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LARA-R202
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Ublox LARA-R202, LARA-R281, LARA-R280, LARA-R220, LARA-R211 User manual

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UBX-16005783 - R27 C1-Public www.u-blox.com
LARA-R2 series
Size-optimized LTE Cat 1 modules in single and multi­mode configurations
Data sheet
Abstract
Technical data sheet describing the LARA-R2 series multi-mode cellular modules. The modules are a cost efficient and performance optimized LTE Cat 1 / 3G / 2G multi-mode solution covering up to four LTE bands, up to two UMTS/HSPA bands and up to two GSM/EGPRS bands in the very small and compact LARA form factor.
LARA-R2 series - Data sheet
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Document information

Title
LARA-R2 series
Subtitle
Size-optimized LTE Cat 1 modules in single and multi-mode configurations
Document type
Data sheet
Document number
UBX-16005783
Revision and date
R27
30-Mar-2021
Disclosure restriction
C1-Public
Product status
Corresponding content status
Functional sample
Draft
For functional testing. Revised and supplementary data will be published later.
In development / Prototype
Objective specification
Target values. Revised and supplementary data will be published later.
Engineering sample
Advance information
Data based on early testing. Revised and supplementary data will be published later.
Initial production
Early production information
Data from product verification. Revised and supplementary data may be published later.
Mass production / End of life
Production information
Document contains the final product specification.
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This document applies to the following products:
Product name
Type number
Modem version
Application version
PCN reference
Product status
LARA-R202
LARA-R202-02B-00
30.42
A01.00
UBX-17057959
Obsolete
LARA-R202-02B-01
30.42
A01.01
UBX-18018067
Obsolete
LARA-R202-02B-02
30.42
A01.02
UBX-18057549
Obsolete
LARA-R202-02B-03
30.44
A01.02
UBX-19011731
Mass production
LARA-R202-82B-00
30.53
A01.03
UBX-19043497
Mass production
LARA-R202-03B-00
30.55
A01.00
UBX-20027523
Mass production
LARA-R203
LARA-R203-02B-00
30.39
A01.00
UBX-17048311
Obsolete
LARA-R203-02B-01
30.39
A01.02
UBX-18018067
Obsolete
LARA-R203-02B-02
30.39
A01.03
UBX-18057549
Obsolete
LARA-R203-02B-03
30.41
A01.03
UBX-19011731
Mass production
LARA-R203-02B-34
30.54
A01.00
UBX-19056532
Mass production
LARA-R203-03B-00
30.55
A01.00
UBX-20027523
Mass production
LARA-R204
LARA-R204-02B-00
31.34
A01.00
UBX-17012269
Obsolete
LARA-R204-02B-02
31.40
A01.00
UBX-18046834
Mass production
LARA-R211
LARA-R211-02B-00
30.31
A01.00
UBX-17012270
Obsolete
LARA-R211-02B-01
30.49
A01.01
UBX-17054295
Obsolete
LARA-R211-02B-02
30.49
A01.02
UBX-18057549
End of life
LARA-R211-02B-03
30.49
A01.05
UBX-20012865
Mass production
LARA-R220
LARA-R220-62B-00
30.44
A01.03
UBX-17061668
Obsolete
LARA-R220-62B-01
30.44
A01.04
UBX-18050698
Obsolete
LARA-R220-62B-02
30.44
A01.05
UBX-18057549
Obsolete
LARA-R220-62B-03
30.44
A01.07
UBX-19029271
Mass production
LARA-R280
LARA-R280-02B-00
30.43
A01.01
UBX-17063950
Obsolete
LARA-R280-02B-01
30.43
A01.02
UBX-18018067
Obsolete
LARA-R280-02B-02
30.43
A01.03
UBX-18052020
Obsolete
LARA-R280-02B-03
30.43
A01.04
UBX-18057549
End of life
LARA-R280-02B-04
30.43
A01.06
UBX-19029271
Mass production
LARA-R281
LARA-R281-02B-00
30.49
A01.06
UBX-20035136
Mass production
u-blox or third parties may hold intellectual property rights in the products, names, logos and designs included in this document. Copying, reproduction, modification or disclosure to third parties of this document or any part thereof is only permitted with the express written permission of u-blox. The information contained herein is provided “as is” and u-blox assumes no liability for its use. No warranty, either express or implied, is given, including but not limited to, with respect to the accuracy, correctness, reliability and fitness for a particular purpose of the information. This document may be revised by u-blox at any time without notice. For the most recent documents, visit www.u-blox.com. Copyright © u-blox AG.
LARA-R2 series - Data sheet
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Contents

