ADP1052ACPZ-R7 datasheet(47/113 Pages) AD

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Data Sheet

ADP1052

Rev. B | Page 47 of 113

Table 11. Abbreviations Used in Data Transfer Diagrams

Abbreviation

Description

Setting1

Start condition

N/A

Stop condition

N/A

Repeated start condition

N/A

Write bit

Read bit

Acknowledge bit

No acknowledge bit

1 N/A means not applicable.

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

to 0, followed by the command code. All PMBus commands that

are supported by the ADP1052 follow one of the protocol types

shown in Figure 47 through Figure 53.

The ADP1052 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 0xFF00 to 0xFFAF.

Using the manufacturer specific extended commands, the PMBus

device manufacturer can add an additional 256 manufacturer

specific commands to its PMBus command set.

MASTER TO SLAVE

SLAVE TO MASTER

7-BIT SLAVE

ADDRESS

8-BIT DATA

Figure 46. Basic Data Transfer

7-BIT SLAVE ADDRESS

COMMAND CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 47. Send Byte Protocol

ADATA BYTE

7-BIT SLAVE

ADDRESS

COMMAND

CODE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 48. Write Byte Protocol

COMMAND

CODE

DATA BYTE

LOW

7-BIT SLAVE

ADDRESS

DATA BYTE

HIGH

MASTER TO SLAVE

SLAVE TO MASTER

Figure 49. Write Word Protocol

7-BIT SLAVE

ADDRESS

COMMAND

CODE

RDATA BYTE

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

Figure 50. Read Byte Protocol

7-BIT SLAVE

ADDRESS

COMMAND

CODE

7-BIT SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

DATA BYTE

LOW

DATA BYTE

HIGH

Figure 51. Read Word Protocol

7-BIT SLAVE

ADDRESS

COMMAND

CODE

BYTE COUNT =

DATA BYTE 1

DATA BYTE N

MASTER TO SLAVE

SLAVE TO MASTER

Figure 52. Block Write Protocol

7-BIT SLAVE

ADDRESS

7-BIT SLAVE

ADDRESS

COMMAND

CODE

BYTE COUNT =

DATA BYTE 1

MASTER TO SLAVE

SLAVE TO MASTER

DATA BYTE N

Figure 53. Block Read Protocol

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