Janus LTE910CF User Manual

LTE910CF v15.00 CAT1 Embedded Cellular Modem User Manual

Bulletin

JA03-UM-LTE910CF v15

Revision

Date

00

05 Nov 2020

TABLE OF CONTENTS

TABLE OF CONTENTS and DISCLAIMER .............................................................................................................................. 2

1 APPLICABILITY TABLE ........................................................................................................................................................ 3

2 REFERENCES ...................................................................................................................................................................... 3

2.1 Janus Document List ............................................................................................................................................... 3

2.2 Telit Document List .................................................................................................................................................. 3

3 OVERVIEW ........................................................................................................................................................................ 4-6

3.1 Introduction ............................................................................................................................................................. 4

3.2 Preview .................................................................................................................................................................... 4

3.3 Features ................................................................................................................................................................... 5

3.4 Block Diagram ......................................................................................................................................................... 5

3.5 FOTA Notice ............................................................................................................................................................ 6

4 INTERFACES ................................................................................................................................................................... 6-14

4.1 Inerface Voltage Selection ....................................................................................................................................... 6

4.2 Serial Interface......................................................................................................................................................7-8

4.3 Power Supply .......................................................................................................................................................... 9

4.4 Audio Interface ........................................................................................................................................................ 9

4.5 Pin-Out .................................................................................................................................................................. 10

4.6 VRTC ..................................................................................................................................................................... 11

4.7 GPIO .................................................................................................................................................................11-12

4.8 Analog to Digital Converter ................................................................................................................................... 12

4.9 Internal Interfaces .............................................................................................................................................12-14

4.10 RF Interface ........................................................................................................................................................... 14

4.11 SIM Card Interface ................................................................................................................................................ 14

4.12 Header Interface Mounting Options ...................................................................................................................... 14

4.13 Screw Mounting .................................................................................................................................................... 14

5 LTE910CF TECHNICAL SPECIFICATIONS ................................................................................................................... 15-19

5.1 Electrical Speciﬁcations ...................................................................................................................................15-18

5.2 Mechanical Speciﬁcations..................................................................................................................................... 19

6 OPERATION .................................................................................................................................................................. 20-24

6.1 Powering ON/OFF ................................................................................................................................................. 20

6.2 Communicating with the Modem .......................................................................................................................... 20

6.3 Testing Communications ....................................................................................................................................... 20

6.4 Cellular Network Communications ................................................................................................................... 21-22

6.5 Data Communications ......................................................................................................................................22-23

6.6 SMS ....................................................................................................................................................................... 23

6.7 GNSS ..................................................................................................................................................................... 23

6.8 Firmware Selection ................................................................................................................................................ 24

7 DESIGN CONSIDERATIONS .............................................................................................................................................. 24

7.1 Minimum required Modem Pin-Connection .......................................................................................................... 24

7.2 Debug .................................................................................................................................................................... 24

APPENDICES ...................................................................................................................................................................25-26

Approvals .............................................................................................................................................................. 25

Antenna Care and Replacement ........................................................................................................................... 25

Abbreviations ......................................................................................................................................................... 25

Ordering Information ............................................................................................................................................. 26

Revision History..................................................................................................................................................... 26

DISCLAIMER

The information contained in this document is the proprietary information of Connor-Winﬁeld Corporation and its afﬁliates (Janus Remote Communication). The contents are conﬁdential and any disclosure

to persons other than the ofﬁcers, employees, agents or subcontractors of the owner or licensee of this document, without the prior written consent of Connor-Winﬁeld, is strictly prohibited. Connor-Winﬁeld makes every effort to ensure the quality of the information it makes available. Notwithstanding the foregoing, Connor-Winﬁeld does not make any warranty as to the information contained herein, and does not accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the information. Connor-Winﬁeld disclaims any and all responsibility for the application of the devices characterized in this document, and notes that the application of the device must comply with the safety standards of the applicable country, and where applicable, with the relevant wiring rules. ConnorWinﬁeld reserves the right to make modiﬁcations, additions and deletions to this document due to typographical errors, inaccurate information, or improvements to programs and/or equipment at any time and without notice. Such changes will, nevertheless be incorporated into new editions of this application note.

LTE910CF Hardware User Manual JA03-UM-LTE910CF v15.00-Cat 1 Page 2 Rev: 01 Date: 11/05/20

1 APPLICABILITY TABLE

Product Part Number

LTE910CF v15.00

2 REFERENCES

2.1 Janus Document List

Janus Application Note 117 - FOTA (Firmware Over The Air)

2.2 Telit Document List

Our modem uses Telit LE910C1-NF cellular module. Please refer to Telit’s website at www.telit.com for the latest information on the LE910C1 module family.

Telit LE910Cx AT Command Reference Telit LE910Cx Hardware Design Guide Telit IP Easy User Guide Telit Single SKU AT Command Application Note Telit LE910 / LE920 Digital Voice Interface Application Note

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3 OVERVIEW

3.1 Introduction

The User Manual for the Modem devices is intended to illustrate how users can integrate and implement the features of each communication version of the device. The common factors are explained in detail, as well as special considerations and diagrams for each Modem. The Modem differences are highlighted in this manual for design considerations for future model placement.

3.2 Preview

The Modems are self-contained, multi-band, globally capable, IoT and M2M communication devices designed to provide a comprehensive solution to application problems for our customers. They utilize the proven technology of Telit’s certiﬁed modules for their core communications engines.

