Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
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Table 2. Device Channel Capabilities and Options
MAX34451
CHANNEL
PMBus
COMMAND
PAGE
CHANNEL CAPABILITIES
0–7 0–7
Voltage Monitor/Sequence/Margin/GPO Option:
PinsRSn/GPIn,PSENn,andPWMn(wheren=0–7)haveaone-to-oneassociationforeach
channelthatmonitorsforvoltage(RSn)andcanbeusedtosequence(PSENn)andmargin
(PWMn)thepowersupply.Thevoltagemonitoredonthischannelcanalsobeconguredto
determine a power-good state. If not required for either sequencing or margining, the associated
PSENnandPWMnoutputscanberepurposedasGPOnoutputsthatcaneitherindicatealogic
combinationofpower-good(PG)andGPIstatesorreportalarms.
Current Monitor/GPO Option:
IftheRSn/GPIninputisusedtomonitorcurrent,thenthechannelisnotusedtosequenceor
margin.TheassociatedPSENnandPWMnoutputscanberepurposedasGPOnoutputsthatcan
eitherindicatealogiccombinationofpower-good(PG)andGPIstatesorreportalarms.
GPI/GPO Option:
IftheRSn/GPIninputisconguredasageneral-purposeinput(GPI),itcanbeusedasatermin
alogiccombinationtodetermineapower-good(PG)stateandassertaGPOnoutputoractasa
conditiontoallowapowersupplytobeenabled.TheassociatedPSENnandPWMnoutputscan
berepurposedasGPOnoutputsthatcanindicatepower-good(PG)statesorreportalarms.
8–11 8–11
Same as Channels 0–7 Except No PWM Outputs:
PinsRSn/GPIn,andPSENn(wheren=8–11)arethesameaschannels0–7,exceptthePWMn
outputsforthesechannelsdonotexistandinsteadthedeviceusesanexternalDS4424current
DAC(connectedtothemasterI
2
Clocalbus)tomarginthepowersupplies.Thesechannelscan
alsobeusedtomonitorcurrentorbeusedasGPIninputsjustlikechannels0–7.
12–15 12–15
PinsRSn/GPIn(wheren=12–15)cannotbeusedtocontrolsequencingorformargining.
Voltage Monitor Option:
Monitorvoltageincludingchannelpower-good(PG)andcanalsobeconguredtoshutdownone
or more power supplies if a fault occurs.
Current Monitor Option:
Monitorcurrentandcanbeconguredtoshutdownoneormorepowersuppliesifafaultoccurs.
GPI Option:
Asageneral-purposeinput(GPI),canbeusedasaterminalogiccombinationtodeterminea
power-good(PG)stateandassertaGPOnoutputoractasaconditiontoallowapowersupplyto
be enabled.