LARA-R2/R6 migration guide HW guidelines to migrate from LARA-R2 to LARA-R6 Application note Abstract This document provides hardware guidelines to migrate from u-blox LARA-R2 series region-specific LTE Cat 1 / 3G / 2G modules to LARA-R6 series global and multi-region LTE Cat 1 / 3G / 2G modules, all which are designed in the compact LARA form factor. UBX-21010015 - R02 C1-Public www.u-blox.
LARA-R2/R6 migration guide - Application note Document information Title LARA-R2/R6 migration guide Subtitle HW guidelines to migrate from LARA-R2 to LARA-R6 Document type Application note Document number UBX-21010015 Revision and date R02 Disclosure restriction C1-Public 05-May-2022 Product status Corresponding content status Functional sample Draft For functional testing. Revised and supplementary data will be published later.
LARA-R2/R6 migration guide - Application note Contents Document information ................................................................................................................................ 2 Contents .......................................................................................................................................................... 3 1 LARA-R2 / LARA-R6 modules description ....................................................................................
LARA-R2/R6 migration guide - Application note 1 LARA-R2 / LARA-R6 modules description The u-blox LARA-R2 series comprises single-mode and multi-mode modules supporting LTE Cat 1 in FDD multi-band, 3G UMTS/HSPA in FDD multi-band, 2G GSM/GPRS/EGPRS in dual-band, providing the ideal solution for region-specific coverage.
LARA-R2/R6 migration guide - Application note • LARA-R2 series region-specific LTE Cat 1 / 3G / 2G modules: o o o o o o o • LARA-R202, designed mainly for operation in America, supporting four LTE Cat 1 FDD bands plus two 3G bands LARA-R203, designed for operation in North America, supporting three LTE Cat 1 FDD bands LARA-R204, designed for operation in USA, supporting two Verizon LTE Cat 1 FDD bands LARA-R211, designed mainly for operation in EMEA, supporting three LTE Cat 1 FDD bands plus two 2G bands
LARA-R2/R6 migration guide - Application note Table 3 summarizes LARA-R2, and LARA-R6 series modules cellular RF bands.
LARA-R2/R6 migration guide - Application note 2 Migration between LARA modules 2.
LARA-R2/R6 migration guide - Application note LARA-R2 series LARA-R6 series USB High-Speed Interface ● ● I2C interface ● ● Digital Audio Interface ● ●5 Clock output ● ●5 GPIOs ● ● Table 4: Summary of interfaces supported by LARA-R2/R6 migration guide modules The LARA modules are also form-factor compatible with the u-blox SARA, LISA, and TOBY cellular module families: although each has a different form factor, the footprints for the TOBY, LISA, LARA, and SARA modules have been developed t
LARA-R2/R6 migration guide - Application note Detailed guidelines to implement a nested application board, a comprehensive description of the u-blox reference nested design and detailed comparisons between the u-blox SARA, LARA, LISA, and TOBY modules are provided in the Nested design application note [3]. 2.2 Pin-out comparison between LARA modules Table 5 shows a pin-out comparison between LARA-R2 and LARA-R6 series modules.
LARA-R2/R6 migration guide - Application note No LARA-R2 series LARA-R6 series 10 RTS RTS Main primary UART HW flow control input (idle high, active low, with internal active pull-up enabled) V_INT voltage supply domain (1.8 V) Internal active pull-up strength: ~7.5 kΩ Main primary UART HW flow control input (idle high, active low, with internal active pull-up enabled) V_INT voltage supply domain (1.
LARA-R2/R6 migration guide - Application note No LARA-R2 series LARA-R6 series 19 GPIO6 GPIO6 13 or 26 MHz clock output enabled by AT command. Default: tri-stated with internal pull-down enabled. V_INT voltage supply domain (1.8 V) Push-pull output type. Driver strength: 4 mA Internal active pull-up/down strength: ~7.5 kΩ 12.288 MHz clock output enabled by AT command 6. Default: tri-stated with internal pull-down enabled. V_INT voltage supply domain (1.8 V) Push-pull output type.
LARA-R2/R6 migration guide - Application note No LARA-R2 series LARA-R6 series 27 SCL SCL I2C clock (open drain, idle high, active low, no internal pull-up). Alternative function: Second auxiliary UART data output (push-pull, idle high, active low). V_INT voltage supply domain (1.8 V) I2C clock (open drain, idle high, active low, 2.2 kΩ internal pull-up). V_INT voltage supply domain (1.8 V) USB_D- USB_D- USB data I/O (D-) High-speed USB 2.
LARA-R2/R6 migration guide - Application note No LARA-R2 series LARA-R6 series 38 SIM_CLK SIM_CLK Clock output for external 1.8 V / 3 V SIM card/chip Clock output for external 1.8 V / 3 V SIM card/chip SIM_IO SIM_IO I/O data line for external 1.8 V / 3 V SIM card/chip Internal pull-up: 4.7 kΩ I/O data line for external 1.8 V / 3 V SIM card/chip Internal pull-up: 4.7 kΩ SIM_RST SIM_RST Reset output for external 1.8 V / 3 V SIM card/chip Reset output for external 1.