3.2.1 Functional Description

Cellular

• LTE Cat1 / HSPA / UMTS

GNSS Functionality

• GPS, GLONASS, Beidou

UART

• 115200 bps default supporting all 7 standard RS232 signals

USB

• HS/FS USB 2.0 Device (480Mb/s)

Physical Dimensions

• Length and width of all devices are equal

• Heights of different devices will vary

.050

1.100

2.300

.100 TYP

.047 DIA (49)

PIN 26PIN 49

(TOP VIEW)

PIN 1 PIN 25

.100 TYP

2.400

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3 OVERVIEW continued

TELIT

LE910C1-NF

TELIT

LE910C1-NF

SIM CARD

Switching Regulator

LTE910CF V15.00

1.8V GPIO1/Cellular LED

USB

VSel UART (AT)

VSel UART (TRACE)

VSel GPIO (3-7)

5 VDC

ENABLE

1.8v PWRMON

RESET

ON/OFF

1.8V GPIO2/User LED

1.8v DVI

LDO

2.85v

Translator

1.8v UART (AT)

1.8v UART (TRACE)

1.8v PWRMON

VSel PWRMON

1.8v UART (AT)

1.8v UART (TRACE)

1.8v PWRMON

Enable

1.8v GPIO (3-7)

1.8v GPIO9

1.8v GPIO10

Reference

VL

2.85v

Vo

Select

Vo

Select

VSel VAUX

VSel

3.3 Features

LTE910CF v15.00

Multi-Band Support

• LTE Band 1900 (B2), 1700 (B4), 850 (B5), 700 (B12/B13/B14),

AWS-3 (B66), 600 (B71)

• UMTS/HSPA+ Band 1900 (B2), 1700 (B4), 850 (B5),

Output Power

• Class 3 (0.2W) @ LTE

• Class 3 (0.25W) @ WCDMA

Data

• LTE: DL: Up to 10Mbps, UL: Up to 5Mbps

• HSPA: DL: Up to 42Mbps, UL: Up to 5.76 Mbps

3.4 Block Diagram

Features

• Control via standard and extended AT command set

• SIM application Tool Kits 3GPP TS 51.014

• SIM access proﬁle

• IP stack with TCP/UDP protocol support

• SMS Support

• Through hole for screw mount

• Dimensions: 2.5” x 1.4” x 0.325”

• Operational Temperature Range: -40°C to 85°C

• Internal Switching Regulator:

Input Voltage Range: 4.75 to 5.25Vdc (5Vdc nominal) Supply disable via terminal input pin

• Variable logic level (UART/GPIO)

Adjustable from 1.8 - 5.0Vdc Defaults to 2.85v

• SIM Card:

Standard locking SIM card socket (2FF ‘mini’)

• GNSS (Globa Navigation Sattelite System) includes

GPS, GLONASS and Beidou

• Cellular, Rx Diversity, MIMO DL 2x2 and GPS

antenna connections via Hirose U.FL miniature RF connectors

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Figure 1 LTE910CF v15.00 Block Diagram

3 OVERVIEW continued

3.5 FOTA Notice

The certification of LTE devices for use on the Verizon Wireless network REQUIRES that the end user implement an automated FOTA procedure on their devices that would allow the cellular module firmware to be updated if required.

Failure to implement an automated FOTA procedure violates the certification requirements of the cellular modem and may result in units becoming unusable on the cellular network in the future. Your end device must support the firmware over the air update for the cellular modem

You may use your own FOTA system to update the cellular modem firmware over the air. You may also be able to use the Verizon Wireless FOTA system, and FOTA services may be available from other 3 party vendors.

To inquire about Verizon Wireless FOTA system information and technical specifications, contact

VZW.FOTA-Services@VerizonWireless.com

4 INTERFACES

4.1 Interface Voltage Selection

rd

The LTE910CF is equipped with a variable voltage interface solution. This allows the user to match the device to the system’s level without extra hardware. Once a voltage has been injected, the unit will swap to the chosen voltage immediately for the affected I/O.

The VL_IN signal can be applied or changed to a different level within the 1.5V to 5.5V operational range after the unit is powered, but once applied the VL_IN voltage should not be removed unless the unit is turned off.

If no external reverence is applied to the VL_IN pin, the I/O interface will default to a 2.85V level. In this case the VL_IN pin 30 should be pulled low.

Truth Table:

VL_IN: Ground 1.5v - 5.5v I/O level: 2.85v 1.5v - 5.5v

Affected I/O:

1. UART (AT, TRACE)

2. GPIO (3-7)

3. VAUX*

4. GNSS Antenna Bias Voltage

*VAUX Adjustment allows feedback as well as legacy access if previously utilizing a plug in implementation with VAUX as the reference.

Note to pay attention of these changes so there are no adverse effects on a previous Modem implementation.

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4 INTERFACES

4.2 Serial Interface

4.2.1 UART Serial Port

The serial interface is a CMOS level UART. Default Communications settings for this port are as follows:

• Baud Rate: 115.2 kbps

• Bits: 8

• Stop Bits: 1

• Parity: None

• Hardware Handshaking: Yes

Baud rate can be controlled with the AT+IPR command. Default setting is 115200 baud.

Note: If you are not using hardware handshaking, RTS must be connected to GROUND for proper communications when ﬂow control is not used.

4.2.1.1 UART Level Translation

The electrical limits for the UART are listed in the electrical characteristics section. Please be aware of these limits, as operating outside of them may damage the unit. If the limits must be exceeded, level translation can be used. An example of basic translation for RXD/TXD only is found below.

Although an external source for the level translation can be used, VAUX can be used as the reference instead.

Figure 2 UART Level Translation Example

However, because some Modems require AT commands to control VAUX, PWRMON may be used as an enable to an external reference. Do not use PWRMON directly as the reference.

Note that the UART Level Translation example remains in this guide for legacy purposes when designing a system for multiple Modems. The LTE910CF is equipped with interface voltage adjustment, negating the need for translation.

