PKE demo Introduction瑞萨汽车无钥匙启动系统方案.pdf

《PKE demo Introduction瑞萨汽车无钥匙启动系统方案.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、PassiveKeylessEntryPassiveKeylessEntry瑞萨电子株式会社汽车电子产品中心应用技术部解决方案科2011/07/13©2010RenesasElectronicsCorporation.Allrightsreserved.00000-AContent¢Background¢PKEBlockDiagram¢HardwareSystemHardwareSystem¢SoftwareSystemSoftwareSystem2©2010RenesasElectronicsCor

2、poration.Allrightsreserved.1.BackgroundDistance：SeveraltensofmetersFrequency：315MHz，433.92MHzModulation：FSK，ASKDistance：About2metersFrequency：19KHz,125KHz,134.2KHzFeature：convenience3©2010RenesasElectronicsCorporation.Allrightsreserved.2、PKEBlockDiagram

3、EncryptionDataUHFTransmitterUHFMCUReceiverMCULFDataLFLFTransmitterReceiver19KHz19KHzBaseKey4©2010RenesasElectronicsCorporation.Allrightsreserved.3、HardwareSystem（1）—Key+3VINTPEEPROMAS3931A/D7880503F0503INTP12VRFEncryptionTimerTransmitter5©2010RenesasEle

4、ctronicsCorporation.Allrightsreserved.3、HardwareSystem（2）—BaseVoltage12VRegulator5VLFCAN78F0881TransceiverCANPWMTransmitterLINTransceiverLINRFINTPreceiverA/DEncryptionPWMEEPROMTouchKey6©2010RenesasElectronicsCorporation.Allrightsreserved.3、HardwareSyste

5、m（3）—LFtransmitter7©2010RenesasElectronicsCorporation.Allrightsreserved.4、SoftwareRealization¢Keyandlogic¢Hoppingcodedatastructure¢encryptiondecryption¢Datatransmitreceive¢Parameter（Synccounter,encryptionkey）conservation¢Lowpowerconsumption8©2010Renes

6、asElectronicsCorporation.Allrightsreserved.4.1Thesecurity（1）¢--HoppingcodeòHoppingcode:ithasadvantageoffixedcode.Fixedcodeisnotsecurityandeasytobecopied.òHoppingcodeincludethefixedpartincludingtheIDcodeandfunctioncode,andthehoppingpartmore.Thehoppingcod

7、eisencryptedbytheencryptionalgorithm,andhdchangedtdateverytransmission。òBillionsofcombination9©2010RenesasElectronicsCorporation.Allrightsreserved.4.1Thesecurity（2）¢--Explanationò16-bitSyncCounter：Changedwheneachkeypressed,andsavedintheEEPROM.ò64-bitEnc

8、ryptionKey：The64-BITdatashouldbesavedintheEEPROMinadvance,andtogeneratethehoppingcode.òIDCode：Todistinguishthetransmitterandthereceiver.òDiscriminationCode：IsthelowerbitoftheIDcode,tochecktheerrorofthetransmission.òFunctionCode：T