 3 1 Shutdown by Software x Rea totu iusqux Sa eu ME dap asta r eR Q
3. does 53 12 AUDIO SECTION OVERVIEW danse 55 12 MZ zen e EN I c EX ER es en 55 13 GENERAL PURPOSE I O 56 A E AE E E E E EAE E E E T E E 57 57 13 3 USING A PAD AS OUTPUT 57 13 4 INDICATION OF NETWORK SERVICE AVAILABILITY cccececccccccaccceccecccceceacecsacecencecenceceaceceacecsaceceacecsaceceacecsacecsacecsaceceaceceacecesenss 58 CSST a a ee 59 PO 59 60 VEN ANE Lee t 60 DC CONV CCH E 60 14 MOUNTING THE LE910 ON THE APPLICATION 61 61 14 2 MODULE FINISHING amp DIMENSIONS se se essere e 61 14 3 RECOMMENDED FOOT PRINT FOR THE APPLICATION sccccececcecsceaccceaceceaceceacecencecenceceacecsacecsncecsasecsaseceaces
4. iw 15 sec Above 15 i m 15 sec 9 tion All Rights Reserved page 25 of 80 2 f F ta L2 E v A 27 1 n 1 mM E Reproduction forbidden without Telit Communications S p A written authoriza lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 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 9 1 Power Supply Requirements The external power supply must be connected to VBATT amp VBATT PA signals and must fulfil the following requirements POWER SUPPLY Nominal Supply Voltage Normal Operating Voltage Range 3 40 V 4 20 V Extended Operating Voltage Range 3 10 V 4 35 V NOTE The Operating Voltage Range MUST never be exceeded care must be taken when designing the application s power supply section to avoid having an excessive voltage drop If the voltage drop 15 exceeding the limits it could cause a Power Off of the module The Power supply must be higher than 3 1 V to power on the module NOTE Overshoot voltage regarding MAX Extended Operating Voltage and drop in voltage regarding MIN Extended Operating Voltage MUST never be exceeded The Extended Operating Vol
5. HW Unconditional Shutdown Input command for power ON VRTC Backup capacitor Supply Output for external accessories Power ON Monitor Main power supply Baseband Main power supply Baseband Main power supply Radio PA Main power supply Radio PA Main power supply Radio PA Main power supply Radio PA Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8 CMOS 1 8V A D RF RF RF CMOS 1 8V 1 8V Active low 1 8V Active low Power backup for the embedded RTC supply 1 8V Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power en without Telit Communications S p A written authorization All Rights Reserved page 12 of 80 M3 N3 P3 R3 D4 M4 N4 P4 R4 NS PS R5 N6 P6 R6 PS RS P9 P10 R10 M12 B13 P13 E14 RESERVED C1 D1 B2 C2 D2 B3 C3 D3 E3 F3 G3 H3 J3 K3 L3 B4 GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED Reproduction forbidd Ground Ground Ground
6. Usage Output from the LE910 that indicates the carrier presence Output transmit line of LE910 UART Input receive of the LE910 UART Input to the LE910 that controls the DTE READY condition Ground Output from the LE910 that indicates the module is ready Output from the LE910 that controls the Hardware flow control Input to the LE910 that controls the Hardware flow control Output from the LE910 that indicates the incoming call condition According to V 24 some signal names are referred to the application side therefore on the LE910 side these signal are on the opposite direction TXD on the application side will be connected to the receive line here named C103 TXD on the application side will be connected to the transmit line here named C104 RXD NOTE For a minimum implementation only the XD lines can be connected the other lines can be left open provided a software flow control is implemented 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 LE910 when the module is powered off or during an ON OFF transition Reproduction forbidden without Telit Communicat ions S p A written authorization All Rights Reserved d e dia i n d page 51 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 11 2 MODEM SERIAL PORT 2 USIF1 The secon
7. 10 10 2014 13 7 ADC Converter 13 7 1 Description The LE910 is provided by one AD converter It is able to read a voltage level in the range of 0 1 7 volts applied on ADC pin input store and convert it into 8 bit word The following table is showing the ADC characteristics Min Units Input Voltage range 0 1 7 Volt AD conversion 8 bits Resolution 6 6 mV The input line is named as ADC INI and it is available on Pad B1 13 7 2 Using ADC Converter An AT command is available to use the ADC function The command is ATZADC 1 2 The read value is expressed in mV Refer to SW User Guide or AT Commands Reference Guide for the full description of this function a 3 E c m a 4 Reproduction forbidden without Telit Communications S p A written authorization 77 jum All Rights Reserved page 60 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 Mounting LE910 on the application 14 1 General The LE910 modules have been designed in order to be compliant with a standard lead free SMT process 14 2 Module finishing amp dimensions e 0 70 05 I n 3 a E D N el a He a D D HH nee o Wo oo 11 D oo D SECTION 840 05 Pitch Bottom view Lead free Alloy Dimensions in mm Surface fin
8. The below figure shows the recommended circuit xE910 Module VBATT BLMISEGIOITNI VBATT BLM18 VBATT at 72 2 33pF 100uF N N N N TE I 1 oem oue ABS gt Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 34 of 80 6 1 LE910 Product Variants Product LE910 EUG LE910 NAG LE910 NVG LE910 SVG LE910 SKG 4 e Telit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 6 GSM WCDMA LTE Radio Section The following table is listing the main differences between the LE910 variants Supported 2G Bands Supported 3G bands Supported LTE bands GSM 900 DCS1800 B5 850 B8 900 B1 2100 17 700 5 850 GSM 850 PCS 1900 B5 850 B2 1900 B4 1700 B2 1900 Not supported B5 850 B2 1900 B13 700 B4 1700 Not supported Not supported B13 700 B4 1700 Not supported Not supported B3 1800 B5 850 6 2 TX Output Power 2 2 x f f 4 27 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 35 of 80 Band GSM 850 900 DCS1800 PCS 1900 EDGE 850 900 MHz EDGE 1800 1900 MHz WCDMA FDD B1 B2 B4 B5 B8 LTE FDD B2 B3 B4 B5 B7 B13 B17 B20 Power Class 4 2W 1W E2 0 5W Class E2 0 4W Class 3 0 25W Class 3 0
9. tiquette de certification du module donn doit tre pos e sur l appareil h te un endroit bien en vue en tout temps En l absence d tiquette l appareil h te doit porter une tiquette donnant le FCC ID et le IC du module pr c d des mots Contient un module d mission du mot Contient ou d une formulation similaire exprimant le m me sens comme suit 910 Contains FCC ID RI7LE9IONA Contains IC 5131A LE91I0NA LE9I0 NVG Contains FCC ID RI7LE9IONV Contains IC 5151A LE9IONV LE910 SVG Contains FCC ID RI7LE91I0SV Contains IC 5131A LE910SV CAN ICES 3 B NMB 3 B This Class B digital apparatus complies with Canadian ICES 003 Cet appareil num rique de classe B est conforme la norme canadienne ICES 003 B 3 E EE LE 2 2 es j gt e _ 4n LR 4 1 D a P 4 gt gt E 4 227525 2 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 80 of 80
10. 14 5 PCB pad design Non solder mask defined NSMD type is recommended for the solder pads on the PCB Copper Pad Solder Mask MM SMD NSMD Solder Mask Defined Non Solder Mask Defined forbidden without Telit Communications S p A written authorization All Rights Reserved page 64 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 6 PCB pad dimensions The recommendation for the PCB pads dimensions are described in the following image dimensions in mm 77 AAA Up yy LLL B 3 XA A Solder resist openings t n An 2 f Le j gt a f 4 Fm ue aS i 4 y d LS Reproduction forbidden without Telit Communications S p A written authorizati on AI Rights Reserved page 65 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 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 see following figure Inhibit area for micro via 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 3 7 005 0 15 good solder ability protection Au high shear force values The PCB must be able to resist
11. External SIM signal Presence active low External SIM signal Power supply for the SIM Digital Audio Interface WAO Digital Audio Interface RX Digital Audio Interface TX Digital Audio Interface CLK GPIO 01 STAT LED GPIO 02 GPIO 03 GPIO 04 Type CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V 1 8 3V 1 8 3V 1 8 3V CMOS 1 8 1 8 3V 1 8V 1 8V 1 8V 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V CMOS 1 8V 1vv0301089 Rev 4 10 10 2014 COMMENT Alternate Function STAT LED page 11 of 80 B14 C12 C13 K15 L15 G15 ADC B1 RF SECTION K1 F1 GNSS SECTION see R9 R7 GPIO 05 GPIO 06 GPIO 07 GPIO 08 GPIO 09 GPIO 10 ADC INI ANTENNA ANT DIV ANT GNSS GNSS LNA EN Miscellaneous Functions R13 R12 C14 R11 Power Supply M1 M2 2 1 P2 E1 G1 L1 A2 E2 F2 G2 H2 J2 K2 L2 R2 Reproduction forbidd HW SHUTDOWN ON VRTC VAUX PWRMON VBATT VBATT VBATT PA VBATT PA VBATT PA VBATT PA GND GND GND GND GND GND GND GND GND GND GND GND GND GND I O I O I O AI GPIO 05 06 07 08 GPIO 09 GPIO 10 Analog Digital converter input GSM EDGE UMTS Antenna 50 ohm Antenna Diversity Input 50 ohm GNSS Antenna 50 ohm Output enable for External LNA supply
12. 2 W GNSS YES YES YES YES YES 6 3 Sensitivity Band GSM 850 GSM 900 DCS 1800 PCS 1900 WCDMA FDD B1 WCDMA FDD B2 WCDMA FDD B5 WCDMA FDD 8 LTE FDD B2 LTE FDD B3 LTE FDD B4 LTE FDD B5 LTE FDD B7 LTE FDD B13 LTE FDD B17 LTE FDD B20 L Typical dBm 111 5 111 5 110 5 110 0 115 0 114 5 115 0 114 5 103 0 102 5 102 5 103 0 100 5 101 5 101 5 102 5 L 2 jog 3GPP minimum requirements dBm lt 102 0 lt 102 0 lt 102 0 lt 102 0 lt 106 7 lt 104 7 lt 106 7 lt 103 7 lt 94 3 lt 93 3 lt 96 3 lt 94 3 lt 94 3 lt 93 3 lt 94 3 lt 93 3 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 Note BER Class II 2 4446 Single Receiver BER Class II 2 4446 Single Receiver BER Class II 2 4446 Single Receiver BER Class II 2 4446 Single Receiver BER 0 196 12 2 Kbps Dual Receiver BER 0 196 12 2 Kbps Dual Receiver BER 0 196 12 2 Kbps Dual Receiver BER lt 0 1 12 2 Kbps Dual Receiver Throughput gt 95 10MHz Dual Receiver Throughput gt 95 10MHz Dual Receiver Throughput gt 95 10MHz Dual Receiver Throughput gt 95 10MHz Dual Receiver Throughput gt 95 10MHz Dual Receiver Throughput gt 95 10MHz Dual Receiver Throughput gt 95 10MHz Dual Receiver Throughput gt 95 10MHz Dual Receiver 27 Reproduction forbidden without Telit Communications S p A writte
