Neoway WM620-A, WM620-B User Manual

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WM620 Hardware User Guide V1.1

Neo_WM620

Hardware User Guide

Version V1.0

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WM620 Hardware User Guide V1.1

is a trade mark of Shenzhen Neoway Technology Co., Ltd.

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WM620 Hardware User Guide V1.1

Revision History

Document Version

Content Revised

Date

V1.0

First issue

201309

V1.1 Add UART description 201310

WM620 Hardware User Guide V1.1

Contents

1 Features and Description....................................................................................................................................2

1.1 HW block diagram and block description......................................................................................................2

1.2 Key Features...................................................................................................................................................2

1.3 Pin assignment and description......................................................................................................................0

2 Applicable interface.............................................................................................................................................3

2.1 Power supply Interface...................................................................................................................................3

2.1.1 Power Supply Requirements................................................................................................................... 3

2.1.2 VRTC Interface....................................................................................................................................... 5

2.1.3 Power Supply Output.............................................................................................................................. 6

2.1.4 Power on Sequences................................................................................................................................6

2.2 Power ON/OFF and Reset..............................................................................................................................6

2.2.1 ON_OFF.................................................................................................................................................. 6

2.2.2 RESET_N................................................................................................................................................ 7

2.3 Module Status Output.....................................................................................................................................7

2.3.1 LED Indicator..........................................................................................................................................7

2.3.2 Ring......................................................................................................................................................... 8

2.4 SIM Card........................................................................................................................................................ 9

2.5 USB Interface............................................................................................................................................... 10

2.6 UART............................................................................................................................................................11

2.6.1 Basic Descriptions of UART.................................................................................................................11

2.6.2 Level Translators for UART..................................................................................................................11

2.7 Audio interface............................................................................................................................................. 13

3 Mechanics, Mounting and Packaging..............................................................................................................14

3.1 Dimension and PCB layout..........................................................................................................................14

3.2 Assembly...................................................................................................................................................... 14

3.3 Packaging and solder....................................................................................................................................15

4 Typical Application SCH..................................................................................................................................16

5 Abbreviations.....................................................................................................................................................17

WM620 Hardware User Guide V1.1

1 Features and Description

WM620 is a WCDMA module supporting multiple modes of HSDPA/UMTS/EDGE/GPRS/GSM. The HSDPA

supports 3.6Mbps downlink data rate and 384Kbps uplink data rate. WM620 provides high-quality data and

voice communication, SMS and other functions, widely applied to various industrial and commercial areas.

EVDO and TD-SCDMA modules in the same package are pin to pin compatible to WM620, are provided by

Neoway for customers to meet more 3G applications easily.

WM620 is SMT module in LCC compact package. It can be easily adapted to standard Mini PCI-E Interface.

1.1 HW block diagram and block description

Baseband

Controller

Application Interface

Section

RAM & FLASH

Audio

Section

SIM

UART

USB

WLAN

PCM

1.2

Key

Features

Specification Description

Frequency Band

WM620-A:

UMTS2100/900MHz GSM850/900/1800/1900 MHz

WM620-B:

UMTS1900/850 MHz GSM850/900/1800/1900 MHz

Sensitivity -106dBm

Max. transmitter power

GSM/GPRS 850M/900MHz：+33dBm (Power Class 4)

GSM/GPRS 1800MHz/1900MHz：+30dBm (Power Class 1)

EDGE 850M/900MHz： +27dBm (Power Class E2)

EDGE1800MHz/1900MHz:+26dBm (Power Class E2)

WCDMA/HSDPA：+23dBm (Power Class 3)

WM620 Hardware User Guide V1.1

Transient Current Max 2A

Standby Current (Idle) <5.0mA

Operating Temperature Range Normal working temperature: –20°C to + 70°C

Storage Temperature Range –40°C to + 85°C

Dimension (mm) 30*30*2.7

Power supply

DC power input range 3.3 Volts to 4.2 Volts（recommended 3.9V ）

AT Command

GSM07.07

Neoway extended AT command

Driver

Supporting Windows XP、Linux(2.6.1)、Android

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

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)

