Hangzhou Gubei Electronics Technology 3301SBSL WT1SBSL User Manual

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

BiTrend™ EssentialSeriesWi-Fi Module

User Manual

WT1SBSL

1www.ibroadlink.com

Hangzhou Gubei Electronics Technology Co., Ltd.

The information contained in this document is the proprietary information of Hangzhou Gubei

Electronics Technology Co., Ltd. (hereinafter referred as BroadLink). Further, no portion of this

document may be altered or edited in any form or by any meanswithout the prior written

consent of BroadLink, the copyrightholder.

Further BroadLink reserves the right to make modifications, additions anddeletions to this

document due to typographical errors, inaccurate information, orimprovements to products

mentioned in the document at any time and without notice. Such changes will, nevertheless be

incorporated into new editions of this document or published as errata sheet.

Version History

V 1.0.0 22/01/2016 1stissue of preliminary document

2www.ibroadlink.com

Table of Contents

1. Introduction.................................................................................................................................3

1.1 Overview............................................................................................................................3

1.2 Applications.......................................................................................................................4

1.3 Key Features......................................................................................................................4

2. Product Overview.......................................................................................................................5

2.1 Product Picture.................................................................................................................5

2.2 Block Diagram...................................................................................................................5

3. Electrical Characteristics.............................................................................................................6

3.1 Absolute Maximum Ratings – Voltage & Current........................................................6

3.2Current consumption........................................................................................................6

3.3 Absolute maximum ratings – Temperature...................................................................7

3.4Absolute maximum ratings – ESD...................................................................................7

4. Module Interfaces.......................................................................................................................8

4.1 PIN Layout.........................................................................................................................8

4.2 PIN Definitions..................................................................................................................8

5. Reference Design........................................................................................................................9

6. AntennaCharacteristics............................................................................................................

10

6.1 Antenna Selection..........................................................................................................10

6.2 Minimizing Radio Interference.....................................................................................11

6.3 Specification of On-Board Antenna.............................................................................12

Appendix A Glossary（Quentin respible）...............................................................................13

Appendix B Reference paper（Quentin respible）..................................................................15

Contact Us.....................................................................................................................................16

3www.ibroadlink.com

1. Introduction

1.1 Overview

BiTrend™ Essentialis the industrial leading 2.4Ghz 802.11 b/g/n embedded Wi-Fi module which

delivers unmatched performance and codeless development in a compact package, providing

a quick, easy and cost effective way for developers and manufacturers to add Wi-Fi connectivity

for home automation, lighting control, energy efficiency and other IOT applications.

BiTrend™ Essential family combines a 2.4Ghz 802.11 b/g/n radio transceiver with a 32-bit

microprocessor and embedded with MAC, baseband processing and optimized Wi-Fi network

stack. It is an ideal solution for developers and manufacturers with limited RF and embedded

programming expertise as it significantly reduces RF design time and removes the burden of

testing and certification.

Benefitted from BroadLink’s turn-key solution, BiTrend™ Essential is an ideal solution for

developers with limited Wi-Fi or RF expertise or for those seeking faster time to market. It

reduces RF design time and removes the burden of testing and certification. BiTrend™ Essential

is fully compliant with IEEE 802.11 b/g/n standard and certified with CE, FCC and RoHS.

BiTrend™ Essential is a highly integrated Wi-Fi SoC(system on Chip) single chip, which

supportsIEEE802.11b/g/n single stream, providing GPIO for intelligent control, and UART

interfaces for device communication.

BiTrend™ Essential has 8Mbits flash and integrates power amplifier, low noise amplifier, and RF

switch to reduce the module size and RF design capability required. And also integrate power

manage unit for single 3.3V power source for cost effective design.

BiTrend™ Essential embedded 32-bit RISC MCU for 802.11b/g/n drivers, supplicant, TCP/IP

protocol stack, and networking applications, can be operated in station mode and softAP mode.

The WT1SBSL is an ideal solution for embedded device to enable networking service with

minimized design effort.

