Datasheet

LTC2977
20
2977fa
For more information www.linear.com/LTC2977
OPERATION
Figure 10. Read Byte Protocol with PEC
2977 F11
SLAVE ADDRESS COMMAND CODE SrWr A AS
7 8 7 11
BYTE COUNT = N
8 1
...
1 1 11
A A
1
SLAVE ADDRESS Rd
DATA BYTE 1 DATA BYTE 2A A
...
...
8 8 8 11
1
1 1
A
DATA BYTE N P
2977 F12
SLAVE ADDRESS COMMAND CODE SrWr A AS
7 8 7 11
BYTE COUNT = N
8 1
...
1 1 11
A A
1
SLAVE ADDRESS Rd
DATA BYTE 1 DATA BYTE 2A A
...
...
8 8 8 8 1 11
1
1 1
A A P
DATA BYTE N PEC
Figure 11. Block Read
Figure 12. Block Read with PEC
SLAVE ADDRESS COMMAND CODE SLAVE ADDRESSWr A A A P
2977
F07
S
7 8 7 1
DATA BYTE LOW
8
DATA BYTE HIGH
811 1 1
Sr
1 1
1
11
A
1
Rd A
SLAVE ADDRESS COMMAND CODE SLAVE ADDRESSWr A A A PA
2977
F08
S
7 8 7 1
DATA BYTE LOW
8
DATA BYTE HIGH PEC
8 811 1 1 1
1
111
Sr
1
A
1
Rd A
Figure 7. Read Word Protocol
Figure 8. Read Word Protocol with PEC
Figure 9. Read Byte Protocol
SLAVE ADDRESS COMMAND CODE SLAVE ADDRESSWr A A Sr P
2977
F09
S
7 8 7 11
DATA BYTE
8 1
1
1 1 1 11 1
ARd A
SLAVE ADDRESS COMMAND CODE SLAVE ADDRESSWr A A Sr P
2977
F10
S
7 8 7 11
DATA BYTE
8 1
1
1 1 1 11 1
ARd A
1
A PEC