HSDPA and equalizer; 3.6Mbps

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

GPRS/EDGE Multislot Class 12, Release 4

DTM Multislot Class 11

Data Rate

GSM CS: UL 14.4kbps / DL 14.4kbps

GPRS:UL 85.6kbps / DL 85.6kbps

EDGE: DL 236.8kbps / UL: 236.8kbps

WCDMA CS: UL 64kbps / DL 64kbps

WCDMA PS: UL 384kbps / DL 384kbps

HSDPA: DL 3.6Mbps / UL 384kbps

Circuit Switched Data

Support CSD

Support USSD

Supplementary Service

Call Transfer (CFB, CFNA, CFU)

Call Waiting

Three-Way Calling

WM620 Hardware User Guide V1.1

1.3 Pin assignment and description

NO.

Pin Name I/O

Pad

group

Description COMMENT

GND

1、12、

17、21、

24、34、

43、45、

50、61

GND PWR Ground

2 NC Reserved

3 NC Reserved

4 NC Reserved

5 NC Reserved

6 NC Reserved

7 NC Reserved

8 NC Reserved

9 NC Reserved

10 NC Reserved

11 NC Reserved

SIM card

interface

13 V_SIM PWR 1.8V/2.8V USIM VCC

14 SIM_RST O 1.8V/2.8V USIM reset

SIM_DAT

I/O 1.8V/2.8V USIM data

Needs an external 10K

pull-up resistance to

V_SIM

16 SIM _CLK I/O 1.8V/2.8V USIM clock

USB

transceiver

interface

18 USB_D+ I/O

High-speed USB

differential data (+)

19 USB_D- I/O

High-speed USB

differential data (-)

20 V_USB PWR USB Power input

Input range from 3.3 to

5.25 V.

Needs a 4.7uF decoupling

MLCC Cap to GND

Power

VBAT PWR

Main battery power

input

Reset 25 RESET_N DI VDD_1.8V Reset input

WM620 Hardware User Guide V1.1

Power

26 VDD_1.8V PWR

Linear regulator

1.8V output

27 VDD_2.6V PWR

Linear regulator

2.6V output

Audio

interface

28 EAR_1P AO

Earphone amplifier

output（+）

29 EAR_1N AO

Earphone amplifier

output（-）

30 MIC_1N AI

Microphone

difference input1 (-)

31 MIC_1P AI

Microphone

difference input (+)

32 NC

Reserved

33 NC

35 NC

36 NC

37 NC

38 NC

39 NC

40 NC

41 NC

42 NC

ANT 44 ANT_M AI/A

RF main antenna

interface

46 ON_OFF I

Control power-on

and power-off

Pulled up internally

with a 250k to

DVDD;

approximately+2.8 V

Indicator

Light

47 VRTC PWR

Coin cell backup

voltage input

Range

1.5~3.25VDC,Typical

3.0VDC

48 SIG_LED O VDD_2.6V

Signal show

LIGHT

ADC 49 ADC AI 12bit ADC input

Input Range：0~2.2V

51 RING O VDD_2.6V Call and SMS

WM620 Hardware User Guide V1.1

indicating Output

52 CTS I VDD_2.6V

High-speed UART clear to send signal

53 RTS O VDD_2.6V

High-speed UART ready for receive signal

54 RXD I VDD_2.6V

High-speed UART receive data input

(allow input 3V)

55 TXD O VDD_2.6V

High-speed UART transmit data output

56 NC Reserved

57 NC Reserved

58 NC Reserved

59 NC Reserved

60 SLEEP_IN DI VDD_1.8V

Sleep control pin

input

62 NC NC Reserved

WM620 Hardware User Guide V1.1

2 Applicable interface

2.1 Power supply Interface

The Power supply part of the WM620 module contains:

PIN Signal name I/O Function description Note

22、23

VBAT PWR For power voltage input

47 VRTC PWR Coin cell backup voltage input

26 VDD_1.8V PWR Linear regulator 1.8V output

27 VDD_2.6V PWR Linear regulator 2.6V output

Characteristics of the VBAT are shown in the table 2-1.

