技术jmawsspec v11深圳市奥伟斯科技人

Specification

Generalfeatures

1-Channelcapacitivetouchsensorwithdifferentialsensitivitycalibration

Lowpowerconsumption

Open-draindigitaloutput

Internalpoweronreset

Embeddedcommonandnormalnoiseeliminationcircuit

RoHScompliantSOT-26package

Application

Homeappliance

phonehallsensorre cement

Fluidlevelsensing

Switchre cement

Membraneswitchre cement

Humaninterfacefortoys&in ctivegames

Sealedcontrolpanels,keypads

Sea sorforabidet

JMAWS01

Package(SOT-26)

JMAWS01SOT-26 (Drawingsnottoscale)

PINNumber

Name

I/O

Description

Protection

1

VDD

Power

Power(2.5V~5.0V)

GND

2

SYNC

ogInput

/Output

Adjusttheresponsetime

VDD/GND

3

CS

ogInput

Capacitivesensorinput

VDD/GND

4

CR

ogInput

Referencesensorinputfordifferentialsensitivitycalibration

andinitialtouchdetect

VDD/GND

5

GND

Ground

Supplyground

VDD

6

OUT

DigitalOutput

Touchdetectout

VDD/GND

PinDescription(SOT-26)

Absolute umRating

Supplyvoltage 5.5V

umvoltageonanypin

VDD+0.3V

umcurrentonanyPAD

100mA

ContinuouspowerDissipation

200mW

StorageTemperature

-50~150℃

OperatingTemperature

-20~75℃

JunctionTemperature

150℃

Note1:Unlessanyothercommandisnoted,allaboveareoperatedinnormaltemperature.

ESD&Latch-upCharacteristics

ESDcharacteristics

Mode

Polarity

MinimumLevel

Reference

H.B.M

Pos/Neg

3000V

VDD

3000V

VSS

3000V

PtoP

M.M

Pos/Neg

300V

VDD

300V

VSS

300V

PtoP

C.D.M

Pos/Neg

1000V

DIRECT

Latch-upcharacteristics

Mode

Polarity

MinimumLevel

TestStep

ITest

Positive

25mA~100mA

25mA

Negative

-25mA~-100mA

Vsupplyover5.0V

Positive

18V

1V

ElectricalCharacteristics

VDD=3.3V(Unlessotherwisenoted),TA=25℃

Characteristics

Symbol

TestCondition

Min

Typ

Max

Units

Operatingsupplyvoltage

VDD

2.5

3.3

5.0

V

Currentconsumption

IDD

VDD=3.3V

-

230

-

㎂

VDD=5.0V

-

285

-

Outputumsinkcurrent

IOUT

TA=25℃

-

-

4.0

㎃

InternalresetVDDvoltage

VDD_RST

TA=25℃

-

1.9

2.1

V

Senseinputcapacitancerange

[Note2]

CS

-

10

100

㎊

Referenceinputcapacitancerange

CR

-

12

100

Senseinput

range

RS

-

200

1000

Ω

Minimumdetectable

capacitancevariation

ΔCS

CS=10pF

0.2

-

-

㎊

Outputimpedance(opendrain)

Zo

ΔCS>0.2pF

-

12

-

Ω

ΔCS<0.2pF

-

30M

-

umsupplyvoltagerisingtime

TR_VDD

-

-

100

ms

Note2:Thesensitivitycanbe reasedwithlowerCSvalue.

The mendedvalueofCSis10pFwhenusing3TPC(PolyCarbonate)coverand

10㎜x7㎜touchpatternandmiddlesensitivityselection.

JMAWS01Implementation

Currentconsumption

JMAWS01usesinternalbiascircuit,sointernalclockfrequencyandcurrentconsumptionisnotadjusted.ThetypicalcurrentconsumptioncurveofJMAWS01isrepresentedinaccordancewithVDDvoltageasbelow.ThehigherVDDrequiresmorecurrentconsumption.

Internalbiascircuitcanmakethecircuitdesignsimpleandreduceexternalcomponents.

TypicalcurrentconsumptioncurveofJMAWS01

CSandCRimplementation

TheparallelcapacitorCSisaddedtoCSandCRtoCRtoadjustfinesensitivity.ThemajorfactorofthesensitivityisCS.ThesensitivitywouldbereasedwhensmallerCSvalueisused.Inaddition,theclosercapacitanceofCRistothecapacitanceofCS_TOT,thehigherJMAWS01gesitivity.ThetotalCRvaluemustbweenCS_TOTandCS_TOT(CS_TOT=CS_TOT+CT,theCTisaddedtotheCS_TOTwhenusertouchestheTouchPAD.)fortouchoperation(Refertothebelowfigure).ThetotalCScapacitanceiscomposedofCSwhichissetforoptimalsensitivityandparasiticcapacitanceofCSpattern(CPARA).TheparasiticcapacitanceofCSpatternisabout2pFifnormaltouchpatternsizeisused.Butinthecaseofusinglargertouchpattern,

CPARAisbiggerthannormalvalue.