4.2.2 USB Port

The Modems that are USB ready include an integrated universal serial bus (USB) transceiver, compliant with USB

2.0 speciﬁcations. High data rates for the USB enabled Modems are only available over the USB interface, as the UART has a maximum baud rate of <1Mbps. In order for proper power-up of the Modems, the USB_VBUS line MUST be disconnected until the unit is otherwise fully powered and on. If the USB_VBUS line is attached and powered before the main power is brought up and the Modem turned on, power sequencing issues may occur.

Note: You must implement the USB interface in order to locally update module ﬁrmware.

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4 Interfaces continued

4.2.2 USB Port continued

4.2.2.1 USB Connection Diagram

When VBUS_ENABLE is HIGH the VBUS 5.0v signal will be passed to USB_VBUS, (pin 29) turning the USB ON.

Figure 3 USB Connection Diagram

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4 Interfaces continued

4.3 Power Supply

The Modem’s power supply accepts input voltages from 4.75Vdc to 5.25Vdc and requires a nominal current sourcing capacity of 5W.

Power Supply

A good understanding of the load transients is required in order to meet the power requirements of a cellular radio. Power supply design, thermal management and layout are outside the scope of this document. Please refer to power supply manufacturers for product documentation and design application notes.

Cellular Load Transients

The LTE modulation schemes used in the LTE910CF v15.00 can result in very dynamic current requirements, with current spikes exceeding 500mA during transmission bursts. LDO (low-drop-out) linear supplies or switching supplies with very fast transient response capabilities are recommended.

On Board Regulator

This Modem is designed with a switching regulator to power the cellular radio. The regulator can receive an input voltage of 4.75 to 5.25VDC.

Note: The regulator input is capable of withstanding 6VDC Maximum. This is outside the recommended operating voltage of the Modems but but is helpful to know when designing input transient circuitry.

Modem Input Supply Requirements

The current values are given in average units due to the pulsed nature of the transmission scheme. It is recommended that your supply source the full peak current value of the transmission pulse in order to maintain proper cellular operation. The use of bulk output capacitors on your supply allows for a less powerful supply.

4.4 Audio Interface

The LE910CF modules use a DVI audio interface that supports PCM master mode and can use a CODEC to convert the interface to analog. Below is a block diagram based on DVI and the MAX9867 CODEC with GPIO 9 and 10 being used for I2C control of the CODEC. Please refer to the referenced DVI Application Notes for full information..

SDA

SCL

DTE

DVI_CLK

GPIO9

GPIO10

DVI_WA0

LTE910CF

DVI_TX

DVI_RX

Figure 4 DVI Block Diagram

Bit Clock

Word Alignment

Data Transmitted

Data Received

BCLK

LRCLK

MAX9867

SDIN

CODEC

SDOUT

Analog In

Analog Out

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4 Interfaces continued

4.5 Pin-Out

PIN STANDARD POWER- PULL PIN NAME DESCRIPTION I/O SIGNAL ON STATE TYPE NOTE

1 SUPPLY Positive Supply Input Power N/A N/A 2 SUPPLY Positive Supply Input Power N/A N/A 3 ENABLE SUPPLY Enable/Disable Supply Input N/A PULL-UP to Vin: 681k 1 4 RXD UART - Transmit Line Output N/A N/A 6 5 DSR UART - Data Set Ready Output N/A N/A 6 6 CTS UART - Clear to Send Output N/A N/A 6 7 RING UART - Ring Indicator Output N/A N/A 6 8 DCD UART - Data Carrier Detect Output N/A N/A 6 9 TXD UART - Receive Line Input N/A N/A 6 10 DTR UART - Data Terminal Ready Input N/A N/A 6 11 RTS UART - Request to Send Input N/A N/A 4 12 GROUND Supply Reference Power N/A N/A 13 TRACE_TX Debug UART - Transmit Line Output N/A N/A 6 14 TRACE_RX Debug UART - Receive Line Input N/A N/A 6 15 GPIO_2 General Purpose I/O - User LED Bi-Direction N/A N/A 6 16 GPIO_1/STATUS General Purpose I/O - Status LED Bi-Direction N/A N/A 6 17 SERVICE Unused N/A N/A N/A 5 18 PWRMON Power Monitor Output Output N/A N/A 6 19 ON_OFF Toggle Cellular Radio On Off State Input N/A PULL-UP to 1.8V 1 20 RESET Reset Cellular Radio Input N/A PULL-UP to 1.8V 1 21 DVI WAO DVI Word Alignment WCLK N/A N/A 6 22 DVI RX DVI Received Data SDIN N/A N/A 6 23 DVI TX DVI Transmitted Data SDOUT N/A N/A 6 24 DVI CLK NDVI Data Clock BCLK N/A N/A 6 25 GROUND Supply Reference Power N/A N/A 26 GROUND Supply Reference Power N/A N/A 27 USB_D- USB Differential Data (-) Bi-Direction N/A N/A 28 USB_D+ USB Differential Data (+) Bi-Direction N/A N/A 29 USB_VBUS USB Supply Power N/A N/A 30 VL_IN Interface Voltage Reference Analog Input N/A N/A 3 31 GPIO_9 General Purpose I/O Bi-Direction INPUT N/A 32 GPIO_10 General Purpose I/O Bi-Direction INPUT N/A 33 GPS_RX Unused N/A N/A N/A 5 34 GPS_TX Unused N/A N/A N/A 5 35 GPS_RESET Unused N/A N/A N/A 5 36 GPIO_7 General Purpose I/O Bi-Direction INPUT N/A 6 37 GPIO_6 General Purpose I/O Bi-Direction INPUT N/A 6 38 GPIO_5 General Purpose I/O Bi-Direction INPUT N/A 6 39 GROUND Supply Reference Power N/A N/A 40 GPIO_4 General Purpose I/O Bi-Direction INPUT N/A 6 41 GPIO_3 General Purpose I/O Bi-Direction INPUT N/A 6 42 Legacy GPIO_2 Unused N/A N/A N/A 5 43 Legacy GPIO_1 Unused N/A N/A N/A 5 44 DAC Unused N/A N/A N/A 5 45 ADC2 Unused N/A N/A N/A 5 46 ADC1 Analog to Digital Converter Analog Input N/A N/A 6 47 VRTC Unused N/A N/A N/A 5 48 VAUX Reference Voltage Analog Output N/A N/A 49 GROUND Supply Reference Power N/A N/A

