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User's Guide SCPU034 –December 2011 TCA7408EVM,TCA5405EVM This user’s guide describesthe characteristics,setup and use of the TCA7408EVM/TCA5405EVM EvaluationModule (EVM). Thisuser’s guideincludesset-upinstructions,a schematicdiagram,a billof materials,printed-circuitboardlayoutdrawings,softwareinstructions,and operationinstructions.
Contents
1 Introduction
The TCA7408-5405EVM isdesignedtoshow theused ofmultipleTIproductson a singleevaluation board.Itshows how thesingle-wire5-bitoutputexpanderTCA5405 isused togenerateLED blinking functions.The Singlewireinterfaceisimplementedusinga singleGPIO porton theMSP430, and very simplefirmwareembedded inthedevice.The TCA7408 GPIO expanderisused toan inputhandler,that detectsKey pressesand notifiestheMSP430. The EVM alsohas theTPL0401 thatisused forRGB color mixinginconjunctionwiththeTLC59108. 1SCPU034 –December 2011 TCA7408EVM,TCA5405EVM SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated
Introduction www.ti.com
1.1 Features
- Works withMSP430 Launchpad
- Illustratestheuse ofTPL0401DPOT forcolormixing
- TCA7408 used forKey pressdetection
- Shows theuse ofSinglewireselftimedinterfaceinTCA5405
- Colormixingand LED blinkingcontrol
1.2 TPL0401A/B
The TPL0401 isan I2C bus controlled,singlechannel,linear-taperdigitalpotentiometerwith128 wiper positions.TPL0401A/B have an end-to-endresistanceof10k ohms and thelowterminalinternally connectedtoground.
1.3 TCA5405
The TCA5405 isa 5-bitoutputexpandercontrolledusinga singlewireinput.Thisdeviceisidealfor portableapplicationsas ithas a wideVCC rangeof1.65Vto3.6V.The TCA5405 uses a self-timedserial dataprotocolwitha singledatainputdrivenby a masterdevicesynchronizedtoan internalclockofthat device.
1.4 TCA7408
This8-bitI/Oexpanderforthetwo-linebidirectionalbus (I2C) isdesignedtoprovidegeneral-purpose remoteI/OexpansionviatheI2C interface[serialclock(SCL)and serialdata(SDA)].The majorbenefitof thisdeviceisitswideVCC range.Itcan operatefrom1.65-Vto3.6-Von theGPIO-portsideand 1.65-Vto 5.5-Von theSDA/SCL side.ThisallowstheTCA7408 tointerfacewithnext-generationmicroprocessors and microcontrollerson theSDA/SCL side,where supplylevelsaredroppingdown toconservepower. The TCA7408 open-draininterrupt(INT)outputisactivatedwhen any GPIO setas an inputhas a transitiontothestateoppositeofthatintheInputDefaultStateregisterand thecorrespondingbitinthe InterruptMask Registerissetto0.Itisused toindicatetothesystemmasterthatan inputhas changed to a pre-determinedstate.
1.5 TLC59108
The TLC59108 isan I2C bus controlled8-bitLED driverthatisoptimizedforred/green/blue/amber(RGBA) colormixingand backlightapplicationforamusement products.Each LED outputhas itsown 8-bit resolution(256steps)fixed-frequencyindividualPWM controllerthatoperatesat97 kHz,witha dutycycle thatisadjustablefrom0% to99.6%.The individualPWM controllerallowseach LED tobe settoa specific brightnessvalue.An additional8-bitresolutiongroupPWM controllerhas botha fixedfrequencyof190 Hz and an adjustablefrequencybetween 24 Hz toonce every10.73seconds,witha dutycyclethatis adjustablefrom0% to99.6%.The groupPWM controllerdims orblinksallLEDs withthesame value. TLC59108 scalesup thereferencecurrentsetby theexternalresistor(Rext)tosinktheoutputcurrent (Iout)ateach outputport.
1.6 Requirements
InordertooperatethisEVM, thefollowingcomponents must be connectedand properlyconfigured.
1.6.1 LaunchPad
A Texas InstrumentsLaunchPad (MSP-EXP430G2) withthemale headersand an MSP430G2553 microcontrollerinstalledisrequiredtoruntheboard.A LaunchPad can be acquiredhere (https://estore.ti.com/MSP-EXP430G2-MSP430-LaunchPad-Value-Line-Development-kit-P2031.aspx) NOTE: IMPORTANT: The code tocontroltheTCA7408EVM/TCA5405EVM was writtenfroman MSP430G2553 and willnotwork withtheMSP430 chipsthatareincludedwiththe LaunchPad kit.
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www.ti.com Setup
1.6.2 Power Supply (*Optional)
To ensurecorrectfunctionalityoftheLEDs a 5V supplyat300mA isrecommended (refertonotein section2.3.1).Ifnotusinga USB cabletopower theLaunchPad a 3.3Vpower supplyat200mA is required.
2 Setup
Thissectiondescribesthejumpersand connectorson theEVM.
2.1 Connectors and Jumpers
2.1.1 J1 & J2 – LaunchPad Headers
These connectorsmate withthemale headerson theLaunchPad.
