Neoway WM620 Series Hardware User's Manual

WM620 Hardware User Guide

Version 1.7

WM620 Hardware User Guide

i

No part of this document may be reproduced or transmitted in any form or by any means without

prior written consent of Shenzhen Neoway Technology Co., Ltd.

is the trademark of Neoway Technology Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their

respective holders.

Notice

This document is intended for system engineers (SEs), development engineers, and test engineers.

The information in this document is subject to change without notice due to product version update

or other reasons.

Every effort has been made in preparation of this document to ensure accuracy of the contents, but

all statements, information, and recommendations in this document do not constitute a warranty of

any kind, express or implied.

Neoway provides customers complete technical support. If you have any question, please contact

your account manager or email to the following email addresses:

Sales@neoway.com

Support@neoway.com

Website: http://www.neoway.com

WM620 Hardware User Guide

ii

Revision Record

Issue

Changes

Date

V1.0

Initial draft

2013-09

V1.1

Added UART description

2013-10

V1.2

Modified the description of the USB interfaces

2013-12

V1.3

Modified the description of some pins

2014-02

V1.4



Adjusted the structure of this guide



Added sections 3.6 Sleep Mode and 3.8 RF Interface, chapters 4

RF Features, and 5 Electric Features and Reliability

2014-06

V1.5



Added description of LED status



Deleted WM620-B



Added response time in sleep mode

2015-07

V1.6



Added WM620-B and deleted HSDPA



Modified pin definition figure and recommended PCB foot print



Modified the recommended level shifting circuit



Modified operating temperature, voltage, current, and ESD

testing indicator



Added dimensions tolerance



Deleted CSD

2017-04

V1.7



Added HSDPA and modified model



Modified GSM bands

2017-07

WM620 Hardware User Guide

iii

Contents

1 Introduction to WM620 .................................................................................................... 1

1.1 Overview ............................................................................................................................................ 1

1.2 Block Diagram ................................................................................................................................... 1

1.3 Specifications ..................................................................................................................................... 2

2 Pin Description and PCB Foot Print .............................................................................. 4

2.1 Specifications ..................................................................................................................................... 4

2.2 Pin Definition ..................................................................................................................................... 5

2.3 PCB Foot Print ................................................................................................................................... 7

3 Interface Design ................................................................................................................. 8

3.1 Power Supply and Switch Interfaces .................................................................................................. 8

3.1.1 VBAT ........................................................................................................................................ 8

3.1.2 VRTC .......................................................................................................................................11

3.1.3 VDD ........................................................................................................................................ 12

3.1.4 ON_OFF Pin and Power-on Procedure ................................................................................... 12

3.1.5 RESET .................................................................................................................................... 14

3.2 Running Status Indication ................................................................................................................ 15

3.2.1 LED Indicator .......................................................................................................................... 15

3.2.2 RING Pin ................................................................................................................................. 16

3.3 USIM Card Interface ........................................................................................................................ 17

3.4 USB Interfaces ................................................................................................................................. 19

3.5 UART ............................................................................................................................................... 20

3.5.1 Basic Descriptions of UART ................................................................................................... 20

3.5.2 Level Shifting for UART ......................................................................................................... 21

3.6 Sleep Mode ....................................................................................................................................... 22

3.6.1 UART Control ......................................................................................................................... 23

3.6.2 USB Control ............................................................................................................................ 23

3.7 Audio Interface ................................................................................................................................. 25

3.8 ADC .................................................................................................................................................. 27

3.9 RF Interface ...................................................................................................................................... 28

4 RF Features........................................................................................................................ 30

4.1 Work Band ........................................................................................................................................ 30

4.2 Transmitting Power and Receiving Sensitivity ................................................................................. 30

4.2.1 Transmitting Power ................................................................................................................. 30

4.2.2 Receiving Sensitivity............................................................................................................... 30

WM620 Hardware User Guide

iv

5 Electric Features and Reliability ................................................................................... 32

5.1 Electric Feature ................................................................................................................................. 32

5.2 Temperature ...................................................................................................................................... 32

5.3 Current .............................................................................................................................................. 32

5.4 ESD Protection ................................................................................................................................. 33

6 Typical Circuits ................................................................................................................ 34