Document information ................................................................................................................................ 2
Contents .......................................................................................................................................................... 4
1 Functional description ......................................................................................................................... 6
1.1 Overview ........................................................................................................................................................ 6
1.2 Product features ......................................................................................................................................... 7
1.3 Block diagram .............................................................................................................................................. 8
1.4 Product description .................................................................................................................................... 8
1.5 AT command support ..............................................................................................................................10
1.6 Supported features ..................................................................................................................................10
2 Interfaces .............................................................................................................................................. 12
2.1 Power management .................................................................................................................................12
2.1.1 Module supply input (VCC) .............................................................................................................12
2.1.2 RTC supply input / output (V_BCKP) ............................................................................................12
2.1.3 Generic digital interfaces supply output (V_INT) .......................................................................12
2.2 Antenna interfaces ...................................................................................................................................12
2.2.1 Antenna RF interfaces .....................................................................................................................12
2.2.2 Antenna detection ............................................................................................................................12
2.3 System functions ......................................................................................................................................13
2.3.1 Module power-on ..............................................................................................................................13
2.3.2 Module power-off ..............................................................................................................................13
2.3.3 Module reset ......................................................................................................................................14
2.3.4 Module / host configuration selection ..........................................................................................14
2.4 SIM ...............................................................................................................................................................14
2.4.1 SIM interface .....................................................................................................................................14
2.4.2 SIM detection ....................................................................................................................................14
2.5 Serial communication ..............................................................................................................................15
2.5.1 Main UART interface ........................................................................................................................15
2.5.2 Auxiliary UART interface .................................................................................................................16
2.5.3 USB interface .....................................................................................................................................17
2.5.4 HSIC interface ...................................................................................................................................18
2.5.5 DDC (I2C) interface ...........................................................................................................................18
2.5.6 SDIO interface ...................................................................................................................................18
2.6 Audio ............................................................................................................................................................18
2.7 Clock output ...............................................................................................................................................19
2.8 GPIO .............................................................................................................................................................19
3 Pin definition ........................................................................................................................................ 20
3.1 Pin assignment ..........................................................................................................................................20
4 Electrical specifications ................................................................................................................... 25
4.1 Absolute maximum rating.......................................................................................................................25
4.1.1 Maximum ESD ...................................................................................................................................25
4.2 Operating conditions ................................................................................................................................26
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4.2.1 Operating temperature range ........................................................................................................26
4.2.2 Supply/power pins ............................................................................................................................26
4.2.3 Current consumption .......................................................................................................................27
4.2.4 LTE RF characteristics ....................................................................................................................28
4.2.5 3G RF characteristics ......................................................................................................................30
4.2.6 2G RF characteristics ......................................................................................................................30
4.2.7 ANT_DET pin ......................................................................................................................................31
4.2.8 PWR_ON pin .......................................................................................................................................31
4.2.9 RESET_N pin ......................................................................................................................................31
4.2.10 SIM pins ..............................................................................................................................................31
4.2.11 USB pins .............................................................................................................................................32
4.2.12 HSIC pins ............................................................................................................................................32
4.2.13 DDC (I2C) pins ....................................................................................................................................32
4.2.14 Generic Digital Interfaces pins .......................................................................................................33
4.3 Parameters for ATEX applications ........................................................................................................35
5 Mechanical specifications ............................................................................................................... 36
6 Qualification and approvals............................................................................................................. 37
6.1 Reliability tests ..........................................................................................................................................37
6.2 Approvals ....................................................................................................................................................37
7 Product handling & soldering .......................................................................................................... 38
7.1 Packaging ...................................................................................................................................................38
7.1.1 Reels ....................................................................................................................................................38
7.1.2 Tapes ...................................................................................................................................................39
7.2 Moisture sensitivity levels .......................................................................................................................40
7.3 Reflow soldering ........................................................................................................................................40
7.4 ESD precautions ........................................................................................................................................40
8 Default settings .................................................................................................................................. 41
9 Labeling and ordering information ............................................................................................... 42
9.1 Product labeling .........................................................................................................................................42
9.2 Explanation of codes ................................................................................................................................43
9.3 Ordering information ................................................................................................................................44
Appendix ....................................................................................................................................................... 45
A Glossary ................................................................................................................................................. 45
Related documentation ........................................................................................................................... 46
Revision history .......................................................................................................................................... 47
Contact .......................................................................................................................................................... 48
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1 Functional description

