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Telit Wireless Solutions LM940, Design Manual

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LM940 Hardware Design Guide

 

 

 
 
1VV0301352  Rev. 18  

Page 50 of 75 

2022-01-04 

Not Subject to NDA 

7.

 

RF SECTION 

 

Antenna Requirements 

The antenna connection is one of the most important aspect in the full product design as 
it  strongly  affects  the  product  overall  performance.  Hence  please  read  carefully  and 
follow the requirements and the guidelines for a proper design. 

The LM940 is provided with three RF connectors. 

The available connectors are: 

•

 

Main RF antenna: TX/RX path 

•

 

Auxiliary RF antenna: Combined Diversity and GNSS 

•

 

GNSS RF antenna: Dedicated GNSS 

 

Main Antenna Requirements 

The antenna for the LM940 device must meet the following requirements: 

Item 

Value 

Frequency range 

Depending on frequency band(s) supported by the network operator, 
the customer shall use the most suitable antenna for that/those 
band(s)  
The bands supported by the LM940 is provided in section 2.2 Product 
Variants and Frequency Bands. 

Impedance 

50 Ohm 

Input power 

> 24 dBm average power in WCDMA and LTE 

VSWR absolute max 

<= 10:1 

VSWR recommended 

<= 2:1 

Table 34: WCDMA / LTE Antenna Requirements 

 

Antenna Diversity Requirements 

This product includes an input for a second Rx antenna to improve radio sensitivity. The 
function is called Antenna Diversity. 

Item 

Value 

Frequency range 

Depending on frequency band(s) supported by the network operator, 
the customer shall use the most suitable antenna for that/those 
band(s)  
 The bands supported by the LM940 is provided in section 2.2 Product 
Variants and Frequency Bands. 

Impedance 

50

Ω

 

Summary of Contents for LM940

Page 1: ...LM940 HW Design Guide 1VV0301352 Rev 18 2022 01 04 Telit Technical Documentation ...

Page 2: ...to NDA APPLICABILITY TABLE PRODUCTS LM940 1 0 LM940 2 0 Note The main difference between LM940 HW Versions 1 0 and 2 0 is the pin out The two versions are slightly different in terms of POWER ON OFF control For more details refer to the chapter 3 Pins Allocation and 6 Digital Section ...

Page 3: ...Variant 11 2 2 1 1 Generic Image Frequency Bands and CA Combinations 11 2 2 1 2 AT and T Image Frequency Bands and CA Combinations 12 2 2 1 3 Verizon Image Frequency Bands and CA Combinations 12 2 2 1 4 Sprint Image Frequency Bands and CA Combinations 12 Target Market 13 Main Features 13 Block Diagram 14 TX Output Power 14 RX Sensitivity 15 GNSS Receiver Specifications 15 Mechanical Specifications...

Page 4: ...gn Guidelines 27 4 3 3 Power Supply PCB Layout Guidelines 28 RTC 29 Reference Voltage 29 Internal LDO for GNSS Bias 30 5 ELECTRICAL SPECIFICATIONS 31 Absolute Maximum Ratings Not Operational 31 Recommended Operating Conditions 31 6 DIGITAL SECTION 32 Logic Levels 32 6 1 1 1 8V Pins Absolute Maximum Ratings 32 6 1 2 1 8V Standard GPIOs 32 6 1 3 1 8V SIM Card Pins 33 6 1 4 2 85V Pins Absolute Maximu...

Page 5: ...tic Example 45 6 6 3 Control Signals 46 6 6 3 1 W_DISABLE_N 46 6 6 3 2 WAN_LED_N 46 6 6 4 General Purpose I O 47 6 6 4 1 Using a GPIO Pin as Input 47 6 6 4 2 Using a GPIO Pin as Output 48 6 6 4 3 Dedicated I O 48 6 6 5 I2C Inter Integrated Circuit 49 Using the Temperature Monitor Function 49 7 RF SECTION 50 Antenna Requirements 50 Main Antenna Requirements 50 Antenna Diversity Requirements 50 GNSS...