13. 2G 3G LTE module YMMOPQOONETAI OYXIOAEIZ ATIAITHXZEIZ TI AOINE2 2 gt AIATAZEIXZ TH OAHTIAZ 1999 5 EK Alul rott Telit Communications S p A nyilatkozom hogy a 2G 3G LTE module megfelel a vonatkoz alapvet k vetelm nyeknek s az 1999 5 EC ir nyelv egy b el r sainak Finnish Telit Communications S p A vakuuttaa t ten ett 2G 3G LTE module tyyppinen laite on direktiivin 1999 5 EY oleellisten vaatimusten ja sit koskevien direktiivin muiden ehtojen mukainen French Par la pr sente Telit Communications S p A d clare que l appareil 2G 3G LTE module est conforme aux exigences essentielles et aux autres dispositions pertinentes de la directive 1999 5 CE Icelandic me l sir Telit Communications S p A yfir a 2G 3G LTE module er samr mi vi grunnkr fur og a rar kr fur sem ger ar eru tilskipun 1999 5 gt f A 29 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 75 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 Italian Con la presente Telit Communications S p A dichiara che questo 2G 3G LTE module conforme ai requisiti essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva 1999 5 0 Telit Communications S p A deklare ka 2G 3G LTE module atbilst Direktivas 1999 5 EK b t
14. Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power Power en without Telit Communications S p A written authorization Rights Rese LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 rved 4 e Telit page 13 of 80 B5 C5 C6 C7 N7 P7 N8 N9 A10 N10 N11 P11 B12 D12 N12 P12 F14 G14 H14 J14 K14 N13 L13 J13 M13 K13 H13 G13 F13 11 12 B11 B10 A9 A8 D14 A14 D13 E13 F15 H15 J15 Reproduction forbidd RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESER
15. LE910 EUG modules in all the countries of the European Union Final product integrating this module must be assessed against essential requirements of the 1999 5 EC R amp TTE Directive It should be noted that assessment does not necessarily lead to testing Telit Communications S p A recommends carrying out the following assessments RF spectrum use R amp TTE art 3 2 It will depend on the antenna used on the final product EMC R amp TTE art 3 1b Testing Health amp Safety R amp TTE art 3 1a Testing Alternately assessment of the final product against EMC Art 3 1b and Electrical safety Art 3 1a essential requirements can be done against the essential requirements of the EMC and the LVD Directives e Low Voltage Directive 2006 95 EC and product safety e Directive EMC 2004 108 EC for conformity for EMC m fos Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 77 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 16 2 FCC IC Regulatory notices Modification statement Telit has not approved any changes or modifications to this device by the user Any changes or modifications could void the user s authority to operate the equipment Telit n approuve aucune modification apport e l appareil par l utilisateur quelle qu en soit la nature Tout changement ou modification peuvent an
16. VSWR recommended lt 2 1 recommended for best sensitivity performance 7 3 1 GNSS Antenna PCB Line Guidelines so BJ f T fe E D 1 4 am uu o 4 gt m Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 45 of 80 Ensure that the antenna line impedance is 50ohm Keep the antenna line on the PCB as short as possible to reduce the loss Antenna line must have uniform characteristics constant cross section avoid meanders and abrupt curves Keep one layer of the PCB used only for the Ground plane if possible Surround on the sides over and under the antenna line on PCB with Ground avoid having other signal tracks facing directly the antenna line of track The ground around the antenna line on has to be strictly connected to the Ground Plane by placing vias once per 2mm at least Place EM noisy devices as far as possible from LE910 antenna line Keep the antenna line far away from the LE910 power supply lines Keep the antenna line far away from the LE910 GSM RF lines If you have EM noisy devices around the PCB hosting the LE910 such as fast switching ICs LCD and so on take care of the shielding of the antenna line by routing it in an inner layer of PCB and surround it with Ground planes or shield it with a metal frame cover If you do not have EM noisy devices around the P
17. 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 Telit Communications S p A written authorization All Rights uu page 57 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 13 4 Indication of network service availability The STAT LED pin status shows information on the network service availability and Call status The function is available as alternate function of GPIO 01 to be enabled using the AT GPIO 1 0 2 command In the LE910 modules the STAT LED needs an external transistor to drive an external LED Therefore the status indicated in the following table is reversed with respect to the pin status Device Status LED status Device off Permanently off Not Registered Permanently on Registered in Idle Blinking Period 1s on 2s off Depends on the event that triggers the wakeup in sync with network Paging Voice Call Active Permanently on Dial Up Blinking Period 1s on 2s off Registered in Idle 4 Power Saving A schematic example could be VBATT DL1 STAT LED LD Q1 GND S gt T TAY Y do p PDA 7 z gt 2 F gt S P 55 2 4 J I 5 s H Fay Mu Ut i Ma 7 Ty B i A v 4 zi 3 24 B lt LES 4 Re
18. level translator There are a multitude of them differing in the number of drivers and receivers and in the levels be sure to get a true RS232 level translator not a RS485 or other standards By convention the driver is the level translator from the 0 1 8 UART to the RS232 level The receiver is the translator from the RS232 level to 0 1 8V UART In order to translate the whole set of control lines of the UART you will need e 5 drivers 3 receivers NOTE Avoid any overvoltage condition on digital pins VAUX can be used always active during LE910 operation for any level translation or pullup pulldown on digital pins A J Ld Aa gt 22 Wr gt 2 ff Im Mi ed mda ns E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 53 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 An example of RS232 level adaptation circuitry could be done using a MAXIM transceiver MAX218 In this case the chipset is capable to translate directly from 1 8V to the RS232 levels Example done on 4 signals only fin I 1 9V E ON OFF MODULE R5232 MODULE 65232 NOTE In this case the length of the lines on the application has to be carefully checked to avoid problems in case of High Speed data rates on RS232 The RS232 serial port
19. provided by the network operator the customer shall use the most suitable antenna for that those band s GSM850 70 MHz GSM1900 PCS 140 MHz WCDMA band 1900 140 MHz WCDMA band V 850 70 MHz LTE Band II 1900 140 MHz LTE Band IV 1700 445 MHz LTE Band V 850 70 MHz LTE Band XVII 700 42 MHz 50 ohm 33dBm 2 W peak power in GSM 24dBm Average power in WCDMA amp LTE lt 0 1 limit to avoid permanent damage 2 1 limit to fulfil all regulatory requirements A page 37 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 ANTENNA REQUIREMENTS for LE910 NVG Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s Frequency range Bandwidth WCDMA band II 1900 140 MHz WCDMA WCDMA band V 850 70 MHz Bandwidth LTE Band IV 1700 445 MHz LTE LTE Band XIII 700 41 MHz Impedance 50 ohm Input power 24dBm Average power in WCDMA amp LTE VSWR absolute max lt 10 1 limit to avoid permanent damage VSWR recommended lt 2 1 limit to fulfil all regulatory requirements ANTENNA REQUIREMENTS for LE910 SVG Depending by frequency band s provided by the network operator the Fr ncy ran customer shall use the most suitable antenna for that those band s Bandwidth LTE Band IV 1700 445 MHz LTE LTE Band XIII 700 41 MHz Impedance 50 ohm Input power 24dBm Average
20. the higher temperatures which are occurring at the lead free 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 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 gt gt PT T T SARL Z IN Ae 4 i fe bot cr E 4 3 m 5 dii gt E d p e 4 4 z 2 Do Boden B m gt em v Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 66 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 7 Solder paste pf Leadfree Solder paste Sn Ag Cu We recommend using only no clean solder paste in order to avoid the cleaning of the modules after assembly 14 7 1 LE910 Solder reflow Recommended solder reflow profile Limit Up Limit Down Recommended Temperature a A a Sf lt LT fe 2 Le j Y 7 Tay ES b in B f 4 j Xe E 2 5 Reproduction forbidden without Telit Communications S p A written authorization All Rights R
21. to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna ncrease the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Labelling Requirements for the Host device The host device shall be properly labelled to identify the modules within the host device The certification label of the module shall be clearly visible at all times when installed in the host device otherwise the host device must be labelled to display the FCC ID and IC of the module preceded by the words Contains transmitter module or the word Contains or similar wording expressing the same meaning as follows LE910 NAG Contains FCC ID RI7ZLE910NA Contains IC 5131 A LE910NA LE910 NVG Contains FCC ID RI7ZLE910NV Contains IC 5131 A CLE910NV a mp a 4 ais 3 x sii gt 4 L 2 me m Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 79 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 LE910 SVG Contains FCC ID RI7LE910SV Contains IC 5131 A CLE910SV L appareil h te doit tre tiquet comme il faut pour permettre l identification des modules qui s y trouvent L
