www.ti.com

TCA6507

WITH INTENSITY CONTROL AND SHUTDOWN

SCPS164B – MAY 2007 – REVISED NOVEMBER 2007

Table 13. Time Parameters

CODE

TIME (ms)

0

0

1

64

2

128

3

192

4 (default)

256

5

384

6

512

7

768

8

1024

9

1536

10

2048

11

3072

12

4096

13

5760

14

8128

15

16320

The Maximum Intensity register (register 8) defines the duty cycle of the waveform driving the LED in its fully-on

state per region F in Figure 7. The first four bits (C7–C4) in this register set the duty cycle for BANK1 and the

next four bits (C3–C0) set the duty cycle for BANK0. The data for each bank is a binary number between 0 and

15. For BANK1, the MSB is bit C7, while the LSB is bit C4. For BANK0, the MSB is bit C3, while the LSB is bit

C0. The values in this register also define the LED intensity indicated by the BRIGHT_F0 or BRIGHT_F1 modes.

The intensity of each LED is updated 125 times per second (every 8 ms with a 32-kHz clock).

Table 14. Register 8 (Maximum Intensity Register)

BANK

BANK1

BANK0

BIT

C7

C6

C5

C4

C3

C2

C1

C0

DEFAULT

1

1

1

1

1

1

1

1

Table 15. Intensity Parameters (see Figure 7)

REGISTER

REGION

PARAMETER NAME

PARAMETER RANGE

REGISTER NAME

REGISTER

RANGE

0 to 16320 ms

A1, A2

Fade-on time

0 to 15

Fade-On Time

2

(exponential trend)

0 to 16320 ms

B1, B2

Fully-on time

0 to 15

Fully-On Time

3

(exponential trend)

0 to 16320 ms

C1, C2

Fade-off time

0 to 15

Fade-Off Time

4

(exponential trend)

0 to 16320 ms

D

First fully-off time

0 to 15

First Fully-Off Time

5

(exponential trend)

0 to 16320 ms

E

Second fully-off time

0 to 15

Second Fully-Off Time

6

(exponential trend)

F

Maximum intensity

0 to 100%

0 to 15

Maximum Intensity

7

10

Submit Documentation Feedback

Copyright © 2007, Texas Instruments Incorporated

Product Folder Link(s): TCA6507