TCA6507_10 Datasheet, PDF (14/32 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
www.ti.com
Slave Address
ACK From
Slave
ACK From
Slave
Slave Address
ACK From
ACK From
Slave ^{Data From Register} Master
S 10 00 10 1 0A
R/W
Command Byte
AS10 0 0 1 0 1 1A
Data
A
At this moment, master-transmitter
becomes master-receiver, and
slave-receiver becomes
slave-transmitter
R/W
First Byte
NACK From
Data From Register _Master
Figure 10. Read From Register
Data
Last Byte
NA P
Writes
Data is transmitted to the TCA6507 by sending the device address and setting the LSB to a logic 0 (see Figure 5
for device address). The command byte is sent after the address and determines which register receives the
data that follows the command byte (see Figure 11 through Figure 13).
SCL 1 2 3 4 5 6 7 8 9
Slave Address
Command Byte
Data to Register
SDA S 1 0 0 0 1 0 1 0 A 0 0 0 0 0 0 0 0 A
Data
AP
Start Condition
R/W ACK From Slave
ACK From Slave
Figure 11. Write to Select0 Register
ACK From Slave
<br/>
SCL 1 2 3 4 5 6 7 8 9
Slave Address
Command Byte
Data to Register
SDA S 1 0 0 0 1 0 1 0 A 0 0 0 0 0 0 0 1 A
Data
Start Condition
R/W ACK From Slave
ACK From Slave
Figure 12. Write to Select1 Register
AP
ACK From Slave
<br/>
SCL 1 2 3 4 5 6 7 8 9
Slave Address
Command Byte
Data to Register
SDA S 1 0 0 0 1 0 1 0 A 0 0 0 0 0 1 0 0 A
Data
Start Condition
R/W ACK From Slave
ACK From Slave
Figure 13. Write to Fully-On Time Register
AP
ACK From Slave
14
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