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N21

Hardware User Guide

USIM_RESET 8

DO USIM reset

N21 provides one USIM card interface that is compatible with 1.8V/3V USIM cards. Figure 3-15 shows
the reference design of the USIM card interface.

Figure 3-15 Reference design of USIM card interface

1 uF

CLK

RST

VCC

VPP

GND

UIM card

DATA

GND

SIM-DET

20Ω

USIM_DATA

USIM_CLK

USIM_RESET

USIM_VCC

N21 module

20Ω

10 kΩ

Schematic Design Guidelines



USIM_VCC is the pin to supply power for SIM card and its maximum load is 30 mA. Do not use it
for any other purpose.



Reserve a position for pull-up resistor externally in design since the USIM_DATA pin is not pulled
up internally.



USIM_CLK is the clock signal pin, supporting a clock frequency of 3.25 GHz.



Add ESD protectors, such as ESD diodes or TVS diodes (with a junction capacitance less than
33pF) on the USIM signal lines in applications with a high requirement of ESD protection.



Connect a 20 Ω resistor respectively to USIM_DATA, USIM_RST, and USIM_CLK in series to
enhance the ESD performance.

PCB Layout Guidelines



USIM signals are likely to be jammed by RF radiation, resulting in failure to detect the USIM card.
Place USIM far away from RF circuits.



Place USIM card closed to the module and USIM traces should be as short as possible.



Place ESD protection resistors and components close to USIM card.



Connect the ground of USIM to main ground to enhance jamming capability.

Содержание N21 Series

Страница 1: ...N21 Hardware User Guide Issue 1 2 Date 2018 12 24 Neoway Product Documentation...

Страница 2: ...VIDES INSTRUCTIONS FOR CUSTOMERS TO DESIGN THEIR APPLICATIONS PLEASE FOLLOW THE RULES AND PARAMETERS IN THIS GUIDE TO DESIGN AND COMMISSION NEOWAY WILL NOT TAKE ANY RESPONSIBILITY OF BODILY HURT OR AS...

Страница 3: ...terfaces 7 3 1 Power Supply 7 3 1 1 VBAT 7 3 1 2 VDDIO_2P8 10 3 2 Control Interfaces 10 3 2 1 PWRKEY_N 10 3 2 2 RESET_N 13 3 3 Peripheral Interfaces 14 3 3 1 UART 15 3 3 2 USIM 18 3 4 RF Interface 20...

Страница 4: ...lication Foot Print 32 7 3 Stencil 32 7 4 Solder Paste 32 7 5 SMT Profile 33 8 Safety Recommendations 34 A Conformity and Compliance 35 A 1 Approvals 35 A 2 Chinese Notice 35 A 2 1 CCC Class A Digital...

Страница 5: ...eset controlled by button 13 Figure 3 9 Reset circuit with triode separating 14 Figure 3 10 Reset timing of N21 14 Figure 3 11 UART connection 15 Figure 3 12 Recommended level shifting circuit 1 16 Fi...

Страница 6: ...are User Guide Copyright Neoway Technology Co Ltd All rights reserved v Figure 7 1 N21 bottom dimensions Unit mm 31 Figure 7 2 Recommended PCB foot print Unit mm 32 Figure 7 3 SMT furnace temperature...

Страница 7: ...Table 2 1 IO definition 5 Table 2 2 Pin Description 5 Table 4 1 Operating conditions of N21 25 Table 4 2 Current consumption of N21 Typical 25 Table 4 3 Temperature features of N21 26 Table 4 4 N21 E...

Страница 8: ...e This document is intended for system engineers SEs development engineers and test engineers Revision History Issue Date Changes Revised By 1 0 2018 06 Initial draft Huang Jianlong 1 1 2018 08 Update...

Страница 9: ...n a situation that could cause fatal device damage or even bodily damage Means reader be careful In this situation you might perform an action that could result in module or product damages Means note...

Страница 10: ...coverage and simple peripheral circuits N21 is well applicable for IoT applications that requires low data rate and low power consumption It adopts 22 pin LGA package and its dimensions are 18 mm x 1...

