Neoway N58 Hardware User's Manual
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Neoway N58 Hardware User's Manual

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Hardware User Guide
Issue 2.2 Date 2020-11-05

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Summary of Contents for Neoway N58

  • Page 1 Hardware User Guide Issue 2.2 Date 2020-11-05...
  • Page 2 THIS GUIDE PROVIDES 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 ASSET LOSS CAUSED BY IMPROPER OPERATIONS. THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE DUE TO PRODUCT VERSION UPDATE OR OTHER REASONS.

  • Page 3: Table Of Contents

    Scope ..............................vii Audience ............................vii Change History ..........................vii Conventions ............................. viii Related Documents .......................... viii 1 About N58 ....................9 1.1 Product Overview ......................... 9 1.2 Block Diagram ..........................10 1.3 Basic Features ..........................11 2 Module Pins ..................... 13 2.1 Pad Layout ..........................
  • Page 4 6.2 Label ............................61 6.3 Packing ............................62 6.3.1 Reel ........................... 62 6.3.2 Moisture ..........................64 7 Mounting N58 Onto Application PCB ............65 7.1 Bottom Dimensions ........................65 7.2 Application Foot Print ......................... 66 7.3 Stencil ............................66 7.4 Solder Paste ..........................67 7.5 SMT Furnace Temperature Curve ....................
  • Page 5 Table of Figures Table of Figures Figure 1-1 Block Diagram ........................ 10 Figure 2-1 N58 pin definition ......................13 Figure 3-1 Recommended design 1 ....................23 Figure 3-2 Recommended design 2 ....................23 Figure 3-3 Recommended design 3 ....................24 Figure 3-4 Reference design of startup controlled by button ............
  • Page 6 Figure 6-2 N58 label ......................... 62 Figure 7-1 Bottom dimensions of N58 (Unit: mm) ................65 Figure 7-2 Recommended footprint of N58 application PCB (Unit: mm) ......... 66 Figure 7-3 SMT furnace temperature curve ..................67 Copyright © Neoway Technology Co., Ltd...
  • Page 7 Table 4-4 N58 ESD protection ......................56 Table 5-1 Operating Bands of N58 ....................57 Table 5-2 RF transmit power and RX sensitivity of N58..............58 Table 5-3 N58 GSM RX sensitivity ....................58 Table 5-4 N58 LTE RX sensitivity ..................... 59 Table 5-5 GNSS Feature ........................
  • Page 8 About This Document Scope This document is applicable to N58 series. It defines the features, indicators, and test standards of the N58 module and provides a reference for the hardware design of each interface. Audience This document is intended for system engineers (SEs), development engineers, and test engineers.
  • Page 9 Means reader be careful. In this situation, you might perform an action that could result in module or product damages. Means note or tips for readers to use the module Related Documents Neoway_N58_Datasheet Neoway_N58_Product_Specifications Neoway_N58_AT_Command_Mannual Neoway_N58_EVK_User_Guide Copyright © Neoway Technology Co., Ltd viii...

  • Page 10: About N58

    Chapter 1 About N58 1 About N58 N58 is an industrial 4G module that is developed on Spectrum chipset. Its dimensions are 30 mm x 28 mm x 2.6 mm. This module supports GSM, FDD-LTE, TDD-LTE(Cat 1) network modes, provides various hardware interfaces, supports audio and video functions and BT connectivity, and optionally supports GNSS.

  • Page 11: Block Diagram

    N58 Hardware User Guide Chapter 1 About N58 1.2 Block Diagram N58 consists of the following functionality units: Baseband ⚫ 26MHz crystal ⚫ Power management unit ⚫ RF section ⚫ Digital interfaces (USIM, I2C, SPI, KEYPAD, UART, USB, SDIO, etc.) ⚫...

