Ublox TOBY-L1 Series, TOBY-L100, TOBY-L110 System Integration Manual

Abstract

This document describes the features and the system integration of TOBY-L1 series LTE wireless modules.

These modules are a complete and cost efficient 4G solution offering 100 Mb/s download, 50 Mb/s upload, and covering up to 3 LTE Bands in the compact TOBY form factor.

www.u-blox.com

35.6 x 24.8 x 2.6 mm

locate, communicate, accelerate

TOBY-L1 series

LTE modules

System Integration Manual

TOBY-L1 series - System Integration Manual

Document Information

Title

TOBY-L1 series

Subtitle

LTE modules

Document type

System Integration Manual

Document number

UBX-13001482

Document status

Objective Information

Document status information

Objective Specification

This document contains target values. Revised and supplementary data will be published later.

Advance Information

This document contains data based on early testing. Revised and supplementary data will be published later.

Preliminary

This document contains data from product verification. Revised and supplementary data may be published later.

Released

This document contains the final product specification.

Name

Type number

Firmware version

PCN / IN

TOBY-L100

TOBY-L100-00S-00

G0.V.00.00.08

TOBY-L110

TOBY-L110-00S-00

G0.EE.00.00.08

This document and the use of any information contained therein, is subject to the acceptance of the u-blox terms and conditions. They can be downloaded from www.u-blox.com. u-blox makes no warranties based on the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice. u-blox reserves all rights to this document and the information contained herein. Reproduction, use or disclosure to third parties without express permission is strictly prohibited. Copyright © 2013, u-blox AG. u-blox® is a registered trademark of u-blox Holding AG in the EU and other countries.

This document applies to the following products:

Trademark Notice

Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. All other registered trademarks or trademarks mentioned in this document are property of their respective owners.

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Preface

u-blox Technical Documentation

As part of our commitment to customer support, u-blox maintains an extensive volume of technical documentation for our products. In addition to our product-specific technical data sheets, the following manuals are available to assist u-blox customers in product design and development.

AT Commands Manual: This document provides the description of the supported AT commands by the

TOBY-L1 series modules to verify all implemented functionalities.

System Integration Manual: This manual provides hardware design instructions and information on how to

set up production and final product tests.

Application Note: document provides general design instructions and information that applies to all u-blox

Wireless modules. See Related documents section for a list of Application Notes related to your Wireless Module.

How to use this Manual

The TOBY-L1 series System Integration Manual provides the necessary information to successfully design and configure the u-blox wireless modules.

This manual has a modular structure. It is not necessary to read it from the beginning to the end. The following symbols are used to highlight important information within the manual:

An index finger points out key information pertaining to module integration and performance.

A warning symbol indicates actions that could negatively impact or damage the module.

Questions

If you have any questions about u-blox Wireless Integration:

 Read this manual carefully.  Contact our information service on the homepage http://www.u-blox.com  Read the questions and answers on our FAQ database on the homepage http://www.u-blox.com

Technical Support

Worldwide Web

Our website (www.u-blox.com) is a rich pool of information. Product information, technical documents and helpful FAQ can be accessed 24h a day.

By E-mail

Contact the closest Technical Support office by email. Use our service pool email addresses rather than any personal email address of our staff. This makes sure that your request is processed as soon as possible. You will find the contact details at the end of the document.

Helpful Information when Contacting Technical Support

When contacting Technical Support, have the following information ready:

 Module type (e.g. TOBY-L100) and firmware version  Module configuration  Clear description of your question or the problem  A short description of the application  Your complete contact details

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Contents

Preface ................................................................................................................................ 3

Contents .............................................................................................................................. 4

1 System description ....................................................................................................... 7

1.1 Overview .............................................................................................................................................. 7

1.2 Architecture .......................................................................................................................................... 9

1.2.1 Internal blocks ............................................................................................................................. 10

1.3 Pin-out ............................................................................................................................................... 11

1.4 Operating modes ................................................................................................................................ 13

1.5 Supply interfaces ................................................................................................................................ 15

1.5.1 Module supply input (VCC) ......................................................................................................... 15

1.5.2 2.5v supply output (V_BCKP) ....................................................................................................... 19

1.5.3 1.8v supply output (V_INT) .......................................................................................................... 19

1.6 System function interfaces .................................................................................................................. 20

1.6.1 Module power-on ....................................................................................................................... 20

1.6.2 Module power-off ....................................................................................................................... 21

1.6.3 Module reset ............................................................................................................................... 21

1.7 Antenna interface ............................................................................................................................... 23

1.7.1 Antenna RF interfaces (ANT1 / ANT2) ......................................................................................... 23

1.8 SIM interface ...................................................................................................................................... 23

1.8.1 SIM card interface ....................................................................................................................... 23

1.8.2 SIM card detection ...................................................................................................................... 23

1.9 Serial interfaces .................................................................................................................................. 25

1.9.1 USB ............................................................................................................................................. 25

1.10 General Purpose Input/Output (GPIO) ............................................................................................. 27

1.11 Reserved pins (RSVD) ...................................................................................................................... 27

1.12 System features............................................................................................................................... 28

1.12.1 Network indication ...................................................................................................................... 28

1.12.2 TCP/IP and UDP/IP ....................................................................................................................... 29