Notes:

1. It is required that this input be controlled by an Open Collector/Drain Output. Do not use an external pull-up resistor; a pull-up is included internal to the Modem.

2. Not currently implemented.

3. VL_IN should be grounded if not being used.

4. RTS must be connected to GROUND if ﬂow control is not used.

5. Not used on the LTE910CF v15.00.

6. Refer to the electrical speciﬁcations for I/O levels.

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4 Interfaces continued

4.6 VRTC

VRTC (pin 47) pin should be left unconnected. The Cat.M1 LTE910CF V10.00 and V11.00 versions support the RTC via the SUPPLY pins; the internal RTC will be

maintained when in Power Saving Mode (PSM).

4.7 GPIO Details

GPIO are conﬁgurable as input, output, and alternate function. Conﬁguration is controlled by AT commands. Alternate functions include cellular status, ALARM pin function and temperature monitor indication.

4.7.1 Using a GPIO Pin as INPUT

The GPIO pins, 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 voltage levels of the GPIO of the modem.

4.7.2 Using a GPIO Pin as OUTPUT

The GPIO pins, when used as outputs, can drive CMOS digital devices or compatible hardware. When set as outputs, the pins have a push-pull output.

4.7.3 Cellular Status LED (GPIO1)

The Cellular LED output is used to drive an external LED to give feedback on the current operation. See ﬁgure 5 for recommended connection of an LED. For the LTE910CF, this is an alternate function of GPIO1 and must be set via the AT#GPIO command. The defalt status indication is deﬁned below.

Cellular Status Indication

LED Status Device Status

Off Cellular radio is off Off On/Searching Slow Blinking (0.3 sec on / 2.7 sec off) Registered

Figure 5 LED Indicators Diagram

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4 Interfaces continued

4.7 GPIO Details continued

4.7.4 User LED (GPIO2)

The modem has GPIO2 connected to the User LED pin. The user application can use this to control an LED or act as an additional GPIO. See ﬁgure 5 for recommended connection of an LED.

4.7.5 12C

The I2C interface is an alternate function of the modem’s GPIO pins. The I2C SCL clock and I2C SDA data signals are assigned using the AT#I2CRD and AT#I2CWR commands.

To maintain compatability with legacy modems the GPIO 9 (SDA) and GPIO 10 (SCL) pins should be used. These pins are 1.8V logic level to match the DVI interface for easy usage with a codec.

The signals are not pulled up on the Plug-In module and must be pulled up externally for use as an I2C bus. Please reference the Telit AT Command Guide for details on the I2C commands.

4.8 Analog to Digital Converter

Pin 46 is connected directly to the Telit module ADC pin. It has a 0 to 1.8v range with 10 bit resolution. Use the command AT#ADC=1,2<cr> to read the ADC. The returned value is expressed in millivolts.

ADC Description

ADC1 Analog to digital converter input

4.9 Internal Interfaces

4.9.1 ENABLE Pin

Input Logic State Description

High-Z Active state 0 Reset state

Notes:

1. It is required that this input be controlled by an open collector/drain output. Do not use an external pull-up resistor, a pull-up to VIN is included internal to the Modem.

2. The ENABLE pin is offered as a means to turn off the on-board regulator for when a full power cycle is needed or an ultra low power state is required. The ENABLE pin is not intended to be used as a means of turning the Modem off. use the ON/OFF pin to turn the Modem on or off.

3. Shut down state must be held for 10ms before returning to active state.

4. The regulator is operational 2mS after active state is entered.

Figure 6 Enable Pin

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4 Interfaces continued

4.9 Internal Interfaces continued

4.9.2 RESET Pin

Input Logic State Description

High-Z Active state 0 Reset state

Notes:

1. It is required that this input be controlled by an open collector/drain output. Do not use an external pull-up resistor, a pull-up is included internal to the Modem.

2. The RESET pin is offered as a means to reset the Modem when and if the Modem becomes unresponsive. The RESET pin is not intended to be used as a means of turning the Modem off. Use the ON/OFF pin to turn the Modem on or off.

3. RESET state must be held for at least 200ms before returning to active state.

Figure 7 Reset Pin Diagram

4.9.3 ON/OFF Pin

Input Logic State Description

High-Z Modem turned ON or OFF after input returns to this state. 0 Toggle Modem ON or OFF

Notes:

1. It is required that this input be controlled by an open collector/drain output. Do not use an external pull-up resistor, a pull-up is included internal to the Modem.

2. The ON_OFF pin is offered as a means to power-on and power-down the Modem. When the Modem powers-down it informs the cell tower that it is powering down and will not be communicating with the tower any more. This is considered a controlled power-down.

3. After toggling the power state of the Modem, wait until PWRMON indicates chosen state before toggling the power state again.