  • Page 12: Basic Features

    One LCD interface, supports the LCD screen with SPI interfaces One CAM interface, supports SPI interfaces One 12-bit ADC interface, detectable voltage ranging from 1 V to VBAT. One SDIO interface, used for SD card One 1PPS interface Copyright © Neoway Technology Co., Ltd...
  • Page 13 AT commands Neoway extended commands PDU, TXT Data PPP, RNDIS, ECM Protocol TCP, UDP, MQTT, FTP, HTTP/HTTP(S), SSL, TLS Certification approval CCC, SRRC, RoHS, CE * indicates functions that will be supported in the future. Copyright © Neoway Technology Co., Ltd...

  • Page 14: Module Pins

    N58 Hardware User Guide Chapter 2 Module Pins 2 Module Pins There are 192 pins on N58 and their pads are introduced in LGA + LCC package. 2.1 Pad Layout Figure 2-1 shows the pad layout of N58. Figure 2-1 N58 pin definition...

  • Page 15: Pin Description

    VBAT 27, 28, 29 =3.8V supplies at least 2.5A norm supply input =4.2V current to VBAT 1.8V power =1.8V Used only for level shifting norm VDD_1P8 output =50 mA and IO power supply. Copyright © Neoway Technology Co., Ltd...
  • Page 16 UART1_RTS Request to send is not used. UART2 Interface UART2_TX Data transmitting P3 AT by default. Used for data transmission module commissioning. UART2_RX Data receiving Leave this pin floating if it is not used. Copyright © Neoway Technology Co., Ltd...
  • Page 17 5.2V, TYP: differential mode, check control impedance of 90Ω USB_DM USB data minus Leave this pin floating if it is not used. USB_DP USB data plus USB_ID OTG detect Leave this pin floating if it Copyright © Neoway Technology Co., Ltd...
  • Page 18 Leave this pin floating if it LCD_SPI_SEL Select signal 1.8V/3.0V is not used. Outputs 1.8V by default VDD_LCD DC power supply 1.6V/3.2V Disabled by default Max current: 200mA RGB LED input Max current: 100mA LED_K0 negative Copyright © Neoway Technology Co., Ltd...
  • Page 19 Leave this pin floating if it SDC_DATA_3 SDIO data bit 3 1.8V/3.0V is not used. Leave this pin floating if it SDC_CMD SDIO command 1.8V/3.0V is not used. SDC_CLK SDIO clock 1.8V/3.0V Leave this pin floating if it Copyright © Neoway Technology Co., Ltd...
  • Page 20 GPIO_2 GPIO is not used. Leave this pin floating if it GPIO_3 GPIO is not used. Audio SPK interface signal SPK_P positive signal SPK_N negative Audio MIC interface signal MIC_P positive signal MIC_N negative Copyright © Neoway Technology Co., Ltd...
  • Page 21 Time service The precision is less than 1PPS output 30 ns. Keypad interfaces KEYOUT3 Keypad output KEYOUT2 Keypad output KEYOUT1 Keypad output KEYOUT0 Keypad output KEYIN1 Keypad input KEYIN2 Keypad input KEYIN3 Keypad input Copyright © Neoway Technology Co., Ltd...
  • Page 22 144, 145, 148, 154 * Pin 9 and pin 10 of the N58 variant without GPS can be used as UART4 interface (pin 9 is UART4_TX, pin 10 is UART4_RX, and the interface level is 1.8V), and pin 89 of the module can be used as ADC2 interface (ADC2 interface characteristics are the same as ADC1).

  • Page 23: Application Interfaces

    The power supply design covers two parts: schematic design and PCB layout. Schematic Design N58 supports a power supply of 3.4V to 4.2V (3.8 V typically, supplied by battery) Figure 3-1 shows the schematic design recommended. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 24: Figure 3-1 Recommended Design 1

    Figure 3-2 Recommended design 2 VIN (3.8V) VBAT 10 μF 0.1 μF 470 μF 33 pF 100pF 10 μF 0.1 μF Ω 100 k PWR_EN Ω Ω 10 k Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 25: Figure 3-3 Recommended Design 3

    Its withstand voltage should be larger than 1.5 times the voltage of the power supply. Place a bypass capacitor of low-ESR close to the module to filter out high-frequency jamming ⚫ from the power supply. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 26: Vdd_1P8

    2.5 A. Ensure low resistance of power supply trace in design to avoid voltage drop. Never use a diode to make the drop voltage between a higher input and module power. Otherwise, Neoway will not provide a warranty for product issues caused by this. In this situation, the diode will obviously decrease the module performances, or result in unexpected restarts, due to the forward voltage of the diode will vary greatly in different temperature and current.