1.12.3 FTP .............................................................................................................................................. 29

1.12.4 HTTP ........................................................................................................................................... 29

1.12.5 SMTP ........................................................................................................................................... 29

1.12.6 Firmware upgrade Over The Air (FOTA) ....................................................................................... 29

1.12.7 Power saving ............................................................................................................................... 29

2 Design-in ..................................................................................................................... 31

2.1 Supply interfaces ................................................................................................................................ 32

2.1.1 Module supply (VCC) .................................................................................................................. 32

2.1.2 2.5v supply (V_BCKP) .................................................................................................................. 40

2.1.3 1.8v supply (V_INT) ...................................................................................................................... 41

2.2 System functions interfaces ................................................................................................................ 42

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2.2.1 Module power-on (PWR_ON) ...................................................................................................... 42

2.2.2 Module reset (RESET_N) .............................................................................................................. 43

2.3 Antenna interface ............................................................................................................................... 45

2.3.1 Antenna RF interface (ANT) ......................................................................................................... 45

2.4 SIM interface ...................................................................................................................................... 50

2.5 Serial interfaces .................................................................................................................................. 54

2.5.1 USB interface............................................................................................................................... 54

2.6 General Purpose Input/Output (GPIO) ................................................................................................. 56

2.7 Reserved pins (RSVD) .......................................................................................................................... 57

2.8 Module placement.............................................................................................................................. 57

2.9 Module footprint and paste mask ....................................................................................................... 58

2.10 Thermal guidelines .......................................................................................................................... 60

2.11 ESD guidelines ................................................................................................................................ 62

2.11.1 ESD immunity test overview ........................................................................................................ 62

2.11.2 ESD immunity test of u-blox TOBY-L1 series reference designs .................................................... 62

2.11.3 ESD application circuits ................................................................................................................ 63

2.12 Schematic for TOBY-L1 series module integration ........................................................................... 65

2.13 Design-in checklist .......................................................................................................................... 67

2.13.1 Schematic checklist ..................................................................................................................... 67

2.13.2 Layout checklist ........................................................................................................................... 68

2.13.3 Antenna checklist ........................................................................................................................ 68

3 Handling and soldering ............................................................................................. 69

3.1 Packaging, shipping, storage and moisture preconditioning ............................................................... 69

3.2 Soldering ............................................................................................................................................ 69

3.2.1 Soldering paste............................................................................................................................ 69

3.2.2 Reflow soldering ......................................................................................................................... 69

3.2.3 Optical inspection ........................................................................................................................ 71

3.2.4 Cleaning ...................................................................................................................................... 71

3.2.5 Repeated reflow soldering ........................................................................................................... 71

3.2.6 Wave soldering............................................................................................................................ 71

3.2.7 Hand soldering ............................................................................................................................ 71

3.2.8 Rework ........................................................................................................................................ 71

3.2.9 Conformal coating ...................................................................................................................... 71

3.2.10 Casting ........................................................................................................................................ 72

3.2.11 Grounding metal covers .............................................................................................................. 72

3.2.12 Use of ultrasonic processes .......................................................................................................... 72

4 Approvals .................................................................................................................... 73

4.1 Product certification approval overview ............................................................................................... 73

4.2 Federal Communications Commission and Industry Canada notice ..................................................... 74

4.2.1 Safety Warnings review the structure .......................................................................................... 74

4.2.2 Declaration of Conformity – United States only ........................................................................... 74

4.2.3 Modifications .............................................................................................................................. 74

4.3 R&TTED and European Conformance CE mark ................................................................................... 76

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5 Product Testing........................................................................................................... 77

5.1 u-blox in-series production test ........................................................................................................... 77

5.2 Test parameters for OEM manufacturer .............................................................................................. 77

5.2.1 “Go/No go” tests for integrated devices ...................................................................................... 78

5.2.2 Functional tests providing RF operation ....................................................................................... 78

Appendix .......................................................................................................................... 80

A Glossary ...................................................................................................................... 81

Related documents........................................................................................................... 83

Revision history ................................................................................................................ 84

Contact .............................................................................................................................. 85

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Module

Region /

Operator

LTE

UMTS

GSM

GNSS

Interfaces

Audio

Features

TOBY-L100

Verizon

4, 13 1 6 • • TOBY-L110

Europe

3, 7, 20

1 6 • •

1 System description

1.1 Overview

The TOBY-L1 series comprises LTE-only modules in the very small LGA form-factor (35.6 x 24.8 x 2.6 mm) that are easy to integrate in compact designs.

TOBY-L1 series wireless modules provide 4G LTE-only data communication supports up to three LTE-FDD bands:

 TOBY-L100 is designed for operation on the LTE Verizon network in North America (LTE bands 4, 13), and

meets the requirements of Verizon network certification for LTE only devices.

 TOBY-L110 is designed for operation on the LTE European networks (LTE bands 3, 7, 20), and meets the

requirements of European networks certification for LTE only devices.

LTE-only modules offer cost advantages compared to multi-mode (LTE/3G/2G) modules and are optimized for applications using only LTE networks. Additionally, the TOBY-L1 series modules are form-factor compatible with the popular u-blox wireless module families: this allows customers to take the maximum advantage of their hardware and software investments, and provides very short time-to-market.

