LTM4686BEVPBF datasheet(38/130 Pages) AD

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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

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

ensuring robust communication and system behavior.

Please refer to the PMBus Communication and Command

Processing subsection in the Applications Information

section for details.

Table 1. Summary of Supported Commands

PMBus COMMAND

NAME, OR FEATURE

CMD CODE

(REGISTER)

COMMAND OR FEATURE

DESCRIPTION

LTM4686B NVM FACTORY-DEFAULT VALUE AND/OR ATTRIBUTES

PAGE

0x00

Channel or page currently targeted

for paged communications.

0x00, read/write, non-paged, not stored in NVM.

OPERATIONn

0x01

Operating mode control. On/off,

margin high and margin low.

0x80, read/write, paged, stored in user-editable NVM.

ON_OFF_CONFIGn

0x02

RUNn pin and On/Off

Configuration.

0x1F, read/write, paged, stored in user-editable NVM.

CLEAR_FAULTS

0x03

Clear any fault bits that have been

set.

Default value not applicable, send byte only, non-paged, not stored in

NVM.

109

PAGE_PLUS_WRITE

0x05

Write a command directly to a

specified page.

Default value not applicable, write-only, non-paged, not stored in NVM.

PAGE_PLUS_READ

0x06

Read a command directly from a

specified page.

Default value not applicable, read/write, non-paged, not stored in NVM.

WRITE_PROTECT

0x10

Level of protection provided by the

device against accidental changes.

0x00, read/write, non-paged, stored in user-editable NVM.

STORE_USER_ALL

0x15

Store user operating memory to

EEPROM (user-editable NVM).

Default value not applicable, send byte only, non-paged, not stored in

NVM.

120

RESTORE_USER_ALL

0x16

Restore user operating memory

from EEPROM.

Default value not applicable, send byte only, non-paged, not stored in NVM.

Identical to MFR_RESET command (0xFD).

121

CAPABILITY

0x19

Summary of PMBus optional

communication protocols

supported by this device.

0xB0, read-only, non-paged, not stored in NVM.

108

SMBALERT_MASKn

0x1B

Mask ALERT activity.

Default mask values: STATUS_VOUTn = 0x00, STATUS_IOUTn = 0x00,

STATUS_INPUT = 0x00, STATUS_TEMPERATUREn = 0x00, STATUS_

CML = 0x00, STATUS_MFR_SPECIFICn = 0x11.

Read/write, paged as indicated, 10 bytes total, stored in NVM

110

VOUT_MODEn

0x20

Output voltage format/exponent.

0x14 (2–12), read-only, paged, not stored in NVM.

VOUT_COMMANDn

0x21

Nominal output voltage set point. 0x1000 (1.000V), read/write, paged, stored in user-editable NVM.

LTM4686B

Rev. 0

For more information www.analog.com

PMBus COMMAND SUMMARY

PMBUS COMMANDS

Table 1 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 specification.

Exceptions or manufacturer specific implementations are

listed in Table 1.

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

implicitly not supported by the manufacturer. Attempting

to access non-supported or reserved commands may

result in a CML

LTM4686BEVPBF 数据表(PDF) 38 Page - Analog Devices

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