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TCA6408RGTRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TCA6408RGTRG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 31 page www.ti.com Device Address 0 Slave Address 0 1 0 0 AD DR R/W Fixed Programmable 0 Control Register and Command Byte B2 B1 B0 B5 B4 B3 B7 B6 TCA6408 LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS SCPS151C – FEBRUARY 2007 – REVISED JUNE 2007 Interface Definition BIT BYTE 7 (MSB) 6 5 4 3 2 1 0 (LSB) I2C slave address L H L L L L ADDR R/W I/O data bus P7 P6 P5 P4 P3 P2 P1 P0 The address of the TCA6408 is shown in Figure 4. Figure 4. TCA6408 Address Address Reference ADDR I2C BUS SLAVE ADDRESS L 32 (decimal), 20 (hexadecimal) H 33 (decimal), 21 (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 acknowledgement of the address byte, the bus master sends a command byte, which is stored in the control register in the TCA6408. Two 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. This register can be written or read through the I2C bus. The command byte is sent only during a write transmission. Figure 5. Control Register Bits Command Byte CONTROL REGISTER BITS COMMAND POWER-UP BYTE REGISTER PROTOCOL DEFAULT B7 B6 B5 B4 B3 B2 B1 B0 (HEX) 0 0 0 0 0 0 0 0 00 Input Port Read byte xxxx xxxx(1) 0 0 0 0 0 0 0 1 01 Output Port Read/write byte 1111 1111 0 0 0 0 0 0 1 0 02 Polarity Inversion Read/write byte 0000 0000 0 0 0 0 0 0 1 1 03 Configuration Read/write byte 1111 1111 (1) Undefined 8 Submit Documentation Feedback |
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