LTC2972 datasheet(31/112 Pages) LINER

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LTC2972

2972fa

For more information www.linear.com/LTC2972

ADDRESSING AND WRITE PROTECT

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

0x00

Channel or page currently selected for any

command that supports paging.

R/W Byte

Reg

0x00

WRITE_PROTECT

0x10

Level of protection provided by the device

against accidental changes.

R/W Byte

Reg

0x00

MFR_I2C_BASE_ADDRESS

0xE6

Base value of the I2C/SMBus address byte. R/W Byte

Reg

0x5C

MFR_PAGE_FF_MASK

0xE4

Configuration defining which channels

respond to global page commands

(PAGE=0xFF).

R/W Byte

Reg

0x03

MFR_COMMAND_PLUS

0xC8

Alternate access to block read and other

data. Commands for all additional hosts.

R/W Word

Reg

MFR_DATA_PLUS0

0xC9

Alternate access to block read and other

data. Data for additional host 0.

R/W Word

Reg

MFR_DATA_PLUS1

0xCA

Alternate access to block read and other

data. Data for additional host 1.

R/W Word

Reg

PMBus COMMAND DESCRIPTION

PAGE

The LTC2972 has two pages that correspond to the two DC/DC converter channels that can be managed. Each DC/DC

converter channel can be uniquely programmed by first setting the appropriate page.

Setting PAGE = 0xFF allows a simultaneous write to both pages for PMBus commands that support global page pro-

gramming. The only commands that support PAGE = 0xFF are CLEAR_FAULTS, OPERATION and ON_OFF_CONFIG.

See MFR_PAGE_FF_MASK for additional options. Reading any paged PMBus register with PAGE = 0xFF returns un-

predictable data and will trigger a CML fault. Writes to paged commands that do not support PAGE = 0xFF with PAGE

= 0xFF will be ignored and generate a CML fault.

PAGE Data Contents

BIT(S) SYMBOL OPERATION

b[7:0] Page

Page operation.

0x00: All PMBus commands address channel/page 0.

0x01: All PMBus commands address channel/page 1.

0xXX: All non specified values reserved.

0xFF: A single PMBus write/send to commands that support this mode will simultaneously address all channel/pages with

MFR_PAGE_FF_MASK enabled.

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