ADM1266ACPZ-R7 datasheet(30/62 Pages) AD

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ADM1266

Data Sheet

Rev. A | Page 30 of 62

DATA TRANSFER COMMANDS

Data transfer using the PMBus slave is established using PMBus

commands. The PMBus specification requires that all PMBus

commands start with a slave address with the R/W bit cleared

(set to 0), followed by the command code. (The only exception is

the alert response address protocol.)

All PMBus commands supported by the ADM1266 device follow

one of the protocol types shown in Figure 20 to Figure 27. (For

PMBus master devices that do not support PEC, the PEC byte is

removed.) Figure 20 to Figure 27 use the following abbreviations:

•

S is the start condition

•

P is the stop condition

•

Sr is the repeated start condition

•

W is the write bit (0)

•

R is the read bit (1)

•

A is the acknowledge bit (0)

•

NA is the no acknowledge bit (1)

7-BIT SLAVE

ADDRESS

COMMAND

CODE

PEC

BYTE

= MASTER TO SLAVE

= SLAVE TO MASTER

Figure 20. Send Protocol with PEC

7-BIT SLAVE

ADDRESS

COMMAND

CODE

DATA

BYTE

PEC

BYTE

= MASTER TO SLAVE

= SLAVE TO MASTER

Figure 21. Write Byte Protocol with PEC

7-BIT

SLAVE

ADDRESS

COMMAND

CODE

DATA

BYTE

LOW

DATA

BYTE

HIGH

PEC

BYTE

= MASTER TO SLAVE

= SLAVE TO MASTER

Figure 22. Write Word Protocol with PEC

7-BIT

SLAVE

ADDRESS

7-BIT

SLAVE

ADDRESS

COMMAND

CODE

PEC

BYTE

DATA

BYTE

= MASTER TO SLAVE

= SLAVE TO MASTER

Figure 23. Read Byte Protocol with PEC

7-BIT

SLAVE

ADDRESS

7-BIT

SLAVE

ADDRESS

COMMAND

CODE

PEC

BYTE

DATA

BYTE LOW

DATA

BYTE HIGH

= MASTER TO SLAVE

= SLAVE TO MASTER

Figure 24. Read Word Protocol with PEC

7-BIT

SLAVE

ADDRESS

BYTE

COUNT = M

. . .

COMMAND

CODE

PEC

BYTE

DATA

BYTE

DATA

BYTE

= MASTER TO SLAVE

= SLAVE TO MASTER

Figure 25. Block Write Protocol with PEC

7-BIT

SLAVE

ADDRESS

7-BIT

SLAVE

ADDRESS

PEC

BYTE

COMMAND

CODE

DATA

BYTE 1

DATA

BYTE N

BYTE

COUNT = N

= MASTER TO SLAVE

= SLAVE TO MASTER

. . .

Figure 26. Block Read Protocol with PEC

DATA

BYTE 1

DATA

BYTE N

BYTE

COUNT = N

= MASTER TO SLAVE

= SLAVE TO MASTER

. . .

7-BIT

SLAVE

ADDRESS

DATA

BYTE

DATA

BYTE

7-BIT

SLAVE

ADDRESS

BYTE

COUNT = M

COMMAND

CODE

PEC

BYTE

Figure 27. Block Write and Block Read Protocol with PEC

The PMBus slave module of the ADM1266 also supports

manufacturer specific extended commands. These commands

follow the same protocol as the standard PMBus commands.

However, the command code consists of two bytes:

•

Command code extension: 0xFE

•

Extended command code: 0x00 to 0xFF

Using the manufacturer specific extended commands, the PMBus

device manufacturer can add an additional 256 manufacturer

specific commands to its PMBus command set.

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