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AT24C128C-SSHM-T Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT24C128C-SSHM-T Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 22 page 6 Atmel AT24C128C [DATASHEET] 8734B–SEEPR–9/2012 6. 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 Figure 6-1). Data changes during SCL high periods will indicate a start or stop condition as defined below. Figure 6-1. Data Validity Start Condition: A high-to-low transition of SDA with SCL high is a start condition that must precede any other command (See Figure 6-2). Figure 6-2. Start and Stop Definition 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 6-2). Acknowledge: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The EEPROM sends a zero during the ninth clock cycle to acknowledge that it has received each word. Standby Mode: AT24C128C features a low-power standby mode that is enabled upon power-up and after the receipt of the stop bit and the completion of any internal operations. SDA SCL Data Change Data Stable Data Stable SDA SCL Start Stop |
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