1.1 Overview

The LARA-R2 series comprises LTE Cat 1 / 3G / 2G multi-mode modules in the very small LARA LGA form-factor (26.0 x 24.0 mm, 100-pin) that are easy to integrate in compact designs.
LARA-R2 series modules support multi-band LTE-FDD Cat 1 radio access technology with seven regional variants. Each variant is designed for specific regional market requirements to allow development of cost efficient yet feature-rich products. The variants with 2G or 3G fallback provide connectivity in cases where LTE coverage is not yet available. This allows seamless operation during technology transition.
LARA modules are form-factor compatible with u-blox SARA, LISA and TOBY cellular module families: this facilitates easy migration from u-blox GSM/GPRS, CDMA, UMTS/HSPA, and other LTE modules, maximizes the investments of customers, simplifies logistics, and enables very short time-to-market.
The modules are ideal for applications that are transitioning to LTE from 2G and 3G, due to the long term availability and scalability of LTE networks.
With a range of interface options and an integrated IP stack, the modules are designed to support a wide range of data-centric applications. The unique combination of performance and flexibility make these modules ideally suited for medium speed M2M applications, such as smart energy gateways, remote access video cameras, digital signage, telehealth and telematics.
LARA-R2 series modules include product versions supporting Voice over LTE (VoLTE) and voice over 3G or 2G (CSFB) for applications that require voice, such as security and surveillance systems.
Thanks to the u-blox's CellLocate® technology, LARA-R2 series modules offer cost-effective location estimation based on information from surrounding cellular base stations. A positioning solution with CellLocate® and a u-blox GNSS module provides redundancy and accuracy that can be beneficial for numerous applications.
The temperature range of –40 °C to +85 °C guarantees operation in harsh environments and in very compact designs.
LARA-R2 modules are manufactured in ISO/TS 16949 certified sites, with the highest production standards and the highest quality and reliability. Each module is fully tested and inspected during production. Modules are qualified according to ISO 16750 – for systems installed in vehicles.
USB drivers and RIL software for Android are free of charge.
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1.2 Product features

Model
Region
Radio access
technology
Positioning
Interfaces
Audio
Features
Grade
LTE bands
1
UMTS bands GSM bands GNSS via modem AssistNow Software CellLocate® UART
USB 2.0 HISC * SDIO * DDC (I
2C)
GPIOs Analog audio Digital audio Network indication VoLTE Antenna supervisor
Embedded TCP/UDP stack Embedded HTTP,FTP,TSL
1.2
FW update via
serial
FOTA client Rx Diversity Dual stack IPv4 / IPv6 Standard Professional Automotive
LARA-R202
North
America
2,4
5,12
850
1900
● ● ●
22 1 1 1 1 9
● ● ●3 ● ● ● ● ● ●
● ●
LARA-R203
North
America
2,4,12
● ● ●
22 1 1 1 1 9
● ● ●3 ● ● ● ● ● ●
● ●
LARA-R204
North
America
4,13 1 1 1 1 1 9
●
● ● ● ● ● ● ● ●
LARA-R211
EMEA
3,7,20
900
1800
●4
●4
●4
25 1 1 1 1 9
● ● ● ● ● ● ● ● ●
● ●
LARA-R220
Japan
1,19
● ● ●
1 1 1 1 1 9
●
● ● ● ● ● ● ● ●
LARA-R280
APAC
3,8,28
2100
● ● ●
1 1 1 1 1 9
● ● ■ ● ● ● ● ● ●
● ●
LARA-R281
EMEA
1,3,8
20,28
2100
● ● ●
1 1 1 1 1 9
● ● ■ ● ● ● ● ● ●
● ●
● = Available in any firmware
■ = CSFB only
* = HW ready
Table 1: LARA-R2 series main features summary
1
LTE band 12 is a superset including band 17: LTE band 12 is supported along with Multi-Frequency Band Indicator (MFBI)
2
Second UART not supported by LARA-R202-02B, LARA-R202-82B, or LARA-R203-02B product versions
3
AT&T certified with VoLTE
4
External GNSS control via modem, AssistNow Software and CellLocate® are not supported by LARA-R211-02B-00
5
Second UART is not supported by LARA-R211-02B-00, LARA-R211-02B-01, or LARA-R211-02B-02 product versions
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1.3 Block diagram

Cellular
Base-band
processor
Memory
Power Management Unit
26 MHz
32.768 kHz
ANT1
RF
transceiver
ANT2
V_INT (I/O)
V_BCKP (RTC)
VCC (Supply)
SIM
USB
HSIC
Power On
External Reset
PAs
LNAsFilters
Filter
s
Duplexer
Filters
PAs
LNAsFilter
s
Filter
s
Duplexer
Filters
LNAsFilter
s
Filters
LNAsFiltersFilter
s
Switch
Switch
DDC (I2C)
SDIO
UART
ANT_DET
Host Select
GPIO
Digital audio (I2S)
Figure 1: LARA-R2 series block diagram
☞ The "02B", "62B", "82B", and "03B" product versions of u-blox LARA-R2 series modules (meaning
the LARA-R202-02B, LARA-R202-82B, LARA-R202-03B, the LARA-R203-02B, LARA-R203-03B, the LARA-R204-02B, the LARA-R211-02B, the LARA-R220-62B, the LARA-R280-02B, and the LARA-R281-02B) do not support the following interfaces, which can be left unconnected and should not be driven by external devices:
o HSIC interface o SDIO interface o HOST_SELECT pin

