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SARA-N2 / N3 series - System integration manual

UBX-17005143 - R13

Design-in

Page 37 of 95

C1-Public

2.2.1.5

Guidelines for VCC supply circuit design using an 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.

The characteristics of the LDO linear regulator connected to the

VCC

pins should meet the following

prerequisites to comply with the module

VCC

requirements summarized in

Table 5

•

Power capabilities

: the LDO linear regulator with its output circuit must be capable of providing a

proper voltage value to the

VCC

pins and of delivering to

VCC

pins the specified maximum average

current during a transmission at maximum power (see the SARA-N2 series data sheet

[1]

and

SARA-N3 series data sheet

[2]

)

•

Power dissipation

: the power handling capability of the LDO linear regulator must be checked to

limit its junction temperature to the maximum rated operating range (i.e. check the voltage drop
from the maximum input voltage to the minimum output voltage to evaluate the power dissipation
of the regulator)

Figure 17

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 is recommended to configure the LDO linear regulator to generate a voltage supply value slightly
below the maximum limit of the module

VCC

normal operating range. This reduces the power on the

linear regulator and improves the whole thermal design of the supply circuit.

OUT

ADJ

GND

SARA-N2/N3

VCC

GND

3V6

Figure 17: Suggested schematic design for the VCC voltage supply application circuit using an LDO linear regulator

Reference

Description

Part number - Manufacturer

F capacitor ceramic X5R 6.3 V

GRM188R60J106ME47 - Murata

100

F capacitor tantalum 15m



T520B107M006ATE015 - Kemet

29.4 k



resistor

RC0402FR-0729K4L - Yageo Phycomp

4.7 k



resistor

RC0402JR-074K7L - Yageo Phycomp

LDO linear regulator ADJ 800 mA

LP38511TJ-ADJ/NOPB - Texas Instrument

100 nF capacitor ceramic X7R 0402

GCM155R71C104KA55 - Murata

10 nF capacitor ceramic X7R 0402

GRT155R71C103KE01 - Murata

56 pF capacitor ceramic C0G 0402

GRT1555C1E560JA02 - Murata

15 pF capacitor ceramic C0G 0402

GJM1555C1H150JB01 - Murata

Table 12: Suggested components for VCC voltage supply application circuit using an LDO linear regulator

Содержание SARA-N2 Series

Страница 1: ...stract This document describes the features and the system integration of the SARA N2 series and the SARA N3 series NB IoT modules These modules are a complete and cost efficient solution offering fro...

Страница 2: ...End of life SARA N201 SARA N201 02B 00 06 57 A07 03 UBX 18005015 End of life SARA N201 02B 01 06 57 A08 05 UBX 19030865 End of life SARA N210 SARA N210 02B 00 06 57 A07 03 UBX 18005015 End of life SAR...

Страница 3: ...2 1 7 1 Cellular antenna RF interface ANT 22 1 7 2 Bluetooth antenna RF interface ANT_BT 23 1 7 3 Antenna detection interface ANT_DET 23 1 8 SIM interface 23 1 9 Serial interfaces 24 1 9 1 Main primar...

Страница 4: ...e environments 71 2 12 1 General guidelines 71 2 12 2 Guidelines for VCC supply circuit design 72 2 12 3 Guidelines for antenna RF interface design 74 2 13 Schematic for SARA N2 N3 series module integ...

Страница 5: ...5 Taiwanese conformance 87 4 6 Australian conformance 87 5 Product testing 88 5 1 u blox in series production test 88 5 2 Test parameters for OEM manufacturer 88 5 2 1 Go No go tests for integrated de...

Страница 6: ...iring low energy consumption to permit a very long operating life with the primary batteries Examples of applications include and are not limited to smart grids smart metering telematics street lighti...

Страница 7: ...Band 8 900 MHz Band 20 800 MHz SARA N280 Band 28 700 MHz SARA N300 Band 5 850 MHz Band 8 900 MHz Band 20 800 MHz SARA N3105 Band 3 1800 MHz Band 5 850 MHz Band 8 900 MHz Band 20 800 MHz Band 28 700 M...

Страница 8: ...ries modules block diagram The 02 product version of SARA N2 series modules do not support the following interfaces which should not be driven by external devices o Antenna detection o DDC I2C interfa...