Page 6: ... 1 RED Declaration of Conformity 61 FCC Certificates 61 IC Certificates 61 FCC IC Regulatory Notices 61 RED Regulatory Notices 64 12 REFERENCE TABLE OF RF BANDS CHARACTERISTICS 66 13 PRODUCT AND SAFETY INFORMATION 68 Copyrights and Other Notices 68 13 1 1 Copyrights 68 13 1 2 Computer Software Copyrights 68 Usage and Disclosure Restrictions 69 13 2 1 License Agreements 69 13 2 2 Copyrighted Materi...

Page 7: ...LM940 Hardware Design Guide 1VV0301352 Rev 18 Page 7 of 75 2022 01 04 Not Subject to NDA 15 DOCUMENT HISTORY 73 ...

Page 8: ...common errors to be avoided are pointed out Obviously this document cannot embrace every hardware solution or every product that can be designed Where the suggested hardware configurations need not be considered mandatory the information given should be used as a guide and a starting point for properly developing a product using the Telit LM940 module Note The integration of the WCDMA HSPA LTE LM9...

Page 9: ... For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit https www telit com Our aim is to make this guide as helpful as possible Keep us informed of your comments and suggestions for improvements Telit appreciates the user feedback on our information ...

Page 10: ...hat may be useful when integrating the module Electro static Discharge Notifies the user to take proper grounding precautions before handling the product Table 1 Symbol Conventions All dates are in ISO 8601 format that is YYYY MM DD Related Documents LM940 SW User Guide 1VV0301343 LM940 AT Commands Reference Guide 80545ST10791A Generic EVB HW User Guide 1VV0301249 LM940 Interface Board HW User Gui...

Page 11: ...e in hardware variants as listed in Applicability Table The designated RF band sets for each variant are detailed in section 2 2 Product Variants and Frequency Bands Product Variants and Frequency Bands The operating frequencies in LTE and WCDMA modes conform to the 3GPP specifications 2 2 1 RF Bands per Regional Variant Table 2 summarizes the LM940 showing the supported band sets and the supporte...

Page 12: ... 3CA CA_2A_2A_5A CA_2A_2A_12A CA_2A_4A_5A CA_2A_4A_12A CA_2A_5A_30A CA_2A_5A_66A CA_2A_12A_30A CA_2A_12A_66A CA_ 2A_29A_30A CA_4A_4A_5A CA_4A_4A_12A CA_4A_5A_30A 4A_12B CA_4A_12A_30A CA_4A_29A_30A CA_5A_30A_66A CA_5A_66A_66A CA_5A_66C CA_12A_30A_66A CA_12A_66A_66A Table 3 AT and T Image Frequency Bands 2 2 1 3 Verizon Image Frequency Bands and CA Combinations LTE FDD LTE TDD HSPA Bands 2 4 5 13 66...

Page 13: ... to DC HSPA Rel 9 Support for GPS GLONASS BeiDou Galileo Two USIM ports dual voltage Support of two SIM interfaces Class B and Class C support Clock rates up to 4 MHz Interfaces Rich set of interfaces including USB2 0 USB3 0 USB port is typically used for o Flashing of firmware and module configuration o Production testing o Accessing the Application Processor s file system o AT command access o H...

Page 14: ...tecture of the LM940 module Figure 1 LM940 Block Diagram It includes the following sub functions Application processor Module subsystem and Location processing with their external interfaces These three functions are contained in a single SOC RF front end Rich IO interfaces Depending on which LM940 software features are enabled some of its interfaces that are exported through multiplexing may be u...

Page 15: ...B17 LTE FDD B20 LTE FDD B25 LTE FDD B26 LTE FDD B28 LTE FDD B66 LTE TDD B38 LTE TDD B40 LTE TDD B41 101 5 101 0 101 5 101 0 102 5 99 5 102 5 102 0 102 0 102 0 102 0 101 0 102 0 102 0 101 0 100 0 100 0 99 5 LM940 WCDMA FDD B1 WCDMA FDD B2 WCDMA FDD B4 WCDMA FDD B5 WCDMA FDD B8 108 5 108 5 108 5 109 5 109 5 Note LTE Rx Sensitivity shall be verified by using both all antenna ports simultaneously 3 3 ...