7 Mounting the Module onto the Application Board .................................................. 36

8 Package .............................................................................................................................. 37

9 Abbreviations ................................................................................................................... 38

WM620 Hardware User Guide

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Table of Figures

Figure 2-1 Bottom view of the WM620 module ..................................................................................... 4

Figure 2-2 PCB foot print recommended for WM620 (unit: mm) .......................................................... 7

Figure 3-1 Current peaks and voltage drops ........................................................................................... 9

Figure 3-2 Power supply design .............................................................................................................. 9

Figure 3-3 Reference design of power supply controlled by MIC29302 .............................................. 10

Figure 3-4 Reference design of power supply controlled by p-MOSFET ............................................. 10

Figure 3-5 RTC reference design ...........................................................................................................11

Figure 3-6 Reference circuit of ON_OFF controlled by high level ....................................................... 13

Figure 3-7 Power-on procedure ............................................................................................................. 13

Figure 3-8 Reset circuit ......................................................................................................................... 14

Figure 3-9 Reference circuit of LED indicator...................................................................................... 16

Figure 3-10 Circuit for brighter LED .................................................................................................... 16

Figure 3-11 RING indicator for incoming call ...................................................................................... 16

Figure 3-12 RING indicator for SMS ................................................................................................... 16

Figure 3-13 Reference design of USIM card interface ......................................................................... 17

Figure 3-14 Recommended ESD diode array........................................................................................ 18

Figure 3-15 Reference of SIM card socket ........................................................................................... 18

Figure 3-16 Reference USB circuit ....................................................................................................... 19

Figure 3-17 Signal connection between DCE and DTE ........................................................................ 20

Figure 3-18 Recommended circuit between 3.3V MCU and UART ..................................................... 21

Figure 3-19 Recommended circuit between 5V MCU and UART ........................................................ 22

Figure 3-20 Sleep mode controlled by UART ....................................................................................... 23

Figure 3-21 Sleep mode controlled by USB (a) .................................................................................... 24

Figure 3-22 Sleep mode controlled by USB (b) .................................................................................... 24

Figure 3-23 Reference design of MIC differential connections ............................................................ 25

Figure 3-24 Reference design of single-end input MIC interface ......................................................... 26

Figure 3-25 Reference design for speaker differential output ............................................................... 26

Figure 3-26 Reference design for speaker single-ended output ............................................................ 26

Figure 3-27 Reference design for antenna interface .............................................................................. 28

Figure 3-28 RF layout reference ........................................................................................................... 28

WM620 Hardware User Guide

vi

Table of Tables

Table 1-1 WM620 specifications ............................................................................................................ 2

Table 2-1 WM620 pin definition............................................................................................................. 5

Table 3-1 Power supply and switch interface ......................................................................................... 8

Table 3-2 Capacity matching power failure duration ............................................................................ 12

Table 3-3 LED indicator ....................................................................................................................... 15

Table 3-4 Network status indication (a) ................................................................................................ 15

Table 3-5 Network status indication (b) ................................................................................................ 15

Table 3-6 SIM Card Interface ............................................................................................................... 17

Table 3-7 USB interface........................................................................................................................ 19

Table 3-8 UART .................................................................................................................................... 20

Table 3-9 Audio interface ...................................................................................................................... 25

Table 3-10 MIC voltage and current ..................................................................................................... 26

Table 3-11 EAR parameter ................................................................................................................... 27

Table 3-12 SPK parameter .................................................................................................................... 27

Table 4-1 Work band ............................................................................................................................. 30

Table 4-2 Transmitting power (unit: dBm) ........................................................................................... 30

Table 4-3 Receiving sensitivity (Unit: dBm) ........................................................................................ 31

Table 5-1 Electric feature of the module ............................................................................................... 32

Table 5-2 Temperature Feature (Unit: ºC) ............................................................................................. 32

Table 5-3 Operating current (Unit: mA) ............................................................................................... 32

Table 5-4 Current in sleep mode ........................................................................................................... 33

Table 5-5 ESD feature of the module .................................................................................................... 33

WM620 Hardware User Guide

1

1 Introduction to WM620

1.1 Overview

WM620 is a WCDMA module that supports multiple network modes including HSDPA, UMTS, EDGE,

GPRS, and GSM. HSDPA supports 3.6Mbps high-speed download .WM620 provides high-quality data

and voice communication, SMS and other functions. It is widely applied to electricity, Internet of Vehicle

(IoV), video monitoring, handset devices, etc.

