Data Output

by Transmitter

SCL From

Master

Start

Condition

S

1

2

8

9

Data Output

by Receiver

Clock Pulse for

Acknowledgment

NACK

ACK

SDA

SCL

Data Line

Stable;

Data Valid

Change

of Data

Allowed

SDA

SCL

Start Condition

S

Stop Condition

P

TCA9548A

SCPS207A – MAY 2012 – REVISED JULY 2012

www.ti.com

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

Device Address

Figure 4 shows the address byte of the TCA9548A.

4

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