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CAT24C041JA-45TE13 Datasheet(PDF) 7 Page - Catalyst Semiconductor |
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CAT24C041JA-45TE13 Datasheet(HTML) 7 Page - Catalyst Semiconductor |
7 / 12 page CAT24CXX1/XX2 7 Advanced Doc. No. 25079-00 1/98 M-1 ACKNOWLEDGE 1 START SCL FROM MASTER 89 DATA OUTPUT FROM TRANSMITTER DATA OUTPUT FROM RECEIVER Figure 5. Acknowledge Timing Figure 6. Slave Address Bits FUNCTIONAL DESCRIPTION The CAT24CXXX supports the I2C Bus data transmis- sion protocol. This Inter-Integrated Circuit Bus protocol defines any device that sends data to the bus to be a transmitter and any device receiving data to be a re- ceiver. The transfer is controlled by the Master device which generates the serial clock and all START and STOP conditions for bus access. The CAT24CXXX operates as a Slave device. Both the Master device and Slave device can operate as either transmitter or re- ceiver, but the Master device controls which mode is activated. I2C BUS PROTOCOL 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 CAT24CXXX monitors the SDA and SCL lines and will not respond until this condition is met. 1 010 X X X R/W 1 0 1 0 X X a8 R/W 24C021/022 24C041/042 1 010 X a9 a8 R/W 1 0 1 0 a10 a9 a8 R/W 24C081/082 24C161/162 * 'X' Corresponds to Don't Care Bits (can be a zero or a one) ** a8, a9 and a10 correspond to the address of the memory array address word. 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 Master begins a transmission by sending a START condition. The Master sends the address of the particu- lar slave device it is requesting. The four most significant bits of the 8-bit slave address are fixed as 1010. The next three bits (Fig. 6) define memory addressing. For the 24C021/022, the three bits are don't care. For the 24C041/042, the next two bits are don't care and the third bit is the high order address bit. For the 24C081/ 082, the next bit is don't care and the successive bits define the higher order address bits. For the 24C161/ 162 the three bits define higher order bits. The last bit of the slave address specifies whether a Read or Write operation is to be performed. When this bit is set to 1, a Read operation is selected, and when set to 0, a Write operation is selected. After the Master sends a START condition and the slave address byte, the CAT24CXXX monitors the bus and responds with an acknowledge (on the SDA line) when its address matches the transmitted slave address. The CAT24CXXX then performs a Read or Write operation depending on the state of the R/ W bit. |
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