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Integral multiples of two bytes
SCL
SDA
1
0
2
3
4
5
6
7
8
slave address (PCF8575)
data to port 0
data to port 1
S
1
0
0
A2 A1 A0
0
A
P07 P06
1
P00
A
P17
P10
A
acknowledge
from slave
start condition
acknowledge P05
from slave
acknowledge
from slave
R/W
WRITE TO
PORT
Data A0 and
B0 valid
DATA OUTPUT
FROM PORT
t
pv
P05 OUTPUT
VOLTAGE
I
P05 PULL-UP
OUTPUT CURRENT
OHt
I
OH
INT
t
MGL542
ir
Fig.9 WRITE mode (output).
NXP [ NXP ]
