Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
www.maximintegrated.com
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Multiple Device Connections
Multiple MAX34451 devices can be connected together to
increasethesystemchannelcount.Figure4detailsthe
recommended connection scheme.
All the paralleled devices share the same CONTROLn,
FAULTn, SEQ,andSMBussignals.Thedevicesalluse
acommonsignal(eithertheCONTROL0orCONTROL1
pin,ortheOPERATIONcommand)toenable/disableall
the power supplies. Any of the monitored power supplies
can be configured with the MFR_FAULT_RESPONSE
command to activate one or more of the FAULTn signals
and shut down all the other supplies enabled to respond
to one or more of the FAULTn signals. The FAULT0 signal
is always available, whereas FAULT1 and FAULT2 are
optionalsignals.Whentheyareenabled,thePWM7and
PSEN10outputs(respectively)aredisabled.Theuseof
multiple fault signals allows more flexibility in controlling
which power supplies need to shut down during a fault.
USER NOTE:
●
 All devices must be configured with the same ON_
OFF_CONFIGconfiguration.
● All devices must be powered up and reset at the same
time.
Figure 3. Sequencing Example
POWER_GOOD_ON
TON_MAX_FAULT_LIMIT
TON_DELAY
POWER_GOOD_ON
TON_MAX_FAULT_LIMIT
TON_DELAY
POWER_GOOD_ON
TON_MAX_FAULT_LIMIT
TON_DELAY
POWER_GOOD_ON
TON_MAX_FAULT_LIMIT
TOFF_DELAY
TOFF_DELAY
TOFF_DELAY
TOFF_DELAY
NOTES 1 AND 2
TON_DELAY
POWER-DOWNPOWER-UP
CONTROL0/1 PIN
OR OPERATION COMMAND
PSEN0
RS0
RS2
RS5
RS1
SEQ
PSEN2
PSEN5
PSEN1
NOTES: 1. ALTERNATE POWER-DOWN SEQUENCING OPERATION IS TO SHUT OFF ALL SUPPLIES IMMEDIATELY.
2. THE FAULTn PIN BEING ASSERTED LOW CAN ALSO CAUSE A POWER-DOWN SEQUENCE TO OCCUR.