Rainbow-electronics MAX5945 Manual do Utilizador descarregar pdf (Página 19)

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-

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.

MAX5945

Quad Network Power Controller

for Power-Over-LAN

______________________________________________________________________________________ 19

Figure 5. 2-Wire Serial Interface Timing Details

SCL

SDAIN

LOW

HIGH

BUF

START

CONDITION

STOP

CONDITION

REPEATED START CONDITION

START CONDITION

HD, STA

SU, DAT

HD, DAT

SU, STA

HD, STA

SU, STO

Figure 6. 3-Wire Serial Interface Timing Details

SCL

SDAIN/SDA

LOW

HIGH

BUF

START

CONDITION

STOP

CONDITION

REPEATED START CONDITION

START CONDITION

HD, STA

SU, DAT

HD, DAT

SU, STA

HD, STA

SU, STO

Figure 8. Bit Transfer

SDA

SCL

DATA LINE STABLE;

DATA VALID

CHANGE OF

DATA ALLOWED

Figure 7. Start and Stop Conditions

START STOP

SDA/

SDAIN

SCL

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 43 44

Quad Network Power Controller 1

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