Janus remote communications Lte910cf User manual

LTE910CF v18.00 CAT1 Embedded

Cellular Modem User Manual

Bulletin

JA03-UM-LTE910CF-v18

Revision 02

Date 30 July 2020

LTE910CF Hardware User Manual

JA03-UM-LTE910CF-v18.00

Page 2 Rev: 02 Date: 07/30/20

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. Connor-

Winﬁeld 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.

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 LTE Features ............................................................................................................................................................ 5

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

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

4 INTERFACES ................................................................................................................................................................... 6-15

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

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

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

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

4.5 Plug-In Pin-Out ...................................................................................................................................................... 10

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

4.7 GPIO Details .......................................................................................................................................................... 12

4.8 Analog to Digital Converter ................................................................................................................................... 13

4.9 LED Status Indicators ....................................................................................................................................... 13-15

4.10 RF Interface ........................................................................................................................................................... 15

4.11 SIM Card Interface ................................................................................................................................................ 15

4.12 Header Interface Mounting Options ...................................................................................................................... 15

4.13 Screw Mounting .................................................................................................................................................... 15

5 LTE910CF TECHNICAL SPECIFICATIONS ................................................................................................................... 16-19

5.1 Electrical Speciﬁcations ................................................................................................................................... 16-18

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

6 OPERATIONS ................................................................................................................................................................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 ...................................................................................................................21-23

6.5 Data Communications ...................................................................................................................................... 23-24

6.6 SMS ....................................................................................................................................................................... 24

6.7 Firmware Selection ................................................................................................................................................ 24

7 DESIGN CONSIDERATIONS .............................................................................................................................................. 25

7.1 Minimum Required Module Pin Connects............................................................................................................. 25

7.2 Debug .................................................................................................................................................................... 25

APPENDICES ........................................................................................................................................................................ 26

Approvals .............................................................................................................................................................. 26

Safety .................................................................................................................................................................... 26

Antenna Care and Replacement ........................................................................................................................... 26

Abbreviations ......................................................................................................................................................... 27

Ordering Information ............................................................................................................................................. 27

Revision History..................................................................................................................................................... 27

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1 APPLICABILITY TABLE

Product Part Number

LTE910CF v18.00

2 REFERENCES

2.1 Janus Document List

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

2.2 Telit Document List

LTE910CF v18.00

Our modem uses Telit LE910-NA1 cellular module.

Please refer to Telit’s website at www.telit.com for the latest information on the LE910 V2 module family.

Telit LE910 V2 AT Commands Reference Guide

Telit LE910 V2 Hardware User Guide

Telit IP Easy User Guide

Telit Single SKU AT Command Application Note

Telit 3G-4G 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/HSPA/UMTS (AT&T centric - #FWSWITCH=0)

• LTE (Verizon - #FWSWITCH=1)

UART

• 115200 bps 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

(TOP VIEW)

.047 DIA (49)

.100 TYP

1.100

.100 TYP

.050

2.400

2.300

PIN 1 PIN 25

PIN 26PIN 49

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LTE910CF v18.00 (AT&T centric - #FWSWITCH=0)

Multi-Band Support:

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

• UMTS/HSPA+ Band 850 (B5), 1900 (B2)

Output Power:

• Class 3 (0.2W) @ LTE

• Class 3 (0.25W) @ WCDMA

Data:

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

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

• UMTS: DL: Up to 384Kbps, UL: Up to 384Kbps

LTE910CF v18.00 (Verizon - #FWSWITCH=1)

Tri-Band Support:

• LTE Band 1900 (B2), 1700 (B4), 700 (B13)

Output Power

• Class 3 (0.2W, 23dBm) @ LTE

Data

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

Features for Both AT&T centric and Verizon

• 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: 2.5 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

• Cellular, Rx Diversity & MIMO DL 2x2 antenna connections

via Hirose U.FL miniature RF connectors

3.4 Block Diagram

3 OVERVIEW continued

3.3 Features

Figure 1 LTE910CF v18.00 CAT1 Block Diagram

TELIT

LE910

TELIT

LE910

Switching Regulator

LTE910CF

GPIO2 : USER LED

USB

VSel UART (AT)

VSel UART (TRACE)

VSel GPIO (3-7)

5 VDC

ENABLE

1.8v PWRMON

RESET

ON/OFF

1.8v VRTC

GPIO1 : Cellular LED

1.8v DVI

LDO

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

Enable

1.8v GPIO

1.8v GPIO9 / I2C SDA

1.8v GPIO10 / I2C SCL

Reference

VL

2.85v Vo

Select

Vo

Select VSel VAUX

VSel

SIM CARD

SIM CARD SIM CARD

SIM CARD

SIM

SWITCH

SIM

SWITCH

GPIO8

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3 OVERVIEW continued

3.5 FOTA Notice

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*

*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.

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 3rd

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

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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.

