Philips Semiconductors
4-channel I2C multiplexer and interrupt controller
Product specification
PCA9544
SDA
X XX X X X X XX X XX X XXX
SCL
12 34 5 67 89 1234 5 67 89
SLAVE ADDRESS
CONTROL REGISTER
SDA S 1 1 1 0 A2 A1 A0 0 A INT3 INT2 INT1 INT0 X B2 B1 B0 A P
start condition
R/W acknowledge
from slave
acknowledge
from slave
PREVIOUS CHANNEL
Figure 6. WRITE control register
NEW CHANNEL
tpv
SW00377
SLAVE ADDRESS
CONTROL REGISTER
last byte
SDA S 1 1 1 0 A2 A1 A0 1 A INT3 INT2 INT1 INT0 X B2 B1 B0 NA P
start condition
R/W acknowledge
from slave
Figure 7. READ control register
no acknowledge
from master
stop condition
SW00378
1999 Oct 07
7