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SARA-N2 series

Power-optimized NB-IoT (LTE Cat NB1) modules

System Integration Manual

Abstract

This document describes the features and the system integration of the SARA-N2 series NB-IoT
modules. These modules are a complete and cost efficient solution offering single-band and
dual-band data transmission for the Internet of Things technology in the compact SARA form factor.

www.u-blox.com

UBX-17005143 - R06

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Содержание SARA-N210

Страница 1: ...ent describes the features and the system integration of the SARA N2 series NB IoT modules These modules are a complete and cost efficient solution offering single band and dual band data transmission...

Страница 2: ...X 18005015 End of Life SARA N200 02B 01 06 57 A09 06 UBX 18048558 Mass Production SARA N201 SARA N201 02B 00 06 57 A07 03 UBX 18005015 End of Life SARA N201 02B 01 06 57 A08 05 UBX 18023224 Mass Produ...

Страница 3: ...ntenna interface 16 1 7 1 Antenna RF interface ANT 16 1 7 2 Antenna detection interface ANT_DET 17 1 8 SIM interface 17 1 9 Serial interfaces 17 1 9 1 Asynchronous serial interface UART 17 1 9 2 Secon...

Страница 4: ...VCC supply circuit design 54 2 11 3 Guidelines for antenna RF interface design 55 2 12 Schematic for SARA N2 series module integration 56 2 13 Design in checklist 57 2 13 1 Schematic checklist 57 2 1...

Страница 5: ...x in series production test 68 5 2 Test parameters for OEM manufacturer 68 5 2 1 Go No go tests for integrated devices 69 5 2 2 RF functional tests 69 Appendix 71 A Migration between SARA modules 71 A...

Страница 6: ...ce for IoT devices designed to operate in locations with very limited coverage and requiring low energy consumption to permit a very long operating life with the primary batteries Examples of applicat...

Страница 7: ...NB1 Up to 31 25 kb s UL Up to 27 2 kb s DL Table 2 SARA N2 series NB IoT characteristics summary 1 2 Architecture Figure 1 summarizes the architecture of SARA N2 series modules describing the interna...

Страница 8: ...to VCC Provide a test point on this pin for diagnostic purpose See section 1 6 3 for functional description See section 2 3 1 for external circuit design in Antenna ANT 56 I O RF input output for ant...

Страница 9: ...ctive pull up to VCC See section 1 9 1 for functional description See section 2 6 1 for external circuit design in DDC SCL 27 O I2 C bus clock line I2 C interface is not supported by 02 product versio...

Страница 10: ...internal 32 kHz reference is active the RF section is completely disabled This is the lowest current consumption mode The UART interface is still completely functional and the module can accept and r...

Страница 11: ...e module are generated from the VCC supply by integrated voltage regulators including V_INT digital interfaces supply and VSIM SIM card supply During operation the current drawn by the SARA N2 series...

Страница 12: ...rature and supply voltage VCC voltage ripple Noise in the supply has to be minimized High supply voltage ripple values during RF transmissions in connected mode directly affect the RF compliance with...

Страница 13: ...ltage domain used internally to supply the generic digital interfaces GDI of SARA N2 series modules is also available on the V_INT supply output pin as described in Figure 4 The internal regulator tha...

Страница 14: ...puts representing the start up event The RESET_N line rises suddenly to high logic level due to internal pull up to VCC The V_INT generic digital interfaces supply output is enabled by the integrated...

Страница 15: ...y to reset the modules An abrupt hardware reset occurs on SARA N2 series modules when a low level is applied on the RESET_N input pin for a specific time period In this case the current parameter sett...

Страница 16: ...g how well the RF antenna connection matches the 50 impedance The impedance of the antenna RF termination must match as much as possible the 50 impedance of the ANT pin over the operating frequency ra...

Страница 17: ...3 6 V supporting see 1 9 1 o AT command o FW upgrades by means of the FOAT feature o FW upgrades by means of the dedicated tool Auxiliary UART interface 2 wire unbalanced asynchronous serial interface...

Страница 18: ...figuration with fixed baud rate D0 D1 D2 D3 D4 D5 D6 D7 Start of 1 Byte transfer Start Bit Always 0 Possible Start of next transfer Stop Bit Always 1 tbit 1 Baudrate Normal Transfer 8N1 Figure 7 Descr...

Страница 19: ...ese commands automatically force the module to exit the deep sleep mode 1 9 2 Secondary asynchronous serial interface Secondary UART The secondary auxiliary UART interface is a 2 wire unbalanced async...