  • Page 27: Figure 3-4 Reference Design Of Startup Controlled By Button

    Figure 3-5 Reference design of startup controlled by MCU PWRKEY N USER 4.7 Ω 47k Ω module Figure 3-6 Reference design of automatic start once powered up PWRKEY N 470 Ω module Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 28: Figure 3-7 Startup Process

    PWRKEY_N is used to hardware power off the module. When the module is working, inputting negative pulses for more than 2 seconds to PWRKEY_N can trigger the power-off state of the module. Figure 3-10 shows the hardware shutdown timing. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 29: Reset_N

    Figure 3-9 Reset controlled by button 1 kΩ RESET_N module If you use a 1.8V/2.8V/3.0V IO system, it is recommended to add a triode to separate it. Refer to the following designs. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 30: Psm_Wakeup

    N58 Hardware User Guide Chapter 3 Application Interfaces Figure 3-10 Reset circuit with triode separating RESET USER 4.7 Ω 47k Ω module The following figure shows the reset process of N58. Figure 3-11 N58 reset process VBAT RESET_N 50ms Active Inactive 3.2.3 PSM_WAKEUP PSM_WAKEUP is the control pin of sleep mode, it needs to be used together with AT commands.

  • Page 31: Peripheral Interfaces

    Leave this pin floating if it is not used. USB can be used to download firmware for N58 and establish data communication for commissioning. The module can be used as a USB Device. It is an option for customers. The recommended USB circuit is shown in Figure 3-12.

  • Page 32: Uart

    N58 provides pins to configure three UART interfaces, two of which support hardware flow control. The UART interfaces support 2 Mbps at most. The level at the interfaces is 1.8V. Figure 3-13 shows the reference design of the UART interface.

  • Page 33: Figure 3-13 Uart Connection

    VDD_1P8 VCC_IO IO_VCC1 IO_VL1 MCU_RXD UART_TXD IO_VL2 IO_VCC2 UART_RXD MCU_TXD 0.1μF VDD_1P8 NLSX4373 0.1μF NLSX4373 is a dual-supply level shifter, the rate of which can be up to 20 Mb/s. ⚫ Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 34: Usim

    DO USIM2 reset USIM2_DET USIM2 detect N58 provides pins to configure two USIM card interfaces and supports dual-SIM single standby. SIM1 is used by default. The two interfaces are automatically compatible with 1.8V/3V USIM cards. See Figure 3-15. Figure 3-15 Reference design of USIM card interface 20Ω...

  • Page 35: Sdio

    Connect a 20 Ω resistor respectively to USIM_DATA, USIM_RST, USIM_CLK, and USIM_DET in ⚫ series to enhance the ESD performance. N58 supports USIM card detection. USIM_DET is a 1.8V interrupt pin. The USIM detection ⚫ circuit works by checking the levels across the USIM_DET pin before and after a USIM card is inserted.

  • Page 36: Figure 3-16 Sdio Connection

    SDC_DET is left unconnected before an SD card is inserted and grounded after an SD card is inserted, and the level at SDC2_DET changes from high to low. PCB Design Guidelines Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 37: Spi

    SPI _ MISO MISO SPI _ MOSI MOSI SPI _ CS _ N SPI _ CLK module SPI device （Master） （Slave） 3.3.6 I2C Signal Function Remarks I2C_SDA I2C data I2C_SCL I2C clock Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 38: Audio Interface

    N58 Hardware User Guide Chapter 3 Application Interfaces N58 provides two I2C interfaces that supports a maximum rate of 3.4 Mbps and a reference high level of 1.8V. 3.4 Audio Interface N58 provides a few of audio input/output interfaces to meet your demands for the audio function.