22. uM E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 73 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 15 SAFEI Y RECOMMANDATIONS 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 theref
23. using a linear regulator a proper heat sink shall be provided in order to dissipate the power generated e A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks close to LE910 a 100uF tantalum capacitor is usually suited e Make sure the low ESR capacitor on the power supply output usually a tantalum one is rated at least 10V protection diode should be inserted close to the power input in order to save the LE910 from power polarity inversion s A39 L Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 28 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 An example of linear regulator with 5V input is 5 IN U1 3 8V OUT LT1528 D1 C1 C2 16KA 39nF 1OuF R2 390 5 3 1 2 12V input 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 15 not suited and shall not be used A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by the LE910 e 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 a
24. 0pF 4TK R2 4 7K GND CT CB 1000uF tuF Reproduction forbidden without Telit Commuiiitdtions S p A written authorization All Rights h page 30 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 5 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 15 suited for supplying the power to the Telit LE910 module WARNING The three cells Ni Cd or 3 6 V Nom Battery types or 4V PB types MUST NOT BE USED DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the LE910 and damage it NOTE DON T USE any Ni Cd Ni MH and Pb battery types directly connected with LE910 Their use can lead to overvoltage on the LE910 and damage it USE ONLY Li Ion battery types A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks 100uF tantalum capacitor is usually suited e Make sure the low ESR capacitor usually a tantalum one is rated at least 10V e A protection diode should be inserted close to the power input in order to save the LE910 from power polarity inversion Otherwise the battery connector should be done in a way to avoid polarity inversions when connecting the battery The battery capacity must be at least 5 00mAh in order to with
25. 10 Unconditional Shutdown The Unconditional Shutdown of the module could be activated using the HW SHUTDOWN line pad R13 WARNING The hardware unconditional Shutdown 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 To unconditionally shutdown the LE910 the pad HW SHUTDOWN must be tied low for at least 200 milliseconds and then released NOTE Do not use any pull up resistor on the HW SHUTDOWN line nor any totem pole digital output Using pull up resistor may bring to latch up problems on LE910 power regulator and improper functioning of the module The line HW SHUTDOWN must be connected only in open collector configuration The HW SHUTDOWN is generating an unconditional shutdown of the module without automatic restart The module will shutdown but will NOT perform the detach from the cellular network To proper power on again the module please refer to the related paragraph Powering ON the 910 The unconditional hardware shutdown must always be implemented on boards and should be used only as an emergency exit procedure TE forbidden without Telit Communications S p A written authorization All Rights h page 22 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 A typical circuit 15 the following HW SHUTDOWV N OV Uncondi
26. 89 Rev 4 10 10 2014 13 General Purpose 1 0 x f J H 4 27 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved The LE910 module is provided by a set of Digital Input Output pins 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 LE910 firmware and acts depending on the function implemented The following table shows the available GPIO on the LE910 Drive PAD Signal T O Function Type cuni Note C8 GPIO 01 I O Configurable GPIO 1 mA C9 GPIO02 Configurable GPIO Ee j 1 mA C10 03 Configurable GPIO ur p 1 mA GPIO04 Configurable GPIO EP rs 1 mA B14 GPIO05 Configurable GPIO 1 mA C12 06 Configurable GPIO BP Ps 1 mA C13 GPIO 07 I O Configurable GPIO EE d 1 mA K15 GPIO_08 I O Configurable GPIO s es 1 mA 115 GPIO 09 I O Configurable GPIO Eas pus 1 mA G15 10 I O Configurable GPIO a pd 1 mA BH PD Bidirectional digital with CMOS input High voltage tolerant Contains an internal pull down device NOTE In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digita
27. A TOTAL 100 Modules lt lt Shielding amp ESD envelope x2 UPPERSIDE 7 Cardboard box WARNING These trays can withstand at the maximum temperature of 65 C i amp e Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 69 of 80 wireless solutions LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 0 e 82 T P o 1731 TES e UN N we N N na S S wara N S N N S S S S N S S S S S lt IKKS SSSR RER 10 5 Ohms per squore HE 910 Module Cond Diss PS 7 10 Conductive Dissipative Surface gt SN d SSSSSM lt TSS SK a N N N u N gt N ws gt N N a m N 5 3 S N 5 5 2 NS S e 3 4 N 1 D lt ot e S wo wv NY NY Ny 2 ZA II D e N ue c lt ws a ve uw oo 0 as a lt lt a o we ow 000 QUOTE D CONTROLLO N N N N N N N N N N N N S N N N N N N N S S
28. CB of LE910 use for the antenna line a microstrip or G CPW line on an outer layer of the PCB since in this case the line attenuation 15 lower in comparison to a buried one lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 7 3 2 RF Trace Losses RF Trace losses are difficult to estimate on a PCB without having the appropriate tables or RF simulation software to estimate what the losses would be A good rule of thumb would be to keep the RF traces as short as possible make sure they are 50 ohms impedance and don t contain any sharp bends 7 3 3 GNSS Antenna Installation The LE91O due to its characteristics of sensitivity is capable to perform a Fix inside the buildings In any case the sensitivity could be affected by the building characteristics i e shielding The Antenna must not be co located or operating in conjunction with any other antenna or transmitter The isolation between GPS GNSS antenna and main GSM WCDMA LTE antenna must be at least 10 dB all uplink bands e Antenna must not be installed inside metal cases Antenna must be installed also according to the Antenna manufacturer instructions gt i EE RE nm 2 4 ee 2 Ld 4 4 2 7 y f 1 i m x Reproduction forbidden without Telit Communications S p A written authorization 77 jum All Rights Reserved page 46 o
29. DMA band 1900 60 MHz WCDMA band V 850 25 MHz LTE Band II 1900 60 MHz LTE Band IV 1700 45 MHz LTE Band V 850 25 MHz LTE Band XVII 700 12 MHz 50 ohm lt 2 1 recommended for best sensitivity performance DIVERSITY ANTENNA REQUIREMENTS for LE910 NVG Frequency range Bandwidth WCDMA Bandwidth LTE Impedance VSWR recommended Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s WCDMA band II 1900 60 MHz WCDMA band V 850 25 MHz LTE Band IV 1700 45 MHz LTE Band XIII 700 10 MHz 50 ohm lt 2 1 recommended for best sensitivity performance DIVERSITY ANTENNA REQUIREMENTS for LE910 SVG Frequency range Bandwidth LTE Impedance VSWR recommended Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s LTE Band IV 1700 45 MHz LTE Band XIII 700 10 MHz 50 ohm lt 2 1 recommended for best sensitivity performance page 42 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 DIVERSITY ANTENNA REQUIREMENTS for LE910 SKG Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s Frequency range Bandwidth LTE band III 1800 75 MHz LTE LTE Band V 850 25 MHz Impedance 50 ohm VSWR recommend
30. M TX and RX mode LOW Band CSD PL5 223 GSM VOICE CALL High Band CSD PLO 173 GPRS 2TX 3RX LOW Band Max Power 394 GPRS Sending data mode High Band Max Power 282 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 if the LE910 supports GSM operation 3 fe i amp Jj 7 SO Ha L cows Fy o Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 27 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 9 9 General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps e the electrical design e the thermal design e the PCB layout 5 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 5 input typically PC internal regulator output 12V input typically automotive e Battery 5 3 1 1 5V input Source Power Supply Design Guidelines e 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 e When
31. Pom 4 lets ae AS ee Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 18 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 4 2 Initialization and Activation state The LE910 takes about 15 seconds to complete internal initialization and to be ready for normal operation VBATTERY ie Re m olihi RR mi i i i Di Re pue RR RR RR cd n i ii bi mds nd n RR RR RR Rd m m bi o Di hiiia m uw SOR RR RR cR RR Rd ma on Rd n mi 1 1 ii ON OFF 1 i 1 1 1 monitoring PWRMON status PWRMON 15 sec e NOTE Any kind of AT command is not available during the nitialization state DTE can send AT commands only in Activation state 4 2 2 2 Ms NE 4 f f d j 1 4 E 27 n Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 19 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 4 3 Turning OFF the LE910 Turning off of the device can be done in two ways via AT command see LE910 Soft
