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K24C64-S-ER-A Datasheet(PDF) 4 Page - Estek Electronics Co. Ltd |
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K24C64-S-ER-A Datasheet(HTML) 4 Page - Estek Electronics Co. Ltd |
4 / 12 page P R 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 24C32/ 24C64 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. ¡Figure 1: Data Validity ¡Figure 2: Start and Stop Definition SDA SCL START STOP SDA SCL DATA CHANGE DATA STABLE DATA STABLE 4 24C32 / 24C64 BEIJING ESTEK ELECTRONICS CO.,LTD |
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