pca9543bpw NXP Semiconductors, pca9543bpw Datasheet - Page 5

• Manufacturer Part Number: pca9543bpw
• Description: Pca9543a/pca9543b/pca9543c 2-channel I2c-bus Switch With Interrupt Logic And Reset
• Manufacturer: NXP Semiconductors

NXP Semiconductors
6. Functional description
PCA9543A_43B_43C_4
Product data sheet
6.1 Device address
6.2 Control register
Refer to
Following a START condition, the bus master must output the address of the slave it is
accessing. The address of the PCA9543A is shown in
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
The last bit of the slave address defines the operation to be performed. When set to
logic 1 a read is selected, while a logic 0 selects a write operation.
The PCA9543B and PCA9543C are alternate address versions if needed for larger
systems or to resolve address conflicts. The data sheet will reference the PCA9543A, but
the PCA9543B and PCA9543C function identically except for the slave address.
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9543A, which will be stored in the control register. If multiple bytes are
received by the PCA9543A, it will save the last byte received. This register can be written
and read via the I
Fig 4. Slave address PCA9543A
Fig 5. Slave address PCA9543B
Fig 7. Control register
1
Figure 1 “Block diagram of
1
fixed
1
2
C-bus.
1
Rev. 04 — 20 October 2006
0
selectable
hardware
X
7
A1
interrupt bits
(read only)
X
6
1
A0 R/W
2-channel I
002aab799
INT
5
1
1
PCA9543A/43B/43C”.
fixed
INT
4
0
1
3
X
0
2
channel selection bits
(read/write)
C-bus switch with interrupt logic and reset
X
2
0
Fig 6. Slave address PCA9543C
PCA9543A/43B/43C
selectable
hardware
B1
A1
1
B0
0
A0 R/W
002aab169
0
Figure
1
002aab181
channel 0
channel 1
INT0
INT1
fixed
1
4. To conserve power, no
0
0
selectable
© NXP B.V. 2006. All rights reserved.
hardware
A1
A0 R/W
002aab800
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