LTC4449 datasheet(70/108 Pages) LINER

70 / 108 page

LTC3882-1

Rev A

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Figure 50. Example of PAGE_PLUS_READ

WRITE_PROTECT

The WRITE_PROTECT command is used to control PMBus write access to the LTC3882-1.

Supported Values:

VALUE

MEANING

0x80

Disable all writes except WRITE_PROTECT, PAGE, STORE_USER_ALL and MFR_EE_UNLOCK commands.

0x40

Disable all writes except WRITE_PROTECT, PAGE, STORE_USER_ALL, MFR_EE_UNLOCK, OPERATION, CLEAR_PEAKS and CLEAR_FAULTS

commands. Individual faults can also be cleared by writing a 1 to the respective status bit.

0x20

Disable all writes except WRITE_PROTECT, PAGE, STORE_USER_ ALL, MFR_EE_UNLOCK, OPERATION, CLEAR_PEAKS, CLEAR_FAULTS,

ON_OFF_CONFIG and VOUT_COMMAND commands. Individual faults can be cleared by writing a 1 to the respective status bit.

0x00

Enables writes to all commands.

This command has one data byte.

SLAVE

ADDRESS

PAGE_PLUS

COMMAND CODE

BLOCK COUNT

(= 2)

W A

PAGE

NUMBER

1 1

…

COMMAND

CODE

SLAVE

ADDRESS

BLOCK COUNT

(= 2)

LOWER DATA

BYTE

R A

UPPER DATA

BYTE

1 1

PEC BYTE

38821 F50

PMBus COMMAND DETAILS (Addressing and Write Protect)

PAGE_PLUS_READ

The PAGE_PLUS_READ command provides the ability to set the page within a device, send a command and then read

the data returned by the command, all in one communication packet .

The value stored in the PAGE command is not affected by PAGE_PLUS_READ. If PAGE_PLUS_READ is used to access

data from a non-paged command, the Page Number byte is ignored.

This command uses Block Write – Block Read Process Call protocol. An example of the PAGE_PLUS_READ command

with PEC is shown in Figure 50.

NOTE: PAGE_PLUS commands cannot be nested. A PAGE_PLUS command cannot be used to read or write another

PAGE_PLUS command. If this is attempted, the LTC3882-1 will NACK the entire PAGE_PLUS packet and issue a CML

fault for Invalid/Unsupported Data.

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