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SFP Laser Controller and
Diagnostic IC
COMMUNICATIONS KEY
S
START
A
ACK
WHITE BOXES INDICATE THE MASTER IS
CONTROLLING SDA
NOTE:
ALL BYTES ARE SENT MOST SIGNIFICANT BIT FIRST.
P
STOP
N
NOT
ACK
SHADED BOXES INDICATE THE SLAVE IS
CONTROLLING SDA
THE FIRST BYTE SENT AFTER A START CONDITION IS
ALWAYS THE SLAVE ADDRESS FOLLOWED BY THE
SR
REPEATED
START
X
X
X
X
X
X
X
X
8-BITS ADDRESS OR DATA
READ/WRITE BIT.
WRITE A SINGLE BYTE TO 2-WIRE ADDRESS A0h
S
1 0
1
0 0
0
0
0
A
MEMORY ADDRESS
A
DATA
A
P
WRITE UP TO A 8-BYTE PAGE WITH A SINGLE TRANSACTION I 2 C ADDRESS A2h
S
1 0
1
0 0
0
1
0
A
MEMORY ADDRESS
A
DATA
A
DATA
A
P
READ A SINGLE BYTE WITH A DUMMY WRITE CYCLE TO SET THE ADDRESS COUNTER FROM I 2 C ADDRESS A0h
S
1 0
1
0 0
0
0
0
A
MEMORY ADDRESS
A
SR
1 0
1
0 0
0
0
1
A
DATA
N
P
READ MULTIPLE BYTES WITH A DUMMY WRITE CYCLE TO SET THE ADDRESS COUNTER FROM I 2 C ADDRESS A2h
S
1 0
1
0 0
0
1
0
A
MEMORY ADDRESS
A
SR
1 0
1
0 0
0
1
1
A
DATA
A
DATA
A
DATA
A
DATA
N
P
Figure 20. I 2 C Communications Examples
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