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

Figure 2 UART Level Translation Example

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Figure 3 USB Connection Diagram

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.

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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.

4 Interfaces continued

4.3 Power Supply

The Modem’s power supply accepts input voltages from 2.5 to 5.25 Vdc 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 V10.00 and V11.00 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 2.5 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.

LTE910CF

DTE MAX9867

CODEC

Bit Clock

Word Alignment

Data Transmitted

Data Received

SDA

SCL

GPIO9

GPIO10

Analog Out

Analog In

DVI_CLK

DVI_WA0

DVI_TX

DVI_RX

BCLK

LRCLK

SDIN

SDOUT

Figure 4 DVI Block Diagram

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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 5

5 DSR UART - Data Set Ready Output N/A N/A 5

6 CTS UART - Clear to Send Output N/A N/A 5

7 RING UART - Ring Indicator Output N/A N/A 5

8 DCD UART - Data Carrier Detect Output N/A N/A 5

9 TXD UART - Receive Line Input N/A N/A 5

10 DTR UART - Data Terminal Ready Input N/A N/A 5

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 5

14 TRACE_RX Debug UART - Receive Line Input N/A N/A 5

15 GPIO_2 General Purpose I/O - User LED Bi-Direction N/A N/A 5

16 GPIO_1/STATUS General Purpose I/O - Status LED Bi-Direction N/A N/A 5

17 SERVICE Unused N/A N/A N/A 2

18 PWRMON Power Monitor Output Output N/A N/A 5

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 Bi-Direction N/A N/A 5

22 DVI RX DVI Received Data Input N/A N/A 5

23 DVI TX DVI Transmitted Data Output N/A N/A 5

24 DVI CLK DVI Data Clock Bi-Direction N/A N/A 5

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 2

34 GPS_TX Unused N/A N/A N/A 2

35 GPS_RESET Unused N/A N/A N/A 2

36 GPIO_7 General Purpose I/O Bi-Direction INPUT N/A 5

37 GPIO_6 General Purpose I/O Bi-Direction INPUT N/A 5

38 GPIO_5 General Purpose I/O Bi-Direction INPUT N/A 5

39 GROUND Supply Reference Power N/A N/A

40 GPIO_4 General Purpose I/O Bi-Direction INPUT N/A 5

41 GPIO_3 General Purpose I/O Bi-Direction INPUT N/A 5

42 Legacy GPIO_2 Unused N/A N/A N/A 2

43 Legacy GPIO_1 Unused N/A N/A N/A 2

44 DAC Unused N/A N/A N/A 2

45 ADC2 Unused N/A N/A N/A 2

46 ADC1 Analog to Digital Converter Analog Input N/A N/A 5

47 VRTC Cellular Radio External RTC Supply Power N/A N/A

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

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4 Interfaces continued

4.6 VRTC Details

The VRTC pin brings out the real time clock supply, which is separate from the rest of the part. This allows only

the RTC to be ON when all other parts of the device are OFF. A backup capacitor can be added to this pin to

increase RTC autonomy while powering the device from a battery.

No devices should be powered from this pin.

Equations:

C = 3600 * [(Btime * IRTC)/(VRTC - VRTCmin)]

Btime = [C * (VRTC - VRTCmin)/(IRTC * 3600)]

Where:

VRTC – The Starting voltage of the capacitor (Volt)

VRTCmin – The minimum voltage acceptable for the RTC circuit. (Volt)

IRTC – The current consumption of the RTC circuitry when VBATT = 0 (Ampere)

Btime - Backup Time (Hours)

C = Capacitor value (Farads)

Values for the LTE910CF

VRTC = 1.8v Nominal

VRTC minimum input voltage to function = 1.1v

IRTC = 2uA nominal

For Example,

Btime = 96 hours (4 days)

C = 1.0F

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4 Interfaces continued

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, temperature monitor indication and DAC output.

4.7.1 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 Voltage levels of the GPIO of the module.

4.7.2 Using a GPIO Pad as OUTPUT

The GPIO pads, when used as outputs, can drive CMOS digital devices or compatible hardware. When set as

outputs, the pads have a push-pull output.

4.7.3 Cellular Status LED (GPIO1)

The LED Status output is used to drive an external LED to give feedback on the current operation. See ﬁgure 8

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 status is deﬁned below.

Cellular Status Indication

LED Status Device Status

Off Cellular radio is off

On On/Searching

Slow Blinking (0.3 sec on / 2.7 sec off) Registered

4.7.4 User LED (GPIO2)

This module has GPIO2 connected to the User LED pin of the Modem. 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.

Figure 5 LED Indicators Diagram

4.7.5 I2C

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.

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4 Interfaces continued

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 AT

command

AT#ADC=1,2

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.