4. To turn ON the Modem, the ON_OFF input must be tied low for 5 seconds then released.

5. To turn OFF the Modem, the ON_OFF input must be tied low for 3 seconds then released.

6. Optionally the Modem may be powered-down with the use of AT commands.

7. It is required to stop driving terminal inputs high when turning ON the Modem by ﬂoating or bringing them low. If this is not done, power sequencing issues may occur.

Figure 8 On / Off Pin Diagram

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4 Interfaces continued

4.9 Internal Interfaces continued

4.9.4 PWRMON Pin

Output Logic State Description

0 Modem powered-down 1 Modem powered-on

Notes:

1. Used in conjunction with ON/OFF pin to control power-on and power-down state.

2. During a power down, it is required to stop driving terminal inputs high by ﬂoating or bringing them low. If this is not done, the PWRMON output will

not transition low. On the GSM865CF and LTE910CF, this will cause the VAUX output to remain active.

4.9.5 VAUX

A regulator power supply output that is provided in order to supply small devices from the Modem itself. When PWRMON is HIGH, VAUX will be ON. When PWRMON is LOW, VAUX will be OFF. On the LTE910CF, the

VAUX signal voltage will match to the VL IN voltage if utilized.

4.10 RF Interface

There are two RF interfaces on the Modem for a cellular antenna and a GNSS antenna. The speciﬁcations and requirements for these are as follows:

4.10.1 LTE910CF Antenna Interface

Type: Hirose U.FL - MALE (Part Number: U.FL-R-SMT(10))

Pin Description

Center Pin RF signal Outer Conductor Signal ground

4.11 SIM Card Interface

The SIM Card Interface allows the Modem to accept the subscriber card provided by the cellular telephone provider. It can accommodate a 1.8v or 3.0v SIM card.

4.12 Header Interface Mounting Options

The Modems’ header pin length has been chosen to allow for direct solder mount to a PCB of standard thickness. If the user wishes to socket the Modem, they may do so as well by using the below part numbers for reference:

Samtec 25 pin header: TSM-125-04-L-SV-A Samtec 24 pin header: TSM-124-04-L-SV-A Mating Samtec 25 pin connector: SLW-125-01-G-S Mating Samtec 24 pin connector: SLW-124-01-G-S

Please note there are no Samtec SMT single row mating connectors. The only mating connector available is the above listed THT version.

4.13 Screw Mounting

The LTE910CF allows for the use of a #4 machine screw to help keep a socketed Modem in place where environmental variables may cause problems otherwise. If the user wishes to have a stand-off underneath the Modem to help alleviate possible stress from mounting hardware, below are the Janus part numbers and

associated drawings for an available solution. 4-40 Hex Female Stand-off: MC-0356-G 4-40 3/16” Pan Head Phillips Machine Screw: MC-0357-G

Figure 9 Screw Diagram

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5 LTE910CF TECHNICAL SPECIFICATIONS

5.1 Electrical Speciﬁcation

5.1.1 Absolute Maximum Ratings

Parameter Min Typ Max Unit Note

VIN (DIGITAL INPUTS 2.85V CMOS) -0.5 - 3.35 Volt VIN (DIGITAL INPUTS 1.8V CMOS) -0.3 - 3.1 Volt VIN (Digital Inputs VL Selected) -0.3 - 5.5 Volt Storage Temperature -40 - 85 °C Supply (+) referenced to Supply (-) 0 - 6 Volt

Operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions is not implied. Exposure to Absolute

Maximum Rating conditions for extended periods of time may affect device reliability.

5.1.2 Recommended Operating Conditions

Parameter Min Typ Max Unit Note

Temperature -40 - 85 °C Supply (+) referenced to Supply (-) 4.75 5.0 5.25 Volt VL IN Selection 1.8 - 5.0 Volt VAUX Output - 2.85 - Volt 1 VAUX Current - - 100 mA 1

Note: 1. When VL IN is utilized, VAUX will match VL.

5.1.3 Power Supply

Mode Average (mA) Mode Description

Switched Off Terminal Disabled < 15µA Terminal disabled (ENABLE SUPPLY = 0)

Cellular Radio Off 0.4

(PWRMON=0) IDLE mode AT+CFUN=1 LTE 13 Normal mode: full functionality of the module WCDMA 15 AT+CFUN=4 11 Disabled TX and RX; module is not registered on the network AT+CFUN=5 LTE 2 to 6 Depends on paging cycle WCDMA 2 Operative mode LTE Data call 190 Channel BW 5MHz, RB=1, TX=0dBm LTE Data call Max power 500 Channel BW 5MHz, RB=1, TX=22dBm WCDMA Voice 140 WCDMA voice call (TX = 9dBm) WCDMA HSDPA Max power 440 WCDMA data call (RMC, TX = 23dBm)

Note: Values are calculated based on power supply efﬁciency.

Cellular module powered but switched off via ON_OFF pin

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5 LTE910CF TECHNICAL SPECIFICATIONS continued

5.1 Electrical Speciﬁcation continued

5.1.4 I/O Levels

5.1.4.1 1.8v Standard Interface Levels (GPIO 1,2,8,9)

Parameter Min Typ Max Unit Note

Input Voltage High - Vih 1.5 - 1.9 Volt Input Voltage Low - Vil 0 - 0.35 Volt Output Voltage High - Voh 1.6 - 1.9 Volt Output Voltage Low - Vol 0 - 0.2 Volt Typical Current Source/Sink = 100uA/1uA

5.1.4.2 2.85v Standard Interface Levels (UART, GPIO 3-7)

Parameter Min Typ Max Unit Note

Input Voltage High - Vih 1.85 - 2.85 Volt Input Voltage Low - Vil 0 - 0.99 Volt Output Voltage High - Voh 2.45 - 2.85 Volt Output Voltage Low - Vol 0 - 0.4 Volt Typical Current Source = 100uA/1uA

