X24C02

3

Figure 1. Data Validity

SCL

SDA

DATA STABLE

DATA

CHANGE

3838 FHD F06

DEVICE OPERATION

The X24C02 supports a bidirectional bus oriented protocol

The protocol defines any device that sends data onto the

bus as a transmitter and the receiving device as the receiver.

The device controlling the transfer is a master and the

device being controlled is the slave. The master will always

initiate data transfers and provide the clock for both transmit

and receive operations. Therefore, the X24C02 will be

considered a slave in all applications.

Clock and Data Conventions

Data states on the SDA line can change only during SCL

LOW. SDA state changes during SCL HIGH are re-

served for indicating start and stop conditions. Refer to

Figures 1 and 2.

Start Condition

All commands are preceded by the start condition,

which is a HIGH to LOW transition of SDA when SCL is

HIGH. The X24C02 continuously monitors the SDA and SCL

lines for the start condition and will not respond to

any command until this condition has been met.