PCA9542A 데이터 시트보기 (PDF) - NXP Semiconductors.
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PCA9542A Datasheet PDF : 22 Pages
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NXP Semiconductors
PCA9542A
2-channel I2C-bus multiplexer and 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 11. 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
X
X
INT INT
10
X
B2 B1 B0 NA
P
START condition
Fig 12. Read control register
R/W acknowledge
from slave
no acknowledge
from master
STOP condition
002aae305
8. Application design-in information
PCA9542A_3
Product data sheet
VDD = 2.7 V to 5.5 V
SDA
SCL
I2C-bus/SMBus master
VDD = 3.3 V
SDA
SCL
INT
SD0
SC0
INT0
PCA9542A
A2
A1
SD1
A0
SC1
VSS
INT1
002aae306
V = 2.7 V to 5.5 V
(1)
channel 0
V = 2.7 V to 5.5 V
(1)
channel 1
(1) If the device generating the interrupt has an open-drain output structure or can be 3-stated,
a pull-up resistor is required.
If the device generating the interrupt has a totem pole output structure and cannot be 3-stated,
a pull-up resistor is not required.
The interrupt inputs should not be left floating.
Fig 13. Typical application
Rev. 03 — 24 November 2008
© NXP B.V. 2008. All rights reserved.
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