5.1.4.3 VL IN Selected Interface Levels (UART, GPIO 3-7)

Parameter Min Typ Max Unit Note

Input Voltage High - Vih VL*0.65 - VL Volt Input Voltage Low - Vil 0 - VL*0.35 Volt Output Voltage High - Voh VL-0.4 - VL Volt Output Voltage Low - Vol 0 - 0.4 Volt

5.1.4.4 ADC Input Levels

Parameter Min Typ Max Unit Note

Input Voltage Range 0.1 - 1.7 Volt AD Conversion - - 8 Bits Input Resistance 1M - - Ohm Input Capacitance - 1 - pF

5.1.4.5 Reset Pin Input Levels

Parameter Min Typ Max Unit Note

Input Voltage High - Vih 1.5 - 1.9 Volt Input Voltage Low - Vil 0 - 0.35 Volt

It is required that this input be controlled by an Open Collector/Drain Output. Do not use an external pull-up resistor, a pull-up is included internal to the Modem.

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5 LTE910CF TECHNICAL SPECIFICATIONS continued

5.1 Electrical Speciﬁcation continued

5.1.5 LTE Cellular Antenna Speciﬁcations:

5.1.5.1 LTE910CF v15.00

Parameter Description

Frequency Range Depending on frequency bands provided by the network operator, the customer should use the most suitable antenna for those frequencies. Gain < 3dBi Impedance 50W Input Power > 24 dBm average power in WCDMA & LTE VSWR Absolute Max VSWR Recommended

Cellular Antenna Frequency Range Section

Band TX (MHz) RX (MHz)

WCDMA B2 1900 1850 ~ 1910 1930 ~ 1990 WCDMA B4 AWS 1710 ~ 1755 2110 ~ 2155 WCDMA B5 850 824 ~ 849 869 ~ 894 LTE B2 1900 1850 ~ 1910 1930 ~ 1990 LTE B4 AWS 1710 ~ 1755 2110 ~ 2155 LTE B5 850 824 ~ 849 869 ~ 894 LTE B12 700a 699 ~ 716 729 ~ 746 LTE B13 700c 777 ~ 787 746 ~ 756 LTE B14 700PS 88 ~ 798 758 ~ 768 LTE B66 AWS-3 1710 ~ 1780 2210 ~ 2200 LTE B71 600 663 ~ 698 617 ~ 652

< <

10:1 2:1

5.1.6 LTE910CF GNSS: GPS and GLONASS Antenna Speciﬁcations:

5.1.6.1 Antenna Speciﬁcations

Parameter Description Note

Input Voltage Range 2.85v or VL IN 1 Frequency Range 1559.0 to 1610.0 MHz Gain 17 dB typical 2 Impedence 50W VSWR < 3:1 Current Consumption 30mA Max, 20mA Typ.

Note 1: When VL IN is utilized, GPS Bios Voltage will match VL.

Note 2: From Telit LE910Cx Hardware Design Guide:

An external GNSS pre-ﬁlter is required for the GLONASS application. The GNSS pre-ﬁlter must meet the following requirements: Source and load impedance = 50 Ohm Insertion loss (1575.42–1576.42 MHz) = 1.4 dB (Max) Insertion loss (1565.42–1585.42 MHz) = 2.0 dB (Max) Insertion loss (1597.5515–1605.886 MHz) = 2.0 dB (Max)

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5 LTE910CF TECHNICAL SPECIFICATIONS continued

5.1 Electrical Speciﬁcation continued

5.1.7 USB Transceiver Speciﬁcations

Parameter Comments Min Typ Max Unit

USB_VBUS Supply voltage 4.5 5.0 5.25 Volt Input levels for low-/full speed Receiver threshold (single-end) 0.8 - 2.0 Volt Differential input sensitivity |D+ - D-|, Vin = 0.8V to 2.5V 0.2 - - Volt Differential common-mode range Includes VDI 0.8 - 2.5 Volt Output levels for low-/full speed Low RL = 1.5 kW to 3.6 V - - 0.3 Volt High RL – 15 kW to GND 2.8 - 3.6 Volt Output signal crossover voltage 1.3 - 2.0 Volt Terminations Internal pull-up resistor VTRM to D+, VTRM to D- 1.425 1.5 1.575 kW Internal pull-down resistor D= to GND, D- to GND 14.3 15 24.8 kW High-Z state output impedance 0 V< VDD< 3.6 V; measured at D+ and D- pins to GND 300 - - kW Termination voltage An internal supply voltage, VTRM 3.0 3.3 3.6 Volt Driver characteristics – full speed Transition time: Rise time CL = 50 to 125 pF 4 - 20 ns Fall time CL – 50 to 125 pF 4 - 20 ns Rise/fall time matching 90 - 111 % Series output resistance D+, D- 28 33 44 W Driver characteristics – low speed Transition time: Rise time CL = 50 to 600 pF 75 - 300 ns Fall time CL – 50 to 600 F 75 - 30 ns Rise/fall time matching 80 - 125 %

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5 LTE910CF TECHNICAL SPECIFICATIONS continued

5.2 Mechanical Speciﬁcation

LTE910CF

Figure 10 LTE910CF Mechanical Dimensions

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6 Operation

6.1 Powering ON/OFF

6.1.1 Powering ON

Power the Modem ON by pulling the ON_OFF signal (Pin 19) to ground for at least ﬁve (5) seconds, then release.

6.1.2 Powering OFF

There are two methods to to turn OFF the Modem under normal circumstances:

• Use the AT shutdown command (AT#SHDN)

• Pull ON_OFF signal (Pin 19) to ground for at least three (3) seconds, then release.