TheRSisserialconnectionresistortoavoidmalfunctionfromexternalsurgeandESD.(Itmightbeoptional.)From200Ωto1kΩismendedforRS.ThesizeandshapeoftouchPADmighthaveinfluenceonthesensitivity.ThesensitivitywillbeoptimalwhenthesizeofPADisapproximayanhalfofthefirstknuckle(it’sabout10㎜ｘ7㎜).TheconnectionlineofCStothetouchPADismendedtoberoutedasshortaspossibletopreventfromabnormaltouchdetectioncausedbyconnectionline.

SensitivityexamplefigureofJMAWS01

OperationexamplefigureofJMAWS01

SYNCimplementation

1st

2nd

SYNC<<

JMAWS01

SYNC<<

JMAWS01ORTSXX

RSYNC

FromtwoJMAWS01totenJMAWS01(orotherTSseriestouchsensor)canworkontheoneapplicationatthesametimethankstoSYNCfunctionwiththispin.TheSYNCpulsepreventsovertwosensingsignalfrominterferingwitheachother.DuringthesensedisenableperiodandSYNCinput eshigh,internalclockissuspended.TheRSYNCispull-downresistorofSYNCpin.ToobigvalueofRSYNCmakestheSYNCpulsefallingdelay,andtoosmallvalueofRSYNCmaksingdelay.ThetypicalvalueofRSYNCis2MΩ.

SYNCimplementationforresponsetimecontrol.

AnotherfunctionofSYNCpinofJMAWS01istheresponsetimecontrolwithoutanyadditional

externalcomponent.TheSYNCimplementationforresponsetimecontrolisinformedasbelowchart.Andslowresponsetimeismendedinnoisyenvironment.

SYNC

Connection

RSYNCConnection

orOpen

ConnectedtoVDD

ConnectedtoGND

Responsetime

Slow

-

Normal

OUTPUTimplementation

VDD

ROUT

OUT>> OUTPUT

TheOUTisanopendrainstructure.Forthisreason,theconnectionofpull-upresistorROUTisrequiredbetweenOUTandVDDoranotherlowervoltagenode.WhenROUTisconnectedtohighervoltagenodethanVDD,theoutputcurrentpassesthroughprotectiondiodetoVDDandabnormaloperationmaybeoccurred.

The umoutputsinkcurrentis4mA,sooverafewkΩmustbeusedasROUT.Normally10kΩisusedasROUT.TheOUTishighinnormalsituation,andthevalueislowwhenatouchisdetectedonCS.

Internalresetoperation

TheJMAWS01hasstableinternalresetcircuitthatoffersresetpulsetodigitalblock.Thesupply

voltageforasystemstartorrestartshouldbeunder0.3∙VDDofnormaloperationVDD.NoexternalcomponentsrequiredforJMAWS01powerreset,thusithelpssimplecircuitdesignandminimizethecostofapplication.

☞CAUTION:TheVDDrisingtimeshouldbelessthen100msforproperpoweronreset.

mendedCircuitDiagram

JMAWS01

ApllicationExample

ThecapacitorandresistormightbeconnectedwithCS(pin3)forgettingastablesensitivity.ThecapacitorvaluewhichisconnectedtoCRpin(CR)shouldbelittlebiggerthanthetotalCScapacitance( ludeparasiticcapacitance)fortouchoperation.

JMAWS01isresetbyinternalresetcircuit.VDDvoltagerisingtimeshouldbeshorterthan100msecforproperoperation.

ThesensitivitycanbeadjustedthetotalCScapacitanceandthedifferencethetotalCScapacitanceandtheCRvalue(Refertochapter6.2).

FromtwoJMAWS01totenJMAWS01(orotherTSseriestouchsensor)canworkontheoneapplicationatthesametimethankstoSYNCfunction.(Refertochapter6.3)

JMAWS01OUTporthasanopendrainstructure.Thepull-upresistorshouldthereforebeneededasabovefigure.

VDDperiodicvoltageripplesover50mVortheripplefrequencywhichislowerthan10kHzitcancausewrongoperation.Topreventaboveproblem,power(VDD,GND)lineoftouchcircuitshouldbeseparatedfromtheothercircuit.EspeciallytheLEDdriverpowerlineordigitalswitchingcircuitpowerlineshouldbecertainlytreatedtobeseparatedfromtouchcircuit.

TheCSpatternshouldberoutedasshortaspossibleandthewidthofthelineshouldbearound0.25mm.

TheCSpatternroutingshouldbeformedbybottommetal(oppositemetaloftouchPAD).

ThecapacitorwhichisbetweenVDDandGNDisanobligation.ItshouldbecedascloseaspossiblefromJMAWS01.

TheemptyspaceofPCBmustbefilledwithGNDpatterntostrengthenGNDpatternandtopreventexternalnoisethatcausesinterferencewiththesensingfrequency.

Example-PowerLineSplitStrategy

Notsplitpowerline(Badpowerlinedesign)

ThenoisethatisgeneratedbyACloadorrelaycanbeloadedatVDDpowerline.

Abiginductancemightbeappearedaseoftheconnectionlinweenmainboardanddisyboardistoolong,moreoverthevoltageripplecouldbegeneratedbyLED(LCD)disydriveratVDD.

Splitpowerline(One5Vregulatorused)– mended

Splitpowerline(Separated5Vregulatorused)–Strongly mended

PACKAGEDESCRIPTION

MechanicalDrawing

NOTE:

Dimensioningandtolerancing