Страница 9: ...required certification schemes See section 1 5 1 for description and requirements See section 2 2 1 for external circuit design in GND All 1 3 5 14 20 22 30 32 43 50 54 55 57 58 60 61 63 96 N A Ground...

Страница 10: ...characteristic impedance See section 1 7 2 for description and requirements See section 2 4 2 for external circuit design in ANT_DET All 62 I Input for antenna detection ANT_DET not supported by SARA...

Страница 11: ...up by default See section 1 9 1 and 1 11 for functional description See section 2 6 1 for external circuit design in RI SARA N3 7 O Ring Indicator Circuit 125 RI in ITU T V 24 at V_INT voltage level...

Страница 12: ...2C bus data line Open drain at V_INT voltage level I2C not supported by SARA N2 02 versions I2C not supported by SARA N3 00 versions See section 1 9 4 for functional description See section 2 6 4 for...

Страница 13: ...subsequently enter the active mode SARA N2 N3 series modules are fully ready to operate when in active mode Then the SARA N2 series modules switch from active mode to deep sleep mode whenever possibl...

Страница 14: ...ply VCC If there is no activity for a defined time interval Network paging Data received over UART Expiration of Periodic Update Timer Incoming outgoing data or other dedicated device network communic...

Страница 15: ...mal operating range SARA N2 3 1 V min 4 0 V max SARA N3 3 2 V min 4 2 V max The module cannot be switched on if VCC voltage value is below the normal operating range minimum limit Ensure that the inpu...

Страница 16: ...odes and the influence of the transmitting power level A proper power supply circuit for SARA N2 N3 series modules must be able to withstand the current values present during the data transmission at...

Страница 17: ...witched on When the radio is off the voltage level is low i e 0 V When the radio is on the voltage level is high i e 1 8 V The V_INT voltage regulator output of SARA N3 series modules is disabled i e...

Страница 18: ...level on the PWR_ON input pin normally high due to internal pull up for a valid time period see SARA N3 series data sheet 2 Alternately the RESET_N pin can be held low during the VCC rising edge so th...

Страница 19: ...e non powered mode The external supply is being applied to the VCC inputs The PWR_ON and RESET_N lines rise suddenly to high logic level due to internal pull up Then the PWR_ON line is set low for a p...

Страница 20: ...CPWROFF command allowing storage of current parameter settings in the module s non volatile memory and a clean network detach with the following phases When the CPWROFF AT command is sent the module...

Страница 21: ...ption It is highly recommended to avoid an abrupt hardware reset of the module by forcing a low level on the RESET_N input pin during module normal operation the RESET_N line should be set low only if...

Страница 22: ...amount of reflected power measuring 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 p...

Страница 23: ...d AT command for more details see the SARA N2 N3 series AT commands manual 4 1 8 SIM interface SARA N2 N3 series modules provide a high speed SIM ME interface on the VSIM SIM_IO SIM_CLK and SIM_RST pi...

Страница 24: ...RA N2 series modules Not supported by the 02 product versions o In the V_INT voltage domain 1 8 V or 2 8 V on the SARA N3 series modules Not supported by the 00 product versions 1 9 1 Main primary UAR...

Страница 25: ...isabled by default One shot automatic baud rate detection enabled by default UART works in low power idle mode supporting 4800 9600 19200 38400 57600 b s baud rates 8N1 default frame format The UART i...

Страница 26: ...umption SARA N2 series modules automatically enter deep sleep mode whenever possible that is if there is no data to transmit or receive When in deep sleep mode the UART interface is still completely f...

Страница 27: ...conforming to ITU T V 24 recommendation 7 It operates at V_INT level with voltage value set as per external VSEL pin configuration o 0 V for low data bit or ON state o V_INT i e 1 8 V for high data bi...

Страница 28: ...ART data output functionality see section 1 9 3 and Table 7 GPIO2 pin working at the V_INT 1 8 V voltage domain not supported by 02 product versions CTS pin working at the VCC 3 6 V typical voltage do...

Страница 29: ...PIO4 Last gasp Input to trigger last gasp execution GPIO3 SIM card detection Input to sense external SIM card physical presence GPIO59 GPIO59 HW flow control RTS UART request to send input RTS RTS HW...

