www.ti.com

SDA

SCL

DataLine

Stable;

DataValid

ChangeofData Allowed

DataOutput

byTransmitter

DataOutput

byReceiver

SCL From

Master

START

Condition

ClockPulsefor

Acknowledgement

Not Acknowledge

Acknowledge

SCL

SDA

Acknowledge

Acknowledge

Slave Address

Data

SN75DP129

SLAS583A – JANUARY 2008 – REVISED MARCH 2008

During a read cycle, the slave receiver acknowledges the initial address byte if it decodes the address as its

address. Following this initial acknowledge by the slave, the master device becomes a receiver and

acknowledges data bytes sent by the slave. When the master has received all of the requested data bytes from

the slave, the not acknowledge (A) condition is initiated by the master by keeping the SDA signal high just before

it asserts the stop (P) condition. This sequence terminates a read cycle as shown in Figure 27 and Figure 28.

See the Reading from the SN75DP129, an example section for more information.

18

Submit Documentation Feedback

Copyright © 2008, Texas Instruments Incorporated

Product Folder Link(s): SN75DP129