Page 16: ...n tracking sensitivity performance figures assume an open sky with an active patch GPS antenna and a 2 5 dB noise figure Accuracy in open sky 2m CEP 50 Open sky 1Hz tracking Standalone time to first fix TTFF hot warm cold 1s 29s 32s Total number of SVs available 55 SVs Table 10 GNSS Receiver Specifications Mechanical Specifications 2 9 1 Dimensions The LM940 module s overall dimensions are Length ...

Page 17: ...performance deviations in this extended range relative to 3GPP requirements which means that some RF parameters may deviate from the 3GPP specification in the order of a few dB For example receiver sensitivity or maximum output power may be slightly degraded Even so all the functionalities such as call connection SMS USB communication UART activation etc will be maintained and the effect of such d...

Page 18: ...og USB SS 3 0 Communication Port 25 USB_SS_TX_P O USB 3 0 super speed transmit plus Analog 23 USB_SS_TX_M O USB 3 0 super speed transmit minus Analog 33 USB_SS_RX_P I USB 3 0 super speed receive plus Analog 31 USB_SS_RX_M I USB 3 0 super speed receive minus Analog SIM Card Interface 1 8 SIMVCC1 O Supply output for an external UIM1 card 1 8V 2 85V Power 10 SIMIO1 I O Data connection with an externa...

Page 19: ...1 8V Pull up 45 GPIO_05 I O General purpose I O 1 8V 47 GPIO_06 I O General purpose I O 1 8V 49 GPIO_07 I O General purpose I O 1 8V 51 GPIO_08 I O General purpose I O 1 8V Control Signal 1 PCIE_WAKE_N O PCIe wake up 1 8V 20 W_DISABLE_N I RF disable Power ON Trigger Open drain Internal VBATT Pull up 42 WAN_LED_N O LED control Open drain Miscellaneous Functions 11 VREG_L6_1P8 O Reference Voltage 1 ...

Page 20: ...nd Ground 35 GND Ground Ground 37 GND Ground Ground 40 GND Ground Ground 43 GND Ground Ground 50 GND Ground Ground Reserved 6 Reserved Reserved NC 16 Reserved Reserved NC 28 Reserved Reserved NC 48 Reserved Reserved NC Table 12 LM940 1 0 Pin out Information 3 1 2 LM940 2 0 Pin Out Pin Signal I O Function Type Comment USB HS 2 0 Communication Port 38 USB_D I O USB 2 0 Data Plus Analog 36 USB_D I O ...

Page 21: ... Card Interface 2 16 SIMVCC2 O Supply output for an external UIM2 card 1 8 2 85V Power 19 SIMIO2 I O Data connection with an external UIM2 card 1 8 2 85V 17 SIMCLK2 O Clock output to an external UIM2 card 1 8 2 85V 6 SIMRST2 O Reset output to an external UIM2 card 1 8 2 85V Digital I O GPIOs 3 GPIO_01 I O General purpose I O Can be used as SIMIN1 1 8V 5 GPIO_02 I O General purpose I O Can be used ...

Page 22: ..._SCL O I2C Clock 1 8V 32 I2C_SDA I O I2C Data 1 8V Power Supply 2 VBATT I Power supply Power 24 VBATT I Power supply Power 39 VBATT I Power supply Power 41 VBATT I Power supply Power 52 VBATT I Power supply Power Ground 4 GND Ground Ground 9 GND Ground Ground 15 GND Ground Ground 18 GND Ground Ground 21 GND Ground Ground 26 GND Ground Ground 27 GND Ground Ground 29 GND Ground Ground 34 GND Ground ...

Page 23: ...e signals can be left floating Note Unless otherwise specified RESERVED pins must be left unconnected Floating LM940 Signals That Must Be Connected Below table specifies the LM940 signals that must be connected for debugging purposes even if not used by the end application Pin Signal Notes 2 24 39 41 52 VBATT 4 9 15 18 21 26 27 29 34 35 37 40 43 50 GND 38 USB_D If not used connect to a test point ...