32. S S S S N S N N N S N S S S S 7 lt gt Ls e S wS 23 Lil lt gt lt tu lt gt 4 em E Lu lt uc a i Lai a lt gt lt wo wow 1 5 ov Hz lt gt z OO oan e a v c lt gt i lt gt o v 00 21 421 90 GOW 192106 Bereiareed 914612 116 129422132 PO s 1919 9 Lite 922082710 6 4119 wei HOT MIRE 93110622 26 at patiad q jeo jira Jaded tigi cT n without Telit Communications S p A written authorization All Rights Reserved page 70 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 9 Packing System Reel The LE910 can be packaged on reels of 200 pieces each oee figure for module positioning into the carrier Reel xE910 module DIRECTION OF UNREELING Carrier Tape NOT Rounded ti Corner or 44 0 ic 0 4 0 05 soir 0 00 5 05 10 10 Direction tion All Rights Reserved page 71 of 80 n 1 2 4 2 I ut 2 Lo
33. T GNSS If the GNSS is not used it could be left unconnected RTS pin should be connected to the GND on the module side if flow control is not used The above pins are also necessary to debug the application when the module is assembled on it so we recommend connecting them also to dedicated test point d e dia i n d Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 15 of 80 eli LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 3 1 1 LGA Pads Layout TOP VIEW ADC_INi RES RES ANT DIV GND GND ANT GND GND 2 CD n e Z orae B H T CIORT C108 DT C107 DS TX AUX RX AUX CIO4RX CIONTX 1 C125 RI VRTC NG o NOTE The pin defined as RES has to be considered RESERVED and not connected on any pin in the application Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 16 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 4 Hardware Commands 4 1 Turning ON the LE910 PRP E 2 2 2 es j 4 4 y M WM 4 9 4 d i Rep
34. VED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED en without Telit Communications S p A written authorization Rights Rese LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 rved 4 e Telit page 14 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 WARNING Reserved pins must not be connected NOTE If not used almost all pins should be left disconnected The only exceptions are the following pins PAD Signal Notes M1 M2 N1 N2 P1 P2 VBATT amp VBATT_PA E1 G1 H1 J1 L1 A2 E2 F2 G2 H2 J2 K2 L2 R2 M3 N3 P3 R3 D4 M4 N4 P4 R4 N5 P5 R5 N6 P6 R6 P8 END R8 P9 P10 R10 M12 B13 P13 E14 R12 ON OFF R13 HW SHUTDOWN B15 USB If not used should be connected to a Test Point or an USB connector C15 USB_D If not used should be connected to a Test Point or an USB connector A13 VUSB If not used should be connected to a Test Point or an USB connector N15 C103 TXD If not used should be connected to a Test Point M15 C104 RXD If not used should be connected to a Test Point D15 TXD_AUX If not used should be connected to a Test Point E15 RXD_AUX If not used should be connected to a Test Point MAIN ANTENNA F1 ANT DIV RO AN
35. ace from the capacitor to the LE910 is wide enough to ensure a dropless connection even during the 2A current peaks e The protection diode must be placed close to the input connector where the power source is drained The PCB traces from the input connector to the power regulator IC must be wide enough to ensure no voltage drops 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 voltage drops on the power line at the current peaks frequency of 216 Hz that will reflect on all the components connected to that supply introducing the noise floor at the burst base frequency For this reason while a voltage drop of 300 400 mV may be acceptable from the power loss point of view the same voltage drop may not be acceptable from the noise point of view If your application doesn t have audio TE forbidden without Telit Communications S p A written authorization All Rights AA page 32 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 interface but only uses the data feature of the Telit LE910 then this noise is not so disturbing and power supply layout design can be more forgiving The PCB traces to the LE91O and the Bypass capacitor must be wide enough to ensure no significant voltage drops occur when the 2A current peaks are absorbed This 15 for the same reason as previous point Try to keep this trace as short as possible The PCB
36. al port on the OEM hardware a level translator circuit may be needed to make the system work On the LE910 the ports are CMOS 1 8 The electrical characteristics of the Serial ports are explained in the following tables Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any digital pin CMOS 1 8 with 0 3 2 16V respect to ground Operating Range Interface levels 1 8V CMOS Level Min Max Input high level 1 5V 2 1V Input low level OV 0 5V Output high level 1 35V 1 8 Output low level OV 0 45V H Ld sf m 4 5 l i PE H f L4 f Im Mi p f E e Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 50 of 80 11 1 MODEM SERIAL PORT 1 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 The serial port 1 on the LE910 is a 1 8V UART with all the 7 RS232 signals It differs from the PC RS232 in the signal polarity RS232 is reversed and levels RS232 Signal Pin 1 C109 DCD 2 C104 RXD 3 C103 TXD 4 C108 DTR 5 GND 6 C107 DSR 7 C106 CTS 8 C105 RTS 9 C125 RING NOTE LE910 Pad Number N14 M15 N15 M14 M12 B13 P13 E14 P14 P15 L14 R14 Name Data Carrier Detect Transmit line see Note Receive line see Note Data Terminal Ready Ground Data Set Ready Clear to Send Request to Send Ring Indicator
37. art 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 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 Trademarks TELIT and the Stylized T Logo are registered in Trademark Office other product or service names are the property of their respective owners Copyright O Telit Communications S p A 2014 t 4 gt P 1 TEE gt y 7 1 Les T ICA y r amp Rd bo m EE Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 4 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 Contents 1 INTRODUCTION rc
38. bsorption e n 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 e 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 e A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks 100uF tantalum capacitor is usually suited lt A gt T lt y Tm T 2 5 5 Te Bl c E p Y B 4 EP BM S Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 29 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 e Make sure the low ESR capacitor on the power supply output usually a tantalum one is rated at least 10V e For Car applications a spike protection diode should be inserted close to the power input in order to clean the supply from spikes e A protection diode should be inserted close to the power input in order to save the LE910 from power polarity inversion This can be the same diode as for spike protection An example of switching regulator with 12V input is in the below schematic 12V U1 L5973D 3 8 OUT C1 C2 39nF TOuF Zn C4 27
39. by the end product e If the device antenna 1s located less than 20cm from the human body or there are no co located transmitter then the additional FCC IC testing may be required for the end product Telit FCC IC approvals cannot be reused 6 Antenna Diversity Requirements This product is including an input for a second RX antenna to improve the data throughput The function 15 called Antenna Diversity in WCDMA mode and downlink MIMO in LTE mode DIVERSITY ANTENNA REQUIREMENTS for LE910 EUG Frequency range Bandwidth WCDMA Bandwidth LTE Impedance VSWR recommended Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s WCDMA band 2100 60 MHz WCDMA band V 850 25 MHz WCDMA band VIII 900 35 MHz LTE band III 1800 75 MHz LTE Band VII 2600 70 MHz LTE Band XX 800 30 MHz 50 ohm lt 2 1 recommended for best sensitivity performance mee L d id 5 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 41 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 DIVERSITY ANTENNA REQUIREMENTS for LE910 NAG Frequency range Bandwidth WCDMA Bandwidth LTE Impedance VSWR recommended Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s WC
40. dary serial port on the LE910 is composed by only the RX and TX lines The signals of the LE910 serial port are PAD Signal T O Function Type COMMENT D15 TX_AUX O Auxiliary UART TX Data to DTE 1 8V E15 RX_AUX I Auxiliary UART RX Data from DTE 1 8V 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 LE910 when the module is powered off or during an ON OFF transition Ld SR 2 2 2 es j 2 4 Jf 4 png m we Reproduction forbidden without Telit Communications S p A written authorization 77 jm AIT Rights Reserved page 52 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 11 3 RS232 level translation In order to interface the LE910 with a PC com port or a RS232 EIA TIA 232 application a level translator is required This level translator must invert the electrical signal in both directions Change the level from 0 1 8V to 15 15V Actually the RS232 UART 16450 16550 16650 amp 16750 chipsets accept 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 OV and hence some sort of level translation 15 always required The simplest way to translate the levels and invert the signal is by using a single chip
41. differential Data 3 3V C15 USB D I O USB differential Data 3 3V Power sense to activate internal sy USB active 2 0 V to A13 VUSB AI USB transceiver 5 25 V with nternal pull down 10K The USB DPLUS and USB DMINUS signals have a clock rate of 480 MHz The signal traces should be routed carefully Trace lengths number of vias and capacitive loading should be minimized additional ESD protection must be carefully evaluated The characteristic impedance value should be as close as possible to 90 Ohms differential gt gt x ss _ TY EME fz A 2 E j m I3 2 j 1 728 45 4 y Muf Ns y H i A 2 4 zi 45 t dh lt LES 4 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 49 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 11 Serial Ports The LE910 module is provided with by 2 Asynchronous serial ports MODEM SERIAL PORT 1 Main e SERIAL PORT 2 Auxiliary Several configurations can be designed for the serial port on the OEM hardware but the most common are RS232 PC com port e microcontroller UART 1 8V Universal Asynchronous Receive Transmit microcontroller UART 5V or other voltages different from 1 8V Depending from the type of seri
