ADP1053ACPZ-R7 datasheet(35/84 Pages) AD

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Data Sheet

ADP1053

Rev. A | Page 35 of 84

Command Overview

DATA TRANSFER

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. All PMBus commands

supported by the

follow one of the protocol types

shown in

through

ADP1053

Figure 31

Figure 37

Format Overview

The PMBus slave follows the transfer protocol of the SMBus

specification, which is based on the fundamental transfer

protocol format of the Philips I2C Bus Specification, dated

January 2000. Data transfers are byte wide, lower byte first.

Each byte is transmitted serially, most significant bit (MSB)

first. A typical transfer is diagrammed in Figure 30. See the

SMBus and I2C specifications for an in-depth discussion of

the transfer protocols.

MASTER TO SLAVE

SLAVE TO MASTER

7-BIT SLAVE

ADDRESS

8-BIT DATA

The ADP1053 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 that range from 0xFE00 to 0xFFFF.

Using the manufacturer-specific extended commands, the PMBus

device manufacturer can add an additional 256 manufacturer-

specific commands to its PMBus command set.

Figure 30. Basic Data Transfer

Figure 30 through Figure 37 use the following abbreviations:

S = start condition

P = stop condition

Sr = repeated start condition

W = write bit (0)

R = read bit (1)

A = acknowledge bit (0)

A = not-acknowledge bit (1)

7-BIT SLAVE ADDRESS

COMMAND CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 31. Send Byte Protocol

ADATA BYTE

7-BIT SLAVE

ADDRESS

COMMAND

CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 32. Write Byte Protocol

COMMAND

CODE

DATA BYTE

LOW

7-BIT SLAVE

ADDRESS

DATA BYTE

HIGH

MASTER TO SLAVE

SLAVE TO MASTER

Figure 33. Write Word Protocol

7-BIT SLAVE

ADDRESS

COMMAND

CODE

RDATA BYTE

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

Figure 34. Read Byte Protocol

7-BIT SLAVE

ADDRESS

COMMAND

CODE

Sr 7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

DATA BYTE

LOW

DATA BYTE

HIGH

Figure 35. Read Word Protocol

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