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PCA9557RGVR Datasheet(PDF) 9 Page - Texas Instruments |
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PCA9557RGVR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 36 page Bus Transactions Writes SCL Start Condition Data 1 Valid SDA Write to Port Data Out From Port R/W ACK From Slave ACK From Slave ACK From Slave 1 9 8 7 6 5 4 3 2 Data 1 1 A2 0 0 S 1 1 A1 A0 0 A 0 0 0 0 0 0 0 A A P tpv Data to Port Command Byte Slave Address 1/0 A2 0 0 S 1 1 A1 A0 0 A 0 0 0 0 0 0 0 A A P SCL SDA Start Condition R/W ACK From Slave ACK From Slave ACK From Slave 1 9 8 7 6 5 4 3 2 Data to Register Command Byte Slave Address Data PCA9557 www.ti.com.................................................................................................................................................... SCPS133I – DECEMBER 2005 – REVISED JUNE 2008 Data is exchanged between the master and PCA9557 through write and read commands. Data is transmitted to the PCA9557 by sending the device address and setting the least-significant bit (LSB) to a logic 0 (see Figure 4 for device address). The command byte is sent after the address and determines which register receives the data that follows the command byte. There is no limitation on the number of data bytes sent in one write transmission (see Figure 6 and Figure 7). Figure 6. Write to Output Port Register <br/> Figure 7. Write to Configuration or Polarity Inversion Registers Copyright © 2005–2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): PCA9557 |
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