42. ducts This document is subject to change without notice m Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 10 of 80 4 e Telit LE910 Hardware User Guide 3 LE910 module connections 3 1 PIN OUT PAD USB HS 2 0 COMMUNICATION PORT B15 C15 A13 Signal USB USB D VUSB I Function USB differential Data USB differential Data Power sense for the internal USB transceiver Asynchronous Serial Port USIF0 Prog Data HW Flow Control N15 C103 TXD I M15 C104 RXD O M14 C108 DTR I L14 C105 RTS I P15 C106 CTS O N14 C109 DCD O P14 C107 DSR O R14 C125 RING O Asynchronous Auxiliary Serial Port USIF1 D15 TX_AUX O E15 RX_AUX I SIM card interface A6 SIMCLK O A7 SIMRST O AS SIMIO I O A4 SIMIN I A3 SIMVCC Digital Voice Interface DVI B9 DVI_WAO VO B6 DVI RX I B7 DVI TX I O B8 DVI CLK I O DIGITAL IO C8 GPIO 01 C9 GPIO 02 10 03 11 GPIO 04 I O Serial data input from DTE Serial data output to DTE Input for DTR from DTE Input for Request to send signal RTS from DTE Output for Clear to Send signal CTS to DTE Output for DCD to DTE Output for DSR to DTE Output for Ring RI to DTE Auxiliary UART TX Data to DTE Auxiliary UART RX Data from DTE External SIM signal Clock External SIM signal Reset External SIM signal Data I O
43. e 1 2 Audience This document is intended for Telit customers who are integrators about to implement their applications using our LE910 modules 1 3 Contact Information Support For general contact technical support to report documentation errors and to order manuals contact Telit s Technical Support Center TTSC at TS EMEA telit com TS NORTHAMERICA telit com TS LATINAMERICA telit com TS APAC telit com Alternatively use http www telit com en products technical support center contact php For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit http www telit com To register for product news and announcements or for product questions contact Telit s Technical Support Center TTSC 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 F1 2 t d F 4 2 2 fz 2 4 y 1 E 4 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 7 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 1 4 Text Conventions Danger This information MUST be followed or catastrophic equipment failure or bodily injury may occur 1 Caution or Warning Alerts the user to important points about integrating the module
44. ed lt 2 1 recommended for best sensitivity performance When using the LE910 since there s no antenna connector on the module the antenna must be connected to the LE910 antenna pad F1 by means of a transmission line implemented on the PCB In the case the antenna is not directly connected at the antenna pad of the LE910 then a PCB line is needed in order to connect with it or with its connector The 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 For the same reason the Rx antenna should also be cross polarized with respect to the main antenna Isolation between main antenna and Rx antenna must be at least 10 dB in all uplink frequency bands Envelope Correlation Coefficient ECC value should be as close as possible to zero for best diversity performance ECC values below 0 5 on all frequency bands are recommended Ld 2 2 fe 27 PE RE 4 2 4 m i Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 43 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 7 GNSS Receiver The LE910 module is integrating a GNSS receiver
45. en authorization All Rights uu page 78 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 Cet appareil est conforme aux limites d exposition aux rayonnements de la IC pour un environnement non contr l L antenne doit tre install de fa on garder une distance minimale de 20 centim tres entre la source de rayonnements et votre corps Gain de l antenne doit tre ci dessous Bande de fr quence LE910 NAG LE910 NVG LE910 SVG 700 MHz 8 74 dBi 9 16 dBi 6 93 dBi 850 MHz 6 93 dBi 9 42 dBi N A 1700 MHz 5 00 dBi 5 00 dBi 5 00 dBi 1900 MHz 2 51 dBi 8 01 dBi N A L metteur ne doit pas tre colocalis ni fonctionner conjointement avec autre antenne ou autre metteur FCC Class B digital device notice This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try
46. eserved page 67 of 80 Profile Feature Average ramp up rate Tr to Tp Preheat Temperature Min Tsmin Temperature Max Tsmax Time min to max ts Tsmax to TL Ramp up Rate Time maintained above Temperature TL Time tL Peak Temperature Tp Time within 5 of actual Peak Temperature tp Ramp down Rate Time 25 C to Peak Temperature lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 Pb Free Assembly 3 C second max 150 C 200 C 60 180 seconds 3 C second max 217 60 150 seconds 245 0 5 C 10 30 seconds 6 C second max 8 minutes max NOTE temperatures refer to topside of the package measured on the package body surface WARNING The LE910 module withstands one reflow process only H Ld sf m 4 l i PE H f L4 f Im Mi p f E e Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 68 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 8 Packing system The LE910 modules are packaged on trays of 20 pieces each These trays can be used in SMT processes for pick amp place handling TMax 65 C _HE910 modules x20 B p F pn 2 UC p o em EE
47. f 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 8 Logic level specifications The following table shows the logic level specifications used in the LE910 interface circuits Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any digital pin CMOS 1 8 with respect 0 3V 2 16V to ground Operating Range Interface levels 1 8V CMOS Level Min Max Input high level 1 5V 2 1V Input low level OV 0 5V Output high level 1 35V 1 8 Output low level OV 0 45V a gt EL 2 7 gt f y b M7 1 gt a AE Leser F i Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 47 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 9 Unconditional Shutdown Signal Function T O PAD HW SHUTDOWN Unconditional Shutdown of the Module I R13 HW SHUTDOWNY is used to unconditionally shutdown LE910 Whenever this signal is pulled low LE910 is reset When the device is reset it stops any operation After the release of the line the LE910 is unconditionally shut down without doing any detach operation from the network where it is registered This behaviour is not a proper shut down because any GSM device is requested to issue a detach request on turn off For this reason the HW SHUTDOWN signal must not be used to normally shut
48. gration of GSM GPRS WCDMA LTE LE910 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 WCDMA LTE LE910 all interno dell applicazione dell utente dovr rispettare le indicazioni progettuali descritte in questo manuale DE Die Integration des LE910 GSM GPRS WCDMA LTE Mobilfunk Moduls in ein Ger t mu gem der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen SL Integracija GSsM GPRS WCDMA LTE LE910 modula v uporabni ki aplikaciji bo morala upo tevati projektna navodila opisana v tem priro niku SP La utilizaci n del modulo GSM GPRS WCDMA LTE LE910 debe ser conforme a los usos para los cuales ha sido desefiado descritos en este manual del usuario FR L int gration du module cellulaire GSM GPRS WCDMA LTE LE910 dans l application de l utilisateur sera faite selon les r gles de conception d crites dans ce manuel HE eran TAN 21 1022 mew nom ns ae Tower NET 09 LE910 The information presented in this document is believed to be accurate and reliable However no responsibility is assumed by Telit Communications S p A for its use nor any infringement of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent rights of Telit Communications S p A other than for circuitry embodied in Telit pro
49. 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 dates are in ISO 8601 format 1 e Y YY Y MM DD 1 5 Related Documents LE910 Product description 80421ST10587a e SIM Holder Design Guides SOO0ONT10001a e AT Commands Reference Guide 80421ST10585A LE910 DVI Application Note 80000NT11246A e Telit EVK2 User Guide 1 vv0300704 YA 5 N gt ED i E ne II H ND ET 5 pr 4 s 4 7 i 2 E me bf H Ns 7 2 H i E A mt lt E Ric ec ae 22 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 8 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 1 6 Document History Revision Date Changes ISSUE 0 2013 11 07 Preliminary Version ISSUE 1 2013 12 20 Updated schematics amp tray drawing Added LE910 SVG and LE910 SKG LE910 EUG now Dual Band 2G CHERE 900 1800 added B5 WCDMA on LE910 EUG Added Conformity assessment issues section for LE910 NVG SVG and updated chapter 10 USB Updated Power Consumption values Updated STAT LED status table Updated Pad layou
50. ishing Ni Au for all solder pads Aa sh j vr 8 um Reproduction forbidden without Telit Communications S p A written authorization Rights Reserved page 61 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 DETAIL SCALE 8 1 20 5 page 62 of 80 mE without Telit Communications S p A written authorization All Rights Reserved lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 3 Recommended foot print for the application Inhibit Components L 28 40 LE E EJ EJ E EH JE EI E TOP VIEW In order to easily rework the LE910 15 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 7 a i E Reproduction forbidden without Telit Communications S p A written authorizati on All Rights Reserved page 63 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 4 Stencil Stencil s apertures layout can be the same of the recommended footprint 1 1 we suggest a thickness of stencil foil gt 120 um
