Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
www.maximintegrated.com
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ON_OFF_CONFIG (02h)
TheON_OFF_CONFIGcommandconfiguresthecombi-
nationoftheCONTROLninputandPMBusOPERATION
commands needed to turn the power supply on and
off. This indicates how the power supply is command-
ed when power is applied. The ON_OFF_CONFIG
message content is described in Table 13. The host should
notmodifyON_OFF_CONFIGwhile thepowersupplies
are active. The configuration of the ON_OFF_CONFIG
commandappliestobothCONTROL0andCONTROL1.
SeeFigure5.
Table 13. ON_OFF_CONFIG (02h) Command Byte
*Unless bit 5 is set (if both bits 3:2 are set), both the CONTROL0 or CONTROL1 pin and the OPERATION command are required to
turn the supplies on, and either can turn the supplies off.
BIT PURPOSE VALUE MEANING
7:6 Reserved. n/a
Alwaysreturns000.
5
OPERATIONcommandand
CONTROLnpinand/orselect.
0 OPERATIONcommandisANDedwithCONTROLnpinifbothareenabled.
1 OPERATIONcommandisORedwithCONTROLnpinifbothareenabled.
4
Turn on supplies when bias is
presentorusetheCONTROLn
pin/OPERATIONcommand.
0
Turnsonthesupplies(withsequencingifsocongured)assoonasbiasis
suppliedtothedevice,regardlessoftheCONTROLnpin.
1
UsesCONTROLnpins(ifenabled)and/orOPERATIONcommand
(ifenabled).*
3 OPERATIONcommandenable.
0 On/offportionoftheOPERATIONcommanddisabled.
1 OPERATIONcommandenabled.
2 CONTROLnpinenable.
0 CONTROLnpindisabled.
1 CONTROLnpinenabled.
1 CONTROLnpinpolarity.
0 Activelow(drivelowtoturnonthepowersupplies).
1 Activehigh(drivehightoturnonthepowersupplies).
0 CONTROLnpinturn-offaction.
0 Usestheprogrammedturn-offdelay(soft-off).
1 Turns off the power supplies immediately.