Page 24: ...Subject to NDA Pin Layout Note The only difference between LM940 1 0 and LM940 2 0 is the pin out Pins highlighted in Blue show that these pins are assigned differently to LM940 1 0 and LM940 2 0 Otherwise they support same features and functions Figure 2 LM940 1 0 Pin Layout ...

Page 25: ...LM940 Hardware Design Guide 1VV0301352 Rev 18 Page 25 of 75 2022 01 04 Not Subject to NDA Figure 3 LM940 2 0 Pin Layout ...

Page 26: ... mV Table 15 Power Supply Requirements Power Consumption Below table provides typical current consumption values of LM940 for various operation modes Mode Average Typ Mode Description IDLE Mode IDLE Mode 60 0 mA No call connection USB3 0 is connected to a host Operative Mode LTE LTE 22 dBm 750 mA 750 mA 1250 mA LTE data call CA_3A 7A 20A 20MHz 20MHz 20MHz Full RB 256QAM DL 64QAM UL FDD 600Mbps DL ...

Page 27: ...large a linear regulator can be used A switching power supply is preferred to reduce power consumption When using a linear regulator a proper heat sink must be provided to dissipate the heat generated A bypass low ESR capacitor of adequate capacity must be provided to cut the current absorption peaks close to the LM940 module A 100 μF tantalum capacitor is usually suitable on VBATT Verify the low ...

Page 28: ... While designing the application board the designer must make sure that the LM940 module is located on a large ground area of the application board for effective heat dissipation Note The LM940 must be connected to the ground and metal chassis of the host board for best RF performance and thermal dispersion as well as to have module fixed The two holes at the top of the module and the main ground ...

Page 29: ...The PCB 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 the switching power supply This is done to reduce the radiated field noise at the switching frequency usually 100 500 kHz Use a good common ground plane Place the power supply on the board in a w...

Page 30: ... 8V Table 17 LM940 VREG_l6_IP8 Signal Internal LDO for GNSS Bias The LDO for GNSS bias is applied inside the LM940 model The voltage supply come from LM940 s LDO to GNSS active antenna This table lists the LDO for GNSS bias of LM940 LM940 Reference Voltage Symbol Parameter Min Typ Max Unit VGNSS DC bias Voltage of Internal LDO for GNSS bias 2 9 3 1 3 3 V IGNSS DC bias Current of Internal LDO for G...

Page 31: ... module Symbol Parameter Min Max Unit VBATT Battery supply voltage on pin VBATT 0 5 4 V Table 19 Battery Supply Voltage on Pin VBATT Recommended Operating Conditions Symbol Parameter Min Typ Max Unit Tamb Ambient temperature 40 25 85 C VBATT Battery supply voltage on pin VBATT 3 1 3 3 3 6 V IVBATT Peak current to be used to dimension decoupling capacitors on pin VBATT 80 2500 mA IVBATT_PA Table 20...

Page 32: ...gher than 2 3V for 1 8V CMOS signals 6 1 1 1 8V Pins Absolute Maximum Ratings Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any digital pin when on 2 16V Input voltage on analog pins when on 2 16 V Table 21 Absolute Maximum Ratings 1 8V Pins 6 1 2 1 8V Standard GPIOs Parameter Min Max Unit Comment VIH Input high level 1 17V 2 1V V VIL Input low level 0 3V 0 63V V VOH Out...

Page 33: ... Maximum Ratings Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any digital pin when on 3 42V Input voltage on analog pins when on 3 42 V Table 24 Absolute Maximum Ratings 2 85V Pins 6 1 5 SIM Card Pins 2 85V Parameter Min Max Unit Comment VIH Input high level 1 995V 3 15V V VIL Input low level 0 3V 0 57V V VOH Output high level 2 28V 2 85V V VOL Output low level 0V 0 4V ...

Page 34: ...hase Boot OK Shutdown Indicator goes high at the time of AT command is available via USB But this does not mean that it works fully As soon as the AT command interface is accessible via USB port Boot OK line transitions to high but this does not imply that the device is fully operational yet One of GPIO pins can be configured as Shutdown indicator by means of AT SHDNIND command in that case that G...

Page 35: ...eled with a name that ends with _N Note To avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the module when it is powered OFF or during an ON OFF transition Power Off Power off the device can be done in three different ways Graceful Shutdown by USB AT command AT SHDN Fast Shutdown by GPIO triggered or USB AT command AT FASTSH...

