Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
www.maximintegrated.com
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MFR_PSEN_CONFIG (D2h)
The MFR_PSEN_CONFIG command is used to con-
figure the individual PSENn/GPOn (where n = 0–11)
outputs. This command should not be changed while the
powersuppliesareoperating.TheMFR_PSEN_CONFIG
commandisdescribedinTable27andshowninFigure8.
EachPSENn/GPOnpincanbeindependentlyconfigured
usingtheSELECT[2:0]bitstooneofthefollowing:
● Enableanddisabledpowersupplies(SELECT[2:0]=
000)
● Forcepinassertion(SELECT[2:0]=001)
● Forcepindeassertion(SELECT[2:0]=010)
● Assertwhenallenabledchannelpower-good(PG)or
GPIareasserted(SELECT[2:0]=011)
● Assert when any enabled alarm goes active
(SELECT[2:0]=100)
Ifthe PSENn/GPOn output is configured to enableand
disable power supplies (SELECT[2:0] = 000), then the
associated input channel must also be configured to
monitorvoltageandtosequencebysettingtheSELECT
bits in MFR_CHANNEL_CONFIG to 10h. See the
MFR_CHANNEL_CONFIG (E4h) for more details.
Also,eachPSENn/GPOnpincanbeindependentlyconfig-
ured to be active high or active low and either push-pull or
opendrainusingtheHI_LOandPP_ODbits,respectively.
IfSELECT[2:0]=011,thePSENn/GPOnoutputisconfig-
ured to assert when some combination of power goods
(PGs)andgeneral-purposeinputs(GPIs)fromeachchan-
nel are asserted. The channels that should be used in this
combination are selected using the PG_GPI_SELECT
bits31:16.IfthePG_GPI_SELECTbitiscleared,thenthe
associated channel is not used in the logical combination
to assert the GPOn output. IfthePG_GPI_SELECTbit
isset,then thePGorGPI fromthischannelisusedin
thelogicalcombinationtoasserttheGPOnoutput.This
function is useful in creating system power-good signals.
IfSELECT[2:0]=100,thePSENn/GPOnoutputisconfig-
ured to assert when any of the enabled channel alarms
goes active. The channel alarms are enabled with the
ALARM_SELECTbits31:16.IftheALARM_SELECTbit
is cleared, then the alarm from this channel is blocked. If
theALARM_SELECTbitisset,thealarmfromthischan-
nel is routed to an OR function such that any enabled
alarm asserts the GPOn output. The alarm function is
chosen with the ALARM_CONFIG bits in the MFR_
FAULT_RESPONSEcommand.Thisfunctionisusefulis
insystemdebugorforenablingsystemstatusLEDs.
Table 27. MFR_PSEN_CONFIG (D2h)
BIT NAME MEANING
31:16
PG_GPI_SELECT
ALARM_SELECT
ThesebitsareonlyusedifSELECT[2:0]=011or100.Eachbitcorrespondstoone
channel(devicechannelN+16=bitnumber):
SELECT[2:0] BITFUNCTION
011
Whenthisbitiscleared,thepowergood(PG)orGPIfrom
channelNisnotusedinthelogicalANDtoasserttheGPOn
output.Whenthisbitisset,thePGorGPIisused.
100
Whenthisbitiscleared,thealarmfromchannelNisblocked
fromthelogicalORtoasserttheGPOnoutput.Whenthisbit
isset,thealarmsignalisroutedtothelogicalOR.
15:8 0 Thesebitsalwaysreturna0.
7 PP_OD
0=PSEN/GPOpush-pulloutput
1=PSEN/GPOopen-drainoutput
6 HI_LO
0=PSEN/GPOactivelow
1=PSEN/GPOactivehigh
5:3 0 Thesebitsalwaysreturna0.