pca9548ad NXP Semiconductors, pca9548ad Datasheet - Page 6

• Manufacturer Part Number: pca9548ad
• Description: 8-channel I2c Switch With Reset
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6. Functional description
PCA9548A_2
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 PCA9548A 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.
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9548A, which will be stored in the control register. If multiple bytes are
received by the PCA9548A, it will save the last byte received. This register can be written
and read via the I
Fig 5. Slave address
Fig 6. Control register
Figure 1 “Block diagram of
2
C-bus.
Rev. 02 — 25 September 2006
B7
7
B6
6
1
channel selection bits
B5
5
1
fixed
PCA9548A”.
(read/write)
B4
4
1
B3
3
0
B2
A2
2
selectable
hardware
B1
A1
1
8-channel I
B0
A0 R/W
0
002aab189
Figure
002aab204
channel 0
channel 1
channel 2
channel 3
channel 4
channel 5
channel 6
channel 7
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
5. To conserve power, no
2
C-bus switch with reset
PCA9548A
6 of 25