 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
HT2201 Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
|
|
|||||||||||||||||||||||||||||
HT2201 Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
|
|
4 / 9 page  Rev. 1.40 4 January 16, 2014 HT2201 Functional Description Pin Function • Serialclock–SCL TheSCLinputisusedforpositiveedgeclock dataintoeachEEPROMdeviceandnegativeedge clockdataoutofeachdevice. • Serialdata–SDA The SDA pin is bidirectional for serial data transfer.Thepinisopen-draindrivenandmaybe wired-ORwithanynumberofotheropen-drainor opencollectordevices. Memory Organization • HT2201,1KSerialEEPROM Internallyorganizedwith128×8-bitwords,the HT2201requiresan8-bitdatawordaddressfor randomwordaddressing. Device Operations • Clockanddatatransition Datatransfermaybeinitiatedonlywhenthebusis notbusy.Duringdatatransfer,thedatalinemust remainstablewhenevertheclocklineishigh. Changesindatalinewhiletheclocklineishigh willbeinterpretedasaSTARTorSTOPcondition. • Startcondition Ahigh-to-lowtransitionofSDAwithSCLhigh isastartconditionwhichmustprecedeanyother command (refer to Start and Stop Definition Timingdiagram). • Stopcondition Alow-to-hightransitionofSDAwithSCLhighis astopcondition.Afterareadsequence,thestop commandwillplacetheEEPROMinastandby powermode(refertoStartandStopDefinition TimingDiagram). • Acknowledge All addresses and data words are serially transmittedtoandfromtheEEPROMin8-bit words.TheEEPROMsendsazerotoacknowledge thatithasreceivedeachword.Thishappensduring theninthclockcycle. SC L SD A Da ta a ll ow ed to c hange A ddr e ss or a ck now l edge va li d St op co nd it io n St ar t c ondi ti on No A CK st at e Device Addressing TheHT2201requiresan8-bitdeviceaddressword followingastartconditiontoenablethechipfora readorwriteoperation.Thedeviceaddressword consistofamandatoryone,zerosequenceforthe firstfourmostsignificantbits(refertothediagram showingtheDeviceAddress).Thisiscommontoall theEEPROMdevice.Thenextthreebitsarefixedto zeros. The 8th bit of device address is the read/write operationselectbit.Areadoperationisinitiatedifthis bitishighandawriteoperationisinitiatedifthisbit islow. R/ W 10 De vi ce A ddr es s 10 000 Write Operations • Bytewrite Awriteoperationrequiresan8-bitdataword addressfollowingthedeviceaddresswordand acknowledgment.Uponreceiptofthisaddress, the EEPROM will again respond with a zero andthenclockinthefirst8-bitdataword.After receivingthe8-bitdataword,theEEPROMwill outputazeroandtheaddressingdevice,suchasa microcontroller,mustterminatethewritesequence withastopcondition.AtthistimetheEEPROM entersaninternally-timedwritecycletothenon- volatilememory.Allinputsaredisabledduringthis writecycleandEEPROMwillnotresponduntil thewriteiscompleted(refertoBytewritetiming). • Acknowledgepolling Tomaximisebusthroughput,onetechniqueisto allowthemastertopollforanacknowledgesignal afterthestartconditionandthecontrolbytefor awritecommandhavebeensent.Ifthedeviceis stillbusyimplementingitswritecycle,thenno ACKwillbereturned.Themastercansendthe nextread/writecommandwhentheACKsignal hasfinallybeenreceived. • Readoperations The HT2201 supports three read operations, namely,currentaddressread,randomaddress readandsequentialread.Duringreadoperation execution,theread/writeselectbitshouldbesetto "1". |
|
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