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 7 Reset Pin Diagram

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. See section 6.4.1 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 (-) 2.5 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 Consumption 1, 2, 3

Mode Average (mA) Mode Description

Switched Off

Module OFF; power ENABLE open (ON) 0.12 Module supplied but switched off

Module OFF; power ENABLE low (OFF) 0.025 On-board power supply disabled

IDLE Mode

AT+CFUN=1 LTE 11 Normal mode: full functionality of the module

AT+CFUN=1 WCDMA 13 Normal mode: full functionality of the module

AT+CFUN=1 GSM 12 Normal mode: full functionality of the module

AT+CFUN=4 9.3 Disabled TX and RX; module is not registered on the network

AT+CFUN=5 LTE 4.9 Paging cycle #32 frames (0.32 sec DRx cycle)

AT+CFUN=5 LTE 3 Paging cycle #64 frames (0.64 sec DRx cycle)

AT+CFUN=5 LTE 1.7 Paging cycle #128 frames (1.28 sec DRx cycle)

AT+CFUN=5 LTE 1.5 Paging cycle #256 frames (2.56 sec DRx cycle)

AT+CFUN=5 WCDMA 1.4 DRx7

AT+CFUN=5 GSM 1.9 DRx2

AT+CFUN=5 GSM 1.4 DRx5

AT+CFUN=5 GSM 1.3 DRx9

Operative Mode

LTE Data call 160 Channel BW 5MHz, RB=1, TX=0dBm

LTE Data call Max power 420 Channel BW 5MHz, RB=1, TX=22dBm

WCDMA Voice 120 WCDMA voice call (TX = 9dBm)

WCDMA HSDPA Max power 370 WCDMA data call (RMC, TX = 23dBm)

EDGE 2TX+3RX Low Band Gamma 7 240 EDGE Sending data mode

EDGE 2TX+3RX High Band Gamma 6 190 EDGE Sending data mode

GSM TX and RX Low Band PL5 250 GSM VOICE CALL

GSM TX and RX High Band PL0 150 GSM VOICE CALL

GPRS 2TX+3RX Low band Gamma 3 490 GPRS Sending data mode

GPRS 2TX+3RX High band Gamma 3 300 GPRS Sending data mode

Note 1: These ﬁgures are derived from the component data sheets including the Telit Hardware User Guide. Per Telit,

“The reported values are an average among all the product variants and bands for each network wireless technology.”

Results can vary depending network conditions.

Note 2: Values are calculated based on 5.0 volt supply voltage and on-board power supply efﬁciency.

Note 3: WCDMA only available on AT&T centric mode (#FWSWITCH=0)

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5.1 Electrical Speciﬁcation continued

5.1.4 I/O Levels

5.1.4.1 1.8v Standard Interface Levels (GPIO 1, 2, 9,10)

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 - 1.8 Volt

AD Conversion - - 10 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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5.1 Electrical Speciﬁcation continued

5.1.5 LTE Cellular Antenna Speciﬁcations:

5.1.5.1 LTE910CF v18.00 (AT&T centric - #FWSWITCH=0)

Parameter Description

Frequency Range Depending on frequency bands provided by the network operator, the customer

should use the most suitable antenna for those frequencies.

Bandwidth WCDMA 1900 (B2): 140Mhz

WCDMA 850 (B5): 70Mhz

LTE 1900 (B2): 140Mhz

LTE 1700 (B4): 445Mhz

LTE 850 (B5): 70Mhz

LTE 700 (B17): 42Mhz

LTE 700 (B12): 47Mhz

Impedance 50Ω

Input Power >24 dBm Average power in WCDMA & LTE

VSWR Absolute Max ≤ 10:1

VSWR Recommended ≤ 2:1

5.1.5.2 LTE910CF v18.00 (Verizon - #FWSWITCH=1)

Parameter Description

Frequency Range Depending on frequency bands provided by the network operator, the customer

should use the most suitable antenna for those frequencies.

Bandwidth LTE 1900 (B2): 140 MHz

LTE 1700 (B4): 445Mhz

LTE 700 (B13): 41Mhz

Impedance 50Ω

Input Power >24 dBm Average power

VSWR Absolute Max ≤ 10:1

VSWR Recommended ≤ 2:1

5.1.6 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 kΩ to 3.6 V - - 0.3 Volt

High RL – 15 kΩ 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 kΩ

Internal pull-down resistor D= to GND, D- to GND 14.3 15 24.8 kΩ

High-Z state output impedance 0 V< VDD< 3.6 V; measured

at D+ and D- pins to GND 300 - - kΩ

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 Ω

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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5.2 Mechanical Speciﬁcation

Figure 10 LTE910CF Mechanical Dimensions

LTE910CF

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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 1

Note 1. The default termination character for ALL AT commands is the carriage return character.

The module will response with ‘OK’.

Verify the module model. Send:

AT+CGMM

The response should be the Telit module model number.

Verify the ﬁrmware version. Send:

AT+CGMR

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

Janus Remote Communications LTE910CF User manual

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