max5945caxt Maxim Integrated Products, Inc., max5945caxt Datasheet - Page 19
max5945caxt
Manufacturer Part Number
max5945caxt
Description
Max5945 Quad Network Power Controller For Power-over-lan
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX5945CAXT.pdf
(44 pages)
- Current page: 19 of 44
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Figure 5. 2-Wire Serial Interface Timing Details
Figure 6. 3-Wire Serial Interface Timing Details
Figure 7. Start and Stop Conditions
Both SCL and SDA remain high when the interface is
not busy. A master signals the beginning of a transmis-
sion with a START (S) condition by transitioning SDA
from high to low while SCL is high. When the master fin-
SDAIN
SDA/
SCL
SDAIN/SDA
SDAIN
SCL
START
SCL
S
t
HD, STA
t
HD, STA
START CONDITION
START CONDITION
______________________________________________________________________________________
t
LOW
t
LOW
Start and Stop Conditions
t
R
t
R
t
HIGH
t
HIGH
t
SU, DAT
t
SU, DAT
t
F
t
F
Quad Network Power Controller
t
HD, DAT
t
HD, DAT
STOP
P
t
SU, STA
REPEATED START CONDITION
t
SU, STA
REPEATED START CONDITION
ishes communicating with the slave, the master issues
a STOP (P) condition by transitioning SDA from low to
high while SCL is high. The stop condition frees the bus
for another transmission.
Figure 8. Bit Transfer
SDA
SCL
for Power-Over-LAN
t
HD, STA
t
DATA LINE STABLE;
HD, STA
DATA VALID
DATA ALLOWED
CHANGE OF
t
SU, STO
t
SU, STO
CONDITION
CONDITION
STOP
STOP
t
BUF
t
BUF
CONDITION
CONDITION
START
START
19
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