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PCA9545AD Datasheet(PDF) 7 Page - NXP Semiconductors

Part # PCA9545AD
Description  4-channel I2C-bus switch with interrupt logic and reset
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9545AD Datasheet(HTML) 7 Page - NXP Semiconductors

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PCA9545A_45B_45C_7
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 19 June 2009
7 of 28
NXP Semiconductors
PCA9545A/45B/45C
4-channel I2C-bus switch with interrupt logic and reset
6.2 Control register
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9545A/45B/45C, which will be stored in the control register. If multiple
bytes are received by the PCA9545A/45B/45C, it will save the last byte received. This
register can be written and read via the I2C-bus.
6.2.1 Control register definition
One or several SCx/SDx downstream pair, or channel, is selected by the contents of the
control register. This register is written after the PCA9545A/45B/45C has been
addressed. The 4 LSBs of the control byte are used to determine which channel is to be
selected. When a channel is selected, the channel will become active after a STOP
condition has been placed on the I2C-bus. This ensures that all SCx/SDx lines will be in a
HIGH state when the channel is made active, so that no false conditions are generated at
the time of connection.
Remark: Several channels can be enabled at the same time. Example: B3 = 0, B2 = 1,
B1 = 1, B0 = 0, means that channel 0 and channel 3 are disabled and channel 1 and
channel 2 are enabled. Care should be taken not to exceed the maximum bus capacity.
Fig 8.
Control register
002aab170
INT
3
INT
2
INT
1
INT
0
B3
B2
B1
B0
channel selection bits
(read/write)
76543210
interrupt bits
(read only)
channel 0
channel 1
channel 2
channel 3
INT0
INT1
INT2
INT3
Table 4.
Control register: write (channel selection); read (channel status)
INT3
INT2
INT1
INT0
B3
B2
B1
B0
Command
XXXXXXX
0
channel 0 disabled
1
channel 0 enabled
XXXXXX
0
X
channel 1 disabled
1
channel 1 enabled
XXXXX
0
XX
channel 2 disabled
1
channel 2 enabled
XXXX
0
XXX
channel 3 disabled
1
channel 3 enabled
00000000no channel selected;
power-up/reset default state


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