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
| Marke: | Texas Instruments |
| Kategorie: | Nicht kategorisiert |
| Modell: | LP5521 |
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