Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
www.maximintegrated.com
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IOUT_OC_FAULT_LIMIT (4Ah)
The IOUT_OC_FAULT_LIMIT command sets the value
of the current that causes an overcurrent fault. The
monitored current must decrease by at least 5% below
the limit before the fault is allowed to clear. This fault is
masked until the current is below this limit for the first
time.The2databytesareinDIRECTformat.Inresponse
to violation of the IOUT_OC_FAULT_LIMIT, the device
doesthefollowing:
1) SetstheIOUTbitinSTATUS_WORD.
2) SetstheIOUT_OC_FAULTbitinSTATUS_IOUT.
3) Responds as specified in the MFR_FAULT_
RESPONSE.
4) NotifiesthehostusingALERT assertion (if enabled in
MFR_MODE).
OT_FAULT_LIMIT (4Fh)
The OT_FAULT_LIMIT command sets the temperature,
in degrees Celsius, of the selected temperature sensor
at which an overtemperature fault is detected. The moni-
tored temperature must drop by at least4°Cbelowthe
limit before the fault is allowed to clear. The 2 data bytes
are in DIRECT format. In response to the OT_FAULT_
LIMITbeingexceeded,thedevicedoesthefollowing:
1) SetstheTEMPERATUREbitinSTATUS_WORD.
2) SetstheOT_FAULTbitinSTATUS_TEMPERATURE
register.
3)
RespondsasspecifiedintheMFR_FAULT_RESPONSE.
4) NotifiesthehostusingALERT assertion (if enabled in
MFR_MODE).
OT_WARN_LIMIT (51h)
The OT_WARN_LIMIT command sets the temperature,
in degrees Celsius, of the selected temperature sensor
at which an overtemperature warning is detected. The
monitoredtemperaturemustdropbyatleast4°Cbelow
the limit before the warning is allowed to clear. The 2
data bytes are in DIRECT format. In response to the
OT_WARN_LIMITbeingexceeded,thedevice doesthe
following:
1) SetstheTEMPERATUREbitinSTATUS_WORD.
2) SetstheOT_WARNbitinSTATUS_TEMPERATURE
register.
3) NotifiesthehostthroughALERT assertion (if enabled
inMFR_MODE).
POWER_GOOD_ON (5Eh)
ThePOWER_GOOD_ONcommandsetsthevalueofthe
output voltage that the channel must exceed for a power-
good state to be declared on this channel. All power sup-
pliesmustalsobeabovePOWER_GOOD_ONforpower-
supply margining to begin. The POWER_GOOD_ON
thresholdisalsousedtodetermineifTON_MAX_FAULT_
LIMIT is exceeded. The POWER_GOOD_ON level is
normallysethigherthanthePOWER_GOOD_OFFlevel.
The2databytesareinDIRECTformat.
POWER_GOOD_OFF (5Fh)
The POWER_GOOD_OFF command sets the value of
the output voltage that causes the power-good state on
this channel to deassert after it has been asserted. The
POWER_GOOD_OFF level is normally set lower than
thePOWER_GOOD_ONlevel.The2databytesarein
DIRECTformat.
WhentheVOUTlevelofapowersupplyfallsfromgreater
thanPOWER_GOOD_ONtolessthanPOWER_GOOD_
OFF,thedevicedoesthefollowing:
1) SetsthePOWER_GOOD#bitinSTATUS_WORD.
2) Sets the POWER_GOOD# bit in STATUS_MFR_
SPECIFICregister(PAGES0–11).
TON_DELAY (60h)
In the PMBus sequencing configuration, TON_DELAY
sets the time, in milliseconds, from when a START
condition is received until the PSENn output is asserted.
If the PSENn/GPOn output has been configured (with
the MFR_PSEN_CONFIG command) as a PG/GPI or
alarm, then this command can be used to delay the assertion
oftheoutput.The2databytesareinDIRECTformat.
TOFF_DELAY (64h)
TOFF_DELAY sets the time, in milliseconds,from when a
STOP condition is received (a soft-off OPERATION com-
mand,orthroughtheCONTROLnpinswhenenabled)until
the PSENn output is deasserted. When commanded to
turnoffimmediately (either through theOPERATIONcom-
mandortheCONTROLnpins),theTOFF_DELAYvalueis
ignored. If the PSENn/GPOn output has been configured
(withtheMFR_PSEN_CONFIGcommand)asaPG/GPIor
alarm, then this command can be used to delay the deasser-
tionoftheoutput.The2databytesareinDIRECTformat.