1.4 Product description

LARA-R2 series modules provide LTE Cat 1 radio access technology, some variants with 2G or 3G multi-mode fallback.
• LARA-R202 is designed mainly for operation in America (on LTE and 3G networks)
• LARA-R203 is designed mainly for operation in America (on LTE networks)
• LARA-R204 is designed mainly for operation in America (on Verizon LTE network)
• LARA-R211 is designed mainly for operation in EMEA on LTE and 2G networks
• LARA-R220 is designed mainly for operation in Japan (on NTT DoCoMo LTE network)
• LARA-R280 is designed mainly for operation in APAC on LTE and 3G networks
• LARA-R281 is designed mainly for operation in EMEA on LTE and 3G networks
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4G LTE
3G UMTS/HSDPA/HSUPA
2G GSM/GPRS/EDGE
3GPP Release 9 Long Term Evolution (LTE) Evolved UTRA (E-UTRA) Frequency Division Duplex (FDD) DL Rx diversity
3GPP Release 9 High Speed Packet Access (HSPA) UMTS Terrestrial Radio Access (UTRA) Frequency Division Duplex (FDD) DL Rx Diversity
3GPP Release 9 Enhanced Data rate GSM Evolution (EDGE) GSM EGPRS Radio Access (GERA) Time Division Multiple Access (TDMA) DL Advanced Rx Performance Phase 1
Band support6:
• LARA-R202:
• Band 12 (700 MHz)
7
• Band 5 (850 MHz)
• Band 4 (1700 MHz)
• Band 2 (1900 MHz)
Band support:
• LARA-R202:
• Band 5 (850 MHz)
• Band 2 (1900 MHz)
Band support:
• LARA-R203:
• Band 12 (700 MHz)
7
• Band 4 (1700 MHz)
• Band 2 (1900 MHz)
• LARA-R204:
• Band 13 (700 MHz)
• Band 4 (1700 MHz)
• LARA-R211:
• Band 20 (800 MHz)
• Band 3 (1800 MHz)
• Band 7 (2600 MHz)
• LARA-R211:
• E-GSM 900 MHz
• DCS 1800 MHz
• LARA-R220:
• Band 19 (850 MHz)
• Band 1 (2100 MHz)
• LARA-R280:
• Band 28 (700 MHz)
• Band 8 (900 MHz)
• Band 3 (1800 MHz)
• LARA-R280:
• Band 1 (2100 MHz)
• LARA-R281:
• Band 28 (700 MHz)
• Band 20 (800 MHz)
• Band 8 (900 MHz)
• Band 3 (1800 MHz)
• Band 1 (2100 MHz)
• LARA-R281:
• Band 1 (2100 MHz)
LTE Power Class
• Power Class 3 (23 dBm)
UMTS/HSDPA/HSUPA Power Class
• Class 3 (24 dBm)
GSM/GPRS (GMSK) Power Class
• Power Class 4 (33 dBm) for E-GSM band
• Power Class 1 (30 dBm) for DCS band
EDGE (8-PSK) Power Class
• Power Class E2 (27 dBm) for E-GSM band
• Power Class E2 (26 dBm) for DCS band
Data rate
• LTE category 1:
up to 10.3 Mbit/s DL, up to 5.2 Mbit/s UL
Data rate
• HSDPA category 8:
up to 7.2 Mbit/s DL
• HSUPA category 6:
up to 5.76 Mbit/s UL
Data rate8
• GPRS multi-slot class 33
9
, CS1-CS4,
up to 107 kbit/s DL, up to 85.6 kbit/s UL
• EDGE multi-slot class 33
9
, MCS1-MCS9,
up to 296 kbit/s DL, up to 236.8 kbit/s UL
Table 2: LARA-R2 series LTE, 3G and 2G characteristics
LARA-R2 modules provide Voice over LTE (VoLTE)10 as well as Circuit-Switched-Fall-Back (CSFB)11 audio capability.
6
LARA-R2 modules support all E-UTRA channel bandwidths for each operating band according to 3GPP TS 36.521-1 [11]
7
LTE band 12 is a superset including band 17: LTE band 12 is supported along with Multi-Frequency Band Indicator feature
8
GPRS/EDGE multislot class determines the number of timeslots available for upload and download and thus the speed at
which data can be transmitted and received, with higher classes typically allowing faster data transfer rates.
9
GPRS/EDGE multislot class 33 implies a maximum of 5 slots in DL (reception), 4 slots in UL (transmission) with 6 slots in total.
10
Not supported by LARA-R204-02B, LARA-R220-62B, LARA-R280-02B and LARA-R281-02B modules product versions.
11
Not supported by LARA-R203-02B, LARA-R203-03B, LARA-R204-02B and LARA-R220-62B modules product versions.
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1.5 AT command support

