LTC4449 datasheet(71/108 Pages) LINER

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LTC3882-1

Rev A

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PMBUS_REVISION

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

LTC3882-1 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 LTC3882-1 features to the PMBus host device.

The LTC3882-1 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_LTC3882-1

0xD1 LTC3882-1 device-level configuration.

R/W Byte

Reg

0x01

PMBus COMMAND DETAILS (Addressing and Write Protect)

MFR_ADDRESS

The MFR_ADDRESS command sets the seven bits of the PMBus device address for this unit (right justified).

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

0x5B cannot be disabled. The LTC3882-1 always responds at these addresses. Even if bit 6 of MFR_CONFIG_ALL_

LTC3882-1 is set to ignore the device resistor configuration pins, any valid address, or 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 7-bit PMBus address (right justified) for the active channel(s) as

determined by the PAGE command. This address should be common to all channels attached to a single power supply

rail. Setting this command to a value of 0x80 disables rail device 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.

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