ADM1275-3ACPZ-R7 datasheet(28/48 Pages) AD

28 / 48 page

ADM1275

Data Sheet

Rev. D | Page 28 of 48

SMBus MESSAGE FORMATS

Figure 58 to Figure 65 show all the SMBus protocols supported

by the ADM1275, along with the PEC variant. In these figures,

unshaded cells indicate that the bus host is actively driving the

bus; shaded cells indicate that the ADM1275 is driving the bus.

Figure 58 to Figure 65 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.

SLAVE ADDRESS

DATA BYTE

SLAVE ADDRESS

DATA BYTE

PEC

MASTER TO SLAVE

SLAVE TO MASTER

Figure 58. Send Byte and Send Byte with PEC

SLAVE ADDRESS

DATA BYTE

SLAVE ADDRESS

DATA BYTE

PEC

MASTER TO SLAVE

SLAVE TO MASTER

Figure 59. Receive Byte and Receive Byte with PEC

SLAVE ADDRESS

COMMAND CODE

DATA BYTE

SLAVE ADDRESS

COMMAND CODE

DATA BYTE

APEC

MASTER TO SLAVE

SLAVE TO MASTER

Figure 60. Write Byte and Write Byte with PEC

SLAVE ADDRESS

DATA BYTE

SLAVE ADDRESS

COMMAND CODE

PEC

SLAVE ADDRESS

COMMAND CODE

SLAVE ADDRESS

RDATA BYTE

MASTER TO SLAVE

SLAVE TO MASTER

Figure 61. Read Byte and Read Byte with PEC

SLAVE ADDRESS

COMMAND CODE

DATA BYTE LOW

SLAVE ADDRESS

COMMAND CODE

DATA BYTE LOW

ADATA BYTE HIGH

DATA BYTE HIGH

PEC

MASTER TO SLAVE

SLAVE TO MASTER

Figure 62. Write Word and Write Word with PEC

SLAVE ADDRESS

COMMAND CODE

DATA BYTE LOW

DATA BYTE HIGH

SLAVE ADDRESS

COMMAND CODE

DATA BYTE LOW

DATA BYTE HIGH

PEC

MASTER TO SLAVE

SLAVE TO MASTER

Figure 63. Read Word and Read Word with PEC

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