u-blox LARA-R280 System Integration Manual
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u-blox LARA-R280 System Integration Manual

u-blox LARA-R280 System Integration Manual

Size-optimized lte cat 1 modules in single and multimode configurations
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LARA-R2 series
Size-optimized LTE Cat 1 modules in single and multi -
mode configurations
System integration manual
Abstract
This document describes the features and the system integration of LARA-R2 series multi-mode
cellular modules. These modules are a complete, cost efficient and performance optimized LTE
Cat 1 / 3G / 2G multi-mode solution covering up to 5 LTE bands, up to 2 UMTS/HSPA bands and up
to 2 GSM/EGPRS bands in the very small and compact LARA form factor.
UBX-16010573 - R22
C1-Public
www.u-blox.com

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  • Page 1 These modules are a complete, cost efficient and performance optimized LTE Cat 1 / 3G / 2G multi-mode solution covering up to 5 LTE bands, up to 2 UMTS/HSPA bands and up to 2 GSM/EGPRS bands in the very small and compact LARA form factor. UBX-16010573 - R22 C1-Public www.u-blox.com...

  • Page 2: Document Information

    LARA-R2 series - System integration manual Document information Title LARA-R2 series Subtitle Size-optimized LTE Cat 1 modules in single and multi-mode configurations Document type System integration manual Document number UBX-16010573 Revision and date 06-Jul-2021 Disclosure restriction C1-Public Product status Corresponding content status Functional sample Draft For functional testing.
  • Page 3 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.

  • Page 4: Table Of Contents

    LARA-R2 series - System integration manual Contents Document information ..........................2 Contents ................................4 System description ..........................8 1.1 Overview ................................ 8 1.2 Architecture ...............................11 1.3 Pin-out .................................12 1.4 Operating modes ............................17 1.5 Supply interfaces ............................19 1.5.1 Module supply input (VCC) ......................19 1.5.2 RTC supply input/output (V_BCKP) ..................27 1.5.3...
  • Page 5 2.12 Thermal guidelines ..........................128 2.13 ESD guidelines ............................129 2.13.1 ESD immunity test overview ....................129 2.13.2 ESD immunity test of u-blox LARA-R2 series reference designs ........129 2.13.3 ESD application circuits ......................130 UBX-16010573 - R22 Contents Page 5 of 163...
  • Page 6 4.3.2 Modifications ..........................145 4.4 European Conformance CE mark ....................... 147 Product testing ..........................148 5.1 u-blox in-series production test ......................148 5.2 Test parameters for OEM manufacturers ..................149 5.2.1 “Go/No go” tests for integrated devices ................149 5.2.2 Functional tests providing RF operation ................
  • Page 7 LARA-R2 series - System integration manual Related documentation ......................... 161 Revision history ............................162 Contact ................................ 163 UBX-16010573 - R22 Contents Page 7 of 163 C1-Public...

  • Page 8: System Description

    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.
  • Page 9 Table 1: LARA-R2 series main features summary LTE band 12 is a superset including band 17: LTE band 12 is supported along with Multi-Frequency Band Indicator feature Not supported by LARA-R202-02B, LARA-R202-82B, or LARA-R203-02B product versions AT&T certified with VoLTE External GNSS control via modem, AssistNow Software and CellLocate®...
  • Page 10 DL Rx diversity DL Rx Diversity DL Advanced Rx Performance Phase 1 Band support Band support: Band support: • LARA-R202: • LARA-R202: • Band 12 (700 MHz) • Band 5 (850 MHz) • Band 5 (850 MHz) • Band 2 (1900 MHz) •...

  • Page 11: Architecture

    LARA-R2 series - System integration manual 1.2 Architecture Figure 1 summarizes the internal architecture of the LARA-R2 series modules. ANT_DET Filter Duplexer 26 MHz Filters Filters Switch DDC(I ANT1 Filter SDIO Duplexer Filter UART Filters Memory transceiver Cellular Base-band Filters Filter HSIC processor...

  • Page 12: Baseband And Power Management Section

    LARA-R2 series - System integration manual Baseband and power management section The Baseband and Power Management section is composed of the following main elements: • A mixed signal ASIC, which integrates Microprocessor for control functions DSP core for cellular Layer 1 and digital processing of Rx and Tx signal paths Memory interface controller Dedicated peripheral blocks for control of the USB, SIM and generic digital interfaces Interfaces to RF transceiver ASIC...
  • Page 13 UART UART data output 1.8 V output, Circuit 104 (RXD) in ITU-T V.24, for AT commands, data communication, FOAT, FW update by u-blox EasyFlash tool and diagnostic. Test-Point and series 0  for diagnostic recommended. See section 1.9.1 for functional description.
  • Page 14 2.6.3 for external circuit design-in. The auxiliary UART interface is not supported by the ‘02B’, ‘62B’ and ‘82B’ versions of LARA-R202, LARA-R203, LARA-R204, LARA-R220, LARA-R280, and LARA-R281 modules, and by ‘02B-00’, ‘02B-01’ and ‘02B-02’ versions of LARA-R211 modules UBX-16010573 - R22...
  • Page 15 Not supported by ‘02B’, ‘62B’, ‘82B’, ‘03B’ product versions. HSIC USB strobe line HSIC interface for AT commands, data communication, FOAT, FW update by u-blox EasyFlash tool and diagnostic. 50  nominal characteristic impedance. Test-Point for diagnostic / FW update is recommended. See section 1.9.4...
  • Page 16 LARA-R2 series - System integration manual Function Pin name Pin no. Description Remarks I2S_CLK I/O / I2S clock / I2S serial clock, alternatively configurable as GPIO. GPIO I2S not supported by LARA-R204-02B / LARA-R220-62B. See sections 1.10 1.12 for functional description. See sections for external circuit design-in.

  • Page 17: Operating Modes

    USB device (see 1.9.3.4) AT+UPSV (see the u-blox AT commands • The connected u-blox GNSS receiver forces a wakeup of the manual [2]). cellular module using the GNSS Tx data ready function over the GPIO3 pin (see 1.9.5)

  • Page 18: Power Off

    1.5.1.4, 1.9.1.4 and to the u-blox AT whenever possible and the module wakes up from idle to active mode commands manual [2]). in the events listed above (see idle to active transition description).

