ADP1048ARQZ-R7 datasheet(35/84 Pages) AD

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Data Sheet

ADP1047/ADP1048

Rev. 0 | Page 35 of 84

DATA TRANSFER

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 35. 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

Figure 35. Basic Data Transfer

Figure 35 through Figure 42 use the following abbreviations:

S = start condition

Sr = repeated start condition

P = stop condition

R = read bit

W = write bit

A = acknowledge bit (0)

A = acknowledge bit (1)

“A” represents the ACK (acknowledge) bit. The ACK bit is typi-

cally active low (Logic 0) if the transmitted byte is successfully

received by a device. However, when the receiving device is the

bus master, the acknowledge bit for the last byte read is a Logic 1,

indicated by A.

Command Overview

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

ADP1047 ADP1048

Figure 36

Figure 42

The PMBus slave module also supports manufacturer-specific

extended commands. These commands follow the same protocol

as the standard PMBus commands. However, the command

code consists of the following two bytes:

•

The command code extension, 0xFE

•

The 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.

SLAVE ADDRESS

COMMAND CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 36. Send Byte Protocol

ADATA BYTE

SLAVE

ADDRESS

COMMAND

CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 37. Write Byte Protocol

COMMAND

CODE

DATA BYTE

LOW

SLAVE

ADDRESS

DATA BYTE

HIGH

MASTER TO SLAVE

SLAVE TO MASTER

Figure 38. Write Word Protocol

SLAVE

ADDRESS

COMMAND

CODE

RDATA BYTE

SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

Figure 39. Read Byte Protocol

SLAVE

ADDRESS

COMMAND

CODE

SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

DATA BYTE

LOW

DATA BYTE

HIGH

Figure 40. Read Word Protocol

SLAVE

ADDRESS

COMMAND

CODE

BYTE COUNT

= N

DATA BYTE 1

DATA BYTE N

MASTER TO SLAVE

SLAVE TO MASTER

Figure 41. Block Write Protocol

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