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TCA6424 Datasheet(PDF) 6 Page - Texas Instruments |
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TCA6424 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 29 page S 1 2 8 9 NACK ACK DataOutput byTransmitter DataOutput byReceiver SCL From Master Start Condition ClockPulsefor Acknowledgment 0 Slave Address 1 0 0 0 1 AD DR R/W Fixed Programmable TCA6424 SCPS175A – NOVEMBER 2007 – REVISED NOVEMBER 2009 www.ti.com Figure 3. Acknowledgment on the I2C Bus Table 3. Interface Definition BIT BYTE 7 (MSB) 6 5 4 3 2 1 0 (LSB) I2C slave address L H L L L H ADDR R/W P07 P06 P05 P04 P03 P02 P01 P00 I/O data bus P17 P16 P15 P14 P13 P12 P11 P10 P27 P26 P25 P24 P23 P22 P21 P20 Device Address The address of the TCA6424 is shown in Figure 4. Figure 4. TCA6424 Address Table 4. Address Reference ADDR I2C BUS SLAVE ADDRESS L 34 (decimal), 22 (hexadecimal) H 35 (decimal), 23 (hexadecimal) The last bit of the slave address defines the operation (read or write) to be performed. A high (1) selects a read operation, while a low (0) selects a write operation. Control Register and Command Byte Following the successful acknowledgment of the address byte, the bus master sends a command byte, which is stored in the control register in the TCA6424. Four bits of this data byte state the operation (read or write) and the internal registers (input, output, polarity inversion, or configuration) that will be affected. The control register can be written or read through the I2C bus. The command byte is sent only during a write transmission. 6 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Link(s): TCA6424 |
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