The LARA-R2 series modules support AT commands according to 3GPP standards TS 27.007 [7], TS 27.005 [8] and the u-blox AT command extension.
☞ For the complete list of all supported AT commands and their syntax, see the u-blox AT commands
manual [1].
RIL (Radio Interface Layer) software for Android and Embedded Windows is available for LARA-R2 series modules free of charge; see the Android RIL source code application note [3] for the supported software deliveries and more information.

1.6 Supported features

Table 3 lists some of the main features supported by LARA-R2 series. For more details, see LARA-R2
series system integration manual [2] and u-blox AT commands manual [1].
Feature
Description
Network indication
GPIO configured to indicate the network status: registered home network, registered roaming, voice or data call enabled, no service. The feature can be enabled through the +UGPIOC AT command.
Antenna detection
The ANT_DET pin provides antenna presence detection capability, evaluating the resistance from ANT1 and ANT2 pins to GND by means of an external antenna detection circuit implemented on the application board. The antenna detection feature can be enabled through the +UANTR AT command.
Embedded TCP and UDP stack
Embedded TCP/IP and UDP/IP stack including direct link mode for TCP and UDP sockets. Sockets can be set in Direct Link mode to establish a transparent end to end communication with an already connected TCP or UDP socket via serial interface.
FTP, FTPS
File Transfer Protocol as well as Secure File Transfer Protocol (SSL encryption of FTP control channel) functionalities are supported by means of AT commands.
HTTP, HTTPS
Hyper-Text Transfer Protocol and Secure Hyper-Text Transfer Protocol (SSL encryption) functions are supported via AT commands. HEAD, GET, POST, DELETE and PUT operations are available.
Embedded TLS 1.2
With the support of X.509 certificates, Embedded TLS 1.2 provides server and client authentication, data encryption, data signature and enables TCP/IP applications like HTTPS and FTPS to communicate over a secured and trusted connection.
The feature can be configured and enabled by +USECMNG and +USECPRF AT commands.
DNS
Support for DNS functionality.
IPv4/Ipv6 dual-stack
Can move between Ipv4 and dual stack network infrastructures. Ipv4 and Ipv6 addresses can be used.
PPP
Ipv4/Ipv6 packets relaying through the cellular protocol stack performed on a Point-to-Point Protocol connection established with the external application via a serial interface (UART, MUX, or CDC-ACM). Transitions between Online command mode (OLCM) and PPP mode are supported.
BIP
Bearer Independent Protocol for Over-the-Air SIM provisioning. The data transfer to/from the SIM uses either an already active PDP context or a new PDP context established with the APN provided by the SIM card.
Multiple PDP contexts
Up to 8 PDP contexts can be activated, and multi secondary PDP contexts be associated to a primary PDP context.
VoLTE12 and CSFB13 audio capability
Voice over LTE (VoLTE) feature allows voice service over LTE bearer, via embedded IP Multimedia Subsystem (IMS).
Circuit Switched Fall-Back (CSFB) feature allows voice service over circuit switched infrastructure (3G or 2G).
Firmware update Over AT commands (FOAT)
Firmware module update over AT command interfaces. The feature can be enabled and configured through the +UFWUPD AT command.
Firmware update Over The Air (FOTA)
Embedded FOTA client to enable the Firmware module update over the cellular air interface. The feature can be enabled and configured through the +UFWINSTALL AT command.
12
Not supported by LARA-R204-02B, LARA-R220-62B, LARA-R280-02B and LARA-R281-02B modules product version.
13
Not supported by LARA-R203-02B, LARA-R203-03B, LARA-R204-02B, and LARA-R220-62B modules product version.
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Feature
Description
LTE / 3G Rx Diversity
Improved cellular link quality and reliability on all operating bands, by means of 2 receiving antenna inputs.
GNSS via modem14
Full access to u-blox positioning chips and modules is available through a dedicated DDC (I2C) interface. This means that from any host processor, a single serial port can control the cellular module and the u-blox M8 positioning chip or module. For more details, see the GNSS implementation application note [4].
Embedded AssistNow Software14
Embedded AssistNow Online and AssistNow Offline clients are available to provide better GNSS performance and faster Time-to-First-Fix. An AT command can enable / disable the clients.
CellLocate
®14
Enables the estimation of device position based on the parameters of the mobile network cells visible to the specific device based on the CellLocate® database:
• Normal scan: only the parameters of the visible home network cells are sent CellLocate® is available via a set of AT commands for CellLocate® service configuration and position request.