WM620 is an SMT module in LCC compact package. It can be easily adopted for standard Mini PCI-E

interface. The model of WM620 is shown as follows.

Band

Model

HSDPA

UMTS 2100

UMTS 900

DCS 1800

EGSM 900

WM620F-A

√

WM620-A

√

This user guide details the features, indicators, and testing standards of WM620.

1.2 Block Diagram

WM620 module consists of power supply management, baseband controller, MCP, power amplifier (PA),

19.2 MHz transistor, 32.768 KHz transistor, various application interfaces, etc. All sections coordinate

with each other to provide such communication functions as data and voice services.

Its design block diagram is shown in the following figure.

WM620 Hardware User Guide

2

1.3 Specifications

Table 1-1 WM620 specifications

Specifications

Description

Frequency Band

WM620F-A: UMTS2100/900 MHz GSM900/1800 MHz

WM620-A: HSDPA/UMTS2100/900 MHz GSM900/1800 MHz

Sensitivity

-108 dBm

Max. Transmit Power

GSM/GPRS 900 MHz: +33 dBm (Power Class 4)

GSM/GPRS 1800 MHz: +30 dBm (Power Class 1)

EDGE 900 MHz: +27 dBm (Power Class E2)

EDGE1800 MHz: +26 dBm (Power Class E2)

HSDPA/WCDMA: +23 dBm (Power Class 3)

Transient Current

Max 2 A

Standby Current (Idle)

<5.0 mA

Operating Temperature

–40°C to + 85°C

Dimension

30±0.1 mm x 30±0.1 mm x 2.7±0.1 mm

Operating Voltage

3.3 V to 4.2 V DC (recommended 3.9 V, 25°C)

AT Command

GSM07.07

Neoway extended AT commands (Refer to Neo_WM620 WCDMA Module AT

Command Set)

Driver

Supporting Windows XP, Windows 7, Linux(2.6.1)

Audio

GSM: FR, EFR, HR, AMR Voice Coding, DTMF

WCDMA: AMR, ARM-WB

SMS

TEXT/PDU

Point of Point / Cell Broadcast

Technical Standard

UMTS/WCDMA/GSM/GPRS/EDGE Specification Release 99 (3GPP R99)

UMTS/WCDMA Specification Release 5 (3GPP R5)

GSM/GPRS/EDGE Specification Release 4 (3GPP R4)

GPRS/EDGE Multislot Class 12, Release 4

DTM Multislot Class 11

Data Rate

GSM CS: UL 14.4 Kbit/s / DL 14.4 Kbit/s

GPRS: UL 85.6 Kbit/s / DL 85.6 Kbit/s

EDGE: DL 236.8 Kbit/s / UL: 236.8 Kbit/s

WCDMA CS: UL 64 Kbit/s / DL 64 Kbit/s

WCDMA PS: UL 384 Kbit/s / DL 384 Kbit/s

HSDPA

：

DL 3.6 Mbit/s / UL 384Kbit/s

Circuit Switched Data

Support USSD

WM620 Hardware User Guide

3

Supplementary Service

Call Forwarding (CFB, CFNA, CFU)

Call Waiting

Three-Way Calling

WM620 Hardware User Guide

4

2 Pin Description and PCB Foot Print

2.1 Specifications

Specifications

WM620

Dimensions

30±0.1 mm x 30±0.1 mm x 2.7±0.1 mm (H x W x D)

Weight

5 g

Encapsulation

62-pin LCC

Figure 2-1 Bottom view of the WM620 module

MIC_1P

SPK_N

RESET

V_BUS

USIM _CLK

TXD

RING

ANT_M

SPK_P

MIC_1N

EAR_N

EAR_P

VDD_2.6V

VDD_1.8V

VBAT

USB_D-

USB_D+

USIM _DATA

USIM _RST

USIM_VCC

SLEEP_IN

RXD

RTS

CTS

SIG_LED

ON_OFF

POWER

GND

USB

Audio

UIM UART

Reserved

JTAG

RF_ANT

Empty

VRTC

MIC_2P

MIC_2N

ADC

Others

WM620 Hardware User Guide

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 The figure shows main application pins. Select pins based on product requirements and leave pins

that are not used unconnected.

