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PCA9546APWRE4 Datasheet(PDF) 7 Page - Texas Instruments

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Part # PCA9546APWRE4
Description  4-CHANNEL I2C AND SMBus SWITCH WITH RESET FUNCTION
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCA9546APWRE4 Datasheet(HTML) 7 Page - Texas Instruments

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Data Output
by Transmitter
SCL From
Master
Start
Condition
S
1
2
8
9
Data Output
by Receiver
Clock Pulse for ACK
NACK
ACK
A
A
S
1
1
1
0
A2 A1
A0
0
Start Condition
SDA
R/W
ACK From Slave
ACK From Slave
P
B0
B1
B2
B3
X
X
X
X
Stop Condition
Slave Address
Control Register
A
NA
S
1
1
1
0
A2 A1
A0
1
SDA
P
B3 B2
B1 B0
Start Condition
R/W
ACK From Slave
NACK From Master
Stop Condition
Slave Address
Control Register
0
0
0
0
PCA9546A
4-CHANNEL I2C AND SMBus SWITCH
WITH RESET FUNCTION
SCPS148E – OCTOBER 2005 – REVISED JANUARY 2008
When a slave receiver is addressed, it must generate an ACK after the reception of each byte. Also, a master
must generate an ACK after the reception of each byte that has been clocked out of the slave transmitter. The
device that acknowledges must pull down the SDA line during the ACK clock pulse so that the SDA line is stable
low during the high pulse of the ACK-related clock period (see Figure 7). Setup and hold times must be taken
into account.
Figure 7. Acknowledgment on the I2C Bus
Data is transmitted to the PCA9546A control register using the write mode shown in Figure 8.
Figure 8. Write Control Register
Data is read from the PCA9546A control register using the read mode shown in Figure 9.
Figure 9. Read Control Register
Copyright © 2005–2008, Texas Instruments Incorporated
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Product Folder Link(s): PCA9546A


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