LTC2978C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978C' PDF : 64 Pages View PDF
LTC2978
PMBus Command Description
OPERATION
The OPERATION command is used to turn the unit on and off in conjunction with the CONTROLn pin and ON_OFF_CON-
FIG. 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.
OPERATION Data Contents (On_off_config_use_pmbus=1)
SYMBOL
Action
Operation_control[1:0]
BITS
b[7:6]
Turn off immediately
00
Turn on
10
Margin Low (Ignore Faults and
10
Warnings)
Margin Low
10
Margin High (Ignore Faults and
10
Warnings
FUNCTION Margin High
10
Sequence off and margin to
01
nominal
Sequence off and Margin Low
01
(Ignore Faults and Warnings)
Sequence off and Margin Low
01
Sequence off and Margin High
01
(Ignore Faults and Warnings)
Sequence off and Margin High
01
Reserved
Operation_margin[1:0]
b[5:4]
XX
00
01
Operation_fault[1:0]
b[3:2]
XX
XX
01
01
10
10
01
10
10
00
XX
01
01
01
10
10
01
10
10
All remaining combinations
Reserved (read only)
b[1:0]
00
00
00
00
00
00
00
00
00
00
00
OPERATION Data Contents (On_off_config_use_pmbus=0)
SYMBOL
Action
Operation_control[1:0]
BITS
b[7:6]
Output at Nominal
00, 01 or 10
Margin Low (Ignore faults and
Warnings)
00, 01 or 10
Margin Low
FUNCTION
Margin High (Ignore Faults and
Warnings
00, 01 or 10
00, 01 or 10
Margin High
00, 01 or 10
Reserved
Operation_margin[1:0]
b[5:4]
00
01
Operation_fault[1:0]
b[3:2]
XX
01
01
10
10
01
10
10
All remaining combinations
Reserved (read only)
b[1:0]
00
00
00
00
00
30
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