ADP1055ACPZ-R7 datasheet(48/140 Pages) AD

48 / 140 page

ADP1055

Data Sheet

Rev. A | Page 48 of 140

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 SMBALRT Alert Response Address Protocol.)

All PMBus commands supported by the ADP1055 device follow

one of the protocol types shown in Figure 70 to Figure 77. (For

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

removed.) Figure 70 to Figure 77 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)



NA = no acknowledge bit (1)

Figure 70. Send Protocol with PEC

Figure 71. Write Byte Protocol with PEC

Figure 72. Write Word Protocol with PEC

Figure 73. Read Byte Protocol with PEC

Figure 74. Read Word Protocol with PEC

Figure 75. Block Write Protocol with PEC

Figure 76. Block Read Protocol with PEC

Figure 77. Block Write and Block Read Protocol with PEC

The PMBus slave module of the ADP1055 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.

7-BIT SLAVE

ADDRESS

COMMAND

CODE

PEC

BYTE

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

7-BIT SLAVE

ADDRESS

COMMAND

CODE

DATA

BYTE

PEC

BYTE

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

7-BIT

SLAVE

ADDRESS

COMMAND

CODE

DATA

BYTE

LOW

DATA

BYTE

HIGH

PEC

BYTE

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

7-BIT

SLAVE

ADDRESS

7-BIT

SLAVE

ADDRESS

COMMAND

CODE

PEC

BYTE

DATA

BYTE

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

7-BIT

SLAVE

ADDRESS

7-BIT

SLAVE

ADDRESS

COMMAND

CODE

PEC

BYTE

DATA

BYTE LOW

DATA

BYTE HIGH

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

7-BIT

SLAVE

ADDRESS

BYTE

COUNT = M

. . .

COMMAND

CODE

PEC

BYTE

DATA

BYTE

DATA

BYTE

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

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

. . .

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

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