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X4045PZ-4.5A Datasheet(PDF) 10 Page - Intersil Corporation |
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X4045PZ-4.5A Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 24 page 10 FN8118.1 September 30, 2005 SERIAL INTERFACE Serial Interface Conventions The device 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 called the master and the device being controlled is called the slave. The master always initiates data transfers, and provides the clock for both transmit and receive operations. Therefore, the devices in this fam- ily operate as slaves in all applications. Serial Clock and Data Data states on the SDA line can change only during SCL LOW. SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. See Figure 6. Figure 6. Valid Data Changes on the SDA Bus 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 7. 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 6. Figure 7. Valid Start and Stop Conditions Serial Acknowledge Acknowledge is a software convention used to indi- cate successful data transfer. The transmitting device, either master or slave, will release the bus after trans- mitting 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 8. 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. 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. SCL SDA Data Stable Data Change Data Stable SCL SDA Start Stop X4043, X4045 |
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