ST STEVAL-ILL015V1 RGB LED调光解决方案
ST公司的STEVAL-ILL015V1是采用STP24DP05和STM32™MCU的LED调光演示板,两个STP24DP05可连接16个RGBLED,采用ST1S010的高效开关DC/DC电源,DC电源电压从7.5V到18V,输入电流小于0.7A,LED电流调整.本文介绍了STP24DP05主要特性，典型应用电路图以及STEVAL-ILL015V1LED调光演示板主要特性，电路图和材料清单．
本文引用地址：http://www.eepw.com.cn/article/200435.htmSTEVAL-ILL015V1-LEDdimmerdemonstrationboardbasedontheSTP24DP05andSTM32™STP24DP05:24-bitconstantcurrentLEDsinkdriverwithoutputerrordetection
TheSTP24DP05isamonolithic,lowvoltage,lowcurrentpower24-bitshiftregisterdesignedforLEDpanELdisplays.Thedevicecontainsa8x3-bitserial-in,parallel-outshiftregisterthatfeedsa8x3-bitD-typestorageregister.Intheoutputstage,twenty-fourregulatedcurrentsourcesweredesignedtoprovide5-80mAconstantcurrenttodrivetheLEDs.
The8x3shiftregistersdataflowsequenceordercanbemanagedwithtwodedicatedpins.TheSTP24DP05hasadedicatedpintoactivatetheoutputswithasequentialdelay,thatwillpreventinrushcurrentduringoutputsturn-ON.
Thedevicedetectioncircuitchecks3differentconditionsthatcanoccurontheoutputline:shorttoGND,shorttoVOoropenline.
Thedatadetectionresultsareloadedintheshiftregistersandshiftedoutviatheseriallineoutput.Thedetectionfunctionalityisactivatedwithadedicatedpinorasalternative,throughalogicsequencethatallowstheusertoenterorexitfromdetectionmode.
Throughthreeexternalresistors,userscanadjusttheoutputcurrentforeach8-channelgroup,controllinginthiswaythelightintensityofLEDs.
TheSTP24DP05guaranteesa20Voutputdrivingcapability,allowinguserstoconnectmoreLEDsinseries.
Thehighclockfrequency,25MHz,makesthedevicesuitableforhighdataratetransmission.The3.3Vofvoltagesupplyisusefulforapplicationsthatinterfaceanymicrofrom3.3V.
STP24DP05主要特性:
■Lowvoltagepowersupplydownto3V
■8x3constantcurrentoutputchannels
■Adjustableoutputcurrentthroughexternalresistors
■Shortandopenoutputerrordetection
■SerialdataIN/paralleldataOUT
■Shiftregisterdataflowregisterscontrol
■Accepts3.3Vand5Vmicrodriver
■Outputcurrent:5-80mA
■25MHzclockfrequency
■Highthermalefficiencypackage
图1.STP24DP05方框图
图2.STP24DP05典型应用电路图
采用STP24DP05LED驱动器和STM32MCU的STEVAL-ILL015V1LED调光演示板
ThisusermanualprovidesinstructionsforusingtheSTEVAL-ILL015V1LEDdimmerdemonstrationboardbasedontheSTP24DP05LEDdriverandtheSTM32™microcontrolleracceleratedbySPIandDMA.Thisdocumentprovidesinformationincludinghardwaresetup,descriptionofdemonstrationfirmwarefunctionality,PCinterconnectionoptionsandevaluationoftheSTP24DP05LEDdriver.
STEVAL-ILL015V1LED调光演示板主要特性:
●TwoSTP24DP05(TQFP48)forconnectionof16RGBLEDs
●16RGBhigh-brightnessLEDs
●STM32microcontrollerusinginternalHSoscillator
●High-efficiencyswitchingDC-DCpowersupplyusingtheST1S010
●DCpowersupply7.5-18V(undifferentiatedpolarity,overvoltageprotection)
●DCinputcurrent0.7Amax.,standardsupplyconnector
●LEDcurrentregulation
●Controlledby3buttons,aknobandareset/backbutton
●Availabletestpointforeachimportantsignal
●JTAGinterfaceformicrocontrollerfirmwarechange/update
●ErrorandovertemperatureLEDsforeachLEDdriver.
●3jumpersallowingdisconnectionof3LEDsfromthedriverfortestingtheerror
detectionmode
●3jumpersallowingshortingof3LEDsfromthedriverfortestingtheerrordetection
Mode
●MiniUSBconnectorforPCinterconnection
Theboardisdistributedwithfirmwarewhichenablesstandaloneandnonstandalone
demonstration.Featuresinclude:
●LEDdiagnostic
●AdjustablebrightnessandcolorofeachindividualLED
●Animatedtext
●GUI(graphicaluserinterface)softwareforLEDdiagnostics
图3.STEVAL-ILL015V1LED调光演示板外形图
图4.STEVAL-ILL015V1LED调光演示板电路图:MCU,连接器,按钮和USB
图5.STEVAL-ILL015V1LED调光演示板电路图:驱动器,HBLED
材料清单:
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