Linear Technology LTC2977 Demo Board: Octal Power Supply Manager [Requires DC1613] DC2028A DC2028A Data Sheet
Product codes
DC2028A
LTC2977
33
2977fa
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_
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