Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
www.maximintegrated.com
Maxim Integrated │ 61
Figure 13. MFR_PWM_CONFIG Functional Logic
Delay Function
If a delay is configured either on or off, the input must
be continuously static through the delay time before the
outputchangesstate(seeFigure9).
MFR_SEQ_CONFIG (E8h)
TheMFR_SEQ_CONFIGcommandisusedtoconfigure
thesequencingchannels(PAGES0–11).Thiscommand
should not be changed while the power supplies are oper-
ating.TheMFR_SEQ_CONFIGcommandisdescribedin
Table38andshowninFigure2.
Eachchannelcanbeindependentlyconfiguredtoinitiate
power-onsequencing,usingtheSELECT[1:0]bits,toone
ofthefollowingconditions:
● Wait for either SEQUENCE0 or SEQUENCE1 from
ON_OFF_CONFIGdecode(SELECT[1:0]=00)
● Waitforallenabledchannelpower-good(PG)orGPI
tobeasserted(SELECT[1:0]=01)
● WaitforamatchontheSEQpin(SELECT[2:0]=10)
If SELECT[1:0] = 00, then the channel waits for either
the SEQUENCE0 or SEQUENCE1 signal to assert
before powering on. The sequence signal to use is
selected with the SEQ_SELECT bit. The SEQUENCE0
and SEQUENCE1 signals are generated by decoding
theOPERATIONcommandandCONTROLnpinsusing
the ON_OFF_CONFIG command. See the ON_OFF_
CONFIGcommanddescriptionfordetails.Thisselection
would be used if the channel is being controlled by time-
based sequencing.
IfSELECT[1:0]=01,thensequencingforthechannelis
initiatedwhensomecombination ofpower-goods(PGs)
and general-purpose inputs (GPIs) 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powergoodorGPIfromthechannelisusedinthe
logical combination to initiate the power-on sequencing.
This selection would be used if the channel is being con-
trolled by event-based sequencing.
IfSELECT[1:0]=10,thensequencingisinitiatedwhen
the channel matches the selected signature on the
SEQ pin. The signature to match on is selected with the
SEQ_MATCHbits. The SEQ signal is used to facilitate
event-based sequencing in multiple-device systems. This
selection would be used if the channel is being controlled
by event-based sequencing.
FORCE GPO ASSERTION
FORCE GPO DEASSERTION
ON_DELAY
OFF_DELAY
OR
OR
AND
16 6
16
16
16
16
SELECT
000
001
010
100
011
NOTE: SIGNALS LISTED IN ITALICS ARE INTERNAL SIGNALS THAT CONNECT TO OTHER DEVICE FUNCTIONS.
SHADED BLOCKS ARE PMBus COMMANDS.
PWMx
(x = 0–7)
SELECT
ALARM0–
ALARM15
AND
AND
PG0/GPI0–
PG15/GPI15
BITS 31:16 BITS 2:0 BIT 6BITS 15:8 BIT 7
MFR_PWM_CONFIG
NOT AVAILABLE FOR
PWMn OR FAULT1 OR
FORCE GPO ASSERTION
OR DEASSERTION
NOT AVAILABLE FOR
PWMn OR FAULT1
ACTIVE HIGH/LOW
OPEN DRAIN/PUSH-PULL
PWMx/GPOy
(x = 0–6)
(x = 12–18)
PWM7
GPO19
FAULT1
FAULT1