Texas Instruments LP3950 Bruksanvisning

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LP3950

V

DD1

V

DD2

V

DDA

C

VDD1

C

VDD2

C

VDDA

100 nF

100 nF

100 nF

2.8V

C

IN

10 PF

4.7 PH

L

1

V

IN

C

OUT

10 PF

D

1

R

R1

R

G1

R

B1

R

R2

R

G2

R

B2

R

T

82k

C

VREF

100 nF

SW

FB

R1

G1

B1

R2

G2

B2

RT

VREF

GNDs

AUDIO SIGNAL

C

1

10 nF

AUDIO SIGNAL

SINGLE-ENDED

DIFFERENTIAL

C

2

10 nF

C

3

10 nF

MICROCONTROLLER

4

SERIAL

INTERFACE

NRST

PWM_LED

V

DD_IO

C

VDD_IO

100 nF

IF_SEL

DMEAMODE

ASE

AD1

AD2

LP3950

www.ti.com

SNVS331C–NOVEMBER2004–REVISEDAPRIL2013

LP3950ColorLEDDriverwithAudioSynchronizer

CheckforSamples:LP3950

1

FEATURES

DESCRIPTION

TheLP3950isacolorLEDdriverwithabuilt-inaudio

2

•AudioSynchronizationforColorLEDswith

synchronizationfeatureforanyanalogaudioinput

TwoModes:AmplitudeandFrequency

suchaspolyphonicringtonesandMP3music.LEDs

•ProgrammableFrequencyandAmplitude

canbesynchronizedtoanaudiosignalwithtwo

ResponsewithTrackingSpeedControl

methods-amplitudeandfrequency.Alsoseveralfine

tuningoptionsareavailablefordifferentiation

•AutomaticGainControlorSelectableGainfor

purposes.ThechipalsohasanuniqueAGC

InputSignalOptimization

(AutomaticGainControl)featurewhichtracksthe

•RGBPatternGeneratorSimilarto

inputsignallevelandautomaticallyadjuststhegain

LP3933/LP3936

toanoptimalvalue.

•MagneticDC-DCBoostConverterwith

TheLP3950hasahighefficiencymagneticDC/DC

ProgrammableBoostOutputVoltage

converterwithprogrammableoutputvoltageand

•SelectableSPIorI

2

CCompatibleInterface

switchingfrequency.Theconverterhashighoutput

currentcapabilitysoitisalsoabletodriveflashLEDs

•OnePinDefaultEnableforNon-SerialInterface

incameraphoneapplications.

Users.OnePinSelectorforSynchronization

Mode

TheLP3950issimilartoLP3933andLP3936inthat

•SpaceEfficient32-PinTLGAPackage

thecolorLEDs(orRGBLEDs)canalsobe

programmedtogeneratelightpatterns

(programmablecolor,intensity,on/offtiming,slope

APPLICATIONS

andblinkingcycle).

•CellularPhones

AllfunctionsaresoftwarecontrollablethroughaSPI

•MP3/CD/MinidiscPlayers

orI

2

Ccompatibleinterfacebutthedevicealso

•Toys

supportsonepincontrolforenablingpredefined

(default)audiosynchronizationmode.

TypicalApplication

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2004–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer