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

LTE910CF Hardware User Manual

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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

2.85v Vo

Select

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.