The modules are dedicated for data transfer, supporting a high-speed USB 2.0 interface. With LTE Category 3 data rates of 100 Mb/s (downlink) and 50 Mb/s (uplink), the modules are ideal for applications requiring the highest data-rates and high-speed internet access. TOBY-L1 series modules are the perfect choice for consumer fixed-wireless terminals, mobile routers and gateways, and applications requiring video streaming. They are also optimally suited for industrial (M2M) applications, such as remote access to video cameras, digital signage, telehealth, security and surveillance systems.

TOBY-L1 series main features and interface are summarized in Table 1.

Table 1: TOBY-L1 series main features summary

GPIOs are not supported by initial FW release. Check FW release schedule.

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4G LTE Characteristics

3GPP Release 9 - Long Term Evolution (LTE) Evolved Universal Terrestrial Radio Access (E-UTRA) Frequency Division Duplex (FDD) Multi-Input Multi-Output (MIMO) 2 x 2 antenna support

Band support:

 TOBY-L100:

o Band 4: 1710 - 1755MHz (Tx), 2110 - 2155 MHz (Rx) o Band 13: 777 - 787 MHz (Tx), 746 - 756 MHz (Rx)

 TOBY-L110:

o Band 3: 1710 - 1785 MHz (Tx), 1805 - 1880 MHz (Rx) o Band 7: 2500 - 2570 MHz (Tx), 2620 - 2690 MHz (Rx) o Band 20: 832 - 862 MHz (Tx), 791 - 821 MHz (Rx)

Channel bandwidth:

 TOBY-L100

o Band 4: 1.4MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz o Band 13: 10 MHz

 TOBY-L110:

o Band 3: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz o Band 7: 5 MHz, 10 MHz, 15 MHz, 20 MHz o Band 20: 5 MHz, 10 MHz, 15 MHz, 20 MHz

Power class:

 Class 3 (+23 dBm)

Data rate:

 LTE category 3: up to 50 Mb/s Up-Link, 100 Mb/s Down-Link

Short Message Service (SMS):

 SMS via embedded IMS (IP Multimedia Subsystem)

Table 2 reports a summary of LTE characteristics of TOBY-L1 series modules.

Table 2: TOBY-L1 series LTE characteristics summary

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1.2 Architecture

Wireless

Base-band

Processor

Memory

Power Management Unit

26 MHz

32.768 kHz

ANT1

Transceiver

ANT2

V_INT (I/O)

V_BCKP

VCC (Supply)

(U)SIM Card

USB

GPIO *

Power On

External Reset

LNA Filter

Filter

Duplexer

Filter

LNA Filter

Filter

Duplexer

Filter

LNA FilterFilter

Switch

Wireless

Base-band

Processor

Memory

Power Management Unit

26 MHz

32.768 kHz

ANT1

Transceiver

ANT2

V_INT (I/O)

V_BCKP

VCC

(Supply)

(U)SIM Card

USB

GPIO *

Power On

External Reset

LNA Filter

Filter

Duplexer

Filter

LNA Filter

Filter

Duplexer

Filter

LNA FilterFilter

LNA Filter

Filter

Duplexer

Filter

Switch

TOBY-L1 series - System Integration Manual

Figure 1: TOBY-L100 block diagram

Figure 2: TOBY-L110 block diagram

* = GPIOs are not supported by initial FW release.

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1.2.1 Internal blocks

TOBY-L1 series modules consist of the following internal sections: RF, Baseband and Power Management.

RF section

The RF section is composed of RF transceiver, filters, LNAs, PAs, duplexers and antenna switches.

 FDD (frequency division duplex)RF transceiver performs modulation, up-conversion of the baseband I/Q

signals for TX, down-conversion and demodulation of the dual RF signals received. The RF transceiver contains:

automatically gain controlled direct conversion Zero-IF receiver, highly linear RF demodulator / modulator capable QPSK/16QAM/64QAM, Fractional-N Sigma-Delta RF synthesizer, VCO.

Tx signal is pre-amplified by RF transceiver, then connected to the primary antenna input/output port (ANT1) of the module via power amplifier (PA), band specific duplexer and antenna switch.

 Dual receiving paths are connected respectively to the primary (ANT1) and secondary (ANT2) antenna ports

via duplexer SAW (band pass) filters

 26 MHz crystal oscillator generates the clock reference in active-mode or connected-mode.

Baseband section

The Baseband section is composed of the following main elements:

 Baseband processors in a mixed signal ASIC, which integrates

microprocessor for control functions, DSP core for LTE Layer 1 and digital processing of Rx and Tx signal paths,

memory interface controller,

dedicated peripheral blocks for control of the USB, USIM and GPIO digital interfaces, analog front end interfaces to RF transceiver ASIC.

 Memory system, which includes NAND flash and LPDDR.

Power Management section

The Power Management section is composed of the following elements:

 Voltage regulators to derive all the system supply voltages from the module supply input VCC  Voltage sources for external use: V_BCKP and V_INT  Hardware power on  Hardware reset  Low power idle-mode support

TOBY-L1 series modules are provided with an internal 32.768 kHz crystal oscillator to provide the clock reference in the low power idle-mode, which can be set with power saving configuration enabled by the AT+UPSV command.

