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CAT24WC16UA-TE13F Datasheet(PDF) 5 Page - Catalyst Semiconductor |
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CAT24WC16UA-TE13F Datasheet(HTML) 5 Page - Catalyst Semiconductor |
5 / 9 page CAT24WC01/02/04/08/16 5 Doc. No. 25051-00 3/98 S-1 using either 24WC01 or 24WC02 device. All three address pins are used for these densities. If only one 24WC02 is addressed on the bus, all three address pins (A0, A1and A2) can be left floating or connected to VSS. If only one 24WC01 is addressed on the bus, all three address pins (A0, A1and A2) must be connected to VSS. A total of four devices can be addressed on a single bus when using 24WC04 device. Only A1 and A2 address pins are used with this device. The A0 address pin is a no connect pin and can be tied to VSS or left floating. If only one 24WC04 is being addressed on the bus, the address pins (A1 and A2) can be left floating or con- nected to VSS. Only two devices can be cascaded when using 24WC08. The only address pin used with this device is A2. The A0 and A1 address pins are no connect pins and can be tied to VSS or left floating. If only one 24WC08 is being addressed on the bus, the address pin (A2) can be left floating or connected to VSS. The 24WC16 is a stand alone device. In this case, all address pins (A0, A1and A2) are no connect pins and can be tied to VSS or left floating. WP: Write Protect If the WP pin is tied to VCC the entire memory array becomes Write Protected (READ only). When the WP pin is tied to VSS or left floating normal read/write opera- tions are allowed to the device. I2C BUS PROTOCOL The following defines the features of the I2C bus proto- col: (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 CAT24WC01/02/04/08/16 monitor 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 then sends the address of the particular slave device it is requesting. The four most significant bits of the 8-bit slave address are fixed as 1010 for the CAT24WC01/02/04/08/16 (see Fig. 5). The next three significant bits (A2, A1, A0) are the device address bits and define which device or which part of the device the Master is accessing. Up to eight CAT24WC01/ 02, four CAT24WC04, two CAT24WC08, and one CAT24WC16 may be individually addressed by the system. 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 CAT24WC01/02/04/08/16 monitors the bus and responds with an acknowledge (on the SDA Figure 4. Acknowledge Timing 5020 FHD F06 ACKNOWLEDGE 1 START SCL FROM MASTER 89 DATA OUTPUT FROM TRANSMITTER DATA OUTPUT FROM RECEIVER |
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