SFP Laser Controller and
Diagnostic IC
SDA
MSB
SLAVE ADDRESS
R/W
DIRECTION
ACKNOWLEDGEMENT
SIGNAL FROM RECEIVER
BIT
ACKNOWLEDGEMENT
SIGNAL FROM RECEIVER
SCL
1
2
6
7
8
9
1
2
3–7
8
9
START
ACK
ACK
STOP
CONDITION
REPEATED IF MORE BYTES
ARE TRANSFERRED
CONDITION
OR REPEATED
START
CONDITION
Figure 18. I 2 C Data Transfer Protocol
SDA
t BUF
t HD:STA
t SP
SCL
t LOW
t R
t F
t HD:STA
t HIGH
t SU:STA
STOP
START
t SU:DAT
REPEATED
START
t SU:STO
t HD:DAT
Figure 19. I 2 C AC Characteristics
for SCL. Pullup resistor values should be chosen to
ensure that the rise and fall times listed in the AC
Electrical Characteristics table are within specification.
70
____________________________________________________________________
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