Hybrid Positioning14
The current module position is provided by a u-blox positioning chip or module or the estimated position from CellLocate® depending on which method provides the best and fastest solution according to the user configuration. Hybrid positioning is available via a set of AT commands that allow the configuration and the position request.
Wi-Fi via modem15
Full access to Wi-Fi modules is available through a dedicated SDIO interface. This means that from any host processor a single serial port can control the cellular module and the short range communication module.
DTMF decoder16
During a voice call, the Dual-Tone Multi-Frequency detector analyses the RX speech (coming from remote party). The detected DTMF symbols can be output via the related URC.
The feature can be enabled and configured through the +UDTMFCFG +UDTMFD AT command.
In-Band Modem15
In-Band modem solution for eCall and ERA-GLONASS emergency call applications over cellular networks implemented according to the 3GPP TS 26.267 specification [10]. When activated, the in-vehicle eCall / ERA-GLONASS system (IVS) creates an emergency call carrying both voice and data (including vehicle position data) directly to the nearest Public Safety Answering Point (PSAP) to determine whether rescue services should be dispatched to the known position.
Smart Temperature Supervisor
Constant monitoring of the module board temperature:
• Warning notification when the temperature approaches an upper or lower predefined threshold
• Shutdown notified and forced when the temperature value is outside the specified range (shutdown
suspended in case of an emergency call in progress)
This feature can be enabled and configured via the +USTS AT command.
☞ The sensor measures the board temperature, which can differ from ambient temperature.
Power saving
The power saving configuration is disabled by default, but it can be enabled and configured using the +UPSV AT command. When the power saving is enabled, the module automatically enters the low power idle-mode whenever possible, reducing current consumption.
During idle-mode, the module processor core runs with the RTC 32 kHz reference clock, which is generated by the internal 32 kHz oscillator.
Fast Dormancy
The Fast Dormancy feature, defined in 3GPP Rel.8, allows reduction of current consumption and network utilization during periods of data inactivity. It can be activated and configured by +UFDAC and +UDCONF=61 AT commands.
LTE cDRX
Both the Long DRX Cycle and the Short DRX cycle are supported for LTE Connected Discontinuous Reception, allowing reduction of current consumption and LTE network utilization during periods of data inactivity.
ODIS17
OMA-DM IMEI Sync (ODIS) is an AT&T functionality required at the cellular module level and used to identify the end device operating inside the network.
Table 3: Some of the main features supported by LARA-R2 series modules
☞ u-blox is extremely mindful of user privacy. When a position is sent to the CellLocate
®
server, u-blox
is unable to track the SIM used or the specific device.
14
Not supported by LARA-R204-02B, LARA-R211-02B-00 product versions.
15
Not supported by "02B", "62B", "82B", and "03B" product versions.
16
Not supported by LARA-R202-82B, LARA-R204-02B, and LARA-R220-62B modules product version.
17
Not supported by "03B" product version and LARA-R203-02B-34
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2 Interfaces

2.1 Power management

2.1.1 Module supply input (VCC)

LARA-R2 series modules must be supplied through the three VCC pins by a DC power supply. Voltage must be stable, because during operation the current drawn from VCC can vary by some order of magnitude, especially due to the surging consumption profile of the GSM system (described in the LARA-R2 series system integration manual [2]). It is important that the system power supply circuit is able to support peak power.
LARA-R211 modules provide separate supply inputs over the three VCC pins:
• VCC pins #52 and #53 represent the supply input for the internal RF power amplifier, demanding
most of the total current drawn of the module when RF transmission is enabled during a voice/data call
• VCC pin #51 represents the supply input for the internal baseband Power Management Unit and
the internal transceiver, demanding a minor part of the total current drawn of the module when RF transmission is enabled during a voice/data call

2.1.2 RTC supply input / output (V_BCKP)

When VCC voltage is within the valid operating range, the internal Power Management Unit (PMU) supplies the Real Time Clock (RTC) and the same supply voltage is available on the V_BCKP pin. If the VCC voltage is under the minimum operating limit (e.g. during not powered mode), the V_BCKP pin can externally supply the RTC.

