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X4C105 Datasheet(PDF) 4 Page - Intersil Corporation |
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X4C105 Datasheet(HTML) 4 Page - Intersil Corporation |
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4 / 19 page  4 FN8124.0 March 18, 2005 Serial Start Condition All commands are preceded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. The device continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition has been met. See Figure 3. Serial 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 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. See Figure 2. Serial Acknowledge Acknowledge is a software convention used to indicate successful data transfer. The transmitting device, either master or slave, will release the bus after transmitting eight bits. During the ninth clock cycle, the receiver will pull the SDA line LOW to acknowledge that it received the eight bits of data. Refer to Figure 4. The device will respond with an acknowledge after recognition of a start condition and if the correct device identifier and select bits are contained in the slave address byte. If a write operation is selected, the device will respond with an acknowledge after the receipt of each subsequent eight bit word. The device will acknowledge all incoming data and address bytes, except for the slave address byte when the device identifier and/or select bits are incorrect or when the device is busy, such as during a nonvolatile write. In the read mode, the device will transmit eight bits of data, release the SDA line, then monitor the line for an acknowledge. If an acknowledge is detected and no stop condition is generated by the master, the device will continue to transmit data. The device will terminate further data transmissions if an acknowledge is not detected. The master must then issue a stop condition to return the device to standby mode and place the device into a known state. Figure 3. Valid Start and Stop Conditions Figure 4. Acknowledge Response From Receiver SCL SDA Start Stop SCL from Master Data Output from Data Output from Receiver 8 1 9 Start Acknowledge X4C105 |
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