LTM2987 datasheet(39/114 Pages) AD

39 / 114 page

LTC2971

Rev. 0

For more information www.analog.com

OPERATION

The OPERATION command is used to turn the unit on and off in conjunction with the CONTROL 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 tOFF_MIN wait time must be observed between any 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

Sequence on

Margin low (ignore faults and warnings)

Margin low

Margin high (ignore faults and warnings

Margin high

Sequence off with margin to nominal

Sequence off with margin low (ignore

faults and warnings)

Sequence off with margin low

Sequence off with margin high (ignore

faults and warnings)

Sequence off with margin high

Reserved

All remaining combinations

OPERATION Data Contents (On_off_config_use_pmbus = 0)

On or Off

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

Margin low (ignore faults and

warnings)

00, 01 or 10

Margin low

00, 01 or 10

Margin high (ignore faults and

warnings

00, 01 or 10

Margin high

00, 01 or 10

Reserved

All remaining combinations

PMBus COMMAND DESCRIPTION

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