 For more details about pins, see the pin description.

 JTAG pins have not be open to customers.

2.2 Pin Definition

Table 2-1 WM620 pin definition

Pin No.

Pin Name

I/O

Function

Level

Feature (V)

Remarks

Power Supply and Switch Interfaces

22, 23

VBAT

PWR

Main power supply

3.3 V to 4.2 V

26

VDD_1.8V

PWR

1.8 V power supply

output

Continuous voltage

output after the

module is on

27

VDD_2.6V

PWR

2.6 V power supply

output

47

VRTC

PWR

RTC power supply I/O

1.5 V to 3.25 V DC

Typical value: 3.0 V

46

ON_OFF

I

On/Off control

Internally pulled up

to 1.8 V by 200K

25

RESET

DI

Hardware reset pin

VDD_1.8V

1, 12, 17,

21, 24,

34, 43,

45, 50, 61

GND

PWR

Ground

Audio Interface

28

EAR_P

AO

Earphone amplifier

output (+)

Keep not connected

(NC) if not used

29

EAR_N

AO

Earphone amplifier

output (-)

30

MIC_1N

AI

Microphone #1 input (-)

Keep NC if not used

31

MIC_1P

AI

Microphone #1 input (+)

32

MIC_2P

AI

Microphone #2 input (-)

Keep NC if not used

33

MIC_2N

AI

Microphone #2 input (+)

35

SPK_P

AO

Speaker amplifier output

(+)

Keep NC if not used

36

SPK_N

AO

Speaker amplifier output

(-)

Keep NC if not used

WM620 Hardware User Guide

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UART Interface

52

CTS

I

UART to send data

VDD_2.6V

At most 3 V input

Not support

firmware update

53

RTS

O

UART ready for

receiving data

VDD_2.6V

54

RXD

I

High-speed UART

receive data input

VDD_2.6V

55

TXD

O

High-speed UART

transmit data output

VDD_2.6V

SIM Card

13

USIM_VCC

PWR

USIM card power supply

1.8V/3V

14

USIM_RST

O

USIM card reset

1.8V/3V

15

USIM_DATA

I/O

USIM card data

1.8V/3V

Externally pulled up

to USIM_VCC by

10K

16

USIM _CLK

I/O

USIM card clock

1.8V/3V

USB Interfaces

18

USB_D+

I/O

High-speed USB

differential USB data (+)

Used for firmware

updating

19

USB_D-

I/O

High-speed USB

differential USB data (-)

20

V_BUS

PWR

USB power supply

Voltage range: 3.3 V

to 5.25 V

Antenna

44

ANT_M

AI/AO

RF I/O

LED Indicator

48

SIG_LED

O

Network indicator

VDD_2.6V

SMS and Incoming Call Ring

51

RING

O

Indicating an incoming

call or message

VDD_2.6V

Sleep Mode Controlling

60

SLEEP_IN

DI

Controlling the sleep

mode

VDD_1.8V

ADC

49

ADC

AI

12-bit ADC

input

Voltage range: 0 V

to 2.2 V

Reserved Pins

2-11,

37-42,

56-59, 62

NC

WM620 Hardware User Guide

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2.3 PCB Foot Print

LCC packaging is adopted to package the pins of the WM620 module. Figure 2-2 shows the

recommended PCB foot print.

Figure 2-2 PCB foot print recommended for WM620 (unit: mm)

WM620 Hardware User Guide

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3 Interface Design

3.1 Power Supply and Switch Interfaces

Table 3-1 Power supply and switch interface

Name

I/O

Function

Remarks

22,

23

VBAT

PWR

Main power supply

3.3 V to 4.2 V (3.9 V is recommended)

26

VDD_1.8V

PWR

1.8 V power supply output

27

VDD_2.6V

PWR

2.6 V power supply output

47

VRTC

PWR

RTC power supply input/output

Not used for any other functions

Ensure that the VBAT never exceeds 4.5 V DC. Voltage higher than 4.5 V DC may damage the WM620

module.