51. iskajam prasibam un citiem ar to saistitajjem noteikumiem re n Telit Communications S p A deklaruoja amp 2G 3G LTE module atitinka esminius reikalavimus ir kitas 1999 5 EB Direktyvos nuostatas Maltese Hawnhekk Telit Communications S p A jiddikjara li dan 2G 3G LTE module CUT mal ti ijiet essenzjali ma provvedimenti o rajn relevanti li hemm fid Dirrettiva 1999 5 EC Telit Communications S p A erkl rer herved at utstyret 2G 3G LTE module er i samsvar med de grunnleggende krav og vrige relevante krav i direktiv 1999 5 EF Polish Niniejszym Telit Communications S p A o wiadcza e 2G 3G LTE module jest zgodny uli 2 zasadniczymi wymogami oraz pozostatymi stosownymi postanowieniami Dyrektywy 1999 5 EC Telit Communications S p A declara que este 2G 3G LTE module est conforme com os requisitos essenciais e outras disposi es da Directiva 1999 5 CE Telit Communications S p A t mto vyhlasuje Ze 2G 3G LTE module sp a z kladn po iadavky a v etky pr slu n ustanovenia Smernice 1999 5 ES Telit Communications S p A izjavlja da je ta 2G 3G LTE module v skladu z bistvenimi zahtevami in ostalimi relevantnimi dolo ili direktive 1999 5 ES Por medio de la presente Telit Communications S p A declara que el 2G 3G LTE module cumple con los requisitos esenciales y cualesquiera otras disposiciones aplicables o exigibles de la Directiva 1999 5 CE Swedish H rmed intygar Telit Communications S p A at
52. j 4 wee sae r f M res Reproduction forbidden without Telit Communications S p A written authoriza lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 9 2 Reel Detail page 72 of 80 Z e EN _ LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 14 9 3 Packaging Detail Device amp Packaging label Shielding amp ESD envelope UPPER SIDE Silica X3 S gt LOWER SIDE Humidity indicator Reel label 14 10 Moisture sensitivity The LE910 is a Moisture Sensitive Device level 3 in according with standard IPC JEDEC J STD 020 take care all the relatives requirements for using this kind of components Moreover the customer has to take care of the following conditions a Calculated shelf life in sealed bag 12 months at lt 40 C and lt 90 relative humidity RH b Environmental condition during the production 30 C 60 RH according to IPC JEDEC J STD 033A paragraph 5 c The maximum time between the opening of the sealed bag and the reflow process must be 168 hours if condition b IPC JEDEC J STD 033A paragraph 5 2 is respected d Baking is required if conditions b or c are not respected e Baking is required if the humidity indicator inside the bag indicates 10 RH or more 4 fe a j Lz es f 7 y i E INT i i AE s 5 uds 2 Toig DSL
53. l pins of the LE910 when the module is powered off or during an ON OFF transition page 56 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 13 1 GPIO Logic levels 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 LE910 interface circuits Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any digital pin CMOS 1 8 with respect to ground 0 3 2 16 Operating Range Interface levels 1 8V CMOS Level Min Max Input high level 1 5V 2 1V Input low level OV 0 5V Output high level 1 35V 1 8 Output low level OV 0 45V 13 2 Using a GPIO Pad 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 1 5V CMOS levels of the GPIO If the digital output of the device to be connected with the GPIO input pad has interface levels different from the 1 8V CMOS then it can be buffered with an open collector transistor with a 10K pull up to 1 8V 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 LE910 when the module is powered off or during an ON OFF transition 13 3 Using a GPIO Pad as OUTPUT The GPIO pads when used as outputs can drive 1 8 CMOS digital
54. lines are usually connected to a DB9 connector with the following layout DSR RS232 7 n ATS_R5232 5 D I 2 An 2 2 2 ge LJ E E 2 pr a A 2 4 1 Le Ajas gt f LES E 2 X Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 54 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 12 Audio Section Overview The Audio of the LE910 Module is carried by DVI digital audio interface The audio port can be directly connected to end device using digital interface or via one of the several compliant codecs in case an analog audio is needed 12 1 Electrical Characteristics The product is providing the Digital Audio Interface DVI on the following Pins Digital Voice Interface DVI PAD Signal IO Function Note Type B9 DVI WAO Digital Audio Interface B PD 1 8V B6 DVI RX I Digital Audio Interface RX B PD 1 8V B7 DVI TX O Digital Audio Interface TX B PD 1 8V BS DVI_CLK I O Digital Audio Interface BCLK B PD 1 8V 3 2 t d 4 2 2 fg RE 4 y 2 me m 4 we Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 55 of 80 lelit LE910 Hardware User Guide 1vv03010
55. n authorization All Rights Reserved page 36 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 6 4 GSM WCDMA LTE 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 LE910 device shall fulfil the following requirements ANTENNA REQUIREMENTS for LE910 EUG Frequency range Bandwidth GSM EDGE Bandwidth WCDMA Bandwidth LTE Impedance Input power VSWR absolute max VSWR recommended Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s GSM900 80 MHz GSM1800 DCS 170 MHz WCDMA band 2100 250 MHz WCDMA band V 850 70 MHz WCDMA band VIII 900 80 MHz LTE band III 1800 170 MHz LTE Band VII 2600 190 MHz LTE Band XX 800 71 MHz 50 ohm gt 33dBm 2 W peak power in GSM 24dBm Average power in WCDMA amp LTE lt 10 1 limit to avoid permanent damage lt 2 1 limit to fulfil all regulatory requirements ANTENNA REQUIREMENTS for LE910 NAG Frequency range Bandwidth GSM EDGE Bandwidth WCDMA Bandwidth LTE Impedance Input power VSWR absolute max VSWR recommended Depending by frequency band s
56. nuler le droit d utilisation de l appareil par l utilisateur Interference statement This device complies with Part 15 of the FCC Rules and Industry Canada licence exempt RSS standard s Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that may cause undesired operation of the device Le pr sent appareil est conforme aux CNR d Industrie Canada applicables aux appareils radio exempts de licence L exploitation est autoris e aux deux conditions suivantes 1 l appareil ne doit pas produire de brouillage et 2 l utilisateur de l appareil doit accepter tout brouillage radio lectrique subi m me si le brouillage est susceptible d en compromettre le fonctionnement Wireless notice This equipment complies with FCC and IC radiation exposure limits set forth for an uncontrolled environment The antenna should be installed and operated with minimum distance of 20 cm between the radiator and your body Antenna gain must be below Frequency band LE910 NAG LE910 NVG LE910 SVG 700 MHz 8 74 dBi 9 16 dBi 6 93 dBi 850 MHz 6 93 dBi 9 42 dBi N A 1700 MHz 5 00 dBi 5 00 dBi 5 00 dBi 1900 MHz 2 51 dBi 8 01 dBi N A This transmitter must not be co located or operating in conjunction with any other antenna or transmitter A A T MAN lt t Reproduction forbidden without Telit Communications S p A writt
57. ore 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 GSM 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 equipments introduced on the market All the relevant information s are available on the European Community website http europa eu int comm enterprise rtte dir99 5 htm The text of the Directive 99 05 regarding telecommunication equipments is available while the applicable Directives Low Voltage and EMC are available at http europa eu int comm enterprise electr equipment index en htm page 74 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 16 Conformity assessment issues 16 1 1999 5 EC Directive The LE910 EUG module has been evaluated against the essential requirements of the 1999 5 EC Directive Bulgarian Teli
58. power VSWR absolute max lt 10 1 limit to avoid permanent damage VSWR recommended lt 2 1 limit to fulfil all regulatory requirements ANTENNA REQUIREMENTS for LE910 SKG Depending by frequency band s provided by the network operator the Fr ncy ran customer shall use the most suitable antenna for that those band s Bandwidth LTE band III 1800 170 MHz LTE LTE Band V 850 70 MHz Impedance 50 ohm Input power 24dBm Average power VSWR absolute max lt 10 1 limit to avoid permanent damage VSWR recommended lt 2 1 limit to fulfil all regulatory requirements When using the LE910 since there s no antenna connector on the module the antenna must be connected to the LE910 antenna pad K1 by means of a transmission line implemented on the PCB In the case the antenna is not directly connected at the antenna pad of the LE910 then a PCB line is needed in order to connect with it or with its connector feud Reproduction Dodo Telit Communications S p A written authorization All Rights Reserved page 38 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 This transmission line shall fulfil the following requirements ANTENNA LINE ON PCB REQUIREMENTS Characteristic Impedance 50 ohm Max Attenuation 0 3 dB Coupling with other signals shall be avoided Cold End Ground Plane of antenna shall be equipotential to the LE910 ground pins Furthermore if the device 15 de
59. production forbidden without Telit Communications S p A written authorization All Rights Reserved page 58 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 13 5 RIC 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 NO Devices must be powered from this pin 13 6 VAUX Power Output A regulated power supply output is provided in order to supply small devices from the module The signal is present Pad R11 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 Level Min Typical Max Output voltage 1 75V 1 80V 1 85V Output current 100mA Output bypass capacitor inside the module luF gt PT T T CUN Z x IN Ae 2 NS fe g 4 3 m 5 dii gt E d PE fe m o 4 4 z 27 Shut m gt em v Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 59 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4
