LTC2978 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978' PDF : 80 Pages View PDF
LTC2978
Operation
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7
11
8
11
S SLAVE ADDRESS Wr A COMMAND CODE A P
x
x
S START CONDITION
Sr REPEATED START CONDITION
Rd READ (BIT VALUE OF 1)
Wr WRITE (BIT VALUE OF 0)
x SHOWN UNDER A FIELD INDICATES THAT THE
FIELD IS REQUIRED TO HAVE THE VALUE OF x
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
2978 F01a
Figure 1a. PMBus Packet Protocol Diagram Element Key
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1
S SLAVE ADDRESS Wr A COMMAND CODE A
8
DATA BYTE
Figure 1b. Write Byte Protocol
11
AP
2978 F01b
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1
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S SLAVE ADDRESS Wr A COMMAND CODE A DATA BYTE LOW A DATA BYTE HIGH A P
2978 F02
Figure 2. Write Word Protocol
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8
1
8
1
8
S SLAVE ADDRESS Wr A COMMAND CODE A DATA BYTE A
PEC
Figure 3. Write Byte Protocol with PEC
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AP
2978 F03
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1
8
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S SLAVE ADDRESS Wr A COMMAND CODE A DATA BYTE LOW A DATA BYTE HIGH A
PEC
AP
2978 F04
Figure 4. Write Word Protocol with PEC
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11
S SLAVE ADDRESS Wr A COMMAND CODE A P
2978 F05
Figure 5. Send Byte Protocol
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8
1
8
S SLAVE ADDRESS Wr A COMMAND CODE A
PEC
Figure 6. Send Byte Protocol with PEC
11
AP
2978 F06
20
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