2.1.3 Generic digital interfaces supply output (V_INT)

LARA-R2 series modules provide a 1.8 V supply rail output on the V_INT pin, which is internally generated when the module is switched on. The same voltage domain is used internally to supply the generic digital interfaces of the modules. The V_INT supply output can be used in place of an external discrete regulator.

2.2 Antenna interfaces

2.2.1 Antenna RF interfaces

The modules have two RF pins with a characteristic impedance of 50 . The primary antenna pin (ANT1) supports both Tx and Rx, providing the main antenna interface, while the secondary antenna pin (ANT2) supports Rx only for the LTE / 3G Rx diversity configuration.

2.2.2 Antenna detection

The ANT_DET pin is an Analog to Digital Converter (ADC) input with a current source provided by LARA-R2 modules to sense the antenna(s) presence (as an optional feature). It evaluates the resistance from ANT1 and ANT2 pins to GND by means of an external antenna detection circuit implemented on the application board. For more details, see the LARA-R2 series system integration manual [2] and the u-blox AT commands manual [1].
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2.3 System functions

2.3.1 Module power-on

LARA-R2 series modules can be switched on in one of the following ways:
• Rising edge on the VCC input to a valid voltage for module supply, i.e. applying module supply: the
modules switch on if the VCC supply is applied, starting from a voltage value of less than 2.1 V, with a rise time from 2.3 V to 2.8 V of less than 4 ms, reaching a proper nominal voltage value within VCC operating range.
Alternately, for example if the fast rise time on VCC rising edge cannot be guaranteed by the application, the LARA-R2 series module can be switched on from not-powered mode as follows:
• RESET_N input pin is held low by the external application during the VCC rising edge, so that the
module will switch on when the external application releases the RESET_N input pin from the low logic level, after the VCC supply voltage stabilizes at its proper nominal value within the operating range
• PWR_ON input pin is held low by the external application during the VCC rising edge, so that the
module will switch on when the external application releases the PWR_ON input pin from the low logic level, after the VCC supply voltage stabilizes at its proper nominal value within the operating range
When the LARA-R2 series modules are in the power-off mode (i.e. properly switched off as described in section 2.3.2, with valid VCC module supply applied), they can be switched on as following:
• Low pulse on the PWR_ON pin, which is normally set high by an internal pull-up, for a valid time
period (see section 4.2.8). The PWR_ON line should be driven by open drain, open collector or contact switch.
• Rising edge on the RESET_N pin, i.e. releasing the pin from the low level, normally set high by an
internal pull-up. The RESET_N line should be driven by open drain, open collector or contact switch.
• RTC alarm, i.e. pre-programmed scheduled time by +CALA AT command.

2.3.2 Module power-off

LARA-R2 series can be properly switched off, saving current parameter settings in the module’s non­volatile memory and performing a proper network detach, by:
• AT+CPWROFF command (see the u-blox AT commands manual [1]).
• Low pulse on the PWR_ON pin, which is normally set high by an internal pull-up, for a valid time
period (see section 4.2.8). The PWR_ON line should be driven by open drain, open collector or contact switch.
An abrupt under-voltage shutdown occurs on LARA-R2 series modules when the VCC supply is removed. If this occurs, it is not possible to store the current parameter settings in the module’s non­volatile memory or to perform the proper network detach.
An abrupt shutdown occurs on LARA-R2 series modules when a low level is applied on the RESET_N pin, which is normally set high by an internal pull-up. If this occurs, it is not possible to store the current parameter settings in the module’s non-volatile memory and to perform the proper network detach.
An over-temperature or an under-temperature shutdown occurs on LARA-R2 modules when the temperature measured within the cellular module reaches the dangerous area, if the optional Smart Temperature Supervisor feature is enabled and configured by the dedicated AT command. For more details, see the LARA-R2 series system integration manual [2] and the u-blox AT commands manual [1], +USTS AT command.
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2.3.3 Module reset

LARA-R2 series modules can be reset (rebooted) by:
• AT+CFUN command (see the u-blox AT commands manual [1]). This causes an “internal” or
“software” reset of the module. The current parameter settings are saved in the module’s non-
volatile memory and a proper network detach is performed.
An abrupt “external” or “hardware” reset occurs when a low level is applied to the RESET_N pin, which is normally set high by an internal pull-up, for a valid time period (see the section 4.2.9). This causes
an “external” or “hardware” reset of the entire module, including the integrated power management
unit, except for the RTC internal block: the V_INT generic digital interfaces supply is switched off and all the digital pins are tri-stated, but the V_BCKP supply and the RTC block are enabled. The current parameter settings are not saved in the module’s non-volatile memory and a proper network detach is not performed. The RESET_N line should be driven by open drain, open collector or contact switch.