Page 36: ...by AT Command The DTE should monitor the status of Shutdown Indicator to proceed graceful power off Note VBATT must not be removed before Shutdown Indicator goes LOW Warning Not following the recommended shut down procedures might damage the device and consequently void the warranty 6 3 2 Fast Shutdown For a quicker shutdown of the LM940 module the host can use the fast shutdown function Fast shut...

Page 37: ... LOW Warning Not following the recommended shut down procedures might damage the device and consequently void the warranty 6 3 2 2 Fast Shutdown by GPIO If properly configured one of GPIO lines can be used as Fast Shutdown Trigger Once the Fast Shutdown Trigger senses a HIGH to LOW transition fast shutdown is initiated Then the LM940 module enters finalization state terminates active processes and...

Page 38: ...ional hardware shutdown To turn off the module SYSTEM_RESET_N pad must be asserted low more than 1 seconds and then it should be kept low When the SYSTEM_RESET_N is asserted low more than 1 second the LM940 enters finalization state and after the end of the shutdown process Shutdown Indicator will go to low Usually it takes the LM940 less than 100 milliseconds from asserting SYSTEM_RESET_N until r...

Page 39: ...owered OFF or during an ON OFF transition Warning Not following the recommended shut down procedures might damage the device and consequently void the warranty Figure 8 Shutdown by SYSTEM_RESET_N Pad Below figure shows a simple circuit for this action Figure 9 Circuit for Shutdown by SYSTEM_RESET_N Reset Reset the device can be done in two different ways Graceful Reset by USB AT command AT REBOOT ...

Page 40: ...mmunication Figure 10 Graceful Reset by AT REBOOT 6 4 2 Unconditional Hardware Reset To unconditionally restart the LM940 module the SYSTEM_RESET_N pin must be asserted low more than 1 seconds and then released Figure 11 Unconditional Hardware Reset by SYSTEM_RESET_N Pad Note The Unconditional Hardware Reset must be used only as an emergency exit procedure and not as a normal power off operation ...

Page 41: ...y notifying the LM940 module One of GPIOs can be configured as Dying Gasp Trigger by means of AT commands Once the Dying Gasp Trigger receives a HIGH to LOW transition the dying gasp procedure is triggered the LM460 will send the specified SMS and then initiate fast shutdown Figure 12 Dying Gasp by GPIO Max Power Non CA Current 500mA 3 3V Usually dying gasp feature is completed less than 1 second ...

Page 42: ...ing and firmware update The USB port is typically the main interface between the LM940 module and OEM hardware USB 3 0 needs capacitors on the TX lines in both directions for AC coupling To interface USB3 0 with an application board of customer 0 1uF capacitors should be installed on USB_SS_RX_P M lines of the LM940 There are already capacitors on USB_SS_TX_P M lines inside LM940 module The sugges...

Page 43: ... Analog 31 USB_SS_RX_M I USB 3 0 super speed receive minus Analog 25 USB_SS_TX_P O USB 3 0 super speed transmit plus Analog 23 USB_SS_TX_M O USB 3 0 super speed transmit minus Analog Table 27 USB Interface Signals Note Even if USB communication is not used it is still highly recommended to place an optional USB connector on the application board At least test points of the USB signals are required...

Page 44: ... different SIM2 pinout Below table lists the SIM interface signals Pin Signal I O Function Type Comment SIM Card Interface 1 8 SIMVCC1 O Supply output for an external UIM1 card 1 8V 2 85V Power 10 SIMIO1 I O Data connection with an external UIM1 card 1 8V 2 85V 12 SIMCLK1 O Clock output to an external UIM1 card 1 8V 2 85V 14 SIMRST1 O Reset output to an external UIM1 card 1 8V 2 85V SIM Card Inter...

