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B7

B4

B3

B2

B1

B0

B5

B6

TCA6507

WITH INTENSITY CONTROL AND SHUTDOWN

SCPS164B – MAY 2007 – REVISED NOVEMBER 2007

internal register defined by the command byte. Bit B4 in the command byte is used to determine the

programming mode. If B4 is low, all data bytes are written to the register defined by B0, B1, B2, and B3. If B4 is

high, the last four bits of the command byte are automatically incremented after the byte is written, and the next

data byte is stored in the corresponding register. Registers are written in the sequence shown in Table 3. Once

the Initialization register (register 10) is written to, the command byte returns to 0 (Select0 register). Registers 11

to 15 are reserved, and a command byte that references these registers is not acknowledged by the TCA6507.

The upper three bits (B7–B5) of the command byte must be programmed as zeroes for proper operation.

If a Stop condition occurs after the command byte is received, the TCA6507 stores the command byte and then

Figure 6. Control Register Bits

Table 2. Command Byte

BIT

FUNCTION

B7

Reserved. Must be programmed as 0.

B6

Reserved. Must be programmed as 0.

B5

Reserved. Must be programmed as 0.

B4

Auto increment

B3

Register address 3

B2

Register address 2

B1

Register address 1

B0

Register address 0

Table 3. Control Register Description

CONTROL REGISTER BITS

COMMAND

POWER-UP

REGISTER

PROTOCOL

BYTE (HEX)

DEFAULT

B3

B2

B1

B0

0

0

0

0

0x00

Select0

Read/write byte

0000 0000

0

0

0

1

0x01

Select1

Read/write byte

0000 0000

0

0

1

0

0x02

Select2

Read/write byte

0000 0000

0

0

1

1

0x03

Fade-On Time

Read/write byte

0100 0100

0

1

0

0

0x04

Fully-On Time

Read/write byte

0100 0100

0

1

0

1

0x05

Fade-Off Time

Read/write byte

0100 0100

0

1

1

0

0x06

First Fully-Off Time

Read/write byte

0100 0100

0

1

1

1

0x07

Second Fully-Off Time

Read/write byte

0100 0100

1

0

0

0

0x08

Maximum Intensity

Read/write byte

1111 1111

1

0

0

1

0x09

One Shot / Master Intensity

Read/write byte

0000 1111

1

0

1

0

0x10

Initialization

Write byte

N/A

1

0

1

1

0x11

Reserved

N/A

N/A

1

1

0

0

0x12

Reserved

N/A

N/A

1

1

0

1

0x13

Reserved

N/A

N/A

1

1

1

0

0x14

Reserved

N/A

N/A

1

1

1

1

0x15

Reserved

N/A

N/A

Copyright © 2007, Texas Instruments Incorporated

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