Страница 11: ...al Digital Iterface SIM UART SIM VBAT RF transceiver 32 768KHz Crystal MCU 1 3 Basic Features Parameter Description Physical features Dimensions 18 0 0 15 mm 13 8 0 15 mm 2 5 0 15 mm Package LGA Weigh...

Страница 12: ...3 Application interfaces 4G antenna 50 characteristic impedance 1 UART interface used to send AT commands 1 USIM interface compatible with 1 8V 3V USIM card 2 2 mm embedded eSIM Optional AT commands...

Страница 13: ...in LGA package 2 1 Pad Layout Figure 2 1 shows the pad layout of N21 Figure 2 1 Pin definition of N21 N21 Top View 22 21 20 19 18 17 15 14 13 12 1 2 3 4 5 6 7 8 9 10 11 16 GND GND GND VBAT VBAT PWRKE...

Страница 14: ...1 8V VIL 0 3V 0 36V VOH 1 44V 1 8V VOL 0V 0 4V 3 0 V level feature VIH 2V 3V VIL 0 3V 0 57V VOH 2 28V 3V VOL 0V 0 4V P2 2 8V digital IO VIH min 1 96V VIL max 0 84V VOH min 2 38V VOLmax 0 42V P3 1 1V o...

Страница 15: ...2 Used with AT commands UART Interface UART_TXD 14 DO Data transmitting P2 Used for data transmission Leave these pins floating if not used UART_RXD 13 DI Data receiving P2 DEBUG_UART Interface DEBUG_...

Страница 16: ...performance of customers application Please read the guidelines to design power supply and comply with the correct design principles to obtain the optimal circuit performance Signal Pin I O Function...

Страница 17: ...power supply to clamp the surge voltage before it enters back end circuits Therefore the back end components and the module are protected A large bypass tantalum capacitor 220 F or 100 F or aluminum c...

Страница 18: ...module are protected Place C3 close to the module A large bypass tantalum capacitor 220 F or 100 F or aluminum capacitor 470 F or 1000 F is expected at C1 to reduce voltage drops during bursts Its max...

Страница 19: ...ode to make the drop voltage between a higher input and module power Otherwise Neoway will not provide warranty for product issues caused by this In this situation the diode will obviously decrease th...

Страница 20: ...1 Figure 3 3 Reference design of startup controlled by button ESD N21 module PWRKEY_N S1 Figure 3 4 Reference design of startup controlled by MCU R1 4 7k N21 module PWRKEY_N R2 47k USER_ON Q Figure 3...

Страница 21: ...To use the function of automatic startup once powered up refer to Figure 3 5 Note that this startup design does not support shutdown Prior to turning on the module power on the host MCU and complete t...

Страница 22: ...see Neoway_N21_AT_Command_Manual 3 2 2 RESET_N RESET_N is used to reset the module When the module is working inputting negative pulse for more than 200 ms to RESET_N can trigger the reset process of...

Страница 23: ...RESET_N Q1 R1 To reset the module through high level refer to Figure 3 4 In Figure 3 9 VDD_EXT 3 3V R1 47 k R2 4 7 k 2 8V is recommended for supply voltage at the base of Q1 Figure 3 10 shows the res...

Страница 24: ...14 DO Data transmitting UART_RXD 13 DI Data receiving N21 provides one UART interface that supports automatic baud rate detection The level at the UART interface is 2 8V Figure 3 11 UART connection UA...

Страница 25: ...nd IO_VL2 ranging from 1 5V to 5 5V VCC is the reference voltage of IO_VCC1 and IO_VCC2 ranging from 1 5V to 5 5V EN is the enable pin which works at a voltage of greater than VL 0 2V In the above cir...

Страница 26: ...aud rate is the lower the R2 and R4 values are R1 R3 4 7 k to 10 k The greater the UART baud rate is the lower the R1 and R3 values are Q1 Q2 MMBT3904 or MMBT2222 High speed transistor is better If th...

Страница 27: ...k 4 7 k Q1 Q2 MCU_RXD VCC_IO R4 R1 R5 R6 R3 Q1 Q2 MMBT3904 or MMBT2222 High speed transistor is better MCU_TXD and MCU_RXD are respectively the TX and RX of the MCU while UART_TXD and UART_RXD are re...

