NXP Semiconductors
PCA9544A
4-channel I2C-bus multiplexer with interrupt logic
7.5 Bus transactions
slave address
control register
SDA S 1 1 1 0 A2 A1 A0 0 A X X X X X B2 B1 B0 A P
START condition
R/W acknowledge
from slave
Fig 12. Write control register
acknowledge
from slave
STOP condition
002aae299
slave address
control register
last byte
SDA S
1
1
1
0 A2 A1 A0 1
A
INT INT INT INT
3210
X
B2 B1 B0 NA
P
START condition
Fig 13. Read control register
R/W acknowledge
from slave
no acknowledge
from master
STOP condition
002aae300
PCA9544A_3
Product data sheet
Rev. 03 — 24 November 2008
© NXP B.V. 2008. All rights reserved.
11 of 27