2.1.2 J3 – ExternalLED Power
Thisconnectoriswhere theexternal+5V supplyisattachedtopower thetwo RGB LEDs.
2.1.3 J4 – TCA7408 GPIO
Thisisa pinoutofthefourunused GPIO pinsfromtheTCA7408, GPIO4-GPIO7.
2.1.4 J5 – Feedback loop
FortheTPL0401A tofunctionas a voltagereferencecircuitthenegativefeedbackloopmust be shorted, placinga jumperacrossthisheaderwillshorttheinvertinginputtotheoutput.
2.1.5 J6 – LED or Op-amp
Thisheadercontrolswhat theTPL0401B isattachedto.When shortedacrossposition1 and 2 the TPL0401B isconnectedinserieswiththeexternalresistortocontrolthecurrentthroughtheLED driver. When shortedacrossposition2 and 3 theTPL0401B isconnectedtotheinvertinginputoftheop-amp to change thegainofthecircuit.
2.1.6 J7 – Op-amp input
Thisheadercontrolstheinputtothenon-invertingpinoftheLMV321. When shortedacrossposition1 and 2,theTPL0401A ina voltagedividermode isattachedtothenon-invertinginputoftheLVM321. This setupisused totestthevoltagereferencesetup.When shortedacrosspins2 and 3,theSMA connector isattachedtothenon-invertinginput.
2.1.7 J9 – TestPoints
Thisconnectorofferstestpointsfortheserialdatalines,SDA, SCL and theDIN thatdrivestheTCA5405. Table1.DescriptionofConnectors and Jumpers Label Description J1,J2 ConnectorstointerfacewithLaunchPad J3 External5V forLED J4 GPIO4-GPIO7 fromTCA7408 J5 Controljumpertoshortfeedbackloop J6 Jumper tocontrolLED orOp-Amp J7 Jumper tocontrolinputtoOp-Amp J8 SMA/B Footprintforexternalinput J9 TestpointsforDIN,SDA and SCL 3SCPU034 –December 2011 TCA7408EVM,TCA5405EVM SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated
Operation www.ti.com
2.2 Hardware Setup
Therearethreedifferentmodes thattheEVM can be used in,LED mode, Voltagereferencemode, and Variablegainmode. To setupany ofthesethreemodes, beginby connectingtheEVM totheLaunchPad. Note thelocationoftheVCC and GND pinson headersJ1 and J2 on boththeLaunchPad and theEVM to ensurecorrectinstallation. Installa shortingjumperacrosspins1 and 2 ofJ6.Connectan external+5V supplytoJ3 and either connecttheLaunchPad toa computerthroughUSB orconnecta 3.3Vpower supplytoJ6*on the LaunchPad topower itup. NOTE: :Itcan be possibletopower up theLEDs by connectinga wirefromtheVCC pinofJ6 on theLaunchPad tothepositivepinofJ3.A 5V supplymightbe requiredbecause themax voltagedropacrosstheblueLED plusthedropacrosstheTLC59108 islargerthanthe supplyvoltageoftheLaunchPad.
3 Operation
The TCA5405 willcontrolwhen D1-D5 lightup.TPL0401B isconnectedinseriestotheREXT ofthe TLC59108 LED driverthissetupwillcontrolD6 and D7. Each colorissettoa fixedPWM toensure baselinebrightnessissimilar.Colormixingisthenaccomplishedthroughuniquemethods.The desired currentissetby changingtheW-L resistanceoftheTPL0401B and thedesiredLED isswitchedon.This repeatsfortheothercolorsand thenstartsover.The LEDs aremultiplexedatabout1000 Hz. Aftersettingup theEVM as describedinsection2.3.1,LEDs D1-D5 shouldbe blinkingand D6 and D7 will be blue.To increasethespeed atwhichD1-D5 blinkpressSW1 and todecreasethespeed pressSW2. Thereare25 differentcolorsthatcan be createdwithD6-7 startingwithblueand endingwithgreen.To stepthroughthecolorsfrombluetogreenpressS4.To stepthroughthecolorsfromgreentobluepress S3.