  • Page 19: Supply Interfaces

    LARA-R2 series - System integration manual 1.5 Supply interfaces 1.5.1 Module supply input (VCC) The modules must be supplied via the three VCC pins that represent the module power supply input. The VCC pins are internally connected to the RF power amplifier and to the integrated Power Management Unit: all supply voltages needed by the module are generated from the VCC supply by integrated voltage regulators, including the V_BCKP Real Time Clock supply, V_INT digital interfaces supply and VSIM SIM card supply.
  • Page 20 LARA-R2 series - System integration manual 1.5.1.1 VCC supply requirements Table 6 summarizes the requirements for the VCC module supply. See section 2.2.1 for all the suggestions to properly design a VCC supply circuit compliant to the requirements listed in Table ⚠...
  • Page 21 LARA-R2 series - System integration manual 1.5.1.2 VCC consumption in 2G connected mode When a GSM call is established, the VCC consumption is determined by the current consumption profile typical of the GSM transmitting and receiving bursts. The current consumption peak during a transmission slot is strictly dependent on the transmitted power, which is regulated by the network.
  • Page 22 2G single-slot call. The multi-slot transmission power can be further reduced by configuring the actual Multi-Slot Power Reduction profile with the dedicated AT command, AT+UDCONF=40 (see the u-blox AT commands manual [2]). If the module transmits in GPRS class 12 in the 850 or 900 MHz bands, at the maximum RF power control level, the current consumption can reach a quite high peak but lower than the one achievable in 2G single-slot mode.
  • Page 23 LARA-R2 series - System integration manual 1.5.1.3 VCC consumption in 3G connected mode During a 3G connection, the module can transmit and receive continuously due to the Frequency Division Duplex (FDD) mode of operation with the Wideband Code Division Multiple Access (WCDMA). The current consumption depends on output RF power, which is always regulated by the network (the current base station) sending power control commands to the module.
  • Page 24 LARA-R2 series - System integration manual 1.5.1.4 VCC consumption in LTE connected mode During an LTE connection, the module can transmit and receive continuously due to the Frequency Division Duplex (FDD) mode of operation used in LTE radio access technology. The current consumption depends on output RF power, which is always regulated by the network (the current base station) sending power control commands to the module.
  • Page 25 The power saving configuration is disabled by default, but it can be enabled using the appropriate AT command (see u-blox AT commands manual [2], AT+UPSV command). When power saving is enabled, the module automatically enters low power idle mode whenever possible, reducing current consumption.
  • Page 26 Power saving configuration is disabled by default, or it can be disabled using the appropriate AT command (see the u-blox AT commands manual [2], AT+UPSV command). When power saving is disabled, the module does not automatically enter idle mode whenever possible: the module remains in active mode.

  • Page 27: Rtc Supply Input/Output (V_Bckp)

    LARA-R2 series - System integration manual 1.5.2 RTC supply input/output (V_BCKP) The V_BCKP pin of LARA-R2 series modules connects the supply for the Real Time Clock (RTC) and Power-On internal logic. This supply domain is internally generated by a linear LDO regulator integrated in the Power Management Unit, as described in Figure 11.

  • Page 28: Generic Digital Interfaces Supply Output (V_Int)

    LARA-R2 series - System integration manual 1.5.3 Generic digital interfaces supply output (V_INT) The V_INT output pin of the LARA-R2 series modules is connected to an internal 1.8 V supply with a current capability specified in the LARA-R2 series data sheet [1]. This supply is internally generated by a switching step-down regulator integrated in the Power Management Unit and it is internally used to source the generic digital I/O interfaces of the cellular module, as described in Figure...

  • Page 29: System Function Interfaces

    RESET_N pin from the low logic level • RTC alarm, i.e. pre-programmed alarm by AT+CALA command (see the u-blox AT commands manual [2]). As described in...
  • Page 30 Figure 14: LARA-R2 series switch-on sequence description The greeting text can be activated by means of the +CSGT AT command (see u-blox AT commands manual [2]) to notify the external application that the module is ready to operate (i.e. ready to reply to...

  • Page 31: Module Power-Off

    RESET_N input pin during module normal operation: the RESET_N line should be set low only if a reset or shutdown via AT commands fails or if the module does not reply to a specific AT command after a time period longer than the one defined in the u-blox AT commands manual [2].
  • Page 32 LARA-R2 series - System integration manual Figure 15 illustrates the LARA-R2 series modules switch-off sequence started by means of the AT+CPWROFF command, allowing storage of the current parameter settings in the module’s non-volatile memory and a proper network detach, with the following phases: •...
  • Page 33 LARA-R2 series - System integration manual Figure 16 illustrates the LARA-R2 series modules’ switch-off sequence started by means of the PWR_ON input pin, allowing storage of current parameter settings in the module’s non-volatile memory and a proper network detach, with the following phases: •...

  • Page 34: Module Reset

    AT commands fails or if the module does not provide a reply to a specific AT command after a time period longer than the one defined in the u-blox AT commands manual [2]. As described in...

  • Page 35: Antenna Interface

    LARA-R2 series - System integration manual 1.7 Antenna interface 1.7.1 Antenna RF interfaces (ANT1 / ANT2) LARA-R2 series modules provide two RF interfaces for connecting the external antennas: • ANT1 represents the primary RF input/output for transmission and reception of RF signals. •...
  • Page 36 LARA-R2 series - System integration manual Item Requirement Remark Impedance 50  nominal characteristic The impedance of the antenna RF connection must match the 50  impedance impedance of the ANT2 port. Frequency See the LARA-R2 series data The required frequency range of the antennas connected to the ANT2 port Range sheet depends on the operating bands of the used cellular module and the used...

  • Page 37: Antenna Detection Interface (Ant_Det)

    The SIM card detection function provided by the GPIO5 pin is an optional feature that can be implemented / used or not according to the application requirements: an Unsolicited Result Code (URC) is generated each time that there is a change of status (for more details, see the u-blox AT commands manual [2], +UGPIOC, +CIND, +CMER).