4www.ibroadlink.com

receiver

transmitter

Baseband

MAC /

Packet

buffer /

security

engine

UART

System

control

RF_IN

RF_OUTP

RF_OUTN

UART

GPIO/LED

Figure 1. WT1SBSL block diagram

1.2 Applications

 Smart home appliances

 Remote Control

 Medical/Health Care

 Network consumer devices

1.3 Key Features

a． Support IEEE802.11b/g/n

b． Support UARTtransparent transfer

c． Support STA\AP

d． Patent SmartConfig™ technology

e． Support IPv4, TCP/UDP/ DNS/DHCP

f． PCB printed antenna

g． Power source: 3.3V

h． Peripherals:

1*UART

5*GPIO

1*RESET

i． Dimension 31mm*17.7mm*3.6mm

j． ESD: 2KV

k． Absolute maximum ratings

5www.ibroadlink.com

2. Product Overview

2.1 Product Picture

2.2 Block Diagram

MTK7681

802.11 b/g/n

SoC

SPI

FLASH

Balun

Circuit

40MHz

OSC

Reset

Multiplex

Circuit

UART

Filter

Circuit

PCB

Antenna

GPIO

6www.ibroadlink.com

3. Electrical Characteristics

3.1 Absolute Maximum Ratings – Voltage & Current

Using products above the absolute maximum ratings may cause permanent damage to the

device. These are maximum ratings only and functional operation of the device at these

conditions is not implied. Exposure to maximum rating conditions for extended periods may

aect the reliability of the device.

SymbolRatingMINTYPMAXUnit

VDD333.3VSupplyVoltage2.973.33.63V

Symbol

tings Max

Unit

VDD

Tota l currentintoVDDpowerlines(source)

VSS

Tota l currentoutofVSSgroundlines(sink)

OutputcurrentsunkbyanyI/Oandcontrolpin

OutputcurrentsourcebyanyI/Osandcontrolpin

3.2Current consumption

Symbol

Condition

Performance

TYP Unit

IDLE mode 80 mA

RX Active, HT40, MCS7 151 mA

TX HT40, MCS7

@ 15dBm（pulse） 210 mA

TX CCK

11Mbps @ 18dBm（pulse） 250 mA

Note: All result is measured at the antenna port and VDD33 is 3.3V

7www.ibroadlink.com

3.3 Absolute maximum ratings – Temperature

Symbol

Rati Max

Unit

STG

Storagetemperature –40 to+125

℃

Workingtemperature -10 to+70

℃

Humidity

Non condensing, relative humidity 90%

（

）

3.4Absolute maximum ratings – ESD

Symbol Ratings Conditions Class Max Unit

ESD

(HBM)

Electrostatic discharge

voltage

(human body model)

TA = +25 °C

conforming to

JESD22-A114

2 2000 V

8www.ibroadlink.com

4. Module Interfaces

4.1 PIN Layout

WT1SBSL has one group of pins2X7. The layout of PINs are shown in the figure below.

Figure6.

WT1SBSL

pin-out

4.2 PIN Definitions

PIN Assignment

PINPINNAMENOTE

Pin1GND

Pin2VCC3.3V

Pin3RST_NModule software reset,Available

atlowlevel

Pin4UART_TXUARTOnly

forPassthrough

Pin5UART_RX

Pin6GPIO3

Pin7GPIO4Feedwatchdog

Pin8GPIO4Feedwatchdog

Pin9GPIO3

Pin10GPIO2

9www.ibroadlink.com

Pin11GPIO1Module software reset,Available

atHighlevel

Pin12GPIO0UsuallyuseasWi‐FiLED

Pin13VCC3.3V

Pin14GND

5. Reference Design

In addition to the standard serial port，the peripheral MCU also need to provide two GPIO pins

to connect with the GPIO4 pin and the RST pin of the WIFI module respectively,when the WIFI

module works properly,the GPIO4 pin will keep outputting message of dog feeding,if the

peripheral MCU did not receive the message,the module will reset and restart through pulling

down the RST pin by the other GPIO pin.

If the peripheral MCU uses power source of 5V,it needs to add a level switching circuit in the

connection of the serial port and the related circuit.

The module needs a large current about 250mA when transmitting data,please ensure that the

power source can provide sufficient current.

