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1

1

0

S

0

0

0

1

0

A

A

DataFromRegister

Slave Address

Slave Address

R/W

ACKFrom

Slave

CommandByte

S

R/W

1 A

Data

A

Data

DataFromRegister

NA P

LastByte

Atthismoment,master-transmitter

becomesmaster-receiver,and

slave-receiverbecomes

slave-transmitter

ACKFrom

Slave

ACKFrom

Slave

ACKFrom

Master

NACKFrom

Master

FirstByte

1

1

0

0

0

0

1

Writes

0

1

1

0

S

0

0

0

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

1

1

1

1

0

S

0

0

0

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

1

0

1

1

0

S

0

0

0

0

A

0

1

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

1

TCA6507

WITH INTENSITY CONTROL AND SHUTDOWN

SCPS164B – MAY 2007 – REVISED NOVEMBER 2007

Figure 10. Read From Register

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).

Figure 11. Write to Select0 Register

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Figure 12. Write to Select1 Register

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Figure 13. Write to Fully-On Time Register

14

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