  • Page 38: Data Communication Interfaces

    Main UART interface: Universal Asynchronous Receiver/Transmitter serial interface available for the communication with a host application processor (AT commands, data communication, FW update by means of FOAT), for FW update by means of the u-blox EasyFlash tool and for diagnostics (see section 1.9.1).
  • Page 39 The one-shot autobauding is supported: the automatic baud rate detection is performed only once, at module start-up. After the detection, the module works at the detected baud rate and the baud rate can only be changed by an AT command (see the u-blox AT commands manual [2], +IPR command). ☞...
  • Page 40 LARA-R2 series - System integration manual The modules support one-shot automatic frame recognition in conjunction with one-shot autobauding. The following frame formats can be configured by an AT command (see the u-blox AT commands manual [2], +ICF): • 8N1 (8 data bits, no parity, 1 stop bit), default frame configuration with a fixed baud rate, see Figure 18 •...
  • Page 41 [21]. The CTS hardware flow control setting can be changed by using AT commands (for more details, see the u-blox AT commands manual [2], AT&K, AT\Q, AT+IFC, AT+UCTS AT command). ☞ When the power saving configuration is enabled by the AT+UPSV command and the hardware...
  • Page 42 Module behavior according to RTS hardware flow control status can be configured by using AT commands (for more details, see the u-blox AT commands manual [2], AT&K, AT\Q, AT+IFC command descriptions). If AT+UPSV=2 is set and HW flow control is disabled, the module monitors the RTS line to manage the power saving configuration (for more details, see section 1.9.1.4...
  • Page 43 DTE: the DCD line is set to the ON state as soon as the switch to binary/text input mode is completed and the prompt is issued; DCD line is set to OFF as soon as the input mode is interrupted or completed (for more details see the u-blox AT commands manual [2]).
  • Page 44 The RI line can additionally notify all the URCs and all the incoming data in PPP and Direct Link connections, if the feature is enabled by the AT+URING command (for more details, see the u-blox AT commands manual [2]): the RI line is asserted when one of the configured events occur and it remains...
  • Page 45 UART interface communication process in the various power saving configurations, in relation with HW flow control settings and RTS input line status. For more details on the +UPSV AT command description, refer to the u-blox AT commands manual [2].
  • Page 46 LARA-R2 series - System integration manual AT+UPSV HW flow control RTS line DTR line Communication during idle mode and wake up Disabled (AT&K0) OFF ON or OFF Data sent by the DTE is lost by the module. Data sent by the module is correctly received by the DTE if it is ready to receive data, otherwise data is lost.
  • Page 47 LARA-R2 series - System integration manual • 3G or LTE: UART is asynchronously enabled to paging receptions, as UART is enabled for ~20 ms, and then, if data are not received or sent, UART is disabled for 2.5 s, and afterwards the interface is enabled again •...
  • Page 48 DTE over the UART. When the AT+UPSV=3 configuration is enabled, the DTR input line can still be used by the DTE to control the module behavior according to the AT&D command configuration (see the u-blox AT commands manual [2]).

  • Page 49: Additional Considerations

    AT interface, and this +IPR AT command configuration must be saved in the module’s non-volatile memory (see the u-blox AT commands manual [2]). Then after the subsequent module re-boot, AT+UPSV=1, AT+UPSV=2 or AT+UPSV=3 can be issued over the used AT interface (the USB): all the AT profiles are updated accordingly.

  • Page 50: Auxiliary Uart Interface

    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 [2], +IPR).

  • Page 51: Usb Interface

    1.14.13 and the FW update application note [23]) • FW upgrades by means of the u-blox EasyFlash tool (see the FW update application note [23]) • Trace log capture (diagnostic purposes) The module itself acts as a USB device and can be connected to a USB host such as a Personal Computer or an embedded application microprocessor equipped with compatible drivers.
  • Page 52 LARA-R2 series - System integration manual This VID and PID combination identifies a USB profile where no USB function described above is available: AT commands must not be sent to the module over the USB profile identified by this VID and PID combination.
  • Page 53 • Windows 10 IoT The module firmware can be upgraded over the USB interface by means of the FOAT feature, or using the u-blox EasyFlash tool (for more details, see the FW update application note [23]. 1.9.3.3 USB in Linux/Android...

  • Page 54: Hsic Interface

    SDA and SCL pins can be alternatively configured, in a mutually exclusive way, as auxiliary UART interface (AUX UART) on LARA-R2 series modules, except the "02B", "62B" and "82B" versions of the LARA-R202, LARA-R203, LARA-R204, LARA-R220, LARA-R280 and LARA-R281 modules, and the "02B-00", "02B-01" and "02B-02" versions of LARA-R211 modules.
  • Page 55 AT commands via the UART or USB serial interface of the cellular module allow for full control of the GNSS receiver from any host processor. The modules feature embedded GNSS aiding, that is, a set of specific features developed by u-blox to enhance GNSS performance, decreasing the Time-To-First-Fix (TTFF), thus allowing the calculation of the position in a shorter time with higher accuracy.

  • Page 56: Sdio Interface

    VCC supply of the GNSS receiver is disabled. This enables the u-blox positioning receiver to recover from a power breakdown with either a hot start or a warm start (depending on the duration of the GNSS receiver VCC outage) and to maintain the configuration settings saved in the backup RAM.

  • Page 57: Audio Interface

    16 x 2 x <I2S_sample_rate> in normal I2S mode (long synchronization signal) ☞ For the complete description of the possible configurations and settings of the I2S digital audio interface for PCM and Normal I2S modes, refer to the u-blox AT commands manual [2], +UI2S AT command. UBX-16010573 - R22...

  • Page 58: Clock Output

    LARA-R2 series modules include 9 pins (GPIO1-GPIO5, I2S_TXD, I2S_RXD, I2S_CLK, I2S_WA) which can be configured as General Purpose Input/Output or to provide custom functions via u-blox AT commands (for more details, see the u-blox AT commands manual [2], +UGPIOC, +UGPIOR, +UGPIOW...

  • Page 59: System Features

    1.14.3 Dual stack IPv4/IPv6 LARA-R2 series support both Internet Protocol version 4 and Internet Protocol version 6 in parallel. For more details about dual stack IPv4/IPv6, see the u-blox AT commands manual [2]. 1.14.4 PPP LARA-R2 series support a Point-to-Point Protocol in order to establish a connection with the external application via a serial interface (UART, MUX, or CDC-ACM): IPv4/IPv6 packets are relayed through the cellular protocol stack with the external application.

  • Page 60: Http

    When Direct Link is used for a FTP file transfer, only the file content pass through USB / UART serial interface, whereas all the FTP commands handling is managed internally by the FTP application. For more details about embedded FTP functionalities, see the u-blox AT commands manual [2]. 1.14.7 HTTP...
  • Page 61 LARA-R2 series - System integration manual SSL/TLS Version TLS 1.0 TLS 1.1 TLS 1.2 Table 14: SSL/TLS version support Algorithm Table 15: Authentication Algorithm 3DES AES128 AES256 Table 16: Encryption Algorithm SHA/SHA1 SHA256 HA384 Table 17: Message digest Description Registry value TLS_RSA_WITH_AES_128_CBC_SHA 0x00,0x2F TLS_RSA_WITH_AES_128_CBC_SHA256...

  • Page 62: Bearer Independent Protocol

    With the BIP for Over-the-Air SIM provisioning, the data transfer from and to the SIM uses either an already active PDP context or a new PDP context established with the APN provided by the SIM card. For more details, see the u-blox AT commands manual [2].
  • Page 63 LARA-R2 series - System integration manual The CellLocate ® database is compiled from the position of devices which observed, in the past, a specific cell or set of cells (historical observations) as follows: Several devices reported their position to the CellLocate ®...
  • Page 64 See the GNSS implementation application note [22] for a complete description of the feature. ☞ 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.

