Datasheet

LTC2977
33
2977fa
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OPERATION, MODE AND EEPROM COMMANDS
OPERATION
The OPERATION command is used to turn the unit on and off in conjunction with the CONTROLn pin and ON_OFF_
CONFIG. This command register responds to the global page command (PAGE=0xFF). The contents and functions of
the data byte are shown in the following tables. A minimum t
OFF_MIN
wait time must be observed between OPERATION
commands used to turn the unit off and then back on.
OPERATION Data Contents (On_off_config_use_pmbus=1)
SYMBOL Action Operation_control[1:0] Operation_margin[1:0] Operation_fault[1:0] Reserved (read only)
BITS b[7:6] b[5:4] b[3:2] b[1:0]
FUNCTION
Turn off immediately 00 XX XX 00
Turn on 10 00 XX 00
Margin Low (Ignore Faults and
Warnings)
10 01 01 00
Margin Low 10 01 10 00
Margin High (Ignore Faults and
Warnings
10 10 01 00
Margin High 10 10 10 00
Sequence off and margin to
nominal
01 00 XX 00
Sequence off and Margin Low
(Ignore Faults and Warnings)
01 01 01 00
Sequence off and Margin Low 01 01 10 00
Sequence off and Margin High
(Ignore Faults and Warnings)
01 10 01 00
Sequence off and Margin High 01 10 10 00
Reserved All remaining combinations
OPERATION Data Contents (On_off_config_use_pmbus=0)
SYMBOL Action Operation_control[1:0] Operation_margin[1:0] Operation_fault[1:0] Reserved (read only)
BITS b[7:6] b[5:4] b[3:2] b[1:0]
FUNCTION
Output at Nominal 00, 01 or 10 00 XX 00
Margin Low (Ignore faults and
Warnings)
00, 01 or 10 01 01 00
Margin Low 00, 01 or 10 01 10 00
Margin High (Ignore Faults and
Warnings
00, 01 or 10 10 01 00
Margin High 00, 01 or 10 10 10 00
Reserved All remaining combinations
PMBus COMMAND DESCRIPTION