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TCA9539RTWR Datasheet(PDF) 8 Page - Texas Instruments |
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TCA9539RTWR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 32 page Device Address 1 1 1 0 A1 A0 Slave Address R/W Fixed Programmable 1 Control Register and Command Byte 0 0 0 B2 B1 B0 0 0 TCA9539 SCPS202A – AUGUST 2009 – REVISED SEPTEMBER 2009........................................................................................................................................... www.ti.com Figure 4 shows the address byte of the TCA9539. Figure 4. TCA9539 Address Address Reference INPUTS I2C BUS SLAVE ADDRESS A1 A0 L L 116 (decimal), 74 (hexadecimal) L H 117 (decimal), 75 (hexadecimal) H L 118 (decimal), 76 (hexadecimal) H H 119 (decimal), 77 (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. Following the successful acknowledgment of the address byte, the bus master sends a command byte that is stored in the control register in the TCA9539. Three bits of this data byte state the operation (read or write) and the internal register (input, output, Polarity Inversion or Configuration) that will be affected. This register can be written or read through the I2C bus. The command byte is sent only during a write transmission. Once a command byte has been sent, the register that was addressed continues to be accessed by reads until a new command byte has been sent. Figure 5. Control Register Bits Command Byte CONTROL REGISTER BITS COMMAND POWER-UP REGISTER PROTOCOL BYTE (HEX) DEFAULT B2 B1 B0 0 0 0 0x00 Input Port 0 Read byte xxxx xxxx 0 0 1 0x01 Input Port 1 Read byte xxxx xxxx 0 1 0 0x02 Output Port 0 Read/write byte 1111 1111 0 1 1 0x03 Output Port 1 Read/write byte 1111 1111 1 0 0 0x04 Polarity Inversion Port 0 Read/write byte 0000 0000 1 0 1 0x05 Polarity Inversion Port 1 Read/write byte 0000 0000 1 1 0 0x06 Configuration Port 0 Read/write byte 1111 1111 1 1 1 0x07 Configuration Port 1 Read/write byte 1111 1111 8 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TCA9539 |
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