  • Page 65: Wi-Fi Integration

    Full access to external u-blox short range communication Wi-Fi modules is available through SDIO interface is not supported by the "02B", "62B", "82B", and "03B" product versions. The SDIO interface is designed to provide full access to external u-blox short range communication Wi-Fi modules (see sections 1.9.6...

  • Page 66: Smart Temperature Management

    Smart Temperature Supervisor (STS) The Smart Temperature Supervisor is activated and configured by a dedicated AT+USTS command. See the u-blox AT commands manual for more details. An URC indication is provided once the feature is enabled and at the module power-on.

  • Page 67: Threshold Definitions

    LARA-R2 series - System integration manual Figure 26 shows the flow diagram implemented for the Smart Temperature Supervisor. IF STS enabled Feature enabled Feature disabled: (full logic or no action indication only) Read temperature <Ti<t Temperature is within normal operating range Previously outside of Safe Area...

  • Page 68: Power Saving

    The connected USB host forces a remote wake-up of the module as USB device (see 1.9.3.4) • The connected u-blox GNSS receiver forces a wake-up of the cellular module using the GNSS Tx data ready function over GPIO3 (see 1.9.5) •...

  • Page 69: Design-In

    ☞ It is recommended to follow the specific design guidelines provided by each manufacturer of any external part selected for the application board integrating the u-blox cellular modules. UBX-16010573 - R22 Design-in Page 69 of 163...

  • Page 70: Supply Interfaces

    LARA-R2 series - System integration manual 2.2 Supply interfaces 2.2.1 Module supply (VCC) 2.2.1.1 General guidelines for VCC supply circuit selection and design All of the available VCC pins must be connected to the external supply minimizing the power loss due to series resistance.
  • Page 71 LARA-R2 series - System integration manual DC/DC switching charger is the typical choice when the charging source has an high nominal voltage (e.g. ~12 V), whereas a linear charger is the typical choice when the charging source has a relatively low nominal voltage (~5 V).
  • Page 72 LARA-R2 series - System integration manual • PWM mode operation: it is preferable to select regulators with a Pulse Width Modulation (PWM) mode. While in connected mode, the Pulse Frequency Modulation (PFM) mode and PFM/PWM modes transitions must be avoided in order to reduce noise on the VCC voltage profile. Switching regulators can be used that are able to switch between low ripple PWM mode and high ripple PFM mode, provided that the mode transition occurs when the module changes status from the idle/active modes to connected mode.
  • Page 73 LARA-R2 series - System integration manual Figure 29 and the components listed in Table 21 show an example of a low cost power supply circuit, where the VCC module supply is provided by a step-down switching regulator capable of delivering the specified maximum peak / pulse current to the VCC pins, transforming a 12 V supply input.
  • Page 74 LARA-R2 series - System integration manual 2.2.1.3 Guidelines for VCC supply circuit design using a LDO linear regulator The use of a linear regulator is suggested when the difference from the available supply rail and the VCC value is low: linear regulators provide high efficiency when transforming a 5 V supply to a voltage value within the module VCC normal operating range.
  • Page 75 LARA-R2 series - System integration manual Figure 31 and the components listed in Table 23 show an example of a low cost power supply circuit, where the VCC module supply is provided by an LDO linear regulator capable of delivering the specified highest peak / pulse current, with the proper power handling capability.
  • Page 76 LARA-R2 series - System integration manual 2.2.1.5 Guidelines for VCC supply circuit design using a primary battery The characteristics of a primary (non-rechargeable) battery connected to the VCC pins should meet the following prerequisites to comply with the module’s VCC requirements summarized in Table •...
  • Page 77 LARA-R2 series - System integration manual LARA-R2 series Recommended for Recommended for cellular modules cellular modules supporting LTE band-7 supporting 2G Figure 32: Suggested schematic for the VCC bypass capacitors to reduce ripple / noise on the supply voltage profile Reference Description Part number - manufacturer...
  • Page 78 LARA-R2 series - System integration manual LARA-R211 Step-up Regulator SHDNn Li-Ion/Li-Pol Battery Figure 33: VCC circuit example with a separate supply for LARA-R211 modules Reference Description Part number - manufacturer T520D337M006ATE045 - KEMET 330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m 10 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C103KA01 - Murata 100 nF Capacitor Ceramic X7R 0402 10% 16 V...
  • Page 79 LARA-R2 series - System integration manual The L6924U, as a linear charger, is more suitable for applications where the charging source has a relatively low nominal voltage (~5 V), so that a switching charger is suggested for applications where the charging source has a relatively high nominal voltage (e.g. ~12 V, see the following section 2.2.1.9 for specific design-in).
  • Page 80 LARA-R2 series - System integration manual A power management IC should meet the following prerequisites to comply with the module VCC requirements summarized in Table • High efficiency internal step down converter, compliant with the performances specified in section 2.2.1.2 •...
  • Page 81 LARA-R2 series - System integration manual Using a battery pack with an internal NTC resistor, the MP2617H IC can monitor the battery temperature to protect the battery from operating under unsafe thermal conditions. Several parameters, such as the charging current, the charging timings, the input current limit, the input voltage limit, and the system output voltage, can be easily set according to the specific application requirements, as the actual electrical characteristics of the battery and the external supply / charging source: proper resistors or capacitors must be accordingly connected to the related...
  • Page 82 LARA-R2 series modules internal power-off sequence, which must be properly started sending the AT+CPWROFF command (see the u-blox AT commands manual [2]). Removing the VCC power can be useful in order to minimize the current consumption when the LARA-R2 series modules are switched off.
  • Page 83 LARA-R2 series - System integration manual 2.2.1.11 Guidelines for VCC supply layout design • Good connection of the module VCC pins with a DC supply source is required for correct RF performance. Guidelines are summarized in the following list: • All the available VCC pins must be connected to the DC source.

  • Page 84: Rtc Supply (V_Bckp)

    LARA-R2 series - System integration manual 2.2.2 RTC supply (V_BCKP) 2.2.2.1 Guidelines for V_BCKP circuit design LARA-R2 series modules provide the V_BCKP RTC supply input/output, which can be mainly used to: • Provide RTC back-up when VCC supply is removed If RTC timing is required to run for a time interval of T [s] when VCC supply is removed, place a capacitor with a nominal capacitance of C [µF] at the V_BCKP pin.