Страница 28: ...rnally in design since the USIM_DATA pin is not pulled up internally USIM_CLK is the clock signal pin supporting a clock frequency of 3 25 GHz Add ESD protectors such as ESD diodes or TVS diodes with...

Страница 29: ...nna Design ANT of N21 require a characteristic impedance of 50 Control the impedance of the traces between the pins and antenna to ensure the RF performance An impedance matching circuit such as L net...

Страница 30: ...kdown voltage of the TVS is higher than 15 V PCB Design Guidelines Pour the ground around RF connector Dig as many vias as possible on the ground plane to ensure lowest ground impedance The traces bet...

Страница 31: ...t antenna or embedded Planar Inverted F antenna PIFA Keep external RF wires far away from all disturbing sources especially digital signals and DC DC power if using RF wires The following methods are...

Страница 32: ...ith networks proactively after wake up Therefore users need to send a data transmitting request For details see Neoway_N21_AT_Command_Manual Figure 3 22 shows the reference design of WAKEUP pin Figure...

Страница 33: ...ure 3 24 Figure 3 24 Driving LED with a triode 470 NET_LIGHT N21 Module 4 7K 10K VCC For details see Neoway_21_AT_Command Manual 3 5 3 STATUS STATUS is used to indicate that N21 is started up successf...

Страница 34: ...voltage is too low the module might fail to start If the voltage is too high or there is a voltage burst during the startup the module might be damaged permanently If you use LDO or DC DC to supply po...

Страница 35: ...ing temperature range some of its RF performance indicators might be worse but it can still work properly 4 4 ESD Protection Electronics need to pass ESD tests The following table shows the ESD capabi...

Страница 36: ...B8 880 915MHz 925 960MHz FDD LTE B20 832 862MHz 791 821MHz FDD LTE B28 703 748MHz 758 803MHz 5 2 TX Power and RX Sensitivity Table 5 2 RF TX power of N21 Band Max Power Min Power HD FDD LTE B3 23dBm...

Страница 37: ...All rights reserved 28 6 Mechanical Features 6 1 Dimensions Figure 6 1 N21 dimensions Unit mm 6 2 Label The label is made of materials that are deformation resistant fade resistant and high temperatur...

Страница 38: ...o blur is allowed The material and surface finishing must comply with RoHS directives 6 3 Package N21 modules are packed in sealed bags on delivery to guarantee a long shelf life Follow the same packa...

Страница 39: ...osed to air for more than 48 hours at conditions not worse than 30 C 60 RH bake it at a temperature higher than 90 degree for more than 12 hours before SMT Or if the indication card shows humidity gre...

Страница 40: ...ounting N21 onto Application Board N21 is introduced in 22 pin LGA package This chapter describes N21 foot print recommended PCB design and SMT information to guide users how to mount the module onto...

Страница 41: ...Solder Paste Do not use the kind of solder paste different from our module technique The melting temperature of solder paste with lead is 35 C lower than that of solder paste without lead It is easy...

Страница 42: ...90 s Peak temperature 235 250 C Neoway will not provide warranty for heat responsive element abnormalities caused by improper temperature control For information about cautions in N21 storage and mou...

Страница 43: ...such as hospital or airplane where it might interfere with other electronic equipment Please follow the requirements below in application design Do not disassemble the module without permission from N...

Страница 44: ...rotection against harmful interference in a residential installation A 2 2 Environmental Protection Notice This product is in compliant with China RoHS directives and does not contain any hazardous su...

Страница 45: ...own expense A 3 3 FCC Class B Digital Device Notice This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits a...

Страница 46: ...e Mode DRX Discontinuous Reception eDRX Extended Discontinuous Reception EMC Electromagnetic Compatibility EMI Electro Magnetic Interference ESD Electronic Static Discharge ETSI European Telecommunica...

Страница 47: ...nology Co Ltd All rights reserved 38 RTC Real Time Clock USIM Subscriber Identification Module SRAM Static Random Access Memory TDMA Time Division Multiple Access UART Universal asynchronous receiver...

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