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PCA6107 Datasheet(PDF) 6 Page - Texas Instruments

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Part No. PCA6107
Description  REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

PCA6107 Datasheet(HTML) 6 Page - Texas Instruments

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SDA
SCL
S
P
Start Condition
Stop Condition
SDA
SCL
Data Line
Change
Data Output
by Transmitter
SCL From
Master
Start
Condition
S
1
2
8
9
Data Output
by Receiver
Clock Pulse for
Acknowledgment
NACK
ACK
PCA6107
REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS139B – JANUARY 2006 – REVISED OCTOBER 2006
A master receiver signals an end of data to the slave transmitter by not generating an acknowledge (NACK)
after the last byte has been clocked out of the slave. This is done by the master receiver by holding the SDA line
high. In this event, the transmitter must release the data line to enable the master to generate a Stop condition.
Figure 1. Definition of Start and Stop Conditions
Figure 2. Bit Transfer
Figure 3. Acknowledgment on the I2C Bus
Interface Definition
BIT
BYTE
7 (MSB)
6
5
4
3
2
1
0 (LSB)
I2C slave address
L
L
H
H
A2
A1
A0
R/W
Px I/O data bus
P7
P6
P5
P4
P3
P2
P1
P0
6
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