O M

Device Operation

CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an external device. Data on the SDA

pin may change only during SCL low time periods (see to Figure 1 on page 4). Data changes during SCL high periods

will indicate a start or stop condition as defined below.

START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which must precede any other

command (see to Figure 2 on page 4).

STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition. After a read sequence, the stop

command will place the EEPROM in a standby power mode (see Figure 2 on page 4).

ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The

EEPROM sends a "0" to acknowledge that it has received each word. This happens during the ninth clock cycle.

STANDBY MODE: The 24C02/ 24C04/ 24C08/ 24C16 features a low-power standby mode which is enabled: (a)

upon power-up and (b) after the receipt of the STOP bit and the completion of any internal operations

MEMORY RESET: After an interruption in protocol, power loss or system reset, any two-wire part can be reset by

following these steps:

1.

Clock up to 9 cycles.

2.

Look for SDA high in each cycle while SCL is high.

3.

Create a start condition.

SDA

SCL

START

STOP

SDA

SCL

DATA

CHANGE

DATA STABLE

DATA STABLE

4

BEIJING ESTEK ELECTRONICS CO.,LTD

24C02 / 24C04 / 24C08 / 24C16