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Function

Pin Name

Module

Pin No

I/O

Description

Remarks

Power

VCC

All

70,71,72

Module supply input

VCC pins are internally connected each other. VCC supply circuit affects the RF performance and

compliance of the device integrating the module with applicable required certification schemes. See section 1.5.1 for functional description and requirements for the VCC module supply. See section 2.1.1 for external circuit design-in.

GND

All

2, 30, 32, 44, 46, 69, 73, 74, 76, 78, 79, 80, 82, 83, 85, 86, 88-90, 92-152

N/A

Ground

GND pins are internally connected each other. External ground connection affects the RF and thermal performance of the device. See section 1.5.1 for functional description. See section 2.1.1 for external circuit design-in.

V_BCKP

All 3 O

RTC supply output

V_BCKP = 2.5 V (typical) generated by internal regulator when valid VCC supply is present. See section 1.5.2 for functional description. See section 2.1.2 for external circuit design-in.

V_INT

All 5 O

Digital Interfaces supply output

V_INT = 1.8 V (typical) generated by internal regulator when the module is switched on. See section 1.5.3 for functional description. See section 2.1.3 for external circuit design-in.

System

PWR_ON

All

20 I Power-on input

High impedance input: input voltage level has to be properly fixed, e.g. adding an external pull-up resistor to the V_BCKP output pin

See section 1.6.1 for functional description. See section 2.2.1 for external circuit design-in.

RESET_N

All

23 I External reset input

It is internally pulled up to V_BCKP with a 10 k resistor. See section 1.6.3 for functional description. See section 2.2.2 for external circuit design-in.

ANT1

All

I/O

Primary antenna

Main Tx / Rx antenna interface. 50  nominal characteristic impedance. Antenna circuit affects the RF performance and

compliance of the device integrating the module with applicable required certification schemes. See section 1.7 for functional description and requirements for the antenna RF interface. See section 2.3 for external circuit design-in.

ANT2

All

87 I Secondary antenna

Rx only for the MIMO 2x2 configuration. 50  nominal characteristic impedance. Antenna circuit affects the RF performance and

1.3 Pin-out

Table 3 lists the pin-out of the TOBY-L1 series modules, with pins grouped by function.

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Function

Pin Name

Module

Pin No

I/O

Description

Remarks

SIM

VSIM

All

59 O SIM supply output

VSIM = 1.8 V / 3 V automatically generated according to the connected SIM type.

See section 1.8 for functional description. See section 2.4 for external circuit design-in.

SIM_IO

All

I/O

SIM data

Data input/output for 1.8 V / 3 V SIM Internal 4.7 k pull-up to VSIM. See section 1.8 for functional description. See section 2.4 for external circuit design-in.

SIM_CLK

All

56 O SIM clock

5 MHz clock output for 1.8 V / 3 V SIM See section 1.8 for functional description. See section 2.4 for external circuit design-in.

SIM_RST

All

58 O SIM reset

Reset output for 1.8 V / 3 V SIM See section 1.8 for functional description. See section 2.4 for external circuit design-in.

USB

USB_D-

All

I/O

USB Data Line D-

90 Ω nominal differential impedance (Z0) 30 Ω nominal common mode impedance (ZCM) Pull-up or pull-down resistors and external series resistors as required by the USB 2.0 high-speed specification [4] are part of the USB pad driver and need not be provided externally. See section 1.9.1 for functional description. See section 2.5.1 for external circuit design-in.

USB_D+

All

I/O

USB Data Line D+

GPIO

GPIO1

All

I/O

GPIO

1.8 V GPIO by default configured as pad disabled. See section 1.10 for functional description. See section 2.6 for external circuit design-in.

GPIO2

All

I/O

GPIO

1.8 V GPIO by default configured as pad disabled. See section 1.10 for functional description. See section 2.6 for external circuit design-in.

GPIO3

All

I/O

GPIO

1.8 V GPIO by default configured as pad disabled. See section 1.10 for functional description. See section 2.6 for external circuit design-in.

GPIO4

All

I/O

GPIO

1.8 V GPIO by default configured as pad disabled. See section 1.10 for functional description. See section 2.6 for external circuit design-in.

GPIO5

All

I/O

GPIO

1.8 V GPIO by default configured as pad disabled. See section 1.10 for functional description. See section 2.6 for external circuit design-in.

GPIO6

All

I/O

GPIO

1.8 V GPIO by default configured as pad disabled. See section 1.10 for functional description. See section 2.6 for external circuit design-in.

Reserved

RSVD

All

1, 4, 6-19, 26, 29, 31, 33-43, 45, 47-55, 6268, 75, 77, 84, 91

N/A

RESERVED pin

Leave unconnected. See section 2.7

Table 3: TOBY-L1 series modules pin definition, grouped by function

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General Status

Operating Mode

Definition Power-down

Not-Powered Mode

VCC supply not present or below operating range: module is switched off.

Power-Off Mode

VCC supply within operating range and module is switched off.

Normal Operation

Low Power-Mode

Module processor core runs with 32 kHz reference, that is generated by:

 The internal 32 kHz oscillator

Idle-Mode

Module processor core runs with 26 MHz reference generated by the internal oscillator.

