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CAT24WC257J-1.8TE13 Scheda tecnica(PDF) 5 Page - Catalyst Semiconductor |
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CAT24WC257J-1.8TE13 Scheda tecnica(HTML) 5 Page - Catalyst Semiconductor |
5 / 10 page CAT24WC257 5 Doc. No. 1030, Rev. E The features of the I2C bus protocol are defined as follows: (1) Data transfer may be initiated only when the bus is not busy. (2) During a data transfer, the data line must remain stable whenever the clock line is high. Any changes in the data line while the clock line is high will be interpreted as a START or STOP condition. START Condition The START Condition precedes all commands to the device, and is defined as a HIGH to LOW transition of SDA when SCL is HIGH. The CAT24WC257 monitors the SDA and SCL lines and will not respond until this condition is met. STOP Condition A LOW to HIGH transition of SDA when SCL is HIGH determines the STOP condition. All operations must end with a STOP condition. DEVICE ADDRESSING The bus Master begins a transmission by sending a START condition. The Master sends the address of the particular slave device it is requesting. The five most significant bits of the 8-bit slave address are fixed as 10100(Fig. 5). The CAT24WC257 uses the next two bits as address bits. The address bits A1 and A0 allow as Figure 4. Acknowledge Timing Figure 5. Slave Address Bits many as four devices on the same bus. These bits must compare to their hardwired input pins. The last bit of the slave address specifies whether a Read or Write opera- tion is to be performed. When this bit is set to 1, a Read operation is selected, and when set to 0, a Write opera- tion is selected. After the Master sends a START condition and the slave address byte, the CAT24WC257 monitors the bus and responds with an acknowledge (on the SDA line) when its address matches the transmitted slave address. The CAT24WC257 then performs a Read or Write operation depending on the state of the R/W bit. Acknowledge After a successful data transfer, each receiving device is required to generate an acknowledge. The Acknowledg- ing device pulls down the SDA line during the ninth clock cycle, signaling that it received the 8 bits of data. The CAT24WC257 responds with an acknowledge after receiving a START condition and its slave address. If the device has been selected along with a write operation, it responds with an acknowledge after receiving each 8- bit byte. When the CAT24WC257 begins a READ mode it trans- mits 8 bits of data, releases the SDA line, and monitors the line for an acknowledge. Once it receives this ac- knowledge, the CAT24WC257 will continue to transmit data. If no acknowledge is sent by the Master, the device I2C BUS PROTOCOL ACKNOWLEDGE 1 START SCL FROM MASTER 89 DATA OUTPUT FROM TRANSMITTER DATA OUTPUT FROM RECEIVER 1 0100 A1 A0 R/W |
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