Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
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STATUS_WORD (79h)
TheSTATUS_WORDcommandreturns2bytesofinfor-
mation with a summary of the reason for a fault. The
STATUS_WORDmessagecontentisdescribedinTable19.
STATUS_VOUT (7Ah)
TheSTATUS_VOUTcommandreturns1byteofinforma-
tionwithcontents,asdescribedinTable20.Allthebits
in STATUS_VOUT are latched. When cleared, the bits
are set again if the condition persists, or in the case of
TON_MAX_FAULT,whentheeventoccursagain.
Table 19. STATUS_WORD (79h)
Note: The setting of the SYS_OFF and POWER_GOOD# bits do not assert the ALERT signal.
Table 20. STATUS_VOUT (7Ah)
BIT NAME MEANING
15 VOUT
Anoutputvoltagefaultorwarning,orTON_MAX_FAULT_LIMITorMFR_TON_SEQ_MAX
has occurred.
14 IOUT An overcurrent fault or warning has occurred.
13 0
Thisbitalwaysreturnsa0.
12 MFR AbitinSTATUS_MFR_SPECIFIC(PAGE=255)hasbeenset.
11 POWER_GOOD#
Anypower-supplyvoltagehasfallenfromPOWER_GOOD_ONtolessthanPOWER_GOOD_OFF
(logicalORofallthePOWER_GOOD#bitsinSTATUS_MFR_SPECIFIC).
10 0 Thisbitalwaysreturnsa0.
9 0 Thisbitalwaysreturnsa0.
8 MARGIN A margining fault has occurred.
7 0
Thisbitalwaysreturnsa0.
6 SYS_OFF
Setwhenanyofthepowersuppliesaresequencedoff(logicalORofalltheOFFbitsin
STATUS_MFR_SPECIFC).
5 VOUT_OV An overvoltage fault has occurred.
4 IOUT_OC An overcurrent fault has occurred.
3 0
Thisbitalwaysreturnsa0.
2 TEMPERATURE A temperature fault or warning has occurred.
1 CML A communication, memory, or logic fault has occurred.
0 0
Thisbitalwaysreturnsa0.
BIT NAME MEANING LATCHED
7 VOUT_OV_FAULT
VOUTovervoltagefault. Yes
6 VOUT_OV_WARN
VOUTovervoltagewarning. Yes
5 VOUT_UV_WARN
VOUTundervoltagewarning. Yes
4 VOUT_UV_FAULT
VOUTundervoltagefault. Yes
3 0
Thisbitalwaysreturnsa0. —
2 TON_MAX_FAULT
TON_MAX_FAULT_LIMITorMFR_TON_SEQ_MAXfault. Yes
1 0
Thisbitalwaysreturnsa0. —
0 0
Thisbitalwaysreturnsa0. —