Connected-Mode

Data Connection enabled and processor core runs with 26 MHz reference.

Operating Mode

Description

Transition between operating modes

Not-Powered Mode

Module is switched off. USB interface is not accessible.

When VCC supply is removed, the module enters not-powered mode.

When in not-powered mode, the module cannot be switched on by a low level on PWR_ON input.

When in not-powered mode, the module can be switched on after applying VCC supply (refer to 2.2.1) so that the module switches from not-powered to idlemode.

Power-Off Mode

Module is switched off: normal shutdown by an appropriate power-off event (refer to 1.6.2).

USB interface is not accessible.

When the module is switched off by an appropriate power-off event (refer to 1.6.2), the module enters power-off mode from idle-mode.

When in power-off mode, the module can be switched on by a low level on PWR_ON input from power-off to idle-mode.

When VCC supply is removed, the module switches from power-off mode to not-powered mode.

Idle-Mode

The module is ready to communicate with an external device by means of the USB interface unless power saving configuration is enabled by the AT+UPSV command

Power saving configuration is not enabled by default: it can be enabled by the AT+UPSV command (see TOBY- L1xx AT Commands Manual [2]).

When the module is switched on by an appropriate power-on event (refer to 2.2.1), the module enters idlemode from not-powered or power-off mode.

If power saving is enabled the module can transition from Idle-Mode to Power save-mode (refer to the TOBY- L1xx AT Commands Manual [2], AT+UPSV).

When a data Connection is initiated, the module switches from idle-mode to connected-mode.

Power Save-Mode

The module is ready to communicate with an external device by means of the USB interface

Power saving configuration is not enabled by default: it can be enabled by the AT+UPSV command (see TOBY- L1xx AT Commands Manual [2]).

When the module is commanded to enter power savemode from idle-mode by AT+UPSV=1

When the module is commanded to disable power savemode by AT+UPSV=0

Connected-Mode

A data connection is in progress. The module is ready to communicate with an external

device by means of the USB interface unless power saving configuration is enabled by the AT+UPSV command (TOBY-L1xx AT Commands Manual [2]).

When a data connection is initiated, the module enters connected-mode from idle-mode.

When a data connection is terminated, the module returns to the idle-mode.

1.4 Operating modes

TOBY-L1 modules have several operating modes. The operating modes are defined in Table 4 and described in details in Table 5, providing general guidelines for operation.

Table 4: Module operating modes definition

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Operating Mode

Description

Transition between operating modes

Airplane-Mode

The module is ready to communicate with an external device by means of the USB interface.

The module cannot register or connect to network. Purpose is to inhibit RF reception and transmission.

When the module is commanded to enter airplane-mode from idle-mode by AT+CFUN=0

When the module is commanded to leave airplane-mode by AT+CFUN=1

Apply VCC

If power saving is enabled and there is no activity for a defined time interval

Any wake up event described

in the module operating

modes summary table above

Incoming/outgoing connection

Connection terminated,

communication dropped

Remove VCC

Switch ON: PWR_ON

Not

powered

Power off

IdleConnected

Power

Save

Switch OFF: AT+CPWROFF

Airplane



Table 5: Module operating modes description

Figure 3 describes the transition between the different operating modes.

Figure 3: Operating modes transition

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Item

Requirement

Remark

VCC nominal voltage

Within VCC normal operating range:

3.4 V min. / 4.50 V max.

The module cannot be switched on if VCC voltage value is below the normal operating range minimum limit. Ensure that the input voltage at VCC pins is above the minimum limit of the normal operating range for at least 1 second before the module switch-on.

VCC average current

Considerably withstand maximum average current consumption value in connected-mode conditions specified in TOBY-L1 series Data Sheet [1].

The maximum average current consumption can be greater than the specified value according to the actual antenna mismatching, temperature and VCC voltage.

Chapter 1.5.1.2 describes connected-mode current.

1.5 Supply interfaces

1.5.1 Module supply input (VCC)

TOBY-L1 modules must be supplied via the three VCC pins that represent the module power supply input. The VCC pins are internally connected to the integrated Power Management Unit. All supply voltages needed by

the module are generated from the VCC supply by integrated voltage regulators, including V_BCKP supply, V_INT digital interface supply and VSIM SIM card supply.

During operation, the current drawn by the TOBY-L1 series modules through the VCC pins can vary by several orders of magnitude. This range from the high peak of current consumption during LTE transmission bursts at maximum power level in connected-mode (as described in the chapter 1.5.1.2), to the low current consumption during low power save-mode with power saving enabled (as described in the chapter 1.5.1.3).

1.5.1.1 VCC supply requirements

Table 6 summarizes the requirements for the VCC module supply. Refer to chapter 2.1.1 for all the suggestions to properly design a VCC supply circuit compliant to the requirements listed in Table 6.

The VCC supply circuit affects the RF compliance of the device integrating TOBY-L1 series

module with applicable required certification schemes as well as antenna circuit design. Compliance is guaranteed if the VCC requirements summarized in the Table 6 are fulfilled.

Table 6: Summary of VCC supply requirements

1.5.1.2 VCC current consumption in connected-mode

When a LTE connection is established, the VCC consumption is determined by the current consumption profile typical of the LTE transmitting and receiving bursts.