Страница 20: ...ds Manual 3 UGPIOC URING AT commands Provide a test point connected to the GPIO1 pin for diagnostic purpose Function Description Default GPIO Configurable GPIOs Network status indication Network statu...

Страница 21: ...pply circuit affects the RF compliance of the device integrating a SARA N2 series module with applicable certification schemes as well as antenna circuit design Very carefully follow the suggestions p...

Страница 22: ...is primarly intended for battery powered applications A Lithium Thionyl Chloride LiSOCl2 battery directly connected to VCC pins is the usual choice for battery powered devices See sections 2 2 1 2 2 2...

Страница 23: ...on the application type an operating life of 5 to 15 years is usually required For these reasons the whole application board should be optimized in terms of current consumption and should carefully ta...

Страница 24: ...ture range 20 C to 85 C Capacity vs temperature behavior battery capacity is highly influenced by the temperature This must be considered to properly estimate the battery life time Capacity vs dischar...

Страница 25: ...called bypass mode See Figure 10 and Table 10 for an example of such an application circuit In this case V_INT can be used to select between bypass and buck boost modes V_INT 0 V Radio Off Bypass mod...

Страница 26: ...oviding a clean low noise VCC voltage profile PWM mode operation it is preferable to select regulators with Pulse Width Modulation PWM mode While in connected mode Pulse Frequency Modulation PFM mode...

Страница 27: ...nF Capacitor Ceramic X7R 0402 10 16 V GRM155R71C104KA01 Murata C8 10 nF Capacitor Ceramic X7R 0402 10 16 V GRM155R71C103KA01 Murata C9 56 pF Capacitor Ceramic C0G 0402 5 25 V GRM1555C1E560JA01 Murata...

Страница 28: ...r Figure 12 and the components listed in Table 12 show a power supply circuit example where the VCC module supply is provided by an LDO linear regulator capable of delivering the specified current It...

Страница 29: ...ESR capacitor e g Kemet T520B107M006ATE015 to avoid voltage undershoot and overshoot at the start and end of a RF transmit burst stabilizing the voltage profle at max Tx power recommended in particul...

Страница 30: ...ltage maximum ratings are not exceeded place the protecting device along the path from the DC source toward the cellular module preferably closer to the DC source otherwise protection functionality ma...

Страница 31: ...al regulator on V_INT V_INT supply output pin provides internal short circuit protection to limit start up current and protect the device in short circuit situations No additional external short circu...

Страница 32: ...processor an open drain output can be directly connected without any external pull up as described in Figure 14 and Table 14 The internal pull up resistor provided by the module pulls the line to the...

Страница 33: ...cable transition it is recommended to strictly follow the layout and cable termination guidelines provided by the connector manufacturer Integrated antenna PCB antennas such as patches or ceramic SMT...

Страница 34: ...s Increase GND keep out i e clearance a void area around the ANT pad on the top layer of the application PCB to at least 250 m up to adjacent pads metal definition and up to 400 m on the area below th...

Страница 35: ...er for electromagnetic structures from Ansys Corporation or using freeware tools like AppCAD from Agilent www agilent com or TXLine from Applied Wave Research www mwoffice com taking care of the appro...

Страница 36: ...routing in parallel to transmission line or crossing the transmission line on buried metal layer Do not route microstrip line below discrete component or other mechanics placed on top layer Two exampl...

Страница 37: ...integrated antenna is used the RF termination is represented by the integrated antenna itself Use an antenna designed by an antenna manufacturer providing the best possible return loss or V S W R Prov...

Страница 38: ...1710 2170 MHz 2500 2690 MHz 42 0 x 10 0 x 3 0 mm Taoglas MCS6 A GSM WCDMA LTE SMD Antenna 698 960 MHz 1710 2690 MHz 42 0 x 10 0 x 3 0 mm Antenova SR4L002 Lucida GSM WCDMA LTE SMD Antenna 698 960 MHz...

Страница 39: ...1710 2170 MHz 2500 2700 MHz 110 0 x 21 0 mm Table 16 Examples of internal antennas with cable and connector Table 17 lists some examples of possible external antennas Manufacturer Part Number Product...

Страница 40: ...KOA Speer J1 SMA Connector 50 Through Hole Jack SMA6251A1 3GT50G 50 Amphenol C3 15 pF Capacitor Ceramic C0G 0402 5 50 V GRM1555C1H150J Murata L2 39 nH Multilayer Inductor 0402 SRF 1 GHz LQG15HN39NJ02...

Страница 41: ...nance Frequency SRF in the range of 1 GHz to improve the RF isolation of load resistor For example Consider an antenna with built in DC load resistor of 15 k Using the dedicated AT command see SARA N2...

