USB Type-C 3.1协会规范

Release1.0-28-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-1USBType-CReceptacleInterfaceDimensionsRelease1.0-29-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-1USBType-CReceptacleInterfaceDimensions,cont.Release1.0-30-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-2ReferenceDesignUSBType-CPlugExternalEMCSpringContactZonesRelease1.0-31-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-3USBFull-FeaturedType-CPlugInterfaceDimensionsRelease1.0-32-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-3USBFull-FeaturedType-CPlugInterfaceDimensions,cont.Release1.0-33-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-3USBFull-FeaturedType-CPlugInterfaceDimensions,cont.Release1.0-34-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-4ReferenceFootprintforaUSBType-CVerticalMountReceptacle(Informative)Release1.0-35-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-5ReferenceFootprintforaUSBType-CDual-RowSMTRightAngleReceptacle(Informative)Release1.0-36-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-6ReferenceFootprintforaUSBType-CHybridRight-AngleReceptacle(Informative)Release1.0-37-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-7ReferenceFootprintforaUSBType-CMid-MountDual-RowSMTReceptacle(Informative)Release1.0-38-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-8ReferenceFootprintforaUSBType-CMid-MountHybridReceptacle(Informative)ThisspecificationrequiresthatallcontactsbepresentinthematinginterfaceoftheUSBType-Creceptacleconnector,butallowstheplugtoincludeonlythecontactsrequiredforUSBPDandUSB2.0functionalityforapplicationsthatonlysupportUSB2.0.TheUSB2.0Type-CplugisshowninFigure3-9.ThefollowingdesignsimplificationsmaybemadewhenonlyUSB2.0issupported:Release1.0-39-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.OnlythecontactsnecessarytosupportUSBPDandUSB2.0arerequiredintheplug.Allotherpinlocationsmaybeunpopulated.SeeTable3-5.AllcontactsarerequiredtobepresentinthematinginterfaceoftheUSBType-Creceptacleconnector.UnliketheUSBFull-FeaturedType-Cplug,theinternalEMCspringsmaybeformedfromthesamestripasthesignal,power,andgroundcontacts.TheinternalEMCspringscontacttheinnersurfaceoftheplugshellandmatewiththereceptacleEMCpadswhentheplugisseatedinthereceptacle.Apaddlecardinsidetheplugmaynotbenecessaryifwiresaredirectlyattachedtothecontactpins.Figure3-9USB2.0Type-CPlugInterfaceDimensionsRelease1.0-40-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-9USB2.0Type-CPlugInterfaceDimensions,cont.Release1.0-41-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.Figure3-9USB2.0Type-CPlugInterfaceDimensions,cont.Release1.0-42-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.3.2.2ReferenceDesignsThissectionprovidesreferencedesignsforafewkeyfeaturesoftheUSBType-Cconnector.Thereferencedesignsareprovidedasacceptabledesignexamples.Theyarenotnormative.3.2.2.1ReceptacleMid-Plate(Informative)Thesignalsbetweenthetopandbottomofthereceptacletongueareisolatedbyamid-plateinsidethetongue.Figure3-10showsareferencedesignofthemid-plate.Itisimportanttopayattentiontothefollowingfeaturesofthemiddleplate:Thedistancebetweenthesignalcontactsandthemid-plateshouldbeaccuratelycontrolledsincethevariationofthisdistancemaysignificantlyimpactimpedanceoftheconnector.Themid-plateinthisparticulardesignprotrudesslightlybeyondthefrontsurfaceofthetongue.Thisistoprotectthetonguefrontsurfacefromdamagecausedbymiss-insertionofsmallobjectsintothereceptacle.Themid-plateisrequiredtobedirectlyconnectedtothePCBgroundwithatleasttwogroundingpoints.Thesidesofthemid-platematewiththeplugsidelatches,makinggroundconnectionstoreduceEMC.Propersurfacefinishesarenecessaryintheareaswherethesidelatchesandmid-plateconnectionsoccur.Figure3-10ReferenceDesignofReceptacleMid-PlateRelease1.0-43-USBType-CCableandAugust11,2014ConnectorSpecificationCopyright©2014USB3.0PromoterGroup.Allrightsreserved.3.2.2.2SideLatch(informative)Thesidelatches(retentionlatches)arelocatedintheplug.Figure3-11showsareferencedesignofablankedsidelatch.Theplugsidelatchesshouldcontactthereceptaclemid-platetoprovideanadditionalgroundreturnpath.Figure3-11ReferenceDesignoftheRetentionLatchFigure3-12IllustrationoftheLatchS