LTM4664 datasheet(91/138 Pages) AD

91 / 138 page

LTM4664A

Rev. 0

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PMBus COMMAND DETAILS

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

4664A F55

Figure 52. Example of PAGE_PLUS_READ

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 the Process Call protocol. An example of the PAGE_PLUS_READ command with PEC is shown

in Figure 52.

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 LTM4664A will NACK the entire PAGE_PLUS packet and issue a CML

fault for Invalid/Unsupported Data.

WRITE_PROTECT

The WRITE_PROTECT command is used to control writing to the LTM4664A device. This command does not indicate

the status of the WP pin which is defined in the MFR_COMMON command. The WP pin takes precedence over the

value of this command.

BYTE MEANING

0x80 Disable all writes except to the WRITE_PROTECT, PAGE, MFR_

EE_UNLOCK, and STORE_USER_ALL commands.

0x40 Disable all writes except to the WRITE_PROTECT, PAGE,

MFR_EE_UNLOCK, MFR_CLEAR_PEAKS, STORE_USER_ALL,

OPERATION and CLEAR_FAULTS command. Individual fault

bits can be cleared by writing a 1 to the respective bits in the

STATUS commands.

0x20 Disable all writes except to the WRITE_PROTECT, OPERATION,

MFR_EE_UNLOCK, MFR_CLEAR_PEAKS, CLEAR_FAULTS,

PAGE, ON_OFF_CONFIG, VOUT_COMMAND and STORE_USER_

ALL. Individual fault bits can be cleared by writing a 1 to the

respective bits in the STATUS commands.

0x10 Reserved, must be 0

0x08 Reserved, must be 0

0x04 Reserved, must be 0

0x02 Reserved, must be 0

0x01 Reserved, must be 0

Enable writes to all commands when WRITE_PROTECT is set to 0x00.

If WP pin is high, PAGE, OPERATION, MFR_CLEAR_PEAKS, MFR_EE_UNLOCK, WRITE_PROTECT and CLEAR_

FAULTS commands are supported. Individual fault bits can be cleared by writing a 1 to the respective bits in the

STATUS commands.

LTM4664 Datasheet(PDF) 91 Page - Analog Devices

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