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TCA6416PWR Datasheet(PDF) 8 Page - Texas Instruments |
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TCA6416PWR Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 35 page  Device Address 0 Slave Address 1 0 0 0 0 AD DR R/W Fixed Programmable Control Register and Command Byte B2 B1 B0 B5 B4 B3 B7 B6 TCA6416 SCPS153A – DECEMBER 2007 – REVISED FEBRUARY 2009 ........................................................................................................................................ www.ti.com 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 P07 P06 P05 P04 P03 P02 P01 P00 I/O data bus P17 P16 P15 P14 P13 P12 P11 P10 The address of the TCA6416 is shown in Figure 4. Figure 4. TCA6416 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 acknowledgment of the address byte, the bus master sends a command byte, which is stored in the control register in the TCA6416. Three 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. Once a new command 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 BYTE POWER-UP REGISTER PROTOCOL (HEX) DEFAULT B7 B6 B5 B4 B3 B2 B1 B0 0 0 0 0 0 0 0 0 00 Input Port 0 Read byte xxxx xxxx(1) 0 0 0 0 0 0 0 1 01 Input Port 1 Read byte xxxx xxxx 0 0 0 0 0 0 1 0 02 Output Port 0 Read/write byte 1111 1111 0 0 0 0 0 0 1 1 03 Output Port 1 Read/write byte 1111 1111 0 0 0 0 0 1 0 0 04 Polarity Inversion Port 0 Read/write byte 0000 0000 0 0 0 0 0 1 0 1 05 Polarity Inversion Port 1 Read/write byte 0000 0000 0 0 0 0 0 1 1 0 06 Configuration Port 0 Read/write byte 1111 1111 0 0 0 0 0 1 1 1 07 Configuration Port 1 Read/write byte 1111 1111 (1) Undefined 8 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Link(s): TCA6416 |
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