LTM4675 datasheet(40/128 Pages) LINER

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LTC3884/LTC3884-1

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COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE PAGE

PAGE

0x00 Provides integration with multi-page PMBus

devices.

R/W Byte

Reg

0x00

OPERATION

0x01 Operating mode control. On/off, margin high

and margin low.

R/W Byte

Reg

0x80

ON_OFF_CONFIG

0x02 RUN pin and PMBus bus on/off command

configuration.

R/W Byte

Reg

0x1E

CLEAR_FAULTS

0x03 Clear any fault bits that have been set.

Send Byte

102

PAGE_PLUS_WRITE

0x05 Write a command directly to a specified page.

W Block

PAGE_PLUS_READ

0x06 Read a command directly from a specified page. Block R/W

WRITE_PROTECT

0x10 Level of protection provided by the device

against accidental changes.

R/W Byte

Reg

0x00

STORE_USER_ALL

0x15 Store user operating memory to EEPROM.

Send Byte

113

RESTORE_USER_ALL

0x16 Restore user operating memory from EEPROM. Send Byte

113

CAPABILITY

0x19 Summary of PMBus optional communication

protocols supported by this device.

R Byte

Reg

0xB0

101

SMBALERT_MASK

0x1B Mask ALERT activity

Block R/W

Reg

see CMD 103

VOUT_MODE

0x20 Output voltage format and exponent (2–12).

R Byte

Reg

2–12

0x14

VOUT_COMMAND

0x21 Nominal output voltage set point.

R/W Word

L16

1.0

0x1000

VOUT_MAX

0x24 Upper limit on the commanded output voltage

including VOUT_MARGIN_HI.

R/W Word

L16

2.75

0x2C00

VOUT_MARGIN_HIGH

0x25 Margin high output voltage set point. Must be

greater than VOUT_COMMAND.

R/W Word

L16

1.05

0x10CD

VOUT_MARGIN_LOW

0x26 Margin low output voltage set point. Must be

less than VOUT_COMMAND.

R/W Word

L16

0.95

0x0F33

Table 2. Summary (Note: The Data Format abbreviations are detailed at the end of this table.)

PMBus COMMAND SUMMARY

PMBus COMMANDS

ThefollowingtableslistsupportedPMBuscommandsand

manufacturerspecificcommands.Acompletedescription

of these commands can be found in the “PMBus Power

System Mgt Protocol Specification – Part II – Revision

1.2”. Users are encouraged to reference this specification.

Exceptions or manufacturer specific implementations are

listed below in Table 2. Floating point values listed in the

“DEFAULT VALUE” column are either Linear 16-bit Signed

(PMBus Section 8.3.1) or Linear_5s_11s (PMBus Sec-

tion 7.1)format,whicheverisappropriateforthecommand.

All commands from 0xD0 through 0xFF not listed in this

table are implicitly reserved by the manufacturer. Users

should avoid blind writes within this range of commands

to avoid undesired operation of the part. All commands

from 0x00 through 0xCF not listed in this table are im-

plicitly not supported by the manufacturer. Attempting to

access non-supported or reserved commands may result

in a CML command fault event. All output voltage settings

and measurements are based on the VOUT_MODE setting

of 0x14. This translates to an exponent of 2–12.

If PMBus commands are received faster than they are be-

ing processed, the part may become too busy to handle

new commands. In these circumstances the part follows

the protocols defined in the PMBus Specification v1.2,

Part II, Section 10.8.7, to communicate that it is busy.

The part includes handshaking features to eliminate busy

errors and simplify error handling software while ensur-

ing robust communication and system behavior. Please

refer to the subsection titled PMBus Communication and

Command Processing in the Applications Information

section for further details.

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