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X24042P-2.7 Datasheet(PDF) 3 Page - Xicor Inc. |
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X24042P-2.7 Datasheet(HTML) 3 Page - Xicor Inc. |
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3 / 15 page  X24042 3 DEVICE OPERATION The X24042 supports a bidirectional bus oriented proto- col. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device controlling the transfer is a master and the device being controlled is the slave. The master will always initiate data transfers, and provide the clock for both transmit and receive operations. Therefore, the X24042 will be considered a slave in all applications. Clock and Data Conventions Data states on the SDA line can change only during SCL LOW. SDA state changes during SCL HIGH are re- served for indicating start and stop conditions. Refer to Figures 1 and 2. Start Condition All commands are preceded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. The X24042 continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition has been met. Stop Condition All communications must be terminated by a stop con- dition, which is a LOW to HIGH transition of SDA when SCL is HIGH. The stop condition is also used by the X24042 to place the device into the standby power mode after a read sequence. A stop condition can only be issued after the transmitting device has released the bus. Figure 1. Data Validity SCL SDA DATA STABLE DATA CHANGE 3849 FHD F06 Figure 2. Definition of Start and Stop SCL SDA START BIT STOP BIT 3849 FHD F07 |
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