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PCA9546APWE4 Datasheet(PDF) 4 Page - Texas Instruments

Part # PCA9546APWE4
Description  4-CHANNEL I2C AND SMBus SWITCH WITH RESET FUNCTION
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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PCA9546APWE4 Datasheet(HTML) 4 Page - Texas Instruments

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Device Address
1
1
1
0
A1
A2
A0
Slave Address
R/W
Fixed
Hardware
Selectable
Control Register
Channel Selection Bits
(Read/Write)
Channel 0
Channel 1
Channel 2
Channel 3
B3
B2
B1
B0
3
2
1
0
X
X
X
X
4
5
6
7
Control Register Definition
PCA9546A
4-CHANNEL I2C AND SMBus SWITCH
WITH RESET FUNCTION
SCPS148E – OCTOBER 2005 – REVISED JANUARY 2008
Following a start condition, the bus master must output the address of the slave it is accessing. The address of
the PCA9546A is shown in Figure 1. To conserve power, no internal pullup resistors are incorporated on the
hardware-selectable address pins, and they must be pulled high or low.
Figure 1. PCA9546A Address
The last bit of the slave address defines the operation to be performed. When set to a logic 1, a read is selected,
while a logic 0 selects a write operation.
Following the successful acknowledgment of the slave address, the bus master sends a byte to the PCA9546A,
which is stored in the control register (see Figure 2). If multiple bytes are received by the PCA9546A, it will save
the last byte received. This register can be written and read via the I2C bus.
Figure 2. Control Register
One or several SCn/SDn downstream pairs, or channels, are selected by the contents of the control register (see
Table 1). This register is written after the PCA9546A has been addressed. The four LSBs of the control byte are
used to determine which channel or channels are to be selected. When a channel is selected, the channel
becomes active after a stop condition has been placed on the I2C bus. This ensures that all SCn/SDn lines are in
a high state when the channel is made active, so that no false conditions are generated at the time of
connection. A stop condition always must occur right after the acknowledge cycle.
4
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Product Folder Link(s): PCA9546A


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