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ControlByte
DAC6573
SLAS402–NOVEMBER2003
MSBLSB
A3A2L1L0XSel1Sel0PD0
table1.controlregisterbitdescriptions
bitnamebitnumber/描述
A3Extendedaddressbit
ThestateofthesebitsmustmatchthestateofpinsA3andA2inorderforaproper
dac6573dataupdate,exceptinbroadcastupdatemode.
A2Extendedaddressbit
l1load1(modeselect)位
areusedforselectingtheupdatemode.
l2load0(modeselect)位
00StoreI
2
cdata.thecontentsofms-byteandls-字节(orpowerdowninformation)arestoredinthe
temporaryregisterofaselectedchannel.thismodedoesnotchangethedacoutputoftheselected
频道.
01UpdateselectedDACwithI
2
cdata.mostcommonlyutilizedmode.thecontentsofms-byteand
ls-字节(orpowerdowninformation)arestoredinthetemporaryregisterandinthedacregisterofthe
selectedchannel.thismodechangesthedacoutputoftheselectedchannelwiththenewdata.
104-channelsynchronousupdate.thecontentsofms-byteandls-字节(orpowerdowninformation)是
storedinthetemporaryregisterandinthedacregisteroftheselectedchannel.同时发生地,这
otherthreechannelsgetupdatedwithpreviouslystoreddatafromthetemporaryregister.thismode
updatesallfourchannelstogether.
11broadcastupdatemode.thismodehastwofunctions.inbroadcastmode,dac6573responds
regardlessoflocaladdressmatching,andchannelselectionbecomesirrelevantasallchannelsupdate.
thismodeisintendedtoenableupto64channelssimultaneousupdate,ifusedwiththei
2
Cbroadcast
地址(10010000).
ifsel1=0allfourchannelsareupdatedwiththecontentsoftheirtemporaryregisterdata.
ifsel1=1allfourchannelsareupdatedwiththems-byteandls-bytedataorpowerdown.
Sel1BuffSel1Bit
Channelselectbits
Sel0BuffSel0Bit
00ChannelA
01ChannelB
10ChannelC
11ChannelD
PD0PowerDownFlag
0Normaloperation
1power-downflag(msb7andmsb6indicateapower-downoperation,asshownintable2).
15
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