  • Page 39: Analog Audio Output Interfaces

    Class AB output by default. Differential Mode Figure 3-19 Schematic of differential SPK output 33pF SPK_P 33pF SPK_N 33pF C2, C3, and C4 are capacitors to filter out jamming frequencies. ⚫ Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 40: Figure 3-20 Reference Design Of The External Power Amplifier Connection In Spk Differential Mode

    Comply with differential rules. ⚫ SPK interface the N58 module is differential output and does not support single-ended mode. Reference Design of External Power Amplifier Connection Figure 3-20 Reference design of the external power amplifier connection in SPK differential mode VBATT 2.2UF...

  • Page 41: Lcd And Cam Interfaces

    N58 Hardware User Guide Chapter 3 Application Interfaces Connect the SPK output of the N58 module to the power amplifier with differential connection, ⚫ and select a power amplifier that can support differential input for the audio power amplifier. The recommended power amplifier models are AW87317CSR and AW8737SCSR. For specific ⚫...

  • Page 42: Camera

    The module provides one ADC channel, and the input voltage ranges from 0.1 V to VBAT. The ADC interface supports the highest precision of 12 bit and it can be used for temperature detection and other checks. For details, see Neoway_N58_AT_Command Manual. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 43: Dtr

    Enter sleep mode at high level Exits from sleep mode at low level Pull DTR low Whether the module Processing current is in idle state services Enter sleep mode and disable all interfaces Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 44: Figure 3-22 Incoming Call Service Process

    Figure 3-23 Outgoing call service process Sleep mode Initiate an outgoing service MCU pulls SLEEP pin high Enable UART and process outgoing service Complete service Wait till service is processing? processed MCU pulls SLEEP pin Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 45: Netlight

    Do not use NET_LIGHT to drive the LED indicator directly since it outputs a high level of 1.8V. It is recommended to drive the LED indicator by controlling a triode. Figure 3-25 Driving LED with a triode module 1KΩ 4 7 k Ω NETLIGHT 47k Ω Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 46: Ring

    Add an ESD component to protect USB_BOOT in a circuit. The following figure shows the reference design of this pin. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 47: Vrtc_Gps And Vrtc

    Figure 3-29 Reference design of VRTC and VRTC_GPS power supply 0Ω VRTC_GPS Backup RTC circuit Battery or Farad Cap Module 0Ω VRTC Backup RTC circuit Battery or Farad Cap Module Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 48: Gpio

    Leave this pin floating if it is not used. Control the enable of external GPS_LAN. 3.6.9 Keypad Interfaces N58 supports the matrix keyboard (4x3). Key pressing and releasing can be detected. It can detect the composition of any two keys. Signal...

  • Page 49: 1Pps

    BT antenna 3.7.1 ANT Interface ANT BT and GNSS antenna of N58 require a characteristic impedance of 50 Ω. You should control the impedance of the traces between the pins and antenna to ensure the RF performance. An impedance matching circuit, such as the L network, split capacitor network, and pi network is mandatory in between.

  • Page 50: Figure 3-31 L Network

    0.5 pF. Ensure that the reverse breakdown voltage of the TVS is greater than 10V (above 15 V is recommended). PCB Design Guidelines Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 51: Ant_Gnss Interface

    3.7.2 ANT_GNSS Interface GPS Impedance Control ANT_GNSS (92nd pin) is the GNSS RF interface of N58, which requires a characteristic impedance of 50Ω. Figure 3-35 shows the GNSS structure inside the module. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 52: Figure 3-35 Gnss Rf Structure

    Reference design of active GNSS antenna After the antenna receives GNSS satellite signals, the LNA amplifies the signals first and then transmits them to the ANT_GNSS of N58 through feeder and PCB traces. Figure 3-36 shows a reference design of the active GNSS antenna.