The current consumption peak during a transmission slot is strictly dependent on the transmitted power, which is reflected by the network conditions.

Figure 4 shows an example of the module current consumption profile versus time in LTE connected-mode.

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Time [ms]

slot

unused

slot

unused

slot

unused

slot

unused

slot

MON

slot

unused

slot

unused

slot

unused

slot

unused

slot

unused

slot

MON

slot

unused

slot

GSM frame

4.615 ms

(1 frame = 8 slots)

Current [A]

200 mA

60-120 mA

1900 mA

Peak current

depends on

TX power

GSM frame

4.615 ms

(1 frame = 8 slots)

1.5

1.0

0.5

0.0

2.0

60-120 mA

10-40 mA

Figure 4: VCC current consumption profile versus time during a LTE Connection (1 TX slot, 1 RX slot)

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~30 ms

IDLE MODE ACTIVE MODE IDLE MODE

400-700 µA

Active Mode

Enabled

Idle Mode

Enabled

400-700 µA

60-120 mA

0.44-2.09 s

IDLE MODE

~30 ms

ACTIVE MODE

Time [s]

Current [mA]

100

Time [ms]

Current [mA]

100

3-6 mA

7-18 mA

60-120 mA

PLL

Enabled

20-40 mA

DSP

Enabled

1.5.1.3 VCC current consumption in power save-mode (power saving enabled)

The power saving configuration is by default disabled, but it can be enabled using the appropriate AT command (refer to TOBY-L1xx AT Commands Manual [2], AT+UPSV command). When power saving is enabled, the module automatically enters power save-mode whenever possible, reducing current consumption.

During power save-mode, the module processor runs with 32 kHz reference clock frequency. When power saving is enabled, the module is registered or attached to a network and a data Connection is not

enabled, the module automatically enters power save-mode whenever possible, but it must periodically monitor the paging channel of the current base station (paging block reception), in accordance to LTE system requirements. When the module monitors the paging channel, it wakes up to idle-mode, to enable the reception of paging block. In between, the module switches to power save-mode..

Figure 5: Description of VCC current consumption profile versus time when the module is registered the network: the module is in idle-mode and periodically wakes up to active-mode to monitor the paging channel for paging block reception

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ACTIVE MODE

7-18 mA

60-120 mA

0.47-2.12 s

Paging period

Time [s]

Current [mA]

100

Time [ms]

Current [mA]

100

7-18 mA

60-120 mA

Enabled

20-40 mA

DSP

Enabled

7-18 mA

1.5.1.4 VCC current consumption in fixed active-mode (power saving disabled)

Power saving configuration is by default disabled, or it can be disabled using the appropriate AT command (refer to TOBY-L1xx AT Commands Manual [2], AT+UPSV command). When power saving is disabled, the module does not automatically enter power save-mode whenever possible: the module remains in idle-mode.

The module processor core is activated during idle-mode, and the 26 MHz reference clock frequency is used. Figure 6 shows an example of the module current consumption profile when power saving is disabled: the

module is registered with the network, idle-mode is maintained, and the receiver and the DSP are periodically activated to monitor the paging channel for paging block reception.

Figure 6: Description of the VCC current consumption profile versus time when power saving is disabled: the active-mode is always held, and the receiver and the DSP are periodically activated to monitor the paging channel for paging block reception

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Baseband

Processor

VCC

V_BCKP

Linear

LDO

RTC

Power

Management

TOBY-L1

32 kHz

Baseband Processor

VCC

V_INT

Switching

StepDown

Digital I/O

Interfaces

Power Management

TOBY-L1 series

1.5.2 2.5V Supply Output (V_BCKP)

The V_BCKP pin of TOBY-L1 modules connected to internal 2.5v supply for customer use. This supply is internally generated by a linear LDO regulator integrated in the Power Management Unit, as shown in Figure 7. The output of this linear regulator is always enabled when the main voltage supply provided to the module through the VCC pins is within the valid operating range.

Figure 7: TOBY-L1 series (V_BCKP) simplified block diagram

1.5.3 1.8V Supply Output (V_INT)

The 1.8 V voltage supply used internally to source the digital interfaces of TOBY-L1 modules is also available on the V_INT supply output pin, as described in Figure 8.

Figure 8: TOBY-L1 series interfaces supply output (V_INT) simplified block diagram

The internal regulator that generates the V_INT supply is a switching step-down converter that is directly supplied from VCC. The voltage regulator output is set to 1.8 V (typical) when the module is switched on and it is disabled when the module is switched off.

The switching regulator operates in Pulse Width Modulation (PWM) for greater efficiency at high output loads when the module is in connected-mode. When the module is in low power save-mode between paging periods and with power saving configuration enabled by the appropriate AT command, it automatically switches to a power save mode for greater efficiency at low output loads. Refer to the TOBY-L1xx AT Commands Manual [2], +UPSV command.

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VCC

V_BCKP

PWR_ON

V_INT

Internal Reset

System State

BB Pads State

Internal reset → Operational Operational

OFF

Tristate with a PD

Internal reset

Start-up

event

Start of interface

configuration

All interfaces

are configured

4.5 ms

1.6 System function interfaces

1.6.1 Module power-on

The power-on sequence of TOBY-L1 series modules is initiated by

 Low level on the PWR_ON pin (normally high with external pull-up) for an appropriate time period.

