X24012
DEVICE OPERATION
Clock and Data Conventions
Data states on the SDA line can change only during SCL
LOW. SDA state changes during SCL HIGH are
The X24012 supports a bidirectional bus oriented proto- col.
The protocol defines any device that sends data
reserved for indicating start and stop conditions. Refer to
Figures 1 and 2.
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
Start Condition
All commands are preceded by the start condition,
which is a HIGH to LOW transition of SDA when SCL is
clock for both transmit and receive operations. Therefore, the
X24012 will be considered a slave in all
HIGH. The X24012 continuously monitors the SDA and SCL
lines for the start condition and will not respond to
any command until this condition has been met.
applications.
Figure 1. Data Validity
SCL
SDA
DATA
CHANGE
DATA STABLE
3847 FHD F05
Figure 2. Definition of Start and Stop
SCL
SDA
3847 FHD F06
START BIT
STOP BIT
3
ICMIC [ IC MICROSYSTEMS ]