Table 2-1, Input voltage characteristics

Status Min. voltage Typical voltage Max. voltage

VBAT +3.3 VDC +3.9 VDC +4.2VDC

NOTE：Make sure that the VBAT can never exceed 4.5VDC. Voltage higher than 4.5VDC may damage the

WM620 module.

2.1.1 Power Supply Requirements

VBAT is the main power input ranged from 3.3V to 4.2V DC, 3.9V DC is recommended. The average current

is less than 500mA@3.9VDC. But in the module’s transmitting mode, the largest current can burst up to 1.8A

providing the RF power amplifier. The burst current may cause deep voltage drop, and trigger the module into

a power reset. Thus a high value and low ESR capacitor must be installed on the VBAT, to avoid or reduce the

voltage drop caused by the RF power amplifier.

Figure 2-1a, current and voltage curve of VBAT

WM620 Hardware User Guide V1.1

Figure 2-1b, Schematic circuit for current test

The current test results related to the ESR of the capacitors and the internal resistance of the power source. A

470uF tantalum electrolytic capacitor or a 1000uF low ESR aluminum electrolytic capacitor is recommended

for C1. Lithium battery is a very low resistance power source. If the VBAT is supplied by a lithium battery,

220uF or 100uF tantalum capacitor can fit the current require for VBAT. These 10uF, 0.1uF, 100pF and 33pF

MLCC capacitors should be placed close to the VBAT pin.

ESD, Lightning Surge or other interferences can

rarely

cause the WM620 to stop running. Reset the power

supply can recover the module. So the power control is very important in the unattended applications. VCC_EN

in figure 2-2 is the switch to control the power.

The recommended design of power supply is shown in figure 2-2a. In this circuit, with the EN pin of

LDO/DC-DC, power supply can be controlled by the external MCU or other master device. If the LDO or

DC-DC has no EN pin, a low on-resistance P-MOSFET can work as a power switch. The P-MOSFET power

switch shown in Figure 2-2b can replace the function of EN pin.

Figure 2-2a

WM620 Hardware User Guide V1.1

Figure 2-2b

2.1.2 VRTC Interface

VRTC Pin is used as an analog input from the 3 V coin cell for SMPL(Sudden Momentary Power Loss),

RTC(Real-time Clock), and crystal oscillator to keep alive power when the module is powered off. A capacitor

(rather than a coin cell) can be used if only SMPL is supported (not RTC or XTAL).

Figure 2-3

VRTC pin is also used as an analog output to charge a coin cell or a capacitor. When supply current is sourced

from the main power supply through VBAT pin. The on-chip coin cell charger is implemented using a voltage

regulator and series resistor.

If the monitored VBAT drops out-of-range (< 2.55V nominal), the SMPL feature initiates a power-on sequence

without software intervention, and then VBAT returns in-range within a programmable interval of between 0.5

and 2.0 seconds. SMPL achieves immediately and automatically recovery from momentary power loss. A valid

voltage on VRTC is required to run the SMPL timer.

If a capacitor is used instead of a coin cell, it must be connected between VRTC PIN and the ground, Figure

2-3 shows the reference RTC circuit. The capacitor must be charged to operate properly as the SMPL power

source. The capacitor value depends on the SMPL timer setting. Table 2-2 shows the capacitor value of VS

SMPL time.

WM620 Hardware User Guide V1.1

Table 2-2 Keep-alive capacitor values vs. SMPL timer settings

SMPL timer setting Capacitor value Capacitor package (X7R)

0.5 sec 1.5 µF 0805

1.0 sec 3.3 µF 0805

1.5 sec 4.7 µF 0805

2.0 sec 6.8 µF 1206

2.1.3 Power Supply Output

The VDD_1.8V and VDD_2.6V pins are two linear regulator outputs. These two pins can supply the same

output current of 20mA (typical value). These two power supplies can be used for logic level conversion

circuits between WM620 and external devices, and not recommended as a general-purpose power source for

other application circuits.

VDD_2.6V circuit keeps operating while the WM620 module in sleep mode.

2.1.4 Power on Sequences

Figure 2-4 shows the power on sequencing of WM620.