  • Page 85: Interface Supply (V_Int)

    VCC supply of the GNSS receiver is disabled. This enables the u-blox GNSS receiver to recover from a power breakdown with either a hot start or a warm start (depending on the duration of the positioning VCC outage) and to maintain the configuration settings saved in the backup RAM.
  • Page 86 LARA-R2 series - System integration manual ☞ Since the V_INT supply is generated by an internal switching step-down regulator, the V_INT voltage ripple can range as specified in the LARA-R2 series data sheet [1]: it is not recommended to supply sensitive analog circuitry without adequate filtering for digital noise. ☞...

  • Page 87: System Functions Interfaces

    LARA-R2 series - System integration manual 2.3 System functions interfaces 2.3.1 Module power-on (PWR_ON) 2.3.1.1 Guidelines for PWR_ON circuit design LARA-R2 series modules’ PWR_ON input is equipped with an internal active pull-up resistor to the VCC module supply as described in Figure 39: an external pull-up resistor is not required and should not be provided.

  • Page 88: Module Reset (Reset_N)

    LARA-R2 series - System integration manual 2.3.2 Module reset (RESET_N) 2.3.2.1 Guidelines for RESET_N circuit design LARA-R2 series RESET_N is equipped with an internal pull-up to the V_BCKP supply as described in Figure 40. An external pull-up resistor is not required. If connecting the RESET_N input to a push button, the pin will be externally accessible on the application device.

  • Page 89: Module / Host Configuration Selection

    LARA-R2 series - System integration manual 2.3.3 Module / host configuration selection 2.3.3.1 Guidelines for HOST_SELECT circuit design ☞ The HOST_SELECT pin functionality is not supported by the "02B", "62B", "82B", "03B" versions. LARA-R2 series 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 re-connect the HSIC (USB High-Speed Inter-Chip) interface.

  • Page 90: Antenna Interface

    LARA-R2 series - System integration manual 2.4 Antenna interface LARA-R2 series modules provide two RF interfaces for connecting the external antennas: • The ANT1 pin represents the primary RF input/output for LTE/3G/2G RF signals transmission and reception. • The ANT2 pin represents the secondary RF input for LTE/3G Rx diversity RF signals reception. Both the ANT1 and the ANT2 pins have a nominal characteristic impedance of 50 ...

  • Page 91: Guidelines For Antenna Rf Interface Design

    LARA-R2 series - System integration manual As a numerical example, the physical restriction to the PCB design can be considered as following: Frequency = 750 MHz → Wavelength = 40 cm → Minimum GND plane size = 10 cm Radiation performance depends on the whole PCB and antenna system design, including product mechanical design and usage.
  • Page 92 LARA-R2 series - System integration manual GND clearance GND clearance GND clearance GND clearance on top layer on very close buried layer on top layer on very close buried layer around ANT1 pad below ANT1 pad around ANT2 pad below ANT2 pad Min.
  • Page 93 LARA-R2 series - System integration manual If the two examples do not match the application PCB layup, the 50  characteristic impedance calculation can be made using the HFSS commercial finite element method solver for electromagnetic structures from Ansys Corporation, or using freeware tools like Avago / Broadcom AppCAD (https://www.broadcom.com/appcad), taking care of the approximation formulas used by the tools for the impedance computation.
  • Page 94 LARA-R2 series - System integration manual LARA Figure 44: Example of the circuit and layout for antenna RF circuits on the application board Guidelines for RF termination design RF terminations must provide a characteristic impedance of 50  as well as the RF transmission lines up to the RF terminations themselves, to match the characteristic impedance of the ANT1 / ANT2 ports of the modules.
  • Page 95 LARA-R2 series - System integration manual If integrated antennas are used, the RF terminations are represented by the integrated antennas themselves. The following guidelines should be followed: • Use antennas designed by an antenna manufacturer, providing the best possible return loss (or VSWR).
  • Page 96 LARA-R2 series - System integration manual Manufacturer Part number Product name Description Taoglas PCS.66.A Reach Wideband Cellular SMD antenna 600..6000 MHz 32.0 x 25.0 x 1.6 mm Taoglas PCS.06.A Havok Cellular SMD Antenna 698..960 MHz, 1710..2170 MHz, 2500..2690 MHz 42.0 x 10.0 x 3.0 mm Antenova SR4L002 Lucida...
  • Page 97 LARA-R2 series - System integration manual Table 34 lists some examples of possible external antennas. Manufacturer Part number Product name Description Taoglas GSA.8827.A.101111 Phoenix Cellular adhesive-mount antenna with cable and SMA(M) 698..960 MHz, 1575.42 MHz, 1710..2170 MHz, 2490..2690 MHz 105 x 30 x 7.7 mm Taoglas GSA.8842.A.105111 Wideband LTE I-Bar adhesive antenna with cable and SMA(M)

  • Page 98: Antenna Detection Interface (Ant_Det)

    LARA-R2 series - System integration manual 2.4.2 Antenna detection interface (ANT_DET) 2.4.2.1 Guidelines for ANT_DET circuit design Figure 46 Table 35 describe the recommended schematic / components for the antennas detection circuit that must be provided on the application board and for the diagnostic circuit that must be provided on the antennas’...
  • Page 99 • Values close to the measurement range maximum limit (approximately 50 k) or an open-circuit “over range” report (see the u-blox AT commands manual [2]) means that that the antenna is not connected or the RF cable is broken. •...

  • Page 100: Sim Interface

    LARA-R2 series - System integration manual 2.5 SIM interface 2.5.1.1 Guidelines for SIM circuit design Guidelines for SIM cards, SIM connectors and SIM chips selection The ISO/IEC 7816, the ETSI TS 102 221 and the ETSI TS 102 671 specifications define the physical, electrical and functional characteristics of Universal Integrated Circuit Cards (UICC) which contains the Subscriber Identification Module (SIM) integrated circuit that securely stores all the information needed to identify and authenticate subscribers over the cellular network.
  • Page 101 LARA-R2 series - System integration manual Guidelines for single SIM card connection without detection A removable SIM card placed in a SIM card holder must be connected to the SIM card interface of LARA-R2 series modules as described in Figure 47, where the optional SIM detection feature is not implemented.
  • Page 102 LARA-R2 series - System integration manual Guidelines for single SIM chip connection A solderable SIM chip (M2M UICC Form Factor) must be connected the SIM card interface of LARA-R2 series modules as described in Figure Follow these guidelines, connecting the module to a solderable SIM chip without SIM presence detection: •...
  • Page 103 LARA-R2 series - System integration manual Guidelines for single SIM card connection with detection A removable SIM card placed in a SIM card holder must be connected to the SIM card interface of LARA-R2 series modules as described in Figure 49, where the optional SIM card detection feature is implemented.
  • Page 104 AT commands (see sections 1.8.2 and 1.12, and the u-blox AT commands manual [2], +UGPIOC, +UDCONF=50 commands), the switch from the first SIM to the second SIM can be properly done when a Low logic level is present on the GPIO5 pin (“SIM not inserted” = SIM interface not enabled), without the necessity of a module re-boot, so that the SIM interface will be re-enabled by the module to use the second SIM when a high logic level is re-applied on the GPIO5.

