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OPERATION
FIGURE 7 TO FIGURE 24 PMBus PROTOCOLS
1
S
SLAVE ADDRESS
S
START CONDITION
Sr
REPEATED START CONDITION
Rd
READ (BIT VALUE OF 1)
Wr
WRITE (BIT VALUE OF 0)
A
ACKNOWLEDGE (THIS BIT POSITION MAY BE 0
FOR AN ACK OR 1 FOR A NACK)
P
STOP CONDITION
PEC PACKET ERROR CODE
MASTER TO SLAVE
SLAVE TO MASTER
...
CONTINUATION OF PROTOCOL
Figure 7. PMBus Packet Protocol Diagram Element Key
1
S
SLAVE ADDRESS Rd/Wr A
Figure 8. Quick Command Protocol
1
7
S
SLAVE ADDRESS
Figure 9. Send Byte Protocol
1
7
1
S
SLAVE ADDRESS
Wr A
Figure 10. Send Byte Protocol with PEC
1
7
1
S
SLAVE ADDRESS
Wr A
Figure 11. Write Byte Protocol
1
7
1
1
S
SLAVE ADDRESS
Wr A
COMMAND CODE
Figure 12. Write Byte Protocol with PEC
1
7
1
1
S
SLAVE ADDRESS
Wr A
COMMAND CODE
Figure 13. Write Word Protocol
7
1
1
8
Wr A
COMMAND CODE
Figure 14. Write Word Protocol with PEC
For more information
4681 F07
7
1
1
1
P
4681 F08
1
1
8
1
1
Wr A
COMMAND CODE
A
P
4681 F09
1
8
1
8
COMMAND CODE
A
PEC
1
8
1
8
COMMAND CODE
A
DATA BYTE
8
1
8
1
A
DATA BYTE
A
8
1
8
1
A
DATA BYTE LOW
A
DATA BYTE HIGH
1
8
1
8
A
DATA BYTE LOW
A
DATA BYTE HIGH
www.analog.com
LTM4681
1
1
A
P
4681 F10
1
1
A
P
4681 F11
8
1
1
PEC
A
P
4681 F12
8
1
1
A
P
4681 F13
1
8
1
1
A
PEC
A
P
4681 F14
Rev. A
47
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