LTC4449 datasheet(37/108 Pages) LINER

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LTC3882-1

Rev A

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PMBus COMMAND SUMMARY

Table 6. Abbreviations of Supported Data Formats

PMBus

TERMINOLOGY

SPECIFICATION

REFERENCE

LTC

TERMINOLOGY DEFINITION

EXAMPLE

L11 Linear

Part II ¶7.1

Linear_5s_11s Floating point 16-bit data: value = Y • 2N,

where N = b[15:11] and Y = b[10:0], both

two’s compliment binary integers.

b[15:0] = 0x9807 = 10011_000_0000_0111

value = 7 • 2–13 = 854E-6

L16 Linear VOUT_MODE

Part II ¶8.2

Linear_16u

Floating point 16-bit data: value = Y • 2–12,

where Y = b[15:0], an unsigned integer.

b[15:0] = 0x4C00 = 0100_1100_0000_0000

value = 19456 • 2–12 = 4.75

DIRECT

Part II ¶7.2

varies

16-bit data with a custom format

defined in the detailed PMBus command

description.

Often an unsigned or two’s compliment

integer.

Reg register bits

Part II ¶10.3

Reg

Per-bit meaning defined in detailed PMBus

command description.

PMBus STATUS_BYTE command.

ASC text characters

Part II ¶22.2.1

ASCII

ISO/IEC 8859-1 [A05]

LTC (0x4C5443)

PMBus Commands

Table 7 lists supported PMBus commands and manufac-

turer specific commands. Additional information about

these commands can be found in Revision 1.2 of Part II of

thePMBusPowerSystemManagementProtocolSpecifica-

tionthatcanbefoundathttp://www.pmbus.org/specs.html.

Usersareencouragedtoreferencethatmanual.Exceptions

or manufacturer-specific implementations are detailed in

the tables below. All standard PMBus commands from

0x00 through 0xCF not listed in this table are implicitly

not supported by the LTC3882-1. All commands from

0xD0 through 0xFF not listed in this table are implicitly

reservedbythemanufacturer.TheLTC3882-1mayexecute

additional commands not listed in this table, and these

can change without notice. Reading these unlisted com-

mands is harmless to the operation of the IC. Writes to any

unsupported or reserved command should be avoided, as

they may result in a CML fault and/or undesired operation

of the part.

If PMBus commands are received faster than they are be-

ing processed, the part may become too busy to handle

new commands. In these cases the LTC3882-1 follows the

protocols defined in the PMBus Specification V1.2, Part

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

device includes handshaking features to eliminate busy

responses, simplify error handling software and ensure

robust communication and system behavior. Please refer

to PMBus Communication and Command Processing in

the Applications Information section for further details.

LTC has made an effort to establish PMBus command

compatibility and functional uniformity among its family

of parts. However, differences may occur due to specific

productrequirements.CompatibilityofPMBuscommands

among any ICs should not be assumed based simply on

command name. Always refer to the manufacturer’s data

sheet of each device for a complete definition of a com-

mand function.

Data Formats

PMBus supports specific floating point number formats

and allows for a wide range of other data formats.

Table 6 describes the data formats used by the LTC3882-1.

Abbreviations of these formats appear throughout this

document.

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