WIFIMODULE

Peri

heral MCU

10www.ibroadlink.com

6. AntennaCharacteristics

6.1 Antenna Selection

The WT1SBSL supports on-board PCB printed antenna.When the Operating Frequencyis

between 2.4G~2.5GHz, S11 of antenna port is less than-10dB and peak gainis about 1. 5dBi.

Figure 7. Antenna radiation pattern simulation

Figure 8. Antenna port S11simulation curve

In practical use, WT1SBSL is welded on user’s boardand value of S11 has some changes.

11www.ibroadlink.com

6.2 Minimizing Radio Interference

When integrating the Wi-Fi module with on board PCB printed antenna, make sure the three

points below:

1. The area under the antenna end of the module should be keep clear of metallic components,

connectors, vias, traces and other materials that can interfere with the radio signal.

2. The area around the antenna end the module protrudes at least 10mm from the mother

board PCB and any metal enclosure.

3. When planning PCB layout, it is recommended that user places the antenna of Wi-Fi module

as close as possible to the edge of boarder to ensure the good performance of antenna, which

is shown in the picture below.

12www.ibroadlink.com

6.3 Specification of On-Board Antenna

OperatingFrequency 2.4G~2.5GHz

VSWR(max) 2

Peak Gain 1.45dBi

AntennaType PIFA

13www.ibroadlink.com

Appendix A Glossary（Quentin respible）

ADCAnalog‐to‐DigitalConverter

AESAdvancedEncryptionStandard

ANTAntenna



APWirelessAccessPoint

BPSKBinaryPhaseShiftKeying

DBPSK



Differential binar

hase shift ke

DC Direct Current

ComplementaryCodeKeying

CDMChargeDeviceModel

DHCP



Dynamic Host Configuration Protocol



CMOSComplementaryMetalOxideSemiconductor

DNS



Determination of non-significance

DQPSK Differential quadrature phase shift keying

DSSS Demand assigned signaling and switching subsystem

DTIM



Digital Transmission Interface Module



EMSP Enhanced Modular Signal Processor

ESD Electrostatic Discharge

EVM Error Vector Magnitude

FCC Federal Communications Commission

FER Floating Error

GND Ground

GPIO General Purpose Input/Output

HBM Human body model

IEEE Institute of Electrical and Electrionics Engineers

IO Input/Output

IOT Individual operation test

IPv4 Internet Protocol version 4

LED Light-emitting diode

LVTTL Low Voltage Transistor Transistor Logic

MAC Medium Access Control layer

MCS Modulation and coding scheme

MCU Microcontroller Unit

MIMO Multiple-Input Multiple-Output

MSL Multilayer Switching Protocol

NC Numerical Control

NRST Negative Reset

DM Orthogonal Frequency Division Multiplexing

OSC Oscillator

PCB Printed Circuit Board

PIFA Planar inverted F antenna

QPSK Quadrature Phase Shift Keyin

RC Resistance- capacitance

RF Radio Frequency

14www.ibroadlink.com

RISC Reduced Instruction Set Computer

RoHS Restriction of Hazardous Substances

RX Receiver

SDIO Serial Digital Input/Output

SoC System on Chip

SPDT Single-Pole Double-Throw

SPI Serial Peripheral Interface

STA Spanning Tree Algorithm

TCP Transfer Control Protocol

TKIP Temporal Key Integrity Protocol

Transmitter

IP Internet Protocol

UART Universal Asynchronous Receiver/Transmitter

UDP User Datagram Protocol

UFL

a miniature coaxial RF connector for high-frequency signals

manufactured by Hirose Electric Group

VSWR Voltage Standing Wave Ratio

WEP Wired Equivalent Privacy

WEPA Welded Electronic Packaging Association

WEP64 64 bit Wired Equivalent Privacy

WEP128 128 bit Wired Equivalent Privacy

WPA2 Wi-Fi Protected Access 2

XTAL External Crystal Oscillator

QAM Quadrature Amplitude Modulation

802.11 b/g/n The IEEE 802.11 b/g/n



15www.ibroadlink.com

Appendix B Reference paper（Quentin respible）

[1] IEEE 802.11b/g/n- published IEEE 802.11-2007wireless networking standard and

published IEEE 802.11-2012 standard for Information technology - Clause 19 of the

publishedIEEE 802.11-2007 standard, and Clause 19 of the published IEEE

802.11-2012 standard.