60. rn OFF LE910 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 LE910 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 LE910 is so it cannot be fixed definitely Normally it will be above 15 seconds later from releasing ON OFF and DTE should monitor the status of PWRMON to see the actual power off VBATTERY 2 sec lt HOLD TIME lt 3 sec ON OFF manc maman mm mmm um nnn monitoring PWRMON status PWRMON la Variable e Above 15 sec Internal state TIP To check if the device has been powered off the hardware line PWRMON must be monitored The device is powered off when PWRMON goes low 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 LE910 when the module is powered off or during an ON OFF transition e 2 4 fk C n 4 2 _ 2 4 A INT i lt j EL Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 21 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 4 4 LE9
61. roduction forbidden without Telit Communications S p A written authorization To turn on the LE910 the pad ON OFF must be tied low following timing diagram in Chapter 4 2 The maximum current that can be drained from the pad is 0 1 mA A simple circuit for this purpose is Power ON OFF impulse GND NOTE Don t use any pull up resistor on the ON OFF line it is internally pulled up Using pull up resistor may bring to latch up problems on the LE910 power regulator and improper power on off of the module The line ON OFF must be connected only in open collector or open drain configuration NOTE In this document all the lines that are inverted hence have active low signals are labelled with a name that ends with 77 or with bar over name TIP VAUX PWRMON pad can be monitored to check if LE910 has powered on lt A gt T lt y Tm T 2 5 33 Te d Bl c E p Y B 4 EP All Rights Reserved page 17 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 For example l Let s assume you need to drive the OFF pad with a totem pole output of a 43 5 V microcontroller uP_OUT 1 Q1 BC84 BW OV Power ON_OFF impulse GND 2 Let s assume you need to drive the ON OFF pad directly with an ON OFF button SNNT OFF Power ON OFF impulse GND
62. round 0 3 dB e ine geometry should have uniform characteristics constant cross section avoid meanders and abrupt curves e Any kind of suitable geometry structure Microstrip Stripline Coplanar Grounded Coplanar Waveguide can be used for implementing the printed transmission line afferent the antenna e f 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 e 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 e t is wise to surround on both sides the PCB transmission line with Ground avoid having other signal tracks facing directly the antenna line track e Avoid crossing any un shielded transmission line footprint with other signal tracks on different layers e 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 LE910 antenna line e Keep the antenna line far away from the LE910 power supply lines e 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 sur
63. round it with Ground planes or shield it with a metal frame cover e f EM noisy devices are not present around the line the use of geometries like Microstrip Grounded Coplanar Waveguide has to be preferred since they typically ensure less attenuation if compared to a Stripline having same length A T MAN lt t Reproduccion forbidden without Telit Communications S p A written authorization All Rights h page 40 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 6 6 GSM WCDMA LTE Antenna Installation Guidelines Install the antenna in a place covered by the GSM signal Antenna must not be installed inside metal cases Antenna shall also be installed according Antenna manufacturer instructions Antenna integration should optimize the Radiation Efficiency Efficiency values gt 50 are recommended on all frequency bands e Antenna integration should not dramatically perturb the radiation pattern It 1s preferable to get after antenna installation an omnidirectional radiation pattern at least in one pattern cut e Antenna Gain must not exceed values indicated in regulatory requirements where applicable in order to meet related EIRP limitations Typical antenna Gain in most M2M applications does not exceed 2dBi e If the device antenna is located greater than 20cm from the human body and there are located transmitter then the Telit FCC IC approvals can be re used
64. sacecsaceceacecsacecsaceceacenes 63 TAA 5 64 PURIS SLE REESE 64 T de ea ee anne ace ce de ce ce a eue de ec 65 SOLDER 67 TO Ft VEDA A Oel 67 69 14 9 PACKING SYSTEM UREEL 5 E 71 TOP 18 71 RO 72 Packaging 9 8 he 73 14 10 MOISTURE SENSITIVITY 73 15 SAFELY RECOMMANDATIONS anne aa on uen des dant ddr Dao dns 74 ID CONFORMITY ASSESSMENT ISSUES ane ER NRI ae a at ii xS E ERR UN GR COR PURI 75 16 1 1999 5 EC DIRECTIVE ne e ene Innen eeceeeeceneeeceneeeeceneeecenneeeceneeeeeneeeceneeeceneeeeeneeeceneeeceneeceeneeeceeneeecee 75 REG AT OR ei SN T 78 29 fe 2 no f Bi A I 4 5 Lot mil t r 2 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 6 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 1 Introduction 1 1 Scope The aim of this document is the description of some hardware solutions useful for developing a product with the Telit LE910 modul
65. stand the current peaks of 2A the suggested capacity is from 500mAh to 1000mAh L Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 31 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 5 3 2 Thermal Design Guidelines The thermal design for LE910 should be designed and tested in the following worse case conditions at nominal voltage 3 80V e Average current consumption during LTE TX PWR level max 780mA e Average current consumption during HSPA TX PWR level max 650mA e Average current consumption during class12 EGPRS TX PWR level max 680mA e n addition to one of the above current consumption GNSS current should be added 54 mA NOTE The LE910 includes a function to prevent overheating 5 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 and a protection diode on the input to protect the supply from spikes and polarity inversion The placement of these components 15 crucial for the correct working of the circuitry A misplaced component can be useless or can even decrease the power supply performances e The Bypass low ESR capacitor must be placed close to the Telit LE910 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 tr
66. t ISSUE 4 2014 10 10 Removed section 1 4 Document Organization Added Sensitivity values Updated Chapters 3 1 6 4 6 5 6 6 6 7 7 2 7 2 1 7 2 3 10 1 Updated GNSS specification ISSUE 3 2014 06 19 DG t d 4 2 2 J RE 4 y mda EVO me m 4 we Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 9 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 2 Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit LE910 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 LE910 module For further hardware details that may not be explained in this document refer to the Telit LE910 Product Description document where all the hardware information 15 reported NOTICE EN The inte
67. t Communications S p A 2G 3G LTE module nad 1999 5 Telit Communications S p A t mto prohla uje Ze tento 2G 3G LTE module je ve shod se z kladn mi po adavky dal mi p slu n mi ustanoven mi sm rnice 1999 5 ES Danish Undertegnede Telit Communications S p A erkl rer herved at f lgende udstyr nili 2G 3G LTE module overholder de vaesentlige krav og evrige relevante krav i direktiv 1999 5 EF Dutch Hierbij verklaart Telit Communications S p A dat het toestel 2G 3G LTE module in overeenstemming is met de essenti le eisen en de andere relevante bepalingen van richtlijn 1999 5 EG English Hereby Telit Communications S p A declares that this 2G 3G LTE module is in compliance with the essential requirements and other relevant provisions of Directive 1999 5 EC Estonian Kaesolevaga kinnitab Telit Communications S p A seadme 2G 3G LTE module vastavust direktiivi 1999 5 EU pohinouetele ja nimetatud direktiivist tulenevatele teistele asjakohastele s tetele German Hiermit erkl rt Telit Communications S p A dass sich das Ger t 2G 3G LTE module in Ubereinstimmung mit den grundlegenden Anforderungen und den brigen einschl gigen Bestimmungen der Richtlinie 1999 5 EG befindet Greek ME THN Telit Communications S p A OTI
68. t 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 co
69. t denna 2G 3G LTE module st r mul verensst mmelse med de v sentliga egenskapskrav och vriga relevanta bestammelser som framgar av direktiv 1999 5 EG In order to satisfy the essential requirements of 1999 5 EC Directive the LE910 EUG module 15 compliant with the following standards RF spectrum use R amp TTE art 3 2 EN 300 440 2 V1 4 1 EN 301 511 V9 0 2 EN 301 908 1 V6 2 1 EN 301 908 2 V5 4 1 BEEN EN 301 908 13 V5 2 1 EMC R amp TTE art 3 1b EN 301 489 1 V1 9 2 EN 301 489 3 V1 6 1 EN 301 489 7 V1 3 1 EN 301 489 24 V1 5 1 Health amp Safety R amp TTE art 3 1a EN 60950 1 2006 11 2009 1 2010 12 2011 AC 2011 EN 62311 2008 EN 62479 2010 me 1 7 gt Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 76 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 The conformity assessment procedure referred to in Article 10 and detailed in Annex IV of Directive 1999 5 EC has been followed with the involvement of the following Notified Body AT4 wireless S A Parque Tecnologico de Andaluc a C Severo Ochoa 2 29590 Campanillas M laga SPAIN Notified Body No 1909 Thus the following marking is included in the product C 1909 The full declaration of conformity can be found on the following address http www telit com There is no restriction for the commercialisation of the