Страница 30: ...ND pins The supply circuit affects the RF compliance of the device integrating a SARA N2 N3 series module with applicable certification schemes as well as antenna circuit design Very carefully follow...

Страница 31: ...ered 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 1 3 and 2 2 1 6 2 2 1 7 2 2 1 8 for...

Страница 32: ...data exchange per day i e few bytes in uplink and downlink per day and these are typically battery powered Depending on the application type an operating life of 5 to 15 years is usually required For...

Страница 33: ...behavior and resulting ability to last longer Highest specific energy per unit weight and energy density per unit volume Wide operating temperature range For the selection of the proper battery type t...

Страница 34: ...5Ah ER26500M Titus Battery Size D LiSOCl battery spiral wound 13Ah ER34615M Titus Battery Size C LiSOCl battery spiral wound 5 8Ah LSH14 Saft Size D LiSOCl battery spiral wound 13Ah LSH20 Saft Table 9...

Страница 35: ...ency transforming a 12 V or greater voltage supply to the typical 3 6 V value of the VCC supply The characteristics of the switching regulator connected to VCC pins should meet the following prerequis...

Страница 36: ...520B107M006ATE015 Kemet C3 5 6 nF capacitor ceramic C0G 0402 GRM1555C1H562JE01 Murata C4 6 8 nF capacitor ceramic X7R 0402 GRM155R71H682KA Murata C5 56 pF capacitor ceramic C0G 0402 GRM1555C1H560JA01...

Страница 37: ...r dissipation of the regulator Figure 17 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 deliver...

Страница 38: ...filter noise from clocks and data sources 100 F low ESR capacitor e g Kemet T520B107M006ATE015 to avoid voltage undershoot and overshoot at the start and end of a RF transmit burst stabilizing the vo...

Страница 39: ...t the voltage 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 function...

Страница 40: ...t needed to connect the V_BCKP pin to an external capacitor or battery In this case the date and time are not updated when VCC is disconnected If VCC is always supplied then the internal regulator is...

Страница 41: ...and SARA N3 series data sheet 2 describes the electrical characteristics V_INT can only be used as an output do not connect any external regulator on V_INT V_INT supply output pin provides internal s...

Страница 42: ...can be achieved by mounting an ESD protection e g EPCOS CA05P4S14THSG varistor array close to the accessible point When the PWR_ON input is connected to an external device e g application processor an...

Страница 43: ...nput is connected to an external device e g application processor an open drain output can be directly connected without any external pull up as described in Figure 21 and Table 15 The internal pull u...

Страница 44: ...and then it cannot be changed after switched on If digital I O interfaces are intended to operate at 1 8 V the VSEL pin must be connected to GND as described in Figure 22 SARA N3 series 21 VSEL Figur...

Страница 45: ...B to RF 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 cera...

Страница 46: ...design Proper transition between the ANT pin and the application board PCB must be provided implementing the following design in guidelines for the layout of the application PCB close to the pad desi...

Страница 47: ...e of 50 coplanar waveguide transmission line design for the described 4 layer board layup 35 m 35 m 1510 m L2 Copper L1 Copper FR 4 dielectric 1200 m 400 m 400 m Figure 26 Example of 50 coplanar waveg...

Страница 48: ...gital lines and from any sensitive circuit as analog audio lines Avoid stubs on the transmission line Avoid signal routing in parallel to transmission line or crossing the transmission line on buried...

Страница 49: ...ge enough according to the related integrated antenna requirements the ground plane of the application PCB can be reduced to a minimum size that must be similar to one quarter of wavelength of the min...

Страница 50: ...Hz 2300 2400 MHz 2490 2690 MHz 35 0 x 8 5 x 3 2 mm Ethertronics P822601 Cellular SMD Antenna 698 960 MHz 1710 2170 MHz 2490 2700 MHz 50 0 x 8 0 x 3 2 mm Ethertronics P822602 Cellular SMD Antenna 698 9...

Страница 51: ...0 MHz 1710 2170 MHz 2500 2700 MHz 110 0 x 21 0 mm Table 17 Examples of internal antennas with cable and connector Table 18 lists some examples of possible external antennas Manufacturer Part number Pr...

