USB1.1 thiab USB2.0
Nov 23, 2019| Shenzhen Shenchuang Hi-tech Electronics Co., Ltd (SChitec) yog lub tuam txhab ua haujlwm siab uas tshwj xeeb hauv xov tooj accessories ntau lawm thiab muag khoom. Peb cov khoom tseem ceeb muaj xws li kev mus ncig, chargers tsheb, USB cables, fais fab nyiaj hauv tuam txhab nyiaj thiab lwm yam khoom siv digital.Tag nrho cov khoom muaj kev nyab xeeb thiab txhim khu kev qha, nrog cov cim styles.products dhau daim ntawv pov thawj xws li CE, FCC, ROHS, UL, PSE, C-Tick, thiab lwm yam. , Yog tias koj txaus siab rau, koj tuaj yeem tiv tauj ceo@schitec.com ncaj qha.
Nyob ruaj ntseg nrog SChitec
USB1.1 thiab USB2.0
USB1.1 yog ib qho kev qhia dav dav rau USB. Nws qhov ceev kis tau tus mob ceev yog 12Mbps, qhov tsawg-ceev kis tau tus mob ceev yog 1.5Mbps (b txhais tau tias me ntsis), 1MB / s (megabyte / thib ob)=8MBPS (megabit). / Thib ob), 12Mbps=1.5MB / thib ob. Tam sim no, feem ntau MP3s yog xws li interface hom.
USB 2.0 specification tau hloov zuj zus los ntawm USB 1.1 specification. Kev sib kis ceev nce mus txog 480Mbps, thiab thaum hloov mus rau MB yog 60MB / s, txaus kom ua tau raws li qhov yuav tsum tau ceev ntawm cov khoom siv feem ntau. Lub USB 2.0 Enhanced Host Controller Interface (EHCI) txhais ib qho kev tsim qauv uas sib haum nrog USB 1.1. Nws tuaj yeem tsav USB 1.1 li nrog USB 2.0 tsav tsheb. Hauv lwm lo lus, tag nrho USB 1.1 tau tshaj li siv tau ncaj qha nrog USB 2.0 interface yam tsis muaj kev txhawj xeeb txog teeb meem kev sib raug zoo, thiab USB cables, plugs thiab lwm yam khoom siv kuj tuaj yeem siv ncaj qha.
Kev hloov pauv hauv kev siv USB rau kev siv tshuab luam ntawv yog qhov kev txhim kho tseem ceeb hauv kev ceev. USB interface muab kev sib txuas ceev ntawm 12Mbps. Qhov no yog ntau tshaj 10 lub sij hawm sai dua qhov chaw nres nkoj sib npaug. Nyob rau ntawm qhov ceev ntawd, lub sij hawm luam tawm cov ntaub ntawv hloov pauv tau txo qis heev. Tus txheej txheem USB 2.0 txuas ntxiv ua rau qhov nrawm nrawm mus rau 480 Mbps, uas yog 20 npaug sai dua li USB ib txwm, thiab txo qis lub sijhawm xa tawm ntawm cov ntaub ntawv luam tawm.
USB yog ib qho siv PC interface uas tsuas muaj 4 xov hlau, 2 khoom siv hluav taws xob, thiab 2 lub teeb liab, yog li cov teeb liab raug xa mus rau serially. USB interface tseem hu ua qhov chaw nres nkoj serial. USB2.
Cov zis voltage thiab tam sim no ntawm USB interface yog + 5V 500mA (qhov tseeb yog qhov yuam kev, qhov siab tshaj plaws tus nqi yog +/- 0.2V, uas yog, tsis tuaj yeem tshaj 4.8 ~ 5.2V)
Plaub kab ntawm USB interface feem ntau muab raws li hauv qab no: kab dub: GND kab liab: vcc ntsuab kab: cov ntaub ntawv + kab dawb: cov ntaub ntawv