Page 45: ...ata connection with an external UIM2 card 1 8 2 85V 17 SIMCLK2 O Clock output to an external UIM2 card 1 8 2 85V 6 SIMRST2 O Reset output to an external UIM2 card 1 8 2 85V Digital I O GPIOs 3 GPIO_01 I UIM1 Card Present Detect 1 8V GPIO_01 can be used as SIMIN1 5 GPIO_02 I UIM2 Card Present Detect 1 8V GPIO_02 can be used as SIMIN2 Table 28 SIM Interface Signals 6 6 2 1 SIM Schematic Example The ...

Page 46: ...rmal operating mode High or Leave the W_DISABLE_N not connected LM940 contains an internal VBATT Nominal 3 3V pull up resistor on W_DISABLE_N 6 6 3 2 WAN_LED_N The WAN_LED_N signal drives the LED output The recommended WAN_LED_N connection is the following Figure 17 Recommended WAN_LED_N Connection R1 and VDD determine the brightness of LED and forward current When VDD is 3 3V and LED s forward vo...

Page 47: ...V 2 16 mA 5 GPIO_02 I O Configurable GPIO Pull Down 1 8V 2 16 mA 44 GPIO_03 I O Configurable GPIO Pull Down 1 8V 2 16 mA 46 GPIO_04 I O Configurable GPIO Pull Up 1 8V 2 16 mA 45 GPIO_05 I O Configurable GPIO Pull Down 1 8V 2 16 mA 47 GPIO_06 I O Configurable GPIO Pull Down 1 8V 2 16 mA 49 GPIO_07 I O Configurable GPIO Pull Down 1 8V 2 16 mA 51 GPIO_08 I O Configurable GPIO Pull Down 1 8V 2 16 mA T...

Page 48: ... Dedicated I O To use SIMIN functions host must use GPIO_01 GPIO_02 Pin Signal IO Level Dedicated Function 3 GPIO_01 Input 1 8V Can be used as SIMIN1 function 5 GPIO_02 Input 1 8V Can be used as SIMIN2 function Table 31 Dedicated I O Below functions are not dedicated to specific GPIO Customer use one of GPIOs GPIO_03 to GPIO_08 as these functions by AT command Boot OK Shutdown Indicator Shutdown T...

Page 49: ...al I O Function Type Comment 30 I2C_SCL O I2C Clock CMOS 1 8V 32 I2C_SDA I O I2C Data CMOS 1 8V Table 33 LM940 Module I2C Signal The I2C interface is used for controlling peripherals inside the module such as codec etc Note I2C is supported only on from Modem side as SW emulation of I2C on GPIO lines Please contact Telit Customer support if you use it Note If the I2C interface is not used the sign...

Page 50: ... Item Value Frequency range Depending on frequency band s supported by the network operator the customer shall use the most suitable antenna for that those band s The bands supported by the LM940 is provided in section 2 2 Product Variants and Frequency Bands Impedance 50 Ohm Input power 24 dBm average power in WCDMA and LTE VSWR absolute max 10 1 VSWR recommended 2 1 Table 34 WCDMA LTE Antenna Re...

Page 51: ...orrelation 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 GNSS Receiver The LM940 integrates a GNSS receiver that could be used in Standalone mode and in A GPS assisted GPS according to the different configurations LM940 supports an active antenna Item Value Frequency range Wide band GNSS 1560 ...

Page 52: ...e path uses either the dedicated GNSS connector or the shared AUX connector Note Please refer to the LM940 AT Commands Reference Guide 80545ST10791A for detailed information about GNSS operating modes and GNSS Antenna selection Antenna Connection 7 5 1 Antenna Connector The LM940 is equipped with a set of 50 Ω RF U FL connectors from Hirose U FL R SMT 1 10 The available connectors are Main RF ante...

Page 53: ...Antenna Cable Connecting cables between the module and the antenna must have 50 Ω impedance If the impedance of the module is mismatched RF performance is reduced significantly If the host device is not designed to use the module s diversity or GNSS antenna terminate the interface with a 50Ω load Item Value Impedance 50 Ohm Max cable loss 0 5 dB Note Avoid coupling with other signals Table 37 Mini...

Page 54: ... in conjunction with any other antenna or transmitter End Users must be provided with transmitter operation conditions for satisfying RF exposure compliance OEM integrators must ensure that the end user has no manual instructions to remove or install the LM940 module Antennas used for this OEM module must not exceed gain of below table for mobile and fixed operating configurations If these conditi...

