LTM4686B datasheet(49/132 Pages) AD

49 / 132 page

LTM4683

Rev. 0

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PMBus COMMAND SUMMARY

PMBus COMMANDS

Table 7 lists supported PMBus commands and manufac-

turer-specific commands. A complete description of these

commands can be found in the “PMBus Power System

Management Protocol Specification – Part II – Revision

1.2”. Users are encouraged to reference this specifica-

tion. Exceptions or manufacturer-specific implementations

are listed in Table 7. 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 Section

7.1) format, whichever is appropriate for the command. All

commands from 0xD0 through 0xFF not listed in Table 7

are implicitly reserved by the manufacturer. Users should

avoid blind writes within this range of commands to avoid

the undesired operation of the part. All commands from

0x00 through 0xCF not listed in Table 7 are implicitly 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 mea-

surements 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

being 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. See the

PMBus Communication and Command Processing sub-

section in the Applications Information section for further

details.

Table 7. PMBus Commands Summary (NOTE: The Data Format Abbreviations are Detailed in Table 8)

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

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

112

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

122

RESTORE_USER_ALL

0x16 Restore user operating memory from

EEPROM.

Send Byte

122

CAPABILITY

0x19 Summary of PMBus optional communication

protocols supported by this device.

R Byte

Reg

0xB0

111

SMBALERT_MASK

0x1B Mask ALERT activity

Block R/W

Reg

See CMD

112

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

0.5

0x0800

VOUT_MAX

0x24 The upper limit on the commanded output

voltage, including VOUT_MARGIN_HI.

R/W Word

L16

1.1

0x119A

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