LTC2972 datasheet(22/112 Pages) LINER

22 / 112 page

LTC2972

2972fa

For more information www.linear.com/LTC2972

OPERATION

EEPROM Related Commands

COMMAND

TYPICAL DELAY* COMMENT

STORE_USER_ALL

tMASS_WRITE

See Electrical Characterization table. The LTC2972 will not accept any commands while it is transferring

RESTORE_USER_ALL

30ms

The LTC2972 will not accept any commands while it is transferring EEPROM data to command registers.

The command byte will be NACKed. MFR_COMMON may always be read.

MFR_FAULT_LOG_CLEAR

175ms

The LTC2972 will not accept any commands while it is initializing the fault log EEPROM space. The

command byte will be NACKed. MFR_COMMON may always be read.

MFR_FAULT_LOG_STORE

20ms

The LTC2972 will not accept any commands while it is transferring fault log RAM buffer to EEPROM space.

The command byte will be NACKed. MFR_COMMON may always be read.

Internal Fault log

20ms

An internal fault log event is a one time event that uploads the contents of the fault log to EEPROM in

response to a fault. Internal fault logging may be disabled. Commands received during this EEPROM write

are NACKed. MFR_COMMON may always be read.

MFR_FAULT_LOG_

RESTORE

2ms

The LTC2972 will not accept any commands while it is transferring EEPROM data to the fault log RAM

buffer. The command byte will be NACKed. MFR_COMMON may always be read.

*The typical delay is measured from the command’s stop to the next command’s start.

Other Commands

COMMAND

TYPICAL DELAY* COMMENT

MFR_CONFIG

<50µs

The LTC2972 will not accept any commands while it is completing this command. The command byte will

be NACKed. MFR_COMMON may always be read.

IOUT_CAL_GAIN and

IOUT_CAL_OFFSET

<500µs

The LTC2972 will not accept any commands while it is completing this command. The command byte will

be NACKed. MFR_COMMON may always be read.

*The delay is measured from the command’s stop to the next command’s start.

Other PMBus Timing Notes

COMMAND

COMMENT

CLEAR_FAULTS

The LTC2972 will accept commands while it is completing this command but the affected status flags will not be cleared for

up to 500µs.

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