  • Page 105: Guidelines For Sim Layout Design

    LARA-R2 series - System integration manual FIRST SIM CARD LARA-R2 series VPP (C6) 4PDT VCC (C1 ) C1 1 Analog IO (C7) Switch CLK (C3) 1 VSIM VSIM VSIM 2VSIM RST (C2) 1 DAT SIM_IO GND (C5) 2DAT C2 C3 D1 D2 D3 D4 1 CLK SIM_CLK...

  • Page 106: Data Communication Interfaces

    LARA-R2 series - System integration manual 2.6 Data communication interfaces 2.6.1 Main UART interface 2.6.1.1 Guidelines for UART circuit design Providing the full RS-232 functionality (using the complete V.24 link) If RS-232 compatible signal levels are needed, two different external voltage translators can be used to provide full RS-232 (9 lines) functionality: e.g.
  • Page 107 LARA-R2 series - System integration manual Providing the TXD, RXD, RTS, CTS and DTR lines only (not using the complete V.24 link) If the functionality of the DSR, DCD and RI lines is not required, or the lines are not available: •...
  • Page 108 • Connect the module DTR input to GND using a 0  series resistor, since it may be useful to set DTR active if not specifically handled (see the u-blox AT commands manual [2], &D, S0, +CSGT, +CNMI AT commands) •...

  • Page 109: Providing The Txd And Rxd Lines Only (Not Using The Complete V24 Link)

    • Connect the module DTR input to GND using a 0  series resistor, since it may be useful to set DTR active if not specifically handled (see the u-blox AT commands manual [2], &D, S0, +CSGT, +CNMI AT commands) •...
  • Page 110 LARA-R2 series - System integration manual Additional considerations If a 3.0 V Application Processor (DTE) is used, the voltage scaling from any 3.0 V output of the DTE to the apposite 1.8 V input of the module (DCE) can be implemented, as an alternative low-cost solution, by means of an appropriate voltage divider.

  • Page 111: Auxiliary Uart Interface

    Auxiliary UART interface ☞ The auxiliary UART interface is not supported by the "02B", "62B" and "82B" product versions of the LARA-R202, LARA-R203, LARA-R204, LARA-R220, LARA-R280, and LARA-R281 modules, and by the "02B-00", "02B-01" and "02B-02" product versions of LARA-R211 modules. 2.6.2.1 Guidelines for AUX UART circuit design The auxiliary UART interface can be connected to an application processor for AT command mode.

  • Page 112: Usb Interface

    LARA-R2 series - System integration manual 2.6.3 USB interface 2.6.3.1 Guidelines for USB circuit design The USB_D+ and USB_D- lines carry the USB serial data and signaling. The lines are used in single-ended mode for full speed signaling handshake, as well as in differential mode for high speed signaling and data transfer.
  • Page 113 LARA-R2 series - System integration manual 2.6.3.2 Guidelines for USB layout design The USB_D+ / USB_D- lines require accurate layout design to achieve reliable signaling at the high speed data rate (up to 480 Mb/s) supported by the USB serial interface. The characteristic impedance of the USB_D+ / USB_D- lines is specified by the Universal Serial Bus Revision 2.0 specification [9].

  • Page 114: Hsic Interface

    LARA-R2 series - System integration manual 2.6.4 HSIC interface 2.6.4.1 Guidelines for HSIC circuit design ☞ The HSIC interface is not supported by the "02B", "62B", "82B", and "03B" product versions, except for diagnostic purposes. LARA-R2 series modules include a USB High-Speed Inter-Chip compliant interface with a maximum 480 Mb/s data rate according to the High-Speed Inter-Chip USB Electrical Specification Version [10] and USB Specification Revision 2.0 [9].
  • Page 115 LARA-R2 series - System integration manual 2.6.4.2 Guidelines for HSIC layout design HSIC lines require accurate layout design to achieve reliable signaling at high speed data rates (up to 480 Mb/s), as supported by the HSIC serial interface: signal integrity may be degraded if the PCB layout is not optimal, especially when the HSIC lines are very long.

  • Page 116: Ddc (I2C) Interface

    The “GNSS RTC sharing” function is not supported by the "02B", "62B", "82B", and "03B" versions. The DDC I2C-bus host interface can be used to communicate with u-blox GNSS receivers and other external I2C-bus local devices as an audio codec. Beside the general considerations explained below, see: •...
  • Page 117 • The SDA and SCL pins of the cellular module are directly connected to the related pins of the u-blox 1.8 V GNSS receiver, with appropriate pull-up resistors connected to the 1.8 V GNSS supply enabled after the V_INT supply of the I2C pins of the cellular module.
  • Page 118 Figure implementing the “GNSS supply enable” function. If this feature is not required, the V_INT supply output can be directly connected to the u-blox 1.8 V GNSS receiver, so that it will be switched on when V_INT output is enabled.

  • Page 119: Connection With U-Blox 3.0 V Gnss Receivers

    • The V_BCKP supply output of the cellular module can be directly connected to the V_BCKP backup supply input pin of the GNSS receiver as in the application circuit for a u-blox 1.8 V GNSS receiver. LARA-R2 series u-blox GNSS (except LARA-R204-02B 3.0 V receiver...

  • Page 120: Sdio Interface

    SDIO_D2, SDIO_D3, SDIO_CLK, SDIO_CMD) designed to communicate with an external u-blox short range Wi-Fi module. Combining a u-blox cellular module with a u-blox short range communication module gives designers full access to the Wi-Fi module directly via the cellular module, so that a second interface connected to the Wi-Fi module is not necessary.

  • Page 121: Audio Interface

    For the appropriate selection of a compliant external digital audio device, see section 1.10.1 and see the +UI2S AT command description in the u-blox AT commands manual for further details regarding the capabilities and the possible settings of I2S digital audio interface of LARA-R2 series modules.
  • Page 122 Specific AT commands are available to configure the Maxim MAX9860 audio codec: for more details, see the u-blox AT commands manual [2], +UEXTDCONF AT command. As various external audio codecs other than the one described in Figure 68...
  • Page 123 LARA-R2 series - System integration manual Reference Description Part number - manufacturer 100 nF Capacitor Ceramic X5R 0402 10% 10V GRM155R71C104KA01 – Murata C2, C4, C5, C6 1 µF Capacitor Ceramic X5R 0402 10% 6.3 V GRM155R60J105KE19 – Murata 10 µF Capacitor Ceramic X5R 0603 20% 6.3 V GRM188R60J106ME47 –...
  • Page 124 LARA-R2 series - System integration manual • Optimize the mechanical design of the application device, the position, orientation and mechanical fixing (for example, using rubber gaskets) of microphone and speaker parts in order to avoid echo interference between the uplink path and downlink path. •...

  • Page 125: General Purpose Input/Output (Gpio)

    LARA-R2 series - System integration manual 2.8 General Purpose Input/Output (GPIO) 2.8.1.1 Guidelines for GPIO circuit design A typical usage of LARA-R2 series modules’ GPIOs can be the following: • Network indication provided over GPIO1 pin (see Figure 69 Table 50 below) •...

  • Page 126: Reserved Pins (Rsvd)

    LARA-R2 series - System integration manual 2.9 Reserved pins (RSVD) LARA-R2 series modules have pins reserved for future use, marked as RSVD. All the RSVD pins are to be left unconnected on the application board except the following RSVD pin, as described in Figure •...

  • Page 127: Module Footprint And Paste Mask

    LARA-R2 series - System integration manual 2.11 Module footprint and paste mask Figure 71 Table 51 describe the suggested footprint (i.e. copper mask) and paste mask layout for LARA modules: the proposed land pattern layout reflects the modules’ pins layout, while the proposed stencil apertures layout is slightly different (see the F’’, H’’, I’’, J’’, O’’...

  • Page 128: Thermal Guidelines

    LARA-R2 series - System integration manual 2.12 Thermal guidelines ☞ Modules’ operating temperature range is specified in the LARA-R2 series data sheet [1]. The most critical condition concerning module thermal performance is the uplink transmission at maximum power (data upload in connected mode), when the baseband processor runs at full speed, radio circuits are all active and the RF power amplifier is driven to higher output RF power.

  • Page 129: Esd Guidelines

    Table 52: EMC / ESD immunity requirements as defined by CENELEC EN 61000-4-2, ETSI EN 301 489-1, 301 489-52 2.13.2 ESD immunity test of u-blox LARA-R2 series reference designs Although EMC / ESD certification is required for customized devices integrating LARA-R2 series...

  • Page 130: Esd Application Circuits

    LARA-R2 series - System integration manual The EMC / ESD approved u-blox reference designs consist of a LARA-R2 series module installed onto a motherboard which provides the supply interface, SIM card and communication port. External LTE/3G/2G antennas are connected to the provided connectors.
  • Page 131 LARA-R2 series - System integration manual • If an embedded secondary antenna is used, the insulating enclosure of the device should provide protection up to ±4 kV to direct contact discharge and up to ±8 kV to air discharge to the secondary antenna interface •...
  • Page 132 LARA-R2 series - System integration manual The maximum ESD sensitivity rating of all the other pins of the module is 1 kV (Human Body Model according to JESD22-A114). Higher protection level could be required if the related pin is externally accessible on the application board.

  • Page 133: Schematic For Lara-R2 Series Module Integration

    GND (C5) 47pF 47pF 47pF 47pF 100nF 470k ESD ESD ESD ESD ESD ESD 1.8V DTE 0Ω Not supported by LARA-R204-02B and LARA-R211-02B-00 product version u-blox GNSS 0Ω 3.0 V receiver LDO Regulator 100nF 0Ω GPIO2 SHDNn TCA9406DCUR V_INT I2C Voltage Translator 0Ω...

  • Page 134: Design-In Checklist

    LARA-R2 series - System integration manual 2.15 Design-in checklist This section provides a design-in checklist. 2.15.1 Schematic checklist The following are the most important points for a simple schematic check:  DC supply must provide a nominal voltage at the VCC pin within the operating range limits. ...

  • Page 135: Antenna Checklist

    LARA-R2 series - System integration manual  Optimize placement for minimum length of RF line.  Check the footprint and paste mask designed for LARA-R2 series module as illustrated in section 2.11.  VCC line should be as wide and as short as possible. ...

  • Page 136: Handling And Soldering

    For information pertaining to LARA-R2 series reels / tapes, Moisture Sensitivity levels (MSD), shipment and storage information, as well as drying for preconditioning, see the LARA-R2 series data sheet and the u-blox package information user guide [25]. 3.2 Handling The LARA-R2 series modules are Electro-Static Discharge (ESD) sensitive devices.

  • Page 137: Soldering

    LARA-R2 series - System integration manual 3.3 Soldering 3.3.1 Soldering paste Use of "No Clean" soldering paste is strongly recommended, as it does not require cleaning after the soldering process has taken place. The paste listed in the example below meets these criteria. Soldering Paste: OM338 SAC405 / Nr.143714 (Cookson Electronics) Alloy specification:...

  • Page 138: Optical Inspection

    LARA-R2 series - System integration manual Cooling phase A controlled cooling avoids negative metallurgical effects (solder becomes more brittle) of the solder and possible mechanical tensions in the products. Controlled cooling helps to achieve bright solder fillets with a good shape and low contact angle. •...

  • Page 139: Repeated Reflow Soldering

    ☞ u-blox gives no warranty against damages to the LARA-R2 series modules caused by performing more than a total of two reflow soldering processes (one reflow soldering process to mount the LARA-R2 series module, plus one reflow soldering process to mount other parts).

  • Page 140: Grounding Metal Covers

    ☞ u-blox gives no warranty for damages to the LARA-R2 series modules caused by soldering metal cables or any other forms of metal strips directly onto the EMI covers. 3.3.12 Use of ultrasonic processes LARA-R2 series modules contain components which are sensitive to ultrasonic waves.

  • Page 141: Approvals

    ☞ For the complete list and specific details of the certification schemes approvals, see the LARA-R2 series data sheet [1], or please contact the u-blox office or sales representative nearest you. 4.1 Product certification approval overview Product certification approval is the process of certifying that a product has passed all tests and criteria required by specifications, typically called “certification schemes”...

  • Page 142: Federal Communications Commission Notice

    XPY1EIQN2NN ☞ The LARA-R211 module does not have the FCC grant: the LTE FDD-7 band shall be disabled when operating in United States. For detailed instructions, see the u-blox AT commands manual [2], +UBANDSEL command. 4.2.1 Safety warnings review the structure •...

  • Page 143: Modifications

    Modifications The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved by u-blox could void the user's authority to operate the equipment. ⚠ Manufacturers of mobile or fixed devices incorporating the LARA-R2 series modules are authorized to use the FCC Grants of the LARA-R2 series modules for their own final products according to the conditions referenced in the certificates.

