LTC2972 datasheet(46/112 Pages) LINER

46 / 112 page

LTC2972

2972fa

For more information www.linear.com/LTC2972

STORE_USER_ALL and RESTORE_USER_ALL

STORE_USER_ALL, RESTORE_USER_ALL commands provide access to User EEPROM space. Once a command is

stored in User EEPROM, it will be restored with explicit restore command, when the part emerges from power-on reset

after power is applied, or after toggling the Reset pin. While either of these commands is being processed, the part

will indicate it is busy, see Response When Part Is Busy on page 48.

STORE_USER_ALL. Issuing this command will store all operating memory commands with a corresponding EEPROM

memory location.

RESTORE_USER_ALL. Issuing this command will restore all commands from EEPROM Memory. It is recommended

that this command not be executed while a unit is enabled since all monitoring is suspended while the EEPROM is

transferred to operating memory, and intermediate values from EEPROM may not be compatible with the values initially

stored in operating memory.

Bulk Programming the User EEPROM Space

The MFR_EE_UNLOCK, MFR_EE_ERASE and MFR_EE_DATA commands provide a method for 3rd party EEPROM

programming houses and end users to easily program the LTC2972 independent of any order dependencies or delays

between PMBus commands. All data transfers are directly to and from the EEPROM and do not affect the volatile RAM

space currently configuring the device.

Thefirststepistoprogramamasterreferencepartwiththedesiredconfiguration.MFR_EE_UNLOCKandMFR_EE_DATA

are then used to read back all the data in User EEPROM space as sequential words. This information is stored to the

master programming HEX file. Subsequent parts may be cloned to match the master part using MFR_EE_UNLOCK,

MFR_EE_ERASE and MFR_EE_DATA to transfer data from the master HEX file. These commands operate directly on

the EEPROM independent of the part configurations stored in RAM space. During EEPROM access the part will indicate

that it is busy as described below.

In order to support simple programming fixtures the bulk programming features only uses PMBus word and byte com-

mands. The MFR_UNLOCK configures the appropriate access mode and resets an internal address pointer allowing

a series of word commands to behave as a block read or write with the address pointer being incremented after each

operation. PEC use is optional and is configured by the MFR_EE_UNLOCK operation.

PROGRAMMING USER EEPROM SPACE

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

STORE_USER_ALL

0x15

Store entire operating memory to EEPROM.

Send Byte

RESTORE_USER_ALL

0x16

Restore entire operating memory from

EEPROM.

Send Byte

MFR_EE_UNLOCK

0xBD Unlock user EEPROM for access by MFR_

EE_ERASE and MFR_EE_DATA commands.

R/W Byte

Reg

MFR_EE_ERASE

0xBE

Initialize user EEPROM for bulk

programming by MFR_EE_DATA.

R/W Byte

Reg

MFR_EE_DATA

0xBF

Data transferred to and from EEPROM using

sequential PMBus word reads or writes.

Supports bulk programming.

R/W Word

Reg

PMBus COMMAND DESCRIPTION

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