In both instances, power can be removed from the modem once the PWRMON signal goes low. Under abnormal circumstances, the modem can be shut down using the RESET input (pin 20).

6.2. Communicating with the Modem

The default conﬁguration of the modem has AT command ports available on the UART interface and the USB interface.

6.2.1 UART Interface

The UART port operates at a the following default parameters:

• Baud Rate: 115.2 kbps

• Bits: 8

• Stop Bits: 1

• Parity: None

• Hardware Handshaking

6.2.2 USB Interface

The USB port instantiates two serial modem connections as AT command ports by default. USB drivers are available from Telit or Janus.

6.3 Testing Communications

• The cellular module should always respond to the attention command with ‘OK’. Send:

AT<cr>

Note 1. “<cr>” designates a carriage return character.

1

The module will response with ‘OK’.

• Verify the module model. Send:

AT+CGMM<cr>

The response should be the Telit module model number.

• Verify the ﬁrmware version. Send:

AT+CGMR<cr>

The response will be the Telit module’s current ﬁrmware.

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6 Operation continued

6.4 Cellular Network Communications

6.4.1 SIM Card

All LTE modems require a SIM card. The LTE910CF v15.00 uses a 2FF ‘mini’ sizes SIM card.

6.4.2 Data Contexts - setting the APN

6.4.2.1 Checking the Data Contexts

Data connections require that the carrier’s Access Point Name (APN) be properly set in the data contexts using the AT+CGDCONT command. In LTE modules, some contexts may be assigned for the carrier’s use.

The data contexts can be checked by entering the following command:

AT+CGDCONT?<cr>

The module will respond with the current data contex settings.

NOTE: A SIM card must be present to read the data contexts. The default settings for the LTE Cat.M1 modems are as follows:

AT&T centric (#FWSWITCH=0):

+CGDCONT: 1,”IPV4V6”,”nxtgenphone”,””,0,0,0,0

+CGDCONT: 2,”IPV4V6”,”ims”,””,0,0,0,0

+CGDCONT: 3,”IPV4V6”,”sos”,””,0,0,0,1

Context ID 1 is for the user’s data connection. It must be set to an appropriate APN for AT&T or similar carrier.

Verizon (#FWSWITCH=1):

+CGDCONT: 1,”IPV4V6”,”ims”,””,0,0,0,0

+CGDCONT: 2,”IPV4V6”,”vzwadmin”,””,0,0,0,0

+CGDCONT: 3,”IPV4V6”,”vzwinternet”,””,0,0,0,0

+CGDCONT: 4,”IPV4V6”,”vzwapp”,””,0,0,0,0

+CGDCONT: 5,”IPV4V6”,””,””,0,0,0,1

+CGDCONT: 6,”IPV4V6”,”vzwclass6”,””,0,0,0,0

Context ID 3 is for the user’s data connection. It must be set to an appropriate APN for Verizon.

T-Mobile (#FWSWITCH=2):

+CGDCONT: 1,”IPV4V6”,”fast.t-mobile.com”,””,0,0,0,0

+CGDCONT: 2,”IPV4V6”,”ims”,””,0,0,0,0

+CGDCONT: 3,”IPV4V6”,”sos”,””,0,0,0,1

Context ID 1 is for the user’s data connection. It must be set to an appropriate APN for T-Mobile.

6.4.2.2 Setting the Data Contexts

Make sure you are using an acceptable APN or the device will not register on the network. For example, a static APN for Verizon might be “mw01.vzwstatic”.

To set a data context with this APN, enter the following:

AT+CGDCONT=1,”IPV4V6”,”mw01.vzwstatic”<cr>

and wait for the “OK” response.

NOTE: Carrier services such as a staic IP address or VPN may require a specialized APN.

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6 Operation continued

6.4 Cellular Network Communications continued

6.4.3 Signal Strength

Signal channel can be checked as follows. Enter:

AT+CSQ<cr>

The default response format will contain two numbers:

+CSQ: 17,0

The ﬁrst number is the rssi (received signal strength indication) and the second is ber (bit error rate). The rssi can be interpreted as follows: 10-14 Okay 15-20 Good 20+ Excellent. Anything below 10 would be considered marginal. A response of 99 indicates no signal.

6.4.4 Registration

Network registration can be checked as follows. Enter:

AT+CEREG?<cr>

A response of +CEREG:0,1 or +CEREG: 0,5 indicates the device is registered to the home network or roaming, respectively.

If response is different than this, please refer to the Telit AT command reference document for more information

6.5 Data Communications

The modem incorporates a TCP/IP stack that can be used to directly send data using AT commands. Alternativly, an external host can be used to make a PPP connection.

6.5.1 Data Communications - Using the Internal Stack

To send data using the internal stack, a data context must be activated.

Activate the context as follows:

AT&T centric -or- T-Mobile (context 1):

Enter:

AT#SGACT=1,1<cr>

Verizon (context 3):

Enter:

AT#SGACT=3,1<cr>

If successful, the modem will respond with an IP address assigned by the carrier. Data can be sent to a host with a socket dial command. Enter:

AT#SD=<connid>,0,80,<IPaddr>

where <connid> is the user data context (1 or 3 depending on carrier) and <IPaddr> is a text string (in quotes) containing a dotted IP address or a DNS resovable host name.

The modem will respond with CONNECT and any data entererd thereafter will be sent to the connected host. Enter the escape sequence:

+++

to suspend the connection.

See the Telit IP Easy User Guide and the Telit AT Commands Guide for more information.

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6 Operation continued

6.5 Data Communications cintinued

6.5.2 PPP Dialing

In a hosted system (e.g. Linux) the host TCP/IP stack can be used. A PPP connection is initiated using the ATD dialing command. Depending on the script or application performing the PPP connection, you may have to change the numeric digit in the PPP AT dialing command that designates the context to use.