4 MSP430 Code
4.1 TCA5405
Withinthesourcecode fortheMSP430 therearetwo differentmethods tohandlesendingdatatothe TCA5405. Thissectionwillexplainhow theTCA5405 functionsand how theMSP430G2xx3 code works. Figure1.Data Flow forTCA5405
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www.ti.com MSP430 Code
4.1.1 TC5405 Overview
As shown inFigure1,a tenbitserialtransferisrequiredtosetthefiveoutputson theTCA5405. The first fourbits,0101 (S0-S3),actas a startflagfortheTCA5405. S0 isa startbitand S1-S3 aretheclocksense bitsfortheTCA5405. The nextfivebits(D4-D0)arethedatabitsassociatedwitheach oftheoutputs.The tenthbitreturnstheseriallineback tohightoreadytheTCA5405 forthenextinput. Inthesourcecode therearetwo methods tohandlethiscommunication.These functionsarelocatedin Single_Wire.c 1. Use a GPIO (generalpurposeinput/output)and a clockdelaytoemulateS0-D0. 2. Use one oftheMSP430 timerstochange theoutputata specifiedbitinterval. 4.1.2 bit_bang_TCA5405_byte(unsignedchar byte) The functionbi_bang_TCA5405_byte(unsignedcharbyte)willemulatetherequiredtenbitsfor communicationwiththeTCA5405. Thisfunctionworksverysimplyby drivinga GPIO pintohighorlow and utilizingthe_delay_cycles()functiontoholdthevalue.Aftereach asserton theGPIO pina _delay_cycles(16)iscalledtowaitroughly2 microsecondsbeforethenextbit.The sectionthathandles thedatabits(D4-D0)onlyuses a _delay_cycles(10)function;thisistoadjustforthetimespenton if statements. 4.1.3 send_TCA5405_byte The functionsend_TCA5405_byte(unsignedcharbyte)alongwith5405_Timer_ISR()implementsthe requiredserialdataby usingone oftheMSP430 timers.When a byteissenttosend_TCA5405_byte(), thefunctionadds thestartflag(S0-S3)tothebeginningand thestopbit(1)totheend (LSB),storesthe new valuetoa globalvariable,and enablesthetimerinterrupts.Aftera setnumber ofclockcyclesdefined by NEXT_BIT_TIME, 5405_Timer_ISR()iscalledand adjuststheoutputoftheP2.0accordingly. NOTE: The startflagS0-S3 ishardcoded intoeach ofthesemethods 5SCPU034 –December 2011 TCA7408EVM,TCA5405EVM SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated
Schematics,Layout,and BillofMaterials www.ti.com
5 Schematics,Layout,and BillofMaterials
5.1 Schematics
Figure2.TCA5405, TCA7408 Schematic
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www.ti.com Schematics,Layout,and BillofMaterials Figure3.TLC59108 Schematic 7SCPU034 –December 2011 TCA7408EVM,TCA5405EVM SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated
Schematics,Layout,and BillofMaterials www.ti.com Figure4.TPL0401 Schematic
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5.2 Layout
Figure5.Routing,Assembly and SilkscreenTop 9SCPU034 –December 2011 TCA7408EVM,TCA5405EVM SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated
Schematics,Layout,and BillofMaterials www.ti.com Figure6.Layer 2 Power Plane
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www.ti.com Schematics,Layout,and BillofMaterials Figure7.Layer 3 Ground Plane 11SCPU034 –December 2011 TCA7408EVM,TCA5405EVM SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated
Schematics,Layout,and BillofMaterials www.ti.com Figure8.Routing and Assembly Bottom
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5.3 BillofMaterials
Table2.TCA7408EVM/TCA5405EVM BillofMaterial Qty RefDes Value Description PartNumber MFG Notes 4 C1-4 0.1µ Capacitor,Ceramic
1 C5 10µ Capacitor,Ceramic
1 C6 Capacitor,Ceramic DNI
1 J8 Connector,SMA ,Straight,PC 901-144-8RFX AMP DNI
5 D1-5 SML-P12PTT86 Diode,LED, GREEN 2.2V SML-P12PTT86 ROHM 20mA
2 D6-7 APF3236SURKZGQ LED SMD TRI Color APF3236SURKZGQBDC Kingbright
2 J3 J5 Header,Male 2-pin,100mil Sullins
2 J6-7 Header,Male 3-pin,100mil Sullins
1 J4 Header,Male 4-pin,100mil Sullins
2 J1-2 PPTC101LFBN-RC Header,Female 10-pin,100mil PPTC101LFBN-RC Sullins
1 J9 Header,Male 2x3-pin,100mil Sullins DNI
2 R15-16 100k Resistor,Chip,1/16W 5%
10 R1-R4 R11 10k Resistor,Chip,1/16W 5%
5 R5-9 200 Resistor,Chip,1/16W 1%
1 R10 250 Resistor,Chip,1/16W,1%
1 R12 {value} Resistor,Chip,1/16W,5% DNI
1 TP2 5001 TestPoint,Black,ThruHole 5001 Keystone
1 TP1 5013 TestPoint,Orange,ThruHole 5013 Keystone
4 S1-4 EVQ221304M Switch,SPST, 20-mA, 15-V EVQ21304M; EVQ21305R; Panasoni PreferEVQ21304M
EVQ21307K c ifunavailableuse 305R or307K
1 U3 LMV321IDBVR IC Low Power SingleOp-amp LMV321IDBVR TI
1 U4 TCA5405RUG IC,Low Voltage5-Bit TCA5405RUG TI
Self-Timed,Single-WireOutput Expander
1 U2 TCA7408ZSZ IC,Low-Voltage8-BitI2C and TCA7408ZSZ TI
1 U1 TLC59108RGY IC,8-BITFm+ I2C-Bus TLC59108RGY TI
1 U5 TPL0401ADCK IC,DigitalPOT, 1Chan, TPL0401ADCK TI
1 U6 TPL0401BDCK IC,DigitalPOT, 1Chan, TPL0401BDCK TI
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