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调光演示电感器厂家板主要特性，电路图和材料清单．
STEVAL-ILL015V1-LEDdimmerdemonstrationboardbasedontheSTP24DP05andSTM32™STP24DP05:24-bitconstantcurrentLEDsinkdriverwithoutputerrordetection
TheSTP24DP05isamonolithic,lowvoltage,lowcurrentpower24-bitshiftregisterdesignedforLEDpanELdisplays.Thedevicecontainsa8x3-bitserial-in,parallel-outshiftregisterthatfeedsa8x3-bitD-typestorageregister.Intheoutputstage,twenty-fourregulatedcurrentsourcesweredesignedtoprovide5-80mAconstantcurrenttodrivetheLEDs.
The8x3shiftregistersdataflowsequenceordercanbemanagedwithtwodedicatedpins.TheSTP24DP05hasadedicatedpintoactivatetheoutputswithasequentia一体电感ldelay,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)forco扁平型电感nnectionof16RGBLEDs
贴片电感●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.Featuresinc塑封电感器lude:
●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
万用表的安全问题万用表是电子测试中必不可少的测试工具，一切电子产品在使用中都有潜在的危险，因此了解其使用的安全性就十分必要。
下面我们来谈一下万用表的安全问题。
首先，了解一下使用万
[DCDC]各大神，DCDC电源隔离电压如何选取我需要用DSP控制电机，电机额定电压是直流1000V的。 在选取DCDC电源时对隔离电压一词有些疑惑。 我在网上查看了隔离电压的一些解释后是否可以这样理解？隔离电压就是为了将输入和输出隔离开互不干扰，比如说用DSP控制电机转动，DSP部分是弱电，电机是强电，弱电控制强电，所以在选取DCDC电源时只要隔离电压大于强电部分的额定电压就行。
基于TMS320LF2407A支持FAT32文件系统嵌入式软件 引言近几年来，随着闪烁存储技术的进步，由于Flash闪烁存储体系具有容量大和功耗低等优点，被广泛用于数码相机、媒体播放器和PDA等各种数码产品中。当前各种流行的嵌入式操作系统虽然功能完备，但在许多具