Figure 2-4

2.2 Power ON/OFF and Reset

2.2.1 ON_OFF

ON_OFF is an input pin with an internal pull-up resistance. Launch a valid low level pulse to ON_OFF can

control the WM620’s system into Start-up or shut-down mode. The pulse width requirement and power on

sequence are shown in figure 2-4.

When the WM620 power on, the VDD_2.6V pin would rise up and keep on 2.6V DC, and then the module's

serial port will automatically issue a keyword string, means that the module system is running and AT

commands is ready.

WM620 Hardware User Guide V1.1

While the WM620 is in running mode, low level pulse can put the module system into shutdown procedure.

And then the module would power off within after 5S.

Instead of ON_OFF pin, An AT command can also shutdown the module. For more specific, please refer to the

WM620’s AT command manual.

Keeps the ON_OFF low or connecting to GND, WM620 can automatically power up when VBAT is supplied.

High level pulse control circuit of ON_OFF is shown in Figure 2-5：

Figure 2-5

2.2.2 RESET_N

RESET_N is an active low signal with an internal pull-up resistance and acts as hardware reset input.

Low level pulse longer than 20mS can reset the WM620. After reset the module, power on operations, such as

launch a low level pulse to the ON_OFF pin, must be done again. The recommended reset pulse is 50ms, but

can not exceed 2S. Otherwise, the WM620 module will power off.

If keeps the ON_OFF low or connecting to GND, the WM620 can automatically power up after reset the

module.

2.3 Module Status Output

2.3.1 LED Indicator

PIN Signal Name I/O Function Description DC Characteristics (V)

48 SIG_LED O running status indication Min typical max

-0.3 2.6 2.9

SIG_LED is the WM620’s working status output. The SIG_LED pin can supply 8mA drive current. WM620

provide several flash mode to indicate different running status. For more specific, please refer to the WM620’s

AT command manual.

SIG_LED can drive the LED directly, shown in Figure 2-6a. Figure 2-6b is the reference circuit to increase the

brightness of LED. The LED’s brightness depends on the value of R1 and VCC.

WM620 Hardware User Guide V1.1

Figure 2-6a Figure 2-6b

2.3.2 Ring

PIN Signal Name I/O Function Description DC Characteristics (V)

51 RING O Ring output

Min typical max

-0.3 2.6 2.9

When a phone call is coming, the RING pin will issue several low level pulses. Shows in Figure 2-7.

Figure 2-7

When WM620 receives a SMS, the RING pin will issue one low level pulse, Shown in Figure 2-8. The pulse

width can be configured through an AT command. For more specific, please refer to the WM620’s AT

command manual.

Figure 2-8

WM620 Hardware User Guide V1.1

2.4 SIM Card

PIN Signal name I/O Function description Note

13 V_SIM PWR SIM ard power output 1.8/3.0V

14 SIM_CLK DO SIM card clock output 1.8/3.0V

15 SIM_RST DO SIM card reset output 1.8/3.0V

16 SIM_DATA I/O SIM card data input/output 1.8/3.0V

WM620 module supports 3V & 1.8V SIM cards. The SIM_DATA pin needs an externally 10K pull-up

resistor connected to V_SIM.The SIM_CLK is the clock signal, normally 3.25MHz. Bifurcation is not

recommended at the PCB trace of SIM_CLK.

Include SIM_DATA and SIM_CLK, the traces should be as short as possible and surrounded by the ground

copper to reduce the RF interference. The total distributed capacitance, include the junction capacitance of the

ESD diode or other device, can’t be higher than 120pF.

Figure 2-9a, SIM card and ESD devices

Figure 2-9b, the recommended ESD diode array

Figure 2-9c, a sample of SIM card socket

PIN1, VCC PIN2, RST PIN3, CLK PIN4, GND PIN5, VPP PIN6, DATA

The SIM card application circuit is shown in Figure 2-9. In automotive electronics or other applications with

strong ESD, ESD diodes or ESD varistors are strongly recommended, such as T1 to T4. T1 to T4 should be place closed to SIM card. In some clear applications, SIM card is installed in closed box without human touch, 22~33pF MLCC capacitors can replace the ESD diodes for cost down.