Page 55: ...N General The LM940 module was designed to be compliant with a standard lead free SMT process Moreover it is compatible with the Mini PCIe card 52 pin card edge type connector Finishing and Dimensions N A Drawing Figure 20 shows the mechanical dimensions of the LM940 module Figure 20 Mechanical Design Drawing ...

Page 56: ...O_02 GPIO_03 GPIO_04 GPIO_05 GPIO_06 GPIO_07 GPIO_08 Bypass Capacitor on Power Supplies When a sudden voltage step is asserted to or a cut from the power supplies the steep transition causes some reactions such as overshoot and undershoot This abrupt voltage transition can affect the device causing it to not operate or to malfunction Bypass capacitors are needed to alleviate this behavior The beha...

Page 57: ...ata Minus Analog USB SS 3 0 Communication Port 33 USB_SS_RX_P I USB 3 0 super speed receive plus Analog 31 USB_SS_RX_M I USB 3 0 super speed receive minus Analog 25 USB_SS_TX_P O USB 3 0 super speed transmit plus Analog 23 USB_SS_TX_M O USB 3 0 super speed transmit minus Analog SIM Card Interface 1 14 SIMRST1 O Reset output to an external UIM1 card 1 8 2 85V 12 SIMCLK1 O Clock output to an externa...

Page 58: ...and RF ON OFF Control 1 8V Active Low SYSTEM_RESET_N I Reset Input 1 8V Active Low See note 1 8V Voltage Regulator VREG_L6_1P8 O LDO out for 1 8V Power See note Note SIMRST2 SIMVCC2 SYSTEM_RESET_N VREG_L6_1P8 are assigned differently to LM940 1 0 and 2 0 For more details refer to the chapter 3 Pins Allocation Table 38 EMC Recommendations All other pins have the following characteristics Human Body...

Page 59: ...VV0301352 Rev 18 Page 59 of 75 2022 01 04 Not Subject to NDA 10 PACKAGING Tray The LM940 modules are packaged on trays of 20 pieces each These trays can be used in SMT processes for pick and place handling Figure 21 Tray Packaging ...

Page 60: ...LM940 Hardware Design Guide 1VV0301352 Rev 18 Page 60 of 75 2022 01 04 Not Subject to NDA ...

Page 61: ...ull text of the EU declaration of conformity is available at the following internet address https www telit com red Text of 2014 53 EU Directive RED can be found here https eur lex europa eu legal content EN TXT uri CELEX 32014L0053 FCC Certificates The FCC Certificate is available here www fcc gov oet ea fccid IC Certificates The IC Certificate is available here https sms sgs ic gc ca equipmentSe...

Page 62: ...pas produire de brouillage et 2 l utilisateur de l appareil doit accepter tout brouillage radioélectrique subi même si le brouillage est susceptible d en compromettre le fonctionnement RF exposure This equipment complies with FCC and ISED radiation exposure limits set forth for an uncontrolled environment The antenna should be installed and operated with minimum distance of 20 cm between the radia...

Page 63: ...rt 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 p...

Page 64: ...u mot Contient ou d une formulation similaire exprimant le même sens comme suit LM940 Contains FCC ID RI7LM940 Contains IC 5131A LM940 CAN ICES 3 B NMB 3 B This Class B digital apparatus complies with Canadian ICES 003 Cet appareil numérique de classe B est conforme à la norme canadienne ICES 003 RED Regulatory Notices RF Exposure Information MPE This device has been tested and meets applicable li...

Page 65: ...m together with this module or above restrictions cannot be kept a separate RF exposure assessment and CE equipment certification is required WCDMA LTE Antenna Brand HNS HANKOOK Network Solution Model Number WE14 LF 07 Type Dipole Antenna Mode Band Antenna Gain dBi LTE FDD 2100 B1 FDD 1800 B3 FDD 2600 B7 FDD 900 B8 FDD 800 B20 FDD 700 APT B28 TDD 2600 B38 TDD 2300 B40 3 5 3 5 4 0 3 0 3 0 3 0 4 0 4...