Страница 42: ...ere explained The ANT pin is connected to the antenna connector by means of a 50 transmission line implementing the design guidelines described in section 2 4 1 and the recommendations of the SMA conn...

Страница 43: ...pport the additional auxiliary features contacts C4 AUX1 and C8 AUX2 Removable SIM card are suitable for applications where the SIM changing is required during the product lifetime A SIM card holder c...

Страница 44: ...tection e g Tyco Electronics PESD0402 140 on each externally accessible SIM line close to each related pad of the SIM connector ESD sensitivity rating of the SIM interface pins is 1 kV Human Body Mode...

Страница 45: ...ip Reference Description Part Number Manufacturer C1 C2 C3 C4 47 pF Capacitor Ceramic C0G 0402 5 50 V GRM1555C1H470JA01 Murata C5 100 nF Capacitor Ceramic X7R 0402 10 16 V GRM155R71C104KA01 Murata U1...

Страница 46: ...tial V 24 link 3 wire in the DTE DCE serial communication 3 3 V DTE If a 1 8 V Application Processor DTE is used then it is recommended to connect the UART interface of the module DCE by means of appr...

Страница 47: ...ng at VCC voltage level 3 6 V nominal to the apposite 1 8 V input of the DTE can be implemented as an alternative low cost solution by means of an appropriate voltage divider Consider the value of the...

Страница 48: ...recommended to connect the 1 8 V auxiliary UART interface of the module by means of appropriate unidirectional voltage translators using the module V_INT output as 1 8 V supply for the voltage transla...

Страница 49: ...D red SMT 0603 LTST C190KRKT Lite on Technology Corporation T1 NPN BJT Transistor BC847 Infineon Table 23 Components for network indication application circuit Use transistors with at least an integra...

Страница 50: ...o Magnetic Interference affecting module RF and analog parts circuits performance or implement proper countermeasures to avoid any possible Electro Magnetic Compatibility issue Make sure that the modu...

Страница 51: ...o application production process requirements K M1 M1 M2 E G H J E ANT pin B Pin 1 K G H J A D D O O L N L I F F K M1 M1 M2 E G H J E ANT pin B Pin 1 K G H J A D D O O L N L I F F Stencil 150 m Figure...

Страница 52: ...lene carbon disulphide so that the modules are also suitable for applications intended for use in subdivision IIB typical gases are ethylene coke oven gas and other industrial gases and subdivision II...

Страница 53: ...ing wiring exposed to the explosive atmosphere to a level below that which can cause ignition by either sparking or heating effects The following input and equivalent parameters must be considered int...

Страница 54: ...shown that they cannot be subjected to transients from the power supply network In circuits complying with the above two devices are considered to be an infallible assembly For Level of Protection ia...

Страница 55: ...adiating power of SARA N211 modules is compliant to all the applicable 3GPP ETSI standards with a maximum of 250 mW RF average power according to the LTE Cat NB1 Power Class stated in Table 2 The RF t...

Страница 56: ...VCC 68pF SDA SCL 26 27 RSVD GND 18 RESET_N Application Processor Open drain output TP 12 TXD 13 RXD 10 RTS 11 CTS TP TP TXD RXD RI 3 6V DTE GND 0 0 47pF SIM Card Holder CCVCC C1 CCVPP C6 CCIO C7 CCCLK...

Страница 57: ...ns for ESD immunity as required on the application board Any external signal connected to the UART interface pin must be tri stated or set low before applying VCC supply to avoid latch up of circuits...

Страница 58: ...ide 50 characteristic impedance with V S W R at least less than 3 1 recommended 2 1 on operating bands in deployment geographical area Follow the recommendations of the antenna producer for correct an...

Страница 59: ...tive Area EPA The EPA can be a small working station or a large manufacturing area The main principle of an EPA is that there are no highly charging materials near ESD sensitive electronics all conduc...

Страница 60: ...ts will be heated up evenly regardless of material properties thickness of components and surface color Consider the IPC 7530 Guidelines for temperature profiling for mass soldering reflow and wave pr...

Страница 61: ...Profile 50 50 Elapsed time s Figure 32 Recommended soldering profile SARA N2 series modules must not be soldered with a damp heat process 3 3 3 Optical inspection After soldering the module inspect it...

Страница 62: ...soldering to solder the THT components No more than one wave soldering process is allowed for board with a SARA N2 series module already populated on it Performing a wave soldering process on the mod...

Страница 63: ...orms of metal strips directly onto the EMI covers is done at the customer s own risk The numerous ground pins should be sufficient to provide optimum immunity to interferences and noise u blox gives n...

