LTM4686B datasheet(82/130 Pages) AD

82 / 130 page

LTM4682

Rev. 0

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PMBus COMMAND DETAILS

SUBORDINATE

ADDRESS

PAGE_PLUS

COMMAND CODE

BLOCK COUNT

(= 2)

W A

PAGE

NUMBER

1 1

…

COMMAND

CODE

SUBORDINATE

ADDRESS

BLOCK COUNT

(= 2)

LOWER DATA

BYTE

R A

UPPER DATA

BYTE

1 1

PEC BYTE

4682 F54

Figure 54. 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 54.

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 LTM4682 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 LTM4682 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 the 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.

LTM4686B Datasheet(PDF) 82 Page - Analog Devices

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