16www.ibroadlink.com

Hangzhou Gubei Electronics Technology Co., Ltd.

Room 106, Building 1, No. 611 Jianghong Road, Binjiang, Hangzhou, Zhejiang, P.R.China

T: +86-571-85159281 F: +86-571-86631817

E: intl@broadlink.com.cn W: www.ibroadlink.com.cn

ThisdevicecomplieswithPart15oftheFCCRules/IndustryCanadalicence‐exempt

RSSstandard(s).Operationissubjecttothefollowingtwoconditions:(1)thisdevice

maynotcauseharmfulinterference,and(2)thisdevicemustacceptanyinterference

received,includinginterferencethatmaycauseundesiredoperation.



LeprésentappareilestconformeauxCNRd'IndustrieCanadaapplicablesaux

appareilsradioexemptsdelicence.L'exploitationestautoriséeauxdeuxconditions

suivantes:(1)l'appareilnedoitpasproduiredebrouillage,et(2)l'utilisateurde

l'appareildoitacceptertoutbrouillageradioélectriquesubi,mêmesilebrouillageest

susceptibled'encompromettrelefonctionnement.



Changesormodificationsnotexpresslyapprovedbytheparty

responsibleforcompliancecouldvoidtheuser'sauthoritytooperatethe

equipment.



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aredesignedtoprovidereasonableprotectionagainstharmful

interferenceinaresidentialinstallation.Thisequipmentgenerates

usesandcanradiateradiofrequencyenergyand,ifnotinstalledand

usedinaccordancewiththeinstructions,maycauseharmfulinterference

toradiocommunications.However,thereisnoguaranteethatinterference

willnotoccurinaparticularinstallation.Ifthisequipmentdoescause

harmfulinterferencetoradioortelevisionreception,whichcanbe

determinedbyturningtheequipmentoffandon,theuserisencouraged

totrytocorrecttheinterferencebyoneormoreofthefollowing

measures:

17www.ibroadlink.com

—Reorientorrelocatethereceivingantenna.

—Increasetheseparationbetweentheequipmentandreceiver.

—Connecttheequipmentintoanoutletonacircuitdifferentfromthat

towhichthereceiverisconnected.

—Consultthedealeroranexperiencedradio/TVtechnicianforhelp.



MPERequirements

TosatisfyFCC/ICRFexposurerequirements,aseparationdistanceof20cmormoreshouldbe

maintainedbetweentheantennaofthisdeviceandpersonsduringdeviceoperation.

Toensurecompliance,operationsatcloserthanthisdistanceisnotrecommended.



Lesantennesinstalléesdoiventêtresituéesdefaconàcequelapopulationnepuisse

yêtreexposéeàunedistancedemoinde20cm.Installerlesantennesdefaconàce

quelepersonnelnepuisseapprocherà20cmoumoinsdelapositioncentraledel’

antenne.

LaFCCdeséltats‐unisstipulequecetappareildoitêtreentouttempséloignéd’au

moins20cmdespersonnespendantsonfunctionnement.



RegionSelection

Limitedbylocallawregulations,versionforNorthAmericadoesnothaveregionselectionoption.



InformationfortheOEMIntegrators

ThisdeviceisintendedforOEMintegratorsonly.Pleaseseethefullgrantof

equipmentdocumentforrestrictions.



LabelInformationtotheEndUserbytheOEMorIntegrators

IftheFCCIDofthismoduleisnotvisiblewhenitisinstalledinsideanotherdevice,

thentheoutsideofthedeviceintowhichthemoduleisinstalledmustbelabelwith

“ContainsFCCID:2ACDZ‐3301SBSLandIC:21239‐3301SBSL”

Hangzhou Gubei Electronics Technology 3301SBSL WT1SBSL User Manual

Hangzhou Gubei Electronics Technology Co.,Ltd WT1SBSL

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