WM620 Hardware User Guide V1.1

Note：SIM card is very sensitive to RF interference.

Serious RF interference to SIM card will cause the WM620 to miss the detection to SIM card and out of service.

So, it is very importance in the PCB design listed as the following message.



The antenna should be installed a long distance away from the SIM card and SIM card traces.



The SIM card traces should be routed as short as possible and shielded with GND copper.



The ESD diodes or capacitors should be placed closed to SIM card.

2.5 USB Interface

Table 2-3, USB Interface

Pin Pin Name I/O Function description Note

18 USB D+ I/O High-speed USB differential data, (+)

19 USB D- I/O High-speed USB differential data, (-)

20 V_USB PWR USB Power Input voltage 3.3 to 5.5V.

The WM620 module is compliant with USB2.0 full speed device. The USB2.0 specification requires the hosts

such as PCs to support three USB speeds, namely low-speed (1.5Mbps), full-speed (12Mbps) and high-speed

(480Mbps).

The V_USB pin is an analog input. A 4.7µF decoupling MLCC capacitor to GND is strongly recommended,

and should be placed as closely as possible to V_USB Pin. It will increase the USB stability. ESD diodes

should be installed to these three signals. Shown in Figure 2-10.

Figure 2-10

Note: The layout design of this USB should comply with the USB 2.0.

 The traces of USB_D+ and USB_D- must be routed as a group of differential pair with 90Ω differential

impedance.



The USB differential pair should be routed side-by-side and on the same layer.

 USB_D+ and D- is a pair of high speed signals, so the trace lengths should match as well as possible.

WM620 Hardware User Guide V1.1

2.6 UART

Pin Pin Name I/O Function description Note

52 CTS I

High-speed UART clear to send signal

53 RTS O

High-speed UART ready for receive signal

54 RXD I

High-speed UART receive data input

(allow input 3V)

55 TXD O

High-speed UART transmit data output

2.6.1 Basic Descriptions of UART

UART1 is for AT commands, data sending/receiving, firmware updating, etc.

As a DCE device, the module is connected to DTE as shown in Figure 2-11.

Supported baud rates are 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400bps, and the default is

115200.

Figure 2-11, Connection between DCE (module) and DTE

The UART of WM620 works at 2.6V CMOS logic level. The voltages for input high level should not exceed

3.0V.

2.6.2 Level Translators for UART

If the UART is interfacing with a MCU that has 3.3V logic levels, resistors should be connected in series with the signals, shown in figure 2-12.

WM620 Hardware User Guide V1.1

Figure 2-12, Interfacing with 3.3V logic levels of MCU

If the UART is interfacing with a MCU that has 5V logic levels, general level translators are required, for both inputs and outputs. As shown in Figure 2-13.

Figure 2-13, Interfacing with 5V logic levels of MCU

Reference components:

R2: 2K-10K. The higher rate the UART works at, the smaller value used

R3: 4.7K-10K. The higher rate the UART works at, the smaller value used

Q1: MMBT3904 or MMBT2222. High-speed transistors preferred.

Used for 5V logic -> 2.6V logic: While this circuit used between MCU TXD and module RXD, the INPUT signal is connected to MCU TXD, and OUTPUT connected to module RXD. VCC_IN powered from 5V and VCC_OUT powered from 2.6V (module’s VDD_2.6V). Used for 2.6V logic -> 5V logic: It can be used between module TXD and MCU RXD as well, with INPUT connected to module TXD, and OUTPUT connected to MCU RXD. VCC_IN powered from 2.6V (module’s VDD_2.6V) and VCC_OUT powered from 5V. This applies to RING signal as well.

Note:

Avoid sparks and glitches on UART signals while the module is in a turning on procedure.

Avoid sending any data to UART during the beginning of 2 seconds after the module being turned on.

