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24AA025 Datasheet(PDF) 7 Page - Microchip Technology |
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24AA025 Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 26 page  © 2007 Microchip Technology Inc. DS21210K-page 7 24AA024/24LC024/24AA025/24LC025 5.0 DEVICE ADDRESSING A control byte is the first byte received following the Start condition from the master device (Figure 5-1). The control byte consists of a four-bit control code. For the 24AA024/24LC024/24AA025/24LC025, this is set as ‘1010’ binary for read and write operations. The next three bits of the control byte are the Chip Select bits (A2, A1, A0). The Chip Select bits allow the use of up to eight 24AA024/24LC024/24AA025/24LC025 devices on the same bus and are used to select which device is accessed. The Chip Select bits in the control byte must correspond to the logic levels on the corre- sponding A2, A1 and A0 pins for the device to respond. These bits are in effect the three Most Significant bits of the word address. The last bit of the control byte defines the operation to be performed. When set to a one, a read operation is selected. When set to a zero, a write operation is selected. Following the Start condition, the 24AA024/ 24LC024/24AA025/24LC025 monitors the SDA bus checking the control byte being transmitted. Upon receiving a ‘1010’ code and appropriate Chip Select bits, the slave device outputs an Acknowledge signal on the SDA line. Depending on the state of the R/W bit, the 24AA024/24LC024/24AA025/24LC025 will select a read or write operation. FIGURE 5-1: CONTROL BYTE FORMAT 5.1 Contiguous Addressing Across Multiple Devices The Chip Select bits A2, A1 and A0 can be used to expand the contiguous address space for up to 16K bits by adding up to eight 24AA024/24LC024/24AA025/ 24LC025 devices on the same bus. In this case, soft- ware can use A0 of the control byte as address bit A8, A1 as address bit A9 and A2 as address bit A10. It is not possible to sequentially read across device boundaries. 10 1 0 A2 A1 A0 SACK R/W Control Code Chip Select Bits Slave Address Acknowledge Bit Start Bit Read/Write Bit |
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