Страница 52: ...2 J1 Z0 50 Z0 50 Z0 50 ohm Antenna assembly R2 C4 L3 Radiating element Diagnostic circuit GND L2 C3 Figure 28 Suggested schematic for antenna detection circuit on application PCB and diagnostic circui...

Страница 53: ...a Furthermore any other DC signal injected to the RF connection from ANT connector to radiating element will alter the measurement and produce invalid results for antenna detection It is recommended t...

Страница 54: ...9 is here 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 SM...

Страница 55: ...e modules do not support 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...

Страница 56: ...SD protection 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 Bod...

Страница 57: ...9 SIM_IO 38 SIM_CLK 40 SIM_RST SIM chip SIM chip bottom view contacts side C1 VPP C6 VCC C1 IO C7 CLK C3 RST C2 GND C5 C2 C3 C5 U1 C4 2 8 3 6 7 1 C1 C5 C2 C6 C3 C7 C4 C8 8 7 6 5 1 2 3 4 SARA N2 N3 Fig...

Страница 58: ...SIM interface pins is 1 kV HBM according to JESD22 A114 so that according to the EMC ESD requirements of the custom application higher protection level can be required if the lines are externally acc...

Страница 59: ...g inputs In the second case the same harmonics can be picked up and create self interference that can reduce the sensitivity of the receiver channels whose carrier frequency is coincidental with harmo...

Страница 60: ...ces of the module DCE are configured to operate at 1 8 V V_INT 1 8 V if the VSEL pin is connected to GND see 1 5 3 the circuit should be implemented as described in Figure 33 TxD Application processor...

Страница 61: ...R 10 RI 11 DCD GND 0 0 TP TP 21 VSEL Figure 35 SARA N3 series UART application circuit with TXD RXD RTS and CTS lines connection 1 8 V DTE 1 8 V DCE If a 2 8 V application processor DTE is used and th...

Страница 62: ...1 8 V DCE If a 2 8 V application processor DTE is used and the generic digital interfaces of the module DCE are configured to operate at 2 8 V V_INT 2 8 V if the VSEL pin is left unconnected see 1 5 3...

Страница 63: ...D GND SARA N2 DCE 12 TXD 13 RXD GND 0 TP 0 TP 52 VCC 3V3 3V3 VCC 51 VCC 53 VCC Figure 39 SARA N2 series UART interface application circuit with TXD and RXD lines connection to 3 3 V DTE If a 1 8 V App...

Страница 64: ...Consider the value of the pull up integrated at the input of the Application Processor DTE if any for the correct selection of the voltage divider resistance values Mind that any DTE signal connected...

Страница 65: ...gure 43 TxD Application processor 2 8V DTE RxD GND SARA N3 series 2 8V DCE 17 TXD_AUX 19 RXD_AUX GND 21 VSEL Figure 43 SARA N3 series UART AUX application circuit with TXD_AUX RXD_AUX lines connection...

Страница 66: ...to VSEL input pin external configuration see 1 5 3 as additional UART interface for Firmware update and diagnostic Trace logs collection A suitable application circuit can be similar to the one illust...

Страница 67: ...as illustrated in Figure 46 SARA N3 series ADC1 R2 33 Voltage R1 Figure 46 ADC application circuit example The ESD sensitivity rating of the ADC1 pin is 1 kV HBM according to JESD22 A114 Higher prote...

Страница 68: ...y Corporation T1 NPN BJT Transistor BC847 Infineon Table 24 Components for network indication application circuit Use transistors with at least an integrated resistor in the base pin or otherwise put...

Страница 69: ...Electro 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 t...

Страница 70: ...m according to 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 Stenci...

Страница 71: ...e in which the equipment may be installed typical gases are hydrogen acetylene carbon disulfide so that the modules are also suitable for applications intended for use in subdivision IIB typical gases...

Страница 72: ...10 module in an application device intended for use in potentially explosive atmospheres Total internal capacitance Ci see Table 26 Total internal inductance Li see Table 26 The module does not contai...

Страница 73: ...us may use series current limiters consisting of controllable and non controllable semiconductor devices The use of semiconductors and controllable semiconductor devices as current limiting devices fo...