  • Page 144: Innovation, Science, Economic Development Canada Notice

    LARA-R204 cellular modules: 8595A-1EIQN2NN ☞ The LARA-R211 module does not have the ISED grant: the LTE FDD-7 band shall be disabled when operating in Canada. For detailed instructions, see the u-blox AT commands manual [2], +UBANDSEL command. 4.3.1 Declaration of Conformity This device complies with the ISED Canada licence-exempt RSS standard(s).

  • Page 145: Modifications

    4.3.2 Modifications The ISED Canada requires the user to be notified that any changes or modifications made to this device that are not expressly approved by u-blox could void the user's authority to operate the equipment. ⚠ Manufacturers of mobile or fixed devices incorporating the LARA-R2 series modules are authorized to use the ISED Canada Certificates of the LARA-R2 series modules for their own final products according to the conditions referenced in the certificates.
  • Page 146 ⚠ Informations concernant l'exposition aux fréquences radio (RF) La puissance de sortie émise par l’appareil de sans fil u-blox Cellular Module est inférieure à la limite d'exposition aux fréquences radio d'Innovation, Sciences et Développement économique Canada (ISDE). Utilisez l’appareil de sans fil u-blox Cellular Module de façon à minimiser les contacts humains lors du fonctionnement normal.

  • Page 147: European Conformance Ce Mark

    LARA-R2 series - System integration manual 4.4 European Conformance CE mark LARA-R211 and LARA-R281 modules have been evaluated against the essential requirements of the Radio Equipment Directive 2014/53/EU. In order to satisfy the essential requirements of the 2014/53/EU RED, the modules are compliant with the following standards: •...

  • Page 148: Product Testing

    Product testing 5.1 u-blox in-series production test u-blox focuses on high quality for its products. All units produced are fully tested automatically in the production line. A stringent quality control process has been implemented in the production line. Defective units are analyzed in detail to improve production quality.

  • Page 149: Test Parameters For Oem Manufacturers

    (communication with host controller, check SIM interface, GPIOs, etc.), on audio interfaces (audio loop for test purposes can be enabled by the AT+UPAR=2 command as described in the u-blox AT commands manual [2]), and to perform RF functional tests (see following section 5.2.2...
  • Page 150 Follow the instructions suggested in u-blox documentation. u-blox assumes no responsibilities for the inappropriate use of this feature.

  • Page 151: Appendix

    A Migration between SARA-U2 and LARA-R2 A.1 Overview Migrating between u-blox SARA-U2 series 3G / 2G cellular modules and LARA-R2 series LTE Cat 1 / 3G / 2G cellular modules is a straightforward procedure that allows customers to take maximum advantage of their hardware and software investments.
  • Page 152 LARA-R2 series - System integration manual With the u-blox “nested design” solution, any SARA, LARA, LISA or TOBY module can be alternatively mounted on the same space of a single “nested” application board as described in Figure 77, enabling straightforward development of products supporting different cellular radio access technologies.
  • Page 153 ● 1800 SARA-U280 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● LARA-R202 1 ● ● ● ● ● ● ● ■ ● ● ● ● ■ ■ ● ● ● ● ●...

  • Page 154: Pin-Out Comparison Between Sara-U2 And Lara-R2

    2170 SARA-U280 1700 1750 1800 1850 1900 1950 2000 2050 2100 2150 2200 2500 2550 2600 2650 2700 1850 1990 LARA-R202 1700 1750 1800 1850 1900 1950 2000 2050 2100 2150 2200 2500 2550 2600 2650 2700 1710 2155 LARA-R203...
  • Page 155 LARA-R2 series - System integration manual SARA-U2 LARA-R2 Pin no. Pin name Description Pin name Description Remarks for migration UART DTR Input UART DTR Input No functional difference 1.8 V, Internal pull-up: ~14 k 1.8 V, Internal pull-up: ~7.5 k UART RTS Input UART RTS Input No functional difference...
  • Page 156 SARA-U2 and LARA-R2 series modules, see the LARA-R2 series data sheet [1], the SARA-U2 series data sheet [27], the SARA-G3 / SARA-U2 series system integration manual [28], the u-blox AT commands manual and the Nested design application note [26].

  • Page 157: Schematic For Sara-U2 And Lara-R2 Integration

    GND (C5) 47pF 47pF 47pF 47pF 100nF Output ESD ESD ESD ESD ESD ESD 470k 1.8V DTE Not supported by LARA-R204-02B and LARA-R211-02B-00 product version 0Ω u-blox GNSS 3.0 V receiver 0Ω LDO Regulator 0Ω 100nF 0Ω GPIO2 SHDNn 0Ω TCA9406DCUR...

  • Page 158: B Glossary

    LARA-R2 series - System integration manual B Glossary Abbreviation Definition 3GPP 3rd Generation Partnership Project 8-PSK 8 Phase-Shift Keying modulation 16QAM 16-state Quadrature Amplitude Modulation Abstract Control Model Analog to Digital Converter Application Processor APAC Asia-Pacific Access Point Name ASIC Application-Specific Integrated Circuit AT Command Interpreter Software Subsystem Automatic Test Equipment...
  • Page 159 Moisture Sensitive Device Not Applicable Network Control Model NSMD Non Solder Mask Defined Negative Temperature Coefficient Original Equipment Manufacturer device: an application device integrating a u-blox cellular module Over The Air Power Amplifier Pulse Code Modulation Pulse Frequency Modulation Power Management Unit...
  • Page 160 LARA-R2 series - System integration manual Abbreviation Definition Pulse Width Modulation QPSK Quadrature Phase Shift Keying Radio Frequency Radiated Spurious Emission Real Time Clock Specific Absorption Rate Surface Acoustic Wave SDIO Secure Digital Input Output SDN / IN / PCN Sample Delivery Note / Information Note / Product Change Notification Subscriber Identification Module Solder Mask Defined...

  • Page 161: Related Documentation

    [27] u-blox SARA-U2 series data sheet, UBX-13005287 [28] u-blox SARA-G3 and SARA-U2 series system integration manual, UBX-13000995 ☞ For regular updates to u-blox documentation and to receive product change notifications, register on our homepage (www.u-blox.com). UBX-16010573 - R22 Related documentation Page 161 of 163...

  • Page 162: Revision History

    "Disclosure restriction" replaces "Document status" on page 2 and document footer. Updated GPRS / EDGE multi-slot class. Added maximum antenna gain for LARA-R204. Extended the document applicability to LARA-R202-02B and LARA-R203-02B. 19-Apr-2017 sses Updated LARA-R204-02B / LARA-R211-02B product status.
  • Page 163 LARA-R2 series - System integration manual Contact For complete contact information, visit us at www.u-blox.com. u-blox Offices North, Central and South America Headquarters Asia, Australia, Pacific Europe, Middle East, Africa u-blox America, Inc. u-blox Singapore Pte. Ltd. u-blox AG Phone:...

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