1.6.1.1 Low level on PWR_ON

When a TOBY-L1 module is in the power-off mode (i.e. switched off with valid VCC supply maintained), the module can be switched on by forcing a low level on the PWR_ON input pin for at least 5 seconds.

The input voltage thresholds are tolerant of voltages up to the module supply level. The detailed electrical characteristics are described in TOBY-L1 series Data Sheet [1].

There is no internal pull-up resistor on the PWR_ON pin: the pin has high input impedance and is weakly pulled to the high level by the internal circuit. Therefore the external circuit must be able to hold the high logic level stable, e.g. providing an external pull-up resistor (for further design-in guidelines refer to chapter 2.2.1).

1.6.1.2 Additional considerations

The module can be switched on from power-off mode by forcing a proper start-up event (e.g. PWR_ON low). After the detection of a start-up event, all the module digital pins are held in tri-state until all the internal LDO voltage regulators are turned on in a defined power-on sequence. Anyway it is highly suggested to not force any logical state at pins input to avoid latch-up situations before the module is operational.

Then, as described in Figure 9, the baseband core is still held in reset state for a time interval: the internal reset signal (which is not available on a module pin) is still low and all the digital pins of the module are held in reset state. The reset state of all the digital pins is reported in the pin description table of TOBY-L1 Series Data Sheet [1]. When the internal signal is released, the configuration of the module interfaces starts: during this phase any digital pin is set in a proper sequence from the reset state to the default operational configuration.

After the internal reset is at high level, interface configuration sequence starts at that time we have to ensure low level on the PWR_ON for 5 seconds (worst case). Finally, the module is fully ready to operate when all interfaces are configured.

Figure 9: TOBY-L1 series power-on sequence description

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VCC

V_BCKP

RESET_N

PWR_ON

V_INT

Internal Reset

System State

BB Pads State Operational

OFF

Tristate with a PD

Operational → Tristate with a PD

RESET_N set low

value

~110 ms

Power off

The Internal Reset signal is available as soon as low level on PWR_ON pin is applyed, you can also monitor

the V_INT pin to sense start of the TOBY-L1 series power-on sequence.

1.6.2 Module power-off

An under-voltage shutdown occurs on TOBY-L1 modules when the VCC supply is removed, but in this case the current parameter settings are not saved in the module’s non-volatile memory and a proper network detach cannot be performed.

Figure 10 describes the power-off sequence by means of low level on RESET_N pin (normally high by internal pull-up). At the end of the switch-off routine, all digital pins are locked in tri-state by the module and all the internal LDO voltage regulators except V_BCKP are turned off in a defined power-off sequence. The module remains in power off mode as long as a switch on event does not occur (i.e. applying a low level on the

PWR_ON pin), and enters not-powered mode if the supply is removed from the VCC pin.

Figure 10: TOBY-L1 series power-off sequence description

1.6.3 Module reset

A TOBY-L1 module reset can be performed in one of two ways. RESET_N input pin: Forces a low level on the RESET_N input pin, causing an “external” or “hardware” reset.

This must be low for at least xx ms. This causes an asynchronous reset of the module baseband processor, excluding the integrated Power Management Unit. The V_INT interfaces supply is enabled and each digital pin is set in its reset state, the V_BCKP supply is enabled. Forcing an “external” or “hardware” reset, the current parameter settings are not saved in the module’s non-volatile memory and a proper network detach is not performed.

AT+CFUN command (refer to the TOBY-L1xx AT Commands Manual [2] for more details): This command causes an “internal” or “software” reset, which is an asynchronous reset of the module baseband processor. The electrical behavior is the same as that of the “external” or “hardware” reset, but in an “internal” or “software” reset the current parameter settings are saved in the module’s non-volatile memory and a proper network detach is performed.

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Baseband

Processor

RESET_N

Reset Input

TOBY-L1 series

10k

2.5 V

After either reset, when RESET_N is released from the low level, the module automatically starts its power-on sequence from the reset state.

The reset state of all digital pins is reported in the pin description table in TOBY-L1 series Data Sheet [1].

As described in Figure 11, the module has an internal pull-up resistor which pulls the line to the high logic level when the RESET_N pin is not forced low from the external. Detailed electrical characteristics are described in TOBY-L1 series Data Sheet [1].

Figure 11: TOBY-L1 series reset input (RESET_N) description

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Item

Requirements

Remarks

Impedance

50  nominal characteristic impedance

The impedance of the antenna RF connection must match the 50  impedance of the ANT pin.

Frequency Range

Module dependent

The required frequency range of the antenna depends on the operating bands of the used TOBY-L1 module and the used Mobile Network.

V.S.W.R Return Loss

< 2:1 recommended, < 3:1 acceptable S11 < -10 dB recommended, S11 < -6 dB acceptable

The impedance of the antenna termination must match as much as possible the 50  impedance of the ANT pin over the operating frequency range.

Input Power

> 1 W peak

The antenna termination must withstand the maximum peak of power transmitted by TOBY-L1 modules.

Gain

Below the levels reported in the chapter 4.2.2

The antenna gain must not exceed the herein specified value to comply with regulatory agencies radiation exposure limits.