  • Page 53: Ant_Bt And Ant_Wlan Interface

    Otherwise, these two parts will jam each other, lowing the RF performance. 3.7.3 ANT_BT and ANT_WLAN Interface The 94th pin of the N58 module is shared by WLAN and Bluetooth. It has a characteristic impedance of 50Ω. For the design and requirements of the WLAN antenna and Bluetooth antenna, see 3.7.1.

  • Page 54: Figure 3-37 Specifications Of Mm9329-2700Ra1

    PCB after the design phase is completed. They are used only for 2.4G Wi-Fi or Bluetooth because they cannot cover wide frequencies. The following figure shows the layout of the 2.4G ceramic chip antenna. SLDA52-2R540G-S1TF is used as an example. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 55: Figure 3-39 Antenna Layout

    5 Space between the antenna and ground area. Figure 3-40 shows the layout of this area. Figure 3-40 Layout around the antenna For more details, refer to the antenna manuals and other documents. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 56: Electric Feature And Reliability

    Chapter 4 Electric Feature and Reliability 4 Electric Feature and Reliability This chapter describes the electric features and reliability of N58, including the current and voltage of each power pin, operating and storage temperature ranges, and ESD protection features. 4.1 Electric Features...

  • Page 57: Esd Protection

    Humidity 45% Temperature 25°C Table 4-4 N58 ESD protection Testing Point Contact Discharge Air Discharge ± 8KV ± 15KV ± 8KV ± 15KV Cover ± 8KV ± 15KV Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 58: Rf Features

    N58 Hardware User Guide Chapter 5 RF Features 5 RF Features N58 supports network modes including GSM, FDD-LTE, TDD-LTE(Cat 1), supports wireless connectivities of WLAN and BT, and optionally supports GNSS. This chapter describes the RF features of N58. 5.1 Operating Bands...

  • Page 59: Tx Power And Rx Sensitivity

    N58 Hardware User Guide Chapter 5 RF Features 5.2 TX Power and RX Sensitivity Table 5-2 RF transmit power and RX sensitivity of N58 Band Max Power Min. Power GSM850 33dBm+2/-2dBm 5dBm+2/-2dB EGSM900 33dBm+2/-2dB 5dBm+2/-2dB DCS1800 30dBm+2/-2dB 0dBm+2/-2dB PCS1900 30dBm+2/-2dBm...

  • Page 60: Gnss Features

    GPS L1 operating frequency 1575.42± 1.023MHz GLONASS operating frequency 1597.5~1605.9 MHz BDS operation frequency 1559.1~1563.1 MHz Tracking sensitivity -160 dBm Acquisition sensitivity -154 dBm Positioning precision (in air) < 3m (CEP50) Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 61: Wlan/Bt Features

    Table 5-6 WLAN/BT TX power and RX sensitivity Receiving Operating Bands Rate Transmit power Sensitivity 802.11b (2.4G) 1/2/5.5/11Mbps 6/9/12/18/24/36Mbps 802.11g (2.4G) 48/54Mbps MCS0~MCS4 802.11n (2.4G, 20MHz) MCS5~MCS7 GFSK π/4-DQPSK Bluetooth 8-DPSK Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 62: Mechanical Features

    6.1 Dimensions Figure 6-1 N58 dimensions (Unit: mm) 30±0.15 28.82± 0.15 0.8±0.15 6.2 Label The label information is laser carved on the cover. The following figure shows the label of N58. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 63: Packing

    The material and surface finishing must comply with RoHS directives. ⚫ 6.3 Packing N58 modules are packed in sealed bags on delivery to guarantee a long shelf life. Follow the same package of the modules again in case of opened for any reason. 6.3.1 Reel N58 in mass production is delivered in the following packaging.
  • Page 64 Tape dimensions ITEM 44.0 28.7 28.70 40.4 1.75 20.2 3.55 36.0 0.30 +0.3 +0.1 +0.1 +0.1 +0.1 +0.1 TOLE ±0.1 ±0.10 ±0.1 ±0.1 ±0.1 ±0.05 -0.3 -0.1 -0.1 -0.0 -0.0 -0.1 Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 65: Moisture