3.1.1 VBAT

VBAT is the main power supply of the module. Its input voltage ranges from 3.3 V to 4.2 V and the

preferable value is 3.9 V. The average current is lower than 500 mA. In addition to digital signals and

analog signals, it supplies power for RF power amplifier.

The performance of the VBAT power supply is a critical path to module's performance and stability. The

peak input current at the VBAT pin can be up to 2 A when the signal is weak and the module works at the

maximum transmitting power. The voltage will encounter a drop in such a situation. The module might

restart if the voltage drops lower than 3.3 V. Thus a large capacitor (e.g. 100 μF tantalum capacitor or 470

μF aluminum capacitor) with low ESR must be installed near the VBAT to avoid or reduce the voltage

drop caused by the RF power amplifier. Figure 3-1 shows the burst current and the voltage drops.

WM620 Hardware User Guide

9

Figure 3-1 Current peaks and voltage drops

Figure 3-2 shows a recommended power supply design for the module.

Figure 3-2 Power supply design

The current test results vary with the internal impedance of the ESR capacitors and power supply. In the

above circuit, use TVS diode at D1 to enhance the performance of the module during a burst. A 100 μF

capacitor with low ESR or 470 μF aluminum capacitor is expected at C1 to reduce voltage drops during

bursts. In case of Li-ion cell battery used, a 220 μF tantalum capacitor may be applicable because the

battery has low internal impedance. In addition, add 0.1 μF, 100 pF, and 33 pF filter capacitors to filter

high frequency interference.

A controllable power supply is preferable if the module is used in harsh conditions. The WM620 module

might fail to reset in remote or unattended applications, or in an environment with great electromagnetic

interference (EMI). Users can use the EN pin on the LDO or DC/DC chipset to control the power supply

as shown in Figure 3-3 if 5 V power supply is adopted.

Keep above 3.3 V

3.3 V

0 ms

3.7 ms 7.4 ms 10.7 ms

T

2 A

Voltage

Input

Current

3.9 V

Power Supply WM620

Close to the pins

D1

C1 C2 C3 C4

VBAT

Current testing

point

I_max

C1 I_max

10uF

100uF

470uF

1000uF

2A

1.1A

0.8A

0.6A

WM620 Hardware User Guide

10

MIC29302WU in the following figure is an LDO and it can output 3 A current to ensure the performance

of the module.

Figure 3-3 Reference design of power supply controlled by MIC29302

The alternative way is to use a p-MOSFET to control the module's power supply, as shown in Figure 3-4.

This way is used if the power supply system does not consist of an EN pin. When the MCU detects the

exceptions such as no response from the module or GPRS disconnection, power-off/on can rectify the

module exceptions thoroughly. In Figure 3-4, the module is powered on when VCC_EN is set to high

level.

Figure 3-4 Reference design of power supply controlled by p-MOSFET

VDD_3.9V

VBAT

10K

100K

TVS

5V

33 pF

10 uF

470 uF

VCC_EN

2K

10K

0.1 uF

Q1

Q2

R4

C1

C2

C3

C4

C5

C6

R1

10 uF 0.1 uF

R3

INPUT

OUTPUT

D1

+

R2

In the above circuit, Q2 is added to eliminate the need for a high enough voltage level of the host GPIO.

In case that the GPIO can output a high voltage greater than VDD_3.9V - |V

GS(th)

|, where V

GS(th)

is the

Gate Threshold Voltage, Q2 is not needed.

VCCIN

VCC_EN

VBAT

100uF

TAN

0.1uF

TVS

5V

0.1uF

470uF

TAN

EN

VIN

VOUT

ADJ

MIC29302WU

10K

4.75K

C1 C2

R1

R2

C3

C4

T1

WM620 Hardware User Guide

11

Reference components:

 Q1 can be IRML6401 or Rds(on) p-MOSFET which has higher withstand voltage and drain current.

 Q2: a common NPN transistor, e.g. MMBT3904; or a digital NPN transistor, e.g. DTC123. If digital

transistor is used, delete R1 and R2.

 C4: 100 μF tantalum capacitor rated at 6.3V; or 470 μF aluminum capacitor.

Protection

It is strongly recommended to add a TVS diode (V

RWM

=5 V) to the VBAT power supply. For some stable

power supplies, zener diodes can decrease the power supply overshoot. SMAJ5.0A/C, SMBJ5.0A/C,

MMSZ5231B1T1G from ONSEMI, and PZ3D4V2 from Prisemi are options.

