LTM4686BEVPBF datasheet(83/130 Pages) AD

83 / 130 page

LTM4686B

Rev. 0

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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 57.

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 LTM4686B 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 LTM4686B 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 unless the WRITE_PROTECT command is more stringent.

BYTE MEANING

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

EE_UNLOCK and STORE_USER_ALL command

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 registers.

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 registers.

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.

This command has one data byte.

APPENDIX C: PMBUS COMMAND DETAILS

Figure 57. Example of PAGE_PLUS_READ

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

4686B F57

LTM4686BEVPBF Datasheet(PDF) 83 Page - Analog Devices

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