70. tage Range can be used only with completely assumption and application of the HW User guide suggestions a x E X 3 E Y id nost 7 K NO ne lt Ya d a e L m e ki T z g 7 7 gt 6 4 H utt 2 2 e a B i P 4 E 4 Ae gt U a Sat z 2 TRES ec ae 22 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 26 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 0 2 Power Consumption LE910 current consumption Mode Average mA Mode description OER 68uA Module supplied but Switched Off IDLE mode GSM EDGE WCDMA 15 AT CFUN 1 GSM 19 Normal mode full functionality of the module LTE 20 AT CFEUN 4 12 Disabled TX and RX module is not registered on the network AT CFUN 5 E Full functionality with power saving Operative mode LTE LTE 0dBm 203 LTE data call channel BW 5MHz RB 1 TX 0dBm LTE 22dBm 540 LTE data call channel BW 5MHz RB 1 TX 22dBm Operative mode WCDMA WCDMA Voice 202 WCDMA voice call TX 9dBm WCDMA HSDPA 0dBm 137 WCDMA data call RMC TX OdBm WCDMA HSDPA 22dBm 443 WCDMA data call RMC TX 21dBm Operative mode EDGE EDGE 2TX 3RX LOW Band Gamma 7 218 EDGE Sending data mode High Band Gamma 6 185 Operative mode GSM GS
71. that could be used in Autonomous or in A GPS assisted GPS mode The LE910 module includes an embedded LNA 13 5dB gain typ with front end filter and inter stage filter in order to connect directly a passive antenna connected to ANT_GNSS pad In case of external antenna connection proper DC decoupling and ESD protection must be inserted to ANT_GNSS pad 7 1 Receiver Characteristics Cold Start Sensitivity 145 dBm Hot Start Sensitivity 156 dBm Tracking Sensibility 161 dBm Navigation Sensitivity 159 dBm TTFF Cold Start 31 5s TTFF Hot Start 138 Position Accuracy 0 4 m CEP 100 static scenario 130dBm hot start 7 2 GNSS Signals Pinout The Pads related to this function are the following PAD Signal T O Function Type R9 ANT_GNSS I GNSS Antenna 50 ohm RF R7 GNSS_LNA_EN O Output enable for External LNA supply CMOS 1 8V 2 2 P lt fe gt 22 f ZA LR 4 f 2 4 gt ae io Reproduction forbidden without Telit Communications S p A written authorization Rights Reserved page 44 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 7 3 GPS GLONASS Antenna Requirements GPS GLONASS ANTENNA REQUIREMENTS for LE910 1575 42 MHz 2MHz GPS 1598 0625 1607 0625 MHz GLONASS Average Gain over direction RHCP recommended Polarization Linear acceptable Avoid the use of LHCP antennas Impedance 50 ohm
72. ting down the device but only as an emergency exit in the rare case the device remains stuck waiting for some network response The HW SHUTDOWNY is internally controlled on start up to achieve always a proper power on reset sequence so there s no need to control this pin on start up It may only be used to reset a device already on that 15 not responding to any command NOTE Do not use this signal to power off the LE910 Use the ON OFF signal to perform this function or the AT SHDN command Unconditional Shutdown Signal Operating levels Signal Min Max cer 1 5V 2 1V Input high HW SHUTDOWN OV 0 5V Input low this signal 15 internally pulled up so the pin can be left floating if not used If unused this signal may be left unconnected 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 m Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 48 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 10 USB Port The LE910 module includes a Universal Serial Bus USB transceiver 2 0 which operates at USB high speed 480Mbits sec and is compatible with older USB full speed 12Mbits sec 10 1 USB 2 0 HS Description The following table 15 listing the available signals PAD Signal I O Function Type NOTE B15 USB USB
73. tional Shutdown Impulse GND For example l Let us assume you need to drive the HW SHUTDOWN pad with a totem pole output of a 3 5 V microcontroller uP OUT2 HW SHUTDOWN Q1 BC847TBW Dv Unconditional Shutdown Impulse GND p AS Ver T NATUS A Mj epa m v 4A gt amp NS aa gt P AL TET gt pn 4 Reproduction forbidden without Telit Communications S p A written authorization Rights Reserved page 23 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 The below flow chart is describing the HW Shutdown procedure HW SHUTDOWN Unconditional START HW_SHDN LOW Delay 1s Delay 200ms Disconnect HW SHDN HIGH VBATT PWRMON ON Y N HW SHUTDOWN Unconditional END gt l Aaa gt gt SF aed P Ma 8 LU a Sa ats D 54 3 eta gt 8 7 E A 4 T A hi Vm 274 DT ee png Mc f 4 s en without Telit Communications S p A written authorization All Rights Reserved page 24 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 4 9 Summary of Turning ON and OFF the module Below chart describes the overall sequences for Turning ON and OFF ON OFF Variable
74. traces connecting the Switching output to the inductor and the switching diode must be kept as short as possible by placing the inductor and the diode very close to the power switching IC only for switching power supply This is done in order to reduce the radiated field noise at the switching frequency 100 500 kHz usually e The use of a good common ground plane is suggested e 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 e The power supply input cables should be kept separate from noise sensitive lines such as microphone earphone cables e 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 BLMISEGIOITNI Taiyo Yuden P N FBMH1608HM101 can be used for this purpose gt be x ss _ fz 4 2 E j m I3 2 j 1 728 45 4 Ns y H i A 2 4 zi 45 t d G lt LES 4 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 33 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014
75. uR Un 20 BF OPO Eolo 21 4 4 LE910 UNCONDITIONAL SHUTDOWN 22 4 5 SUMMARY OF TURNING ON AND OFF THE MODULE ss ene eene emer esse esse sesse sese 25 5 POWER SUPPLY Sec cs 26 5 ITOWERSUPPBCREOUIREMENTS a uia morat bud 26 CONSOUNIPTION 27 BEE MIB e 28 2 98 EB To GIO ERR EDT TENE 28 332 Thermal DES NC aT mE 32 5 3 3 Power Supply PCB layout Guidelines serrer 32 6 GSM WCDMA LTE RADIO SECTION cccccosccscccsccscceccccccscceccecccscceccecccecceccecccsccecceccosccecceccsccecceccesccecceccesccecceccess 35 ETLESTIO PRODUCT VARIANTS dose i ce aser dendi tie tede xau t dave dva nella ce 35 ARS OP RET TT 35 RER TER 36 6 4 GSM WCDMA LTE ANTENNA REQUIREMENTS cseccccsececcescceccsceccesececasececaececnacececauceeeceececaunececauceeenescecautececsueceeaaeeees 37 6 5 GSM WCDMA LTE PCB LINE ressent 40 6 6 GSM WCDMA LTE ANTENNA INSTALLATION GUIDELINES
76. untries 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 e Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 3 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 Usage and Disclosure Restrictions License Agreements The software described in this document is the property of Telit and its licensors It 1s 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 No p
77. veloped for the US market and or Canada market it shall comply with the FCC and or IC approval requirements This device is to be used only for mobile and fixed application In order to re use the Telit FCC IC approvals the antenna s used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co located or operating in conjunction with any other antenna or transmitter If antenna 1s installed with a separation distance of less than 20 cm from all persons or is co located or operating in conjunction with any other antenna or transmitter then additional FCC IC testing may be required End Users must be provided with transmitter operation conditions for satisfying RF exposure compliance Antennas used for this OEM module must not exceed the gains for mobile and fixed operating configurations as described in Regulatory notices chapter H Ld sf m 4 l PF 7 f f Im Mi p mda Ev m 3 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 39 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 6 5 GSM WCDMA LTE PCB line Guidelines e Make sure that the transmission line s characteristic impedance is 50ohm e Keep line on the PCB as short as possible since the antenna line loss shall be less than a
78. ware User Guide AT SHDN e by tying low pin ON OFF for 2 second Either ways the LE910 issues a detach request to network and saves all parameters in the internal memory and in the simcard 4 3 1 Shutdown by Software Command LE910 can be shut down using the AT SHDN command When a shutdown command is sent LE910 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 LE910 is so it cannot be fixed definitely Normally it will be above 15 seconds later from sending a shutdown command and DTE should monitor the status of PWRMON to see the actual power off VBATTERY monitoring PINRMONH status PWRMON ta Variable Above 15660 TIP To check if the device has been powered off the hardware line PWRMON must be monitored The device is powered off when PWRMON goes low 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 LE910 when the module is powered off or during an ON OFF transition Aa 2 2 2 E NE 4 f f d 4 1 j Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 20 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 4 3 2 Hardware Shutdown To tu
79. wireless solutions Teli LE910 Hardware User Guide 1vv03701089 4 10 10 2014 LO and Ho ee 4 B a Er P D oa A Making machines talk wireless solutions LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 Applicability Table p All Rights Reserved page 2 of 80 lelit LE910 Hardware User Guide 1vv0301089 Rev 4 10 10 2014 SPECIFICATIONS 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 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 15 possible that this publication may contain references to or information about Telit products machines and programs programming or services that are no

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