2.3.4 Module / host configuration selection

☞ The functionality of the HOST_SELECT pin is not supported by any current product versions.
The modules include one pin (HOST_SELECT) to select the module / host application processor configuration: the pin is available to select, enable, connect, disconnect and subsequently reconnect the HSIC interface.

2.4 SIM

2.4.1 SIM interface

A SIM card interface is provided on the VSIM, SIM_IO, SIM_CLK, SIM_RST pins: the high-speed SIM/ME interface is implemented as well as the automatic detection of the required SIM supporting voltage.
Both 1.8 V and 3 V SIM types are supported (1.8 V and 3 V ME). Activation and deactivation with automatic voltage switch from 1.8 V to 3 V is implemented, according to ISO-IEC 7816-3 specifications. The SIM driver supports the PPS procedure for baud-rate selection, according to the values proposed by the SIM card/chip.

2.4.2 SIM detection

LARA-R2 series modules provide the SIM detection function over the GPIO5 pin to sense the SIM card physical presence (as an optional feature) when the pin of the module is properly connected to the mechanical switch of the SIM car holder. For more details, see the LARA-R2 series system integration manual [2].
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2.5 Serial communication

LARA-R2 series modules provide the following serial communication interfaces:
• Main UART interface: serial interface available for the communication with a host application
processor (AT commands, data, FW update by means of FOAT), for FW update by means of the u-blox EasyFlash tool and for diagnostic.
• Auxiliary UART interface: serial interface available for AT commands communication with a host
application processor, and for diagnostic.
• USB interface: Universal Serial Bus 2.0 compliant interface available for the communication with
a host application processor (AT commands, data communication, FW update by means of the FOAT feature), for FW update by means of the u-blox EasyFlash tool and for diagnostic.
• HSIC interface: High-Speed Inter-Chip USB compliant interface available for the communication
with a host application processor (AT commands, data communication, FW update by means of the FOAT feature), for FW update by means of the u-blox EasyFlash tool and for diagnostic.
• DDC interface: I2C bus compatible interface available for the communication with u-blox GNSS
positioning chips/modules and with external I2C devices as an audio codec.
• SDIO interface: Secure Digital Input Output interface available for the communication with
compatible u-blox short range radio communication Wi-Fi modules.

2.5.1 Main UART interface

LARA-R2 series modules include a 9-wire unbalanced main primary Universal Asynchronous Receiver/ Transmitter serial interface (UART) for communication with an external application host processor (AT commands, data communication, FW update by means of the FOAT feature), for FW update by means of the u-blox EasyFlash tool and for diagnostic.
UART features are:
• Complete serial port with RS-232 functionality conforming to ITU-T V.24 recommendation [14],
with CMOS compatible levels (0 V for low data bit / ON state, 1.8 V for high data bit / OFF state)
• Data lines (RXD output, TXD input), hardware flow control lines (CTS output, RTS input), modem
status and control lines (DTR input, DSR output, DCD output, RI output) are provided
• Hardware flow control (default value), software flow control, or none flow control are supported
• Power saving indication available on the hardware flow control output (CTS line): the line is driven
to the OFF state when the module is not prepared to accept data by the UART interface
• Power saving control over the RTS input or the DSR input can be enabled via AT+UPSV command
(see the u-blox AT commands manual [1] and LARA-R2 series system integration manual [2])
• The following baud rates are supported: 9’600, 19’200, 38’400, 57’600, 115’200 (default baud rate
when autobauding is disabled), 230’400, 460’800, 921’600, 3’000’000, 3’250’000, 6’000’000 and 6’500’000 bit/s
• One-shot autobauding is supported and it is enabled by default: automatic baud rate detection is
performed only once, at module start up. After the detection, the module works at the fixed baud rate (the detected one) and the baud rate can only be changed via AT command (see the u-blox AT commands manual [1], +IPR).
• The following frame formats are supported: 8N2, 8N1 (default format when automatic frame
recognition is disabled), 8E1, 8O1, 7E1 and 7O1.
• One-shot automatic frame recognition is supported and it is enabled by default in conjunction with
automatic baud rate detection (autobauding): the detection is performed only once, at module start up. After the detection, the module works at the detected frame format and it can only be changed via AT command (see u-blox AT commands manual [1], +ICF).
The main primary UART serial interface can be conveniently configured through AT commands: see the u-blox AT commands manual [1] (+IPR, +ICF, +IFC, &K, \Q, +UPSV, +USIO AT commands) and LARA-R2 series system integration manual [2].
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