LTM4680 datasheet(84/132 Pages) AD

84 / 132 page

LTM4681

Rev. 0

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ADDRESSING AND WRITE PROTECT

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

PAGE

0x00 Provides integration with multi-page PMBus devices.

R/W Byte

Reg

0x00

PAGE_PLUS_WRITE

0x05 Write a supported command directly to a PWM channel. W Block

PAGE_PLUS_READ

0x06 Read a supported command directly from a PWM

channel.

Block

R/W

WRITE_PROTECT

0x10 Level of protection provided by the device against

accidental changes.

R/W Byte

Reg

0x00

MFR_ADDRESS

0xE6 Sets the 7-bit I2C address byte.

R/W Byte

Reg

0x4F

MFR_RAIL_ADDRESS

0xFA Common address for PolyPhase outputs to adjust

common parameters.

R/W Byte

Reg

0x80

PAGE

The PAGE command provides the ability to configure, control and monitor both PWM channels through only one physi-

cal address, either the MFR_ADDRESS or GLOBAL device address. Each PAGE contains the operating commands for

one PWM channel.

Pages 0x00 and 0x01 correspond to Channel 0 and Channel 1, respectively, in this device.

ASEL_01 sets the address for Channel 0 and 1, ASEL_23 sets the address for Channel 2 and 3. Each of the ASEL pins

will have a different programmed address.

Setting PAGE to 0xFF applies any following paged commands to both outputs. With PAGE set to 0xFF the LTM4681

will respond to read commands as if PAGE were set to 0x00 (Channel 0 results).

This command has one data byte.

PAGE_PLUS_WRITE

The PAGE_PLUS_WRITE command provides a way to set the page within a device, send a command, and then send

the data for the command, all in one communication packet. Commands allowed by the present write protection level

may be sent with PAGE_PLUS_WRITE.

The value stored in the PAGE command is not affected by PAGE_PLUS_WRITE. If PAGE_PLUS_WRITE is used to send

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

This command uses Write Block protocol. An example of the PAGE_PLUS_WRITE command with PEC sending a com-

mand that has two data bytes is shown in Figure 53.

PMBus COMMAND DETAILS

SLAVE

ADDRESS

PAGE_PLUS

COMMAND CODE

BLOCK COUNT

(= 4)

W A

PAGE

NUMBER

1 1

…

COMMAND

CODE

UPPER DATA

BYTE

A P

4681 F53

1 1

PEC BYTE

LOWER DATA

BYTE

Figure 53. Example of PAGE_PLUS_WRITE

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 .

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