    Chapter 6 Mechanical Features Reel dimensions 6.3.2 Moisture N58 is a level 3 moisture-sensitive electronic elements, in compliance with IPC/JEDEC J-STD-020 standard. If the module is exposed to air for more than 48 hours at conditions not worse than 30°C/60% RH, bake it at a temperature higher than 90 °C for more than 12 hours before SMT.

  • Page 66: Mounting N58 Onto Application Pcb

    N58 Hardware User Guide Chapter 7 Mounting N58 Onto Application PCB 7 Mounting N58 Onto Application PCB This chapter describes the package of N58, the recommended footprint of the application PCB, and SMT specifications. 7.1 Bottom Dimensions Figure 7-1 Bottom dimensions of N58 (Unit: mm)

  • Page 67: Application Foot Print

    Do NOT route traces under the crescent shape area in the picture above to ensure that the RF index is not affected. 7.2 Application Foot Print Figure 7-2 Recommended footprint of N58 application PCB (Unit: mm) 7.3 Stencil The recommended stencil thickness is at least 0.15 mm to 0.20 mm.

  • Page 68: Solder Paste

    Ramp up rate: 1 to 4 °C/sec ⚫ Ramp down rate: -3 to -1 °C/sec Soaking zone: 150-180 °C, Time: 60-100 s ⚫ Reflow zone: >220 °C, Time: 40-90 s ⚫ Peak temperature: 235-245 °C ⚫ Copyright © Neoway Technology Co., Ltd. All rights reserved.
  • Page 69 Neoway will not provide a warranty for heat-responsive element abnormalities caused by improper temperature control. For information about cautions in N58 storage and mounting, refer to Neoway Module Reflow Manufacturing Recommendations. When manually desoldering the module, use heat guns with great opening, adjust the temperature to 245 °C (depending on the type of the solder paste), and heat the module till the solder paste is melt.

  • Page 70: Safety Recommendations

    ⚫ with other electronic equipment. Please follow the requirements below in application design: Do not disassemble the module without permission from Neoway. Otherwise, we are entitled to ⚫ refuse to provide further warranty. Please design your application correctly by referring to the HW design guide document and our ⚫...

  • Page 71: Conformity And Compliance

    Follow the regulations of the countries when storing, applying, and discarding it. REACH This product complies with the halide-free requirements for PCB regulated in the EN61249-2-21 standard and JCPA-ES-01 2003. Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 72: Bom

    N58 Hardware User Guide B BOM Copyright © Neoway Technology Co., Ltd. All rights reserved.

  • Page 73: Abbreviation

    Clear to Send Direct Current Digital Cellular System Digital Input Digital Input/Output Downlink Digital Output DPSK Differential Phase Shift Keying DQPSK Differential Quadrature Phase Shift Keying Discontinuous Reception Data Terminal Ready Copyright © Neoway Technology Co., Ltd. All rights reserved.
  • Page 74 Liquid Crystal Display Light Emitting Diode Land Grid Array Long Term Evolution Microcontroller Unit MIPI Mobile Industry Processor Interface Printed Circuit Board Personal Communications Service Pulse Width Modulation QVGA Quarter Video Graphics Array Copyright © Neoway Technology Co., Ltd. All rights reserved.
  • Page 75 Time Division Duplex UART Universal asynchronous receiver-transmitter Uplink Universal Serial Bus USIM Universal Subscriber Identity Module VBAT Battery Voltage VSWR Voltage Standing Wave Ratio Wi-Fi Wireless Fidelity WLAN Wireless Local Area Networks Copyright © Neoway Technology Co., Ltd. All rights reserved.

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