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TCA6408PWR Datasheet(PDF) 7 Page - Texas Instruments

No. de pieza TCA6408PWR
Descripción Electrónicos  LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
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SDA
SCL
S
P
StartCondition
StopCondition
SDA
SCL
DataLine
Change
S
1
2
8
9
NACK
ACK
DataOutput
byTransmitter
DataOutput
byReceiver
SCL From
Master
Start
Condition
ClockPulsefor
Acknowledgment
TCA6408
LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS151C – FEBRUARY 2007 – REVISED JUNE 2007
A stop condition, a low-to-high transition on the SDA input/output while the SCL input is high, is sent by the
master (see Figure 1).
Any number of data bytes can be transferred from the transmitter to receiver between the start and the stop
conditions. Each byte of eight bits is followed by one ACK bit. The transmitter must release the SDA line before
the receiver can send an ACK bit. 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 3). When a slave receiver is addressed, it must generate an ACK after each byte is received. Similarly,
the master must generate an ACK after each byte that it receives from the slave transmitter. Setup and hold
times must be met to ensure proper operation.
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
7
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