Страница 64: ...es network operators to ensure and verify interoperability between devices and North America networks Operator certification Operator specific approvals required by some mobile network operator such a...

Страница 65: ...ce certification The certification of the application device that integrates a SARA N2 series module and the compliance of the application device with all the applicable certification schemes directiv...

Страница 66: ...ication numbers of the modules according to the IECEx conformity assessment system are IECEx SIQ 18 0004U According to the standards listed above SARA N211 modules are certified with the following mar...

Страница 67: ...pplicable regulatory approval for China CMIIT ID 2018CJ1113 4 5 Taiwanese conformance SARA N200 SARA N211 and SARA N280 modules have the applicable regulatory approval for Taiwan NCC SARA N200 modules...

Страница 68: ...r and receiver power levels Verification of RF characteristics after calibration modulation accuracy power levels and spectrum performance are checked to be within tolerances when calibration paramete...

Страница 69: ...an RF power meter and a signal generator with the assistance of the AT UTEST command over the AT command user interface The AT UTEST command provides a simple interface to set the module to Rx or Tx t...

Страница 70: ...ation Board SARA N2 series ANT Application Processor AT commands Cellular antenna Spectrum Analyzer or Power Meter IN Wideband antenna TX Application Board SARA N2 series Application Processor AT comm...

Страница 71: ...13 12 43 44 46 47 49 50 52 53 33 35 36 38 39 41 42 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 CTS RTS DCD RI V_INT V_BCKP GND CODEC_CLK RESET_N GP...

Страница 72: ...00 1750 1800 1850 1900 1950 2000 2050 2100 2150 2200 824 894 1850 1990 750 700 II II 850 900 800 850 900 950 900 1800 1900 1900 1800 1700 1750 1800 1850 1900 1950 2000 2050 2100 2150 2200 I I VIII VII...

Страница 73: ...th 7 RI UART RI Output V_INT level 1 8 V Driver strength 6 mA RI UART RI Output V_INT level 1 8 V Driver strength 2 mA RI UART RI Output V_INT level 1 8 V Driver strength 2 mA RSVD Reserved Not suppor...

Страница 74: ...pull up L level 0 30 V 0 65 V H level 1 50 V 4 40 V ON L level pulse time 50 s min 80 s max OFF L level pulse time 1 s min PWR_ON Power on Input 200 k internal pull up L level 0 30 V 0 35 V H level 1...

Страница 75: ...h 1 mA Diverse driver strength 25 GPIO4 RSVD GPIO G340 G350 Reserved G300 G310 V_INT level 1 8 V Default GNSS RTC sharing Driver strength 6 mA GPIO4 GPIO V_INT level 1 8 V Default GNSS RTC sharing Dri...

Страница 76: ...ck G340 G350 Reserved G300 G310 V_INT level 1 8 V Driver strength 5 mA I2S_CLK I2S Clock V_INT level 1 8 V Driver strength 2 mA I2S_CLK SPI_CLK I2S Clock5 SPI clock5 V_INT level 1 8 V Driver strength...

Страница 77: ...ded op range 3 0 V 4 3 V Current consumption 2 0A pulse current in 2G recommended 100 F cap 0 5A pulse current in LTE recommended 10uF cap No switch on by applying VCC VCC Module Supply Input Normal o...

Страница 78: ...External Antenna 1k TP u blox 1 8V GNSS Receiver 4 7 k OUT IN GND LDO Regulator SHDN RSVD SDA RSVD SCL 4 7 k 3V6 1V8_GPS SDA2 SCL2 32K_OUT GPIO3 GPIO2 RSVD GPIO4 TxD1 EXTINT0 26 27 24 25 47k VCC RSVD...

Страница 79: ...ctro magnetic Compatibility EMI Electro magnetic Interference ESD Electro static Discharge ESR Equivalent Series Resistance FEM Front End Module FOAT Firmware Over AT commands FW Firmware GND Ground G...

Страница 80: ...l Time Clock RTS Request To Send SAW Surface Acoustic Wave SIM Subscriber Identification Module TBD To Be Defined TP Test Point UART Universal Asynchronous Receiver Transmitter UDP User Datagram Proto...

Страница 81: ...RA R4 series AT Commands Manual Docu No UBX 17003787 15 IEC 60079 0 Explosive atmospheres Part 0 Equipment general requirements 16 IEC 60079 11 Explosive atmospheres Part 11 Equipment protection by in...

Страница 82: ...Regional Office China Beijing Phone 86 10 68 133 545 E mail info_cn u blox com Support support_cn u blox com Regional Office China Chongqing Phone 86 23 6815 1588 E mail info_cn u blox com Support sup...

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