Ublox TOBY-L1 series Quick setup guide

TOBY-L1 series
LTE modules
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

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UBX-13001482 Objective Information
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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.
This document applies to the following products:
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.
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
1System 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
1.8.2SIM 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
2Design-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
3Handling 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
4Approvals....................................................................................................................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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5Product 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
AGlossary ......................................................................................................................81
Related documents...........................................................................................................83
Revision history................................................................................................................84
Contact..............................................................................................................................85

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1System 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.
Module
Region /
Operator
LTE
UMTS
GSM
GNSS
Interfaces
Audio
Features
LTE category
LTE bands
UMTS bands
GSM bands
GNSS receiver
CellLocate™
UART
USB 2.0
USB HSIC
RMII
SDIO
GPIO
Audio
MIMO 2x2
CSFB
VoLTE
Embedded TCP/UDP stack
Embedded HTTP, FTP, SSL
FOTA
TOBY-L100
Verizon
3
4, 13
1
6
•
•
TOBY-L110
Europe
3
3, 7, 20
1
6
•
•
Table 1: TOBY-L1 series main features summary
GPIOs are not supported by initial FW release. Check FW release schedule.

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Table 2 reports a summary of LTE characteristics of TOBY-L1 series modules.
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:
oBand 4: 1710 - 1755MHz (Tx), 2110 - 2155 MHz (Rx)
oBand 13:777 - 787 MHz (Tx), 746 - 756 MHz (Rx)
TOBY-L110:
oBand 3: 1710 - 1785 MHz (Tx), 1805 - 1880 MHz (Rx)
oBand 7: 2500 - 2570 MHz (Tx), 2620 - 2690 MHz (Rx)
oBand 20: 832 - 862 MHz (Tx), 791 - 821 MHz (Rx)
Channel bandwidth:
TOBY-L100
oBand 4: 1.4MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz
oBand 13: 10 MHz
TOBY-L110:
oBand 3: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz
oBand 7: 5 MHz, 10 MHz, 15 MHz, 20 MHz
oBand 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: 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
RF
Transceiver
ANT2
V_INT (I/O)
V_BCKP
VCC (Supply)
(U)SIM Card
USB
GPIO *
Power On
External Reset
PA
LNA Filter
Filter
Duplexer
Filter
PA
LNA Filter
Filter
Duplexer
Filter
LNA FilterFilter
LNA FilterFilter
Switch
Switch
Figure 1: TOBY-L100 block diagram
Wireless
Base-band
Processor
Memory
Power Management Unit
26 MHz
32.768 kHz
ANT1
RF
Transceiver
ANT2
V_INT (I/O)
V_BCKP
VCC
(Supply)
(U)SIM Card
USB
GPIO *
Power On
External Reset
PA
LNA Filter
Filter
Duplexer
Filter
PA
LNA Filter
Filter
Duplexer
Filter
LNA FilterFilter
LNA FilterFilter
LNA FilterFilter
PA
LNA Filter
Filter
Duplexer
Filter
Switch
Switch
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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1.3 Pin-out
Table 3 lists the pin-out of the TOBY-L1 series modules, with pins grouped by function.
Function
Pin Name
Module
Pin No
I/O
Description
Remarks
Power
VCC
All
70,71,72
I
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.
RF
ANT1
All
81
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
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.

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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
57
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
27
I/O
USB Data Line D-
90 Ωnominal 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
28
I/O
USB Data Line D+
90 Ωnominal 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.
GPIO
GPIO1
All
21
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
22
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
24
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
25
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
60
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
61
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, 62-
68, 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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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.
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.
Table 4: Module operating modes definition
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 idle-
mode.
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 idle-
mode 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 save-
mode from idle-mode by AT+UPSV=1
When the module is commanded to disable power save-
mode 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.

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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
Table 5: Module operating modes description
Figure 3 describes the transition between the different operating modes.
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

Figure 3: Operating modes transition

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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.
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.
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]
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
RX
slot
unused
slot
unused
slot
TX
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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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..
~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
50
0
Time [ms]
Current [mA]
100
50
0
3-6 mA 7-18 mA
60-120 mA
PLL
Enabled
RX
Enabled
20-40 mA
DSP
Enabled
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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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.
ACTIVE MODE
7-18 mA
60-120 mA
0.47-2.12 s
Paging period
Time [s]
Current [mA]
100
50
0
Time [ms]
Current [mA]
100
50
0
7-18 mA
60-120 mA
RX
Enabled
20-40 mA
DSP
Enabled
7-18 mA
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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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.
Baseband
Processor
70
VCC
71
VCC
72
VCC
3
V_BCKP
Linear
LDO RTC
Power
Management
TOBY-L1
32 kHz
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.
Baseband
Processor
70
VCC
71
VCC
72
VCC
5
V_INT
Switching
Step-
Down
Digital I/O
Interfaces
Power
Management
TOBY-L1 series
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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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.
VCC
V_BCKP
PWR_ON
V_INT
Internal Reset
System State
BB Pads State
Internal reset →Operational Operational
OFF
ON
Tristate with a PD
Internal reset
Start-up
event
Start of interface
configuration
All interfaces
are configured
0 ms
6.5 ms
~5 s
4.5 ms
Figure 9: TOBY-L1 series power-on sequence description