Страница 74: ...device The RF threshold power of the application device integrating a SARA N211 or SARA N310 module must not exceed the limits shown in Table 27 according to the IEC 60079 0 ATEX standard 10 Gas grou...

Страница 75: ...51 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 33pF SIM card holder CCVCC C1 CCVPP C6 CCIO C7 C...

Страница 76: ...62 ANT_DET 10k 27pF ESD 68nH 56 Connector External antenna 33pF ANT 39nH 15pF 15pF 100nF VCC 1V8 GND 15 PWR_ON Open drain output TP RTS 7 RI RI SDA SCL 26 27 33pF SIM card holder CCVCC C1 CCVPP C6 CCI...

Страница 77: ...be tri stated or set low before applying VCC supply to avoid latch up of circuits and let a proper boot of the module Any external signal connected to any generic digital interface pin must be tri st...

Страница 78: ...ed on establishing an Electrostatic Protective 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...

Страница 79: ...rature and all parts 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...

Страница 80: ...ring Profile 50 50 Elapsed time s Figure 51 Recommended soldering profile SARA N2 N3 series modules must not be soldered with a damp heat process 3 3 3 Optical inspection After soldering the module in...

Страница 81: ...wave soldering to solder the THT components No more than one wave soldering process is allowed for board with a SARA N2 N3 series module already populated on it Performing a wave soldering process on...

Страница 82: ...er forms 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 giv...

Страница 83: ...ure and verify interoperability between devices and North America networks Operator certification o Operator specific approvals required by some mobile network operator such as China Telecom network o...

Страница 84: ...device with all the applicable certification schemes directives and standards are the sole responsibility of the application device manufacturer 4 2 European Conformance SARA N200 SARA N210 SARA N211...

Страница 85: ...ules are certified as components intended for use in potentially explosive atmospheres compliant to the following standards IEC 60079 0 IEC 60079 11 IEC 60079 26 The certification numbers of the modul...

Страница 86: ...n the sub division IIC IIB and IIA Parameter SARA N211 SARA N310 Ui 4 2 V 4 2 V Ii 0 5 A 0 5 A Ci 68 1 F 42 2 F Li 8 5 H 11 4 H Table 29 Maximum input and equivalent intrinsically safe parameters for...

Страница 87: ...AI17Z10200T2 CCAI1 7Z1 0200T2 SARA N310 modules NCC ID CCAF20NB0010T1 CCAF20NB001 0T1 4 6 Australian conformance Radiofrequency radiation exposure Information this equipment complies with radiation ex...

Страница 88: ...and receiver power levels Verification of RF characteristics after calibration modulation accuracy power levels and spectrum performance are checked to be within limits with calibration parameters ap...

Страница 89: ...mand over the AT command user interface The AT UTEST command provides a simple interface to set the SARA N2 N3 series modules to Rx or Tx test modes ignoring the cellular signaling protocol The comman...

Страница 90: ...test Application board SARA N2 N3 ANT Application processor AT commands Cellular antenna Spectrum analyzer or power meter IN Wideband antenna TX Application board SARA N2 N3 Application processor AT c...

Страница 91: ...rective Cat Category CoAP Constrained Application Protocol CTS Clear To Send DC Direct Current DCD Data Carrier Detect DCE Data Communication Equipment DDC Display Data Channel interface DL Down link...

Страница 92: ...r PCM Pulse Code Modulation PCN Sample Delivery Note Information Note Product Change Notification PFM Pulse Frequency Modulation PMU Power Management Unit PSM Power Saving Mode PWM Pulse Width Modulat...

Страница 93: ...nterchange circuits between the Data Terminal Equipment DTE and the Data Circuit terminating Equipment DCE http www itu int rec T REC V 24 200002 I en 8 I2C bus specification and user manual Rev 5 9 O...

Страница 94: ...N200 02B 01 SARA N210 02B 01 SARA N211 02X 01 SARA N280 02B 01 R06 30 Nov 2018 lpah SARA N200 02B 01 SARA N210 02B 01 SARA N211 02X 01 SARA N280 02B 01 product status update R07 08 Mar 2019 sses Exten...

Страница 95: ...ox com 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 Supp...

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