The dialing string for AT&T centric -or- T-Mobile (context 1) would be:

ATD*99***1#<cr>

Where the ‘1’ digit selects the #1 data context set with the +CDGCONT command.

The dialing string for Verizon (context 3): would be:

ATD*99***3#<cr>

Where the ‘3’ digit selects the #3 data context set with the +CDGCONT command.

6.6 SMS

SMS allows you to send a text message (max 160 characters) to a SMS capable unit.

• Set the SMS mode to text. This setting is not persistant; it must be entered every power cycle.

AT+CMGF=1<cr>

• To enter the receiving subscriber unit phone number and message enter:

AT+CMGS=”8885551234”<cr>

Wait for response ”>” then enter message text .

Enter

<ctrl-z>

to end the message text and send it.

6.7 GNSS

The GNSS system on the Telit module includes support for stand-alone operation with GPS and GLONASS. It also supports A_GPS (assisted GPS) using C-Plane and SUPL (Secure User Plane Location) archetectures. A simple example of stand-alone GPS operation follows. Turn on the GNSS system:

AT$GPSP=1<cr>

Turn on the antenna bias voltage:

AT$GPSAT=1

The current GPS ﬁx information can be read using:

AT$GPSACP<cr>

NMEA data can be continuously streamed. Enter:

AT$GPSNMUN=3,1,1,1,1,1,1<cr>

This enables multiple NMEA data messages and they will be continuously streamed to the AT command port until an escape sequence (“+++”) is entered.

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6 Operation continued

6.8 Firmware Selection

The LTE910CF V15.00 uses the Telit LE910C1-NF Single SKU module which has different ﬁrmware to support operation on AT&T centric, Verizon and T-Mobile cellular networks. The ﬁrmware load can be changed by issuing the command:

AT#FWSWITCH=<image_number>,1

where <image_number> is 0 for AT&T centric 1 for Verizon 2 for T-Mobile. The module will automatically reboot with the new ﬁrmware image.

Current ﬁrmware status can be checked by issuing the command:

AT#FWSWITCH?

The response will be #FWSWITCH: <image_number>,n where <image_number> is as described above.

Note that normally different SIM cards will be required for operation under the different carrier versions. More information can be found in the Telit Single SKU AT Command Application Note.

7 Design Considerations

7.1 Minimum Required Module Pin Connects

Pin Signal Function Note

1 VBATT Main power supply 2 VBATT Main power supply 12 GND Ground 25 GND Ground 26 GND Ground 39 GND Ground 49 GND Ground 9 TXD Serial data input (TXD) from DTE 4 RXD Serial data output to DTE 11 RTS Input for request to send signal (RTS) from DTE 2 19 ON/OFF Input command for switching power ON or OFF(toggle command) 20 RESET Reset input

Note:

1. If the application uses USB as the main interface to the Modem, this is sufﬁcient to capture any debug or trace data, provided the application can export the diagnostic port externally.

2. RTS must be connected to ground if ﬂow control is not used.

7.2 Debug:

Debug of the Modems in production To test and debug the mounting of the Modem, we strongly recommend test pads on the host PCB. This will allow veriﬁcation of the connection between the module itself and the application and to test the performance of the module connecting it with an external computer.

Depending on the customer application, these pads include, but are not limited to the following signals:

• TXD

• RXD

• ON/OFF

• RESET

• GND

• VBATT

• TX_TRACE

• RX_TRACE

• PWRMON

• USB D+

• USB D-

• USB V_BUS

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APPENDICES

Approvals

LTE910CF V15.00 FCC Approval: RI7LE910CxNF Carrier approvals: PTCRB AT&T Verizon - PENDING T-Mobile - PENDING

Antenna Care and Replacement

Do not use the Modem with a damaged antenna. Buy the antenna from an approved suppliers list. Using unauthorized antennas, modiﬁcations, or attachments could damage the Modem and may violate local RF emission regulations or invalidate type approval.

Abbreviations

3GPP 3rd Generation Partnership Project AC Alternating Current ADC Analog To Digital Converter APN Access Point Name BER Bit Error Rate CD Carrier Detect CDMA Code Division Multiple Access CTS Clear To Send DB Decibel DC Direct Current DCE Data Communications Equipment DSR Data Set Ready DTMF Dual-tone multi-frequency DTR DTE Ready GNSS Global Navigation Satellite System GPIO General Purpose Input Output GPRS General Packet Radio Service GSM Global System Mobile

HSPA High Speed Packet Access LTE Long Term Evolution IoT Internet of Things LED Light Emitting Diode M2M Machine To Machine RF Radio Frequency RI Ring Indicator RSSI Received Signal Strength Indication RTS Request To Send RxD Received Data SMS Short Message Service TTFF Time To First Fix TxD Transmitted Data UICC Universal Integrated Circuit Card UMTS Universal Mobile Telecommunications System USIM Universal Subscriber Identity Module VSWR Voltage Standing Wave Ratio WCDMA Wideband Code Division Multiplexing Access

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LTE910CF v15.00 CAT1 Embedded Cellular Modem User Manual

Ordering Information

Ordering Information Description

LTE910CF V15.00 LTE Cat.1 Modem GNSS Enabled AT&T / Verizon / T-Mobile

Revision History

Revision Revision Date Note

P00 11/20/19 Preliminary LTE910CF v15.00 User Manual 01 11/05/20 Updated SIM card information

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Phone: 630.499.2121 • info@janus-rc.com

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Janus LTE910CF User Manual

Specifications and Main Features

Frequently Asked Questions

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