Trace

The primary loop lines for VBAT on PCB must support the safe transmission of 2 A current and ensure

no obvious loop voltage decrease. Therefore, the trace width is required greater than 1.5 mm and the

ground should be as complete as possible.

3.1.2 VRTC

VRTC is the power supply pin of RTC inside the module to ensure that the clock works properly even

though the module encounters exceptional power failure. It can be connected to external battery or

supercapacitor. When VBAT works properly, VRTC outputs 2 mA current to charge the backup battery or

the capacitor. When VBAT is disconnected, the battery or capacitor will supply power for RTC in short

time. If using a capacitor rather than a backup battery, connect the capacitor to the VRTC and then ground

the capacitor. The capacitor must be charged before it supplies power for RTC in an exceptional situation.

Figure 3-5 shows the reference design of the VRTC power supply.

Figure 3-5 RTC reference design

The capacity of the supercapacitor is dependent on the duration of exceptional power failures. Table 3-2

shows the capacity matching the power failure duration.

Backup

Battery

WM620

RTC

Circuit

2K

Capacitor

VRTC

R1

C1

WM620 Hardware User Guide

12

Table 3-2 Capacity matching power failure duration

Power Failure Duration

Capacity

Encapsulation (X7R)

0.5 s

1.5 µF

0805

1.0 s

3.3 µF

0805

1.5 s

4.7 µF

0805

2.0 s

6.8 µF

1206

3.1.3 VDD

VDD_1.8V and VDD_2.6V are two power supply output pins, which can bear 20 mA in normal situation.

It is recommended to use them only for level shifting. The VDD_2.6V pin do not stop output after the

module enters the sleep mode.

3.1.4 ON_OFF Pin and Power-on Procedure

Prior to turning on the module, start the host MCU and complete the UART initialization. Otherwise

conflictions may occur during initialization due to unstable conditions.

ON/OFF is a low level pulse active input, used to turn on or off the module. It is pulled up to 1.8V

internally by a 200KΩ resistor and controlled by external OC. Figure 3-7 shows its pulse width and

power-on procedure.

When the WM620 is powered on, the VDD_2.6V pin will be pulled up and keep 2.6 V DC output. The

UART will send +EIND:8 after the module is powered on properly and send +EUSIM:1 after the USIM

card is identified. Then the module is ready to response AT commands. If the module does not identify the

USIM card, the UART will send +EIND:8+EUSIM:ERROR.

While the module is on, keep the ON_OFF pin low level for 2 seconds. Then the module enters shutdown

procedure and will be off in 5 seconds. Another approach to turn off the module is using AT commands.

For details, see Neo_WM620 WCDMA Module AT Command.

Keep ON_OFF low level or connecting to GND, and WM620 can start automatically when it is powered

on.

Figure 3-6 shows the circuit of ON_OFF controlled by high-level pulse.

WM620 Hardware User Guide

13

Figure 3-6 Reference circuit of ON_OFF controlled by high level

The ON_OFF pin might encounter pulse interference generated by ESD. It is recommended to parallel a

10 nF capacitor connected to the ground to protect the ON_OFF pin.

It is not recommended to connect the ON_OFF pin to ground to start the module because it will affect the

ESD feature of the module.

The ON_OFF pin can control the module startup and shutdown. Do not repeat triggering this pin.

Otherwise, the startup or shutdown might fail. For example, the user plans to start up the module but gives

low level pulse for twice, resulting in shutdown.

The shutdown function of the ON_OFF pin is controlled by the software. If the software is not running

properly, the module cannot shut down properly.

Figure 3-7 shows the power-on procedure of the WM620 module.

Figure 3-7 Power-on procedure

WM620

ON_OFF

2K

10K

VT2

MCU ON_OFF

10 nF

C3

C3 is close to the pin.

VBAT

ON_OFF

RESET_N

0.5s<t<1s

1.6V<V

H

V

L

<0.5V

USB_DP

2.5s<t<5s

Power-on

Procedure

Power-off

Procedure

4s

4.6s

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Neoway WM620 Series Hardware User's Manual

Neoway WM620 Series Hardware User's Manual

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