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24C01A-IP Datasheet(PDF) 8 Page - Microchip Technology |
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24C01A-IP Datasheet(HTML) 8 Page - Microchip Technology |
8 / 12 page 24C01A/02A/04A DS11183D-page 8 © 1996 Microchip Technology Inc. FIGURE 9-3: SEQUENTIAL READ P BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T O P CONTROL BYTE A C K N O A C K DATA n DATA n + 1 DATA n + 2 DATA n + X A C K A C K A C K 10.0 PIN DESCRIPTION 10.1 A0, A1, A2 Chip Address Inputs The levels on these inputs are compared with the cor- responding bits in the slave address. The chip is selected if the compare is true. For 24C04 A0 is no function. Up to eight 24C01A/02A's or up to four 24C04A's can be connected to the bus. These inputs must be connected to either VSS or VCC. 10.2 SDA Serial Address/Data Input/Output This is a bidirectional pin used to transfer addresses and data into and data out of the device. It is an open drain terminal, therefore the SDA bus requires a pull-up resistor to VCC (typical 10K Ω). For normal data transfer, SDA is allowed to change only during SCL LOW. Changes during SCL HIGH are reserved for indicating the START and STOP condi- tions. 10.3 SCL Serial Clock This input is used to synchronize the data transfer from and to the device. 10.4 WP Write Protection This pin must be connected to either VCC or VSS for 24C02A or 24C04A. It has no effect on 24C01A. If tied to VCC, PROGRAM operations onto the upper memory block will not be executed. Read operations are possible. If tied to VSS, normal memory operation is enabled (read/write the entire memory). This feature allows the user to assign the upper half of the memory as ROM which can be protected against accidental programming. When write is disabled, slave address and word address will be acknowledged but data will not be acknowledged. Note 1: A “page” is defined as the maximum num- ber of bytes that can be programmed in a single write cycle. The 24C04A page is 8 bytes long; the 24C01A/02A page is 2 bytes long. Note 2: A “block” is defined as a continuous area of memory with distinct boundaries. The address pointer can not cross the bound- ary from one block to another. It will how- ever, wrap around from the end of a block to the first location in the same block. The 24C04A has two blocks, 256 bytes each. The 24C01A and 24C02A each have only one block. |
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