Page 66: ...Tx 18600 19199 Rx 600 1199 80 MHz LTE 1800 B3 1710 1785 1805 1880 Tx 19200 19949 Rx 1200 1949 95 MHz LTE AWS 1 B4 1710 1755 2110 2155 Tx 19950 20399 Rx 1950 2399 400 MHz LTE 850 B5 824 849 869 894 Tx 20400 20649 Rx 2400 2649 45 MHz LTE 2600 B7 2500 2570 2620 2690 Tx 20750 21449 Rx 2750 3449 120 MHz LTE 900 B8 880 915 925 960 Tx 21450 21799 Rx 3450 3799 45 MHz LTE 700a B12 699 716 729 746 Tx 23010 ...

Page 67: ...0 39649 0 MHz LTE TDD 2500 B41 2496 2690 2496 2690 Tx 39650 41589 Rx 39650 41589 0 MHz Table 41 RF Bands Characteristics Note The channel numbers that designate carrier frequencies so close to the operating band edges that the carrier extends beyond the operating band edge shall not be used This implies that the first 7 15 25 50 75 and 100 channel numbers at the lower operating band edge and the l...

Page 68: ...necessarily mean that Telit intends to announce such Telit products programming or services in your country 13 1 1 Copyrights This instruction manual and the Telit products described herein may include or describe Telit copyrighted material such as computer programs stored in semiconductor memories or other media The laws in Italy and in other countries reserve to Telit and its licensors certain e...

Page 69: ...s document is owned by Telit and its licensors It is furnished by express license agreement only and shall be used exclusively in accordance with the terms of such agreement 13 2 2 Copyrighted Materials The Software and the documentation are copyrighted materials Making unauthorized copies is prohibited by the law The software or the documentation shall not be reproduced transmitted transcribed ev...

Page 70: ...OR A PARTICULAR PURPOSE NO THIRD PARTY LICENSORS OF OTHER CODES MUST BE LIABLE FOR ANY DIRECT INDIRECT INCIDENTAL SPECIAL EXEMPLARY OR CONSEQUENTIAL DAMAGES INCLUDING WITHOUT LIMITATION LOST OF PROFITS HOWEVER CAUSED AND WHETHER MADE UNDER CONTRACT TORT OR OTHER LEGAL THEORY ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE OTHER CODES OR THE EXERCISE OF ANY RIGHTS GRANTED UNDER EITHER OR B...

Page 71: ...truction for its use Do not insert or remove the SIM when the product is in power saving mode The system integrator is responsible for the functioning of the final product Therefore the external components of the module as well as any project or installation issue have to be handled with care Any interference may cause the risk of disturbing the GSM network or external devices or having an impact ...

Page 72: ...O General Purpose Input Output HS High Speed HSDPA High Speed Downlink Packet Access HSUPA High Speed Uplink Packet Access I O Input Output I2C Inter integrated circuit LTE Long term evolution PCB Printed Circuit Board RTC Real Time Clock SIM Subscriber Identification Module SOC System on Chip USB Universal Serial Bus UART Universal Asynchronous Receiver Transmitter VSWR Voltage Standing Wave Radi...

Page 73: ...Sensitivity Level corrected 12 2019 07 18 Band and CA combinations tables updated 11 2019 06 14 Moisture Sensitivity Level paragraph added 10 2019 05 28 Editorial changes 9 2019 05 28 Deleted some sentence in 2 1 Overview Deleted some words in 2 4 Main features Updated 6 3 2 Fast Shutdown Timing 8 2019 03 15 6 Digital Section Changed description about setting GPIO as specific function Updated 6 2 ...

Page 74: ...ds Characteristics Added 6 3 Added Warning 4 2017 11 01 Added 2 8 GNSS Receiver Specifications Updated 2 2 1 RF bands per Regional Variant Updated 8 3 Drawing Updated 13 RF bands Characteristics 3 2017 08 17 Updated 11 1 Approvals Updated 11 5 RF exposure Added 11 6 RED Regulatory Notices Updated 12 Safety Recommendations 2 2017 07 19 Updated 7 RF section Updated 11 5 RF exposure 1 2017 06 23 Chan...

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