X24C04 Datasheet, PDF (4/18 Pages) Xicor Inc. – Serial E2PROM

X24C04
Stop Condition
All communications must be terminated by a stop condi-
tion, which is a LOW to HIGH transition of SDA when SCL
is HIGH. The stop condition is also used by the X24C04 to
place the device in the standby power mode after a read
sequence. A stop condition can only be issued after the
transmitting device has released the bus.
Acknowledge
Acknowledge is a software convention used to indicate
successful data transfer. The transmitting device, either
master or slave, will release the bus after transmitting eight
bits. During the ninth clock cycle the receiver will
pull the SDA line LOW to acknowledge that it received the
eight bits of data. Refer to Figure 3.
Figure 3. Acknowledge Response From Receiver
The X24C04 will respond with an acknowledge after
recognition of a start condition and its slave address.
If the device and a write operation have been selected, the
X24C04 will respond with an acknowledge after the
receipt of each subsequent eight bit word.
In the read mode the X24C04 will transmit eight bits of data,
release the SDA line and monitor the line for an
acknowledge. If an acknowledge is detected and no stop
condition is generated by the master, the X24C04
will continue to transmit data. If an acknowledge is not
detected, the X24C04 will terminate further data transmissions
The master must then issue a stop condition to return the
X24C04 to the standby power mode and place the device
into a known state.
SCL FROM
MASTER
1
DATA
OUTPUT
FROM
TRANSMITTER
DATA
OUTPUT
FROM
RECEIVER
START
8
9
ACKNOWLEDGE
3839 FHD F08
4