TCA6507_10 Datasheet, PDF (6/32 Pages) Texas Instruments – LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN

TCA6507
LOW-VOLTAGE 7-BIT I²C AND SMBus LED DRIVER
WITH INTENSITY CONTROL AND SHUTDOWN
SCPS164B – MAY 2007 – REVISED NOVEMBER 2007
Data Output
by Transmitter
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Data Output
by Receiver
NACK
SCL From
Master
S
Start
Condition
1
2
8
Figure 4. Acknowledgment on the I²C Bus
Table 1. Interface Definition
BYTE
I²C slave address
Px I/O data bus
BIT
7 (MSB)
6
5
4
3
2
1
0
0
0
1
0
X ⁽¹⁾
P6
P5
P4
P3
P2
(1) X = Don't care
Device Address
The address of the TCA6507 is shown in Figure 5.
Fixed Slave Address
ACK
9
Clock Pulse for
Acknowledgment
1
0 (LSB)
1
R/W
P1
P0
1
0
0
0
1
0
1 R/W
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.
Control Register and Command Byte
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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