LARA-R2/R6 migration guide - Application note No LARA-R2 series LARA-R6 series 53 VCC VCC Supply input for the whole module Normal operating range: 3.3 ÷ 4.4 V Extended operating range: 3.0 ÷ 4.5 V LARA-R211: Supply for RF Power Amplifiers part Supply for RF Power Amplifiers part Normal operating range: 3.3 ÷ 4.5 V Extended operating range: 2.8 ÷ 4.5 V GND GND Ground Ground GND GND Ground Ground ANT1 ANT1 RF pin for main Tx / Rx cellular antenna 50 Ω nominal characteristic impedance.
LARA-R2/R6 migration guide - Application note 2.3 Interfaces comparison between LARA modules 2.3.1 VCC module supply input As the LARA-R2 and LARA-R6 series modules have compatible power requirements, there are only minor differences in their VCC input voltage ranges and current consumption figures. The same compatible external VCC supply circuit can be implemented for all the LARA modules, as for example the one described in Figure 4.
LARA-R2/R6 migration guide - Application note It is recommended to sense the status of the V_INT output to define when the module is switched on, and it is recommended to provide a test point for diagnostic. 2.3.3 V_BCKP RTC supply input/output LARA-R2 series modules provide the RTC supply input/output at the V_BCKP pin, which is not available on LARA-R6 series modules, having the same pin internally not connected. 2.3.
LARA-R2/R6 migration guide - Application note supply is applied to the modules: the PWR_ON input line must be properly toggled low, with valid VCC supply present, to trigger the switch-on sequence of the modules. The PWR_ON input line can be used to trigger the graceful switch-off procedure of the LARA-R2 and LARA-R6 series modules, as an alternative to using the +CPWROFF AT command. Afterwards, the switch-on sequence of modules can be triggered again by properly toggling low PWR_ON input line.
LARA-R2/R6 migration guide - Application note The baud rates and configurations available and supported by LARA-R2 and LARA-R6 series modules for the main primary UART interface may slightly differ: • • LARA-R2 series modules have the automatic baud rate and frame format detection available by default, and they support high-speed UART data rates up to 6.5 Mbit/s.
LARA-R2/R6 migration guide - Application note I2C devices as for example an audio codec: the module acts as an I2C host which can communicate with I2C devices in accordance with the I2C bus specifications. LARA-R2 modules do not integrate pull-up resistors on SDA and SCL lines: external pull-up resistors have to be provided accordingly if the I2C interface is used in applications with LARA-R2 modules.
LARA-R2/R6 migration guide - Application note 2.3.15 Other considerations and test points Table 6 lists the interfaces dedicated for special purposes, as the firmware update by means of u-blox EasyFlash tool and/or for diagnostic by means of u-blox m-center tool, on LARA modules.
LARA-R2/R6 migration guide - Application note 2.4 Schematic for LARA modules integration Figure 6 shows an example of a schematic diagram where a LARA-R2 or a LARA-R6 series module can be integrated into the same application board, using all the available interfaces and functions of the modules. The different mounting options for the external parts are noted herein according to the functions supported by each module.
LARA-R2/R6 migration guide - Application note Appendix A Glossary Abbreviation Definition 2G 2nd Generation Cellular Technology (GSM, GPRS, EGPRS) 3G 3rd Generation Cellular Technology (UMTS, HSDPA, HSUPA) 3GPP 3rd Generation Partnership Project 8-PSK 8 Phase-Shift Keying modulation APAC Asia-Pacific AT AT Command Interpreter Software Subsystem, or attention AUX Auxiliary Cat Category CDMA Code Division Multiple Access CS Coding Scheme CSFB Circuit-Switched-Fall-Back CTS Clear To S
LARA-R2/R6 migration guide - Application note Abbreviation Definition HSUPA High Speed Uplink Packet Access HTTPS HyperText Transfer Protocol Secure I/O Input/Output I2C Inter-Integrated Circuit interface I2S Inter IC Sound interface IP Internet Protocol LED Light Emitting Diode LGA Land Grid Array LNA Low Noise Amplifier LPWA Low Power Wide Area LTE Long Term Evolution LwM2M Open Mobile Alliance Lightweight Machine-to-Machine protocol MCS Modulation and Coding Scheme MQTT Mess
LARA-R2/R6 migration guide - Application note Related documents [1] [2] [3] [4] [5] [6] [7] ☞ u-blox LARA-R2 series data sheet, UBX-16005783 u-blox LARA-R2 series system integration manual, UBX-16010573 u-blox nested design application note, UBX-16007243 u-blox LARA-R6 series data sheet, UBX-21004391 u-blox LARA-R6 series system integration manual, UBX-21010011 u-blox AT commands manual, UBX-13002752 u-blox LARA-R6 series AT commands manual, UBX-21046719 For regular updates to u-blox documentation and to
LARA-R2/R6 migration guide - Application note Contact For complete contact information, visit us at www.u-blox.com. u-blox Offices North, Central and South America u-blox America, Inc. Phone: Email: +1 703 483 3180 info_us@u-blox.com Regional Office West Coast: Phone: Email: +1 408 573 3640 info_us@u-blox.com Headquarters Europe, Middle East, Africa Asia, Australia, Pacific u-blox AG Phone: +65 6734 3811 Email: info_ap@u-blox.com Support: support_ap@u-blox.
