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TCA6507RUER Datasheet(PDF) 6 Page - Texas Instruments

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Part # TCA6507RUER
Description  LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TCA6507RUER Datasheet(HTML) 6 Page - Texas Instruments

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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
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TCA6507


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