1.7 Antenna interface

1.7.1 Antenna RF interfaces (ANT1 / ANT2)

The ANT pins of TOBY-L1 modules represents the RF input/output for transmission and reception of the LTE RF signals. The ANT pin has a nominal characteristic impedance of 50  and must be connected to the antenna through a 50  transmission line to allow proper RF transmission and reception in operating bands.

1.7.1.1 Antenna RF interface requirements

Table 7 summarizes the requirements for the antenna RF interface (ANT). Refer to section 2.3.1 for suggestions to properly design an antenna circuit compliant to these requirements.

The antenna circuit affects the RF compliance of the device integrating TOBY-L1 series module

with applicable required certification schemes. Compliance is guaranteed if the antenna RF interface (ANT1 / ANT2 ) requirements summarized in Table 7 are fulfilled.

Table 7: Summary of antenna RF interface (ANT) requirements

1.8 SIM interface

1.8.1 SIM card interface

TOBY-L1 modules provide high-speed SIM/ME interface including automatic detection and configuration of the voltage required by the connected SIM card or chip.

Both 1.8 V and 3 V SIM types are supported: activation and deactivation with automatic voltage switch from

1.8 V to 3 V is implemented, according to ISO-IEC 7816-3 specifications. The VSIM supply output pin provides internal short circuit protection to limit start-up current and protect the device in short circuit situations.

The SIM driver supports the PPS (Protocol and Parameter Selection) procedure for baud-rate selection, according to the values determined by the SIM Card.

SIM Application Toolkit (R99) is supported.

1.8.2 SIM card detection

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The SIM card detection function determined via firmware after power on of module.

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Name

Description

Remarks

USB_D+

USB Data Line D+

90 Ω nominal differential characteristic impedance (Z0) 30 Ω nominal common mode characteristic impedance (ZCM) Pull-up or pull-down resistors and external series resistors as required by the USB 2.0 high-speed specification [4] are part of the USB pad driver and need not be provided externally.

USB_D-

USB Data Line D-

1.9 Serial interfaces

TOBY-L1 series modules provide the following serial communication interface:

 USB interface: 4-wire

1.9.1 USB

TOBY-L1 modules provide a high-speed USB interface at 480 Mb/s compliant with the Universal Serial Bus Revision 2.0 specification [4]. It acts as a USB device and can be connected to any USB host such as a PC or other

Application Processor. The USB-device shall look for all upper-SW-layers like any other serial device. This means that TOBY-L series

modules emulate all serial control logical lines.

Table 8: USB pins

The USB interface pins ESD sensitivity rating is 1 kV (Human Body Model according to JESD22-A114F).

Higher protection level could be required if the lines are externally accessible on the application board. Higher protection level can be achieved by mounting a very low capacitance (i.e. less or equal to 1 pF) ESD protection (e.g. Tyco Electronics PESD0402-140 ESD protection device) on the lines connected to these pins, close to accessible points.

1.9.1.1 USB features

TOBY-L1 modules simultaneously supports 3 USB CDC (Communications Device Class) that assure multiple functionalities to the USB physical interface. The 3 available CDCs are configured as described in the following list:

 USB1: Remote NDIS based Internet Sharing Device ( Ethernet connection )  USB2: Gadget Serial ( AT Commands )  USB3: Multifunction Gadget with multiple configurations

The module firmware can be upgraded over the USB interface using the u-blox EasyFlash tool Firmware Update Application Note [11]).

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USB CDC/ACM drivers are available for the following operating system platforms:

 Windows XP  Windows 7  Standard Linux/Android USB kernel drivers

TOBY-L1 module identifies itself by its VID (Vendor ID) and PID (Product ID) combination, included in the USB device descriptor.

VID and PID of TOBY-L1 modules are the following:

 VID = 0x1546  PID = 0x1131 for TOBY-L100 series  PID = 0x1131 for TOBY-L110 series

1.9.1.2 USB and power saving

If power saving is enabled by AT command (AT+UPSV=1), the TOBY-L1 module automatically enters the USB suspended state when the device has observed no bus traffic for a specified period (refer to the Universal Serial Bus Revision 2.0 specification [4]). In suspended state, the module maintains any internal status as USB device, including its address and configuration. In addition, the module enters the suspended state when the hub port it is attached to is disabled: this is referred to as USB selective suspend. The module exits suspend mode when there is bus activity.

TOBY-L1 module is capable of USB remote wake-up signaling: i.e. may request the host to exit suspend mode or selective suspend by using electrical signaling to indicate remote wake-up. This notifies the host that it should resume from its suspended mode, if necessary, and service the external event that triggered the suspended USB device to signal the host. Remote wake-up is accomplished using electrical signaling described in the Universal Serial Bus Revision 2.0 specification [4].

When the USB enters suspended state, the average VCC module current consumption of TOBY-L1 module is ~400 µA higher then when the USB is not attached to a USB host.

If power saving is disabled by AT+UPSV=0 and the TOBY-L1 module is attached to a USB host as USB device, is configured and is not suspended, the average VCC module current consumption in fixed active mode is increased to ~40 mA.

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Ublox TOBY-L1 Series, TOBY-L100, TOBY-L110 System Integration Manual

Specifications and Main Features

Frequently Asked Questions

User Manual