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TCA6507RUER Datasheet(PDF) 6 Page - Texas Instruments |
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TCA6507RUER Datasheet(HTML) 6 Page - Texas Instruments |
6 / 32 page www.ti.com S 1 2 8 9 NACK ACK Data Output by Transmitter Data Output by Receiver SCL From Master Start Condition Clock Pulse for Acknowledgment Device Address 1 0 0 0 0 1 1 Fixed Slave Address R/W Control Register and Command Byte TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Figure 4. Acknowledgment on the I2C Bus Table 1. Interface Definition BIT BYTE 7 (MSB) 6 5 4 3 2 1 0 (LSB) I2C slave address 1 0 0 0 1 0 1 R/W Px I/O data bus X(1) P6 P5 P4 P3 P2 P1 P0 (1) X = Don't care The address of the TCA6507 is shown in Figure 5. Figure 5. TCA6507 Address The last bit of the slave address defines the operation (read or write) to be performed. High (1) selects a read operation, and 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. The last four bits (B0, B1, B2 and B3) of this command byte determine the internal registers (Select0, Select1, Select2, Fade-On Time, Fully-On Time, Fade-Off Time, First Fully-Off Time, Second Fully-Off Time, Maximum Intensity and Initialization) that are affected. The command byte is sent only during a write transmission. 6 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 |
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