LTM4677 datasheet(72/110 Pages) AD

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LTC3888-1

Rev. 0

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PMBUS_REVISION

The PMBUS_REVISION command returns the revision of the PMBus Specification that the device supports. The

LTC3888-1 is compliant with PMBus Version 1.2, both Part I and Part II.

This read-only command has one data byte.

CAPABILITY

The CAPABILITY command reports some key LTC3888-1 features to the PMBus host device.

The LTC3888-1 supports packet error checking, 400kHz bus speeds and has an ALERT output.

This read-only command has one data byte.

GENERAL DEVICE CONFIGURATION

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

PMBUS_REVISION

0x98 Supported PMBus version.

R Byte

Reg

0x22

V1.2

CAPABILITY

0x19 Summary of supported optional PMBus

features.

R Byte

Reg

0xB0

MFR_CONFIG_ALL

0xD1 General device-level configuration.

R/W Byte

Reg

0x21

MFR_ADDRESS

The MFR_ADDRESS command sets the seven bits of the PMBus device address for this unit.

Setting this command to a value of 0x80 disables device-level addressing. The global device addresses 0x5A and

0x5B cannot be disabled. The LTC3888-1 always responds at these addresses. The device address, or any portion of

an address, specified with external resistors on ASEL0 or ASEL1 is applied. If both of these pins are open, the device

address is determined strictly by the MFR_ADDRESS value stored in EEPROM. Refer to the Operation section on

Resistor Configuration Pins for additional details.

This command has one data byte.

MFR_RAIL_ADDRESS

The MFR_RAIL_ADDRESS command sets a direct PMBus address for the active channel(s) as determined by the PAGE

command. This address should be common to all master channels attached to a single power supply rail. Setting this

command to a value of 0x80 disables rail addressing for the selected channel. Only command writes should be made

to the rail address. If a read is performed from this address, a CML fault may result.

This command has one data byte.

PMBus COMMAND DETAILS (Addressing and Write Protect/General Device Configuration)

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