WM620 Hardware User Guide V1.1

2.7 Audio interface

Table 2-4, Audio interface

PIN Signal Name I/O Function Description Note

28 EAR_1P AO

Earphone amplifier output（+）

32Ω Earpiece;

typical:35mW

29 EAR_1N AO

Earphone amplifier output（-）

30 MIC_1N AI Microphone #1 input (-)

31 MIC_1P AI Microphone #1 input (+)

The WM620’s typical audio interfaces are shown in Figure 2-14. The earpiece output pins are connected

directly to the earpiece, each with its own bypass capacitor. The capacitor value is selected to optimize

performance in each design, but a value of 100pF or less is expected (100pF is used in the example). The

output power for the differential ear output is typically 35mW for a full-scale +3dBm sine wave into a 32Ω

speaker.

Figure 2-14

WM620 Hardware User Guide V1.1

3 Mechanics, Mounting and Packaging

3.1 Dimension and PCB layout

Figure 3-1, WM620 PCB foot print

3.2 Assembly

The WM620 introduces 62 Pin LCC castellation technology, less pin counts and wide pitch, these features are very suitable

for low-cost and simple designs with 2 layer PCB. Benefit from it’s ultra-compact size and high reliability,

WM620 can be easily designed in. Moreover, WM620supports manual soldering, can adapt to mass production

and also low quantity perfectly, and has low technical requirement for manufacturing equipment.

WM620 Hardware User Guide V1.1

3.3 Packaging and solder

In order to prevent the product of from being affected with damp, caused by using the SMT way to perform the

furnace welding, in the process of production and use of the costumer, we employ the way of damp-proof

packing, such as Aluminum Foil Bag, desiccating agent, Humidity Indicator Cards, Suck plastic trays, and

vacuolization. As a result the product is kept dry and its life span will be long.

For more storage and SMT information, please refer to 《 Neoway modules’ recommendation for SMT and

reflow solder》.

WM620 Hardware User Guide V1.1

4 Typical Application SCH

WM620 Hardware User Guide V1.1

5 Abbreviations

ADC Analog-Digital Converter

模数转换

AFC Automatic Frequency Control

自动频率控制

AGC Automatic Gain Control

自动增益控制

AMR Acknowledged multirate (speech coder)

自适应多速率

CSD Circuit Switched Data

电路交换数据

CPU Central Processing Unit

中央处理单元

DAI Digital Audio interface

数字音频接口

DAC Digital-to-Analog Converter

数模转换

DCE Data Communication Equipment

数据通讯设备

DSP Digital Signal Processor

数字信号处理

DTE Data Terminal Equipment

数据终端设备

DTMF Dual Tone Multi-Frequency

双音多频

DTR Data Terminal Ready

数据终端准备好

EFR Enhanced Full Rate

增强型全速率

EGSM Enhanced GSM

增强型 GSM

EMC Electromagnetic Compatibility

电磁兼容

EMI Electro Magnetic Interference

电磁干扰

ESD Electronic Static Discharge

静电放电

ETS European Telecommunication Standard

欧洲通信标准

FDMA Frequency Division Multiple Access

频分多址

FR Full Rate

全速率

GPRS General Packet Radio Service

通用分组无线业务

GSM Global Standard for Mobile Communications

全球移动通讯系统

HR Half Rate

半速率

IC Integrated Circuit

集成电路

IMEI International Mobile Equipment Identity

国际移动设备标识

LCD Liquid Crystal Display

液晶显示器

LED Light Emitting Diode

发光二极管

MS Mobile Station

移动台

PCB Printed Circuit Board

印刷电路板

WM620 Hardware User Guide V1.1

PCS Personal Communication System

个人通讯系统

RAM Random Access Memory

随机访问存储器

RF Radio Frequency

无线频率

ROM Read-only Memory

只读存储器

RMS Root Mean Square

均方根

RTC Real Time Clock

实时时钟

SIM Subscriber Identification Module

用户识别卡

SMS Short Message Service

短消息服务

SRAM Static Random Access Memory

静态随机访问存储器

TA Terminal adapter

终端适配器

TDMA Time Division Multiple Access

时分多址

UART Universal asynchronous receiver-transmitter

通用异步接收/发送器

VSWR Voltage Standing Wave Ratio

电压驻波比

Neoway WM620-A, WM620-B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual