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Blink Control

Example of Blink Control

A value of 3 is written into BANK1 in the

Fade-On Time register.

0011 in BANK1 = 192 ms in Fade-On time

A value of 5 is written into BANK1 in the

Fully-On Time register.

0101 in BANK1 = 384 ms in fully-on time

A value of 3 is written into BANK1 in the

Fade-Off Time register.

0011 in BANK1 = 192 ms in fade-off time

A value of 8 is written into BANK1 in the second

Fully-Off Time register.

1000 in BANK1 = 1024 ms in fully-off time (second)

A value of 6 is written into BANK1 in the First

Fully-Off time register.

0110 in BANK1 = 512 ms in fully-off time (first)

<start>, …, <command with auto-increment>, <data>, <data>, <data>, <data>, <data>, <data>, <data>, <data>, <stop>

Start, 0001 0000, 0X02, 0X02, 0X02,

,

,

,

,

, Stop

192ms

192ms

192ms

192ms

384ms

512ms

384ms

1024ms

TCA6507

WITH INTENSITY CONTROL AND SHUTDOWN

SCPS164B – MAY 2007 – REVISED NOVEMBER 2007

A command byte of 0001 0000 writes first to the Select0 register. Data written is 0000 0010. Since

auto-increment is enabled, the next data byte goes into Select1 and Select2 registers, respectively (see

Table 21).

Table 21. LED Operation Example

MSB

LSB

Select0

X

0

0

0

0

0

1

0

Select1

X

0

0

0

0

0

1

0

Select2

X

0

0

0

0

0

1

0

Output or

X

P6

P5

P4

P3

P2

P1

P0

LED affected

X

7th LED

6th LED

5th LED

4th LED

3rd LED

2nd LED

1st LED

For P1 or the second LED, the combination of 1 for the Select0 register (Bit 1), 1 for the Select1 register bit (bit

1), and 1 for the Select2 register bit (bit 1) puts the LED in a state where it blinks with intensity characteristic of

BANK1 (PWM1) (see Table 4).

The Fade-On time, Fully-On time, Fade-Off time, First Fully-Off time, and Second Fully-Off time registers must

be written to for basic blink control. Each of these registers has eight bits – top four bits for BANK1 (or PWM1)

and bottom four bits for BANK0 (or PWM0) (see Table 17).

Each BANK or PWM has a default value of 4 (0100), which translates to a time of 256 ms. The largest value for

each BANK or PWM is 15 (1111), which translates to a time of 16320 ms (see Figure 7 and Table 15).

Starting with a powerup/reset and all seven LEDs off, here is an example (using auto-increment):

This sets the blink cycle as such for PWM1 or BANK1:

24

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