Texas Instruments LP5521 Bedienungsanleitung

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LP5521

MCU

C

OUT

1 µF

C

IN

1 µF

0.47 µF

C

FLY1

C

FLY2

SCL

SDA

CLK_32K

INT

ADDR_SEL0

ADDR_SEL1

TRIG

EN

VDD

GNDs

R

G

B

VOUT

CFLY1PCFLY1NCFLY2PCFLY2N

-

+

RGB LED 0...25.5 mA/LED

GPO

0.47 µF

Copyright © 2016, Texas Instruments Incorporated

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP5521

SNVS441I–JANUARY2007–REVISEDNOVEMBER2016

LP5521Three-ChannelRGB,White-LEDDriverWithInternalProgramMemoryand

IntegratedChargePump

1

1Features

1

•AdaptiveChargePumpWith1×and1.5×Gain

ProvidesUpto95%LEDDriveEfficiency

•ChargePumpwithSoftStartandOvercurrent,

Short-CircuitProtection

•LowInputRippleandEMI

•VerySmallSolutionSize,NoInductororResistors

Required

•200-nATypicalShutdownCurrent

•AutomaticPowerSaveMode

•I

2

C-CompatibleInterface

•IndependentlyProgrammableConstantCurrent

Outputswith8-BitCurrentSettingand8-BitPWM

Control

•TypicalLEDOutputSaturationVoltage50mVand

CurrentMatching1%

•ThreeProgramExecutionEngineswithFlexible

InstructionSet

•AutonomousOperationWithoutExternalControl

•LargeSRAMProgramMemory

•TwoGeneralPurposeDigitalOutputs

2Applications

•FunandIndicatorLights

•LCDSub-DisplayBacklighting

•KeypadRGBBacklightingandPhoneCosmetics

•Vibra,Speakers,WaveformGenerator

•BloodGlucoseMeter

•HandheldPOSTerminals

•ElectronicAccessControl

•WhereRGBIndicationisNeeded

TypicalApplicationCircuit

3Description

TheLP5521isathree-channelLEDdriverdesigned

toproducevarietyoflightingeffectsformobile

devices.Ahigh-efficiencychargepumpenablesLED

drivingoverfullLi-Ionbatteryvoltagerange.The

devicehasaprogrammemoryforcreatingvarietyof

lightingsequences.Whenprogrammemoryhasbeen

loaded,LP5521canoperateautonomouslywithout

processorcontrolallowingpowersavings.

Thedevicemaintainsexcellentefficiencyoverawide

operatingrangebyautomaticallyselectingproper

chargepumpgainbasedonLEDforwardvoltage

requirementsandisabletoautomaticallyenter

power-savemode,whenLEDoutputsarenotactive

andthusloweringcurrentconsumption.

ThreeindependentLEDchannelshaveaccurate

programmablecurrentsourcesandPWMcontrol.

Eachchannelhasprogrammemoryforcreating

desiredlightingsequenceswithPWMcontrol.

TheLP5521hasaflexibledigitalinterface.Trigger

I/Oanda32-kHzclockinputallowsynchronization

betweenmultipledevices.Interruptoutputcanbe

usedtonotifyprocessor,whenLEDsequencehas

ended.TheLP5521hasfourpinselectableI

2

C-

compatibleaddresses.Thisallowsconnectingupto

fourparalleldevicesinoneI

2

C-compatiblebus.GPO

andINTpinscanbeusedasadigitalcontrolpinfor

otherdevices.

TheLP5521requiresonlyfoursmall,low-cost

ceramiccapacitors.

Comprehensiveapplicationtoolsareavailable,

includingcommandcompilerforeasyLEDsequence

programming.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE

LP5521TMDSBGA(20)2.093mm×1.733mm(MAX)

LP5521YQWQFN(24)5.00mm×4.00mm(NOM)

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

Produktspezifikationen