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 ). Data changes during SCL

high periods will indicate a start or stop condition as define d 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 ).

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 s tandby power mode (see Figure 2 ).

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

bit words. The EEPROM sen ds a "0" to acknowledge that it has received each word. This happens during

the ninth clock cycle.

STANDBY MODE: The

LR24C02 features a low-power standby mode which is

power-up and (b) after the recei pt 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 cycle s.

2.

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

3.

Create a start cond ition.

Figure 1: Data Validity

Figure 2: Start and Stop Definition

V2.1

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