6

LED Control IC

W2RF004RM

Lighting Data (9 bits)

Lighting is controlled in each line with the values of the load registers. In lighting control, the gradation changes to the specified one at the specified lighting speed

The Lighting speed follows the table below.

The change time is specified with 5 bits;

Note: The change time per 1/15 of brightness represents the time required

for a change from, for example, 10/15 to 11/15 of brightness.

The change time from 0/15 to 15/15 of brightness and vice versa rep-

resents the time required for a change from 0/15 of brightness (light

OFF) to 15/15 of brightness (light completely ON). However, these

times are median values and depend on the driving output PWM cycle.

The Lighting gradation follows the table below.

The brightness is specified with 4 bits;

Lighting data light_dat (8:0)

Lighting speed

Lighting gradation

spd(4)

spd(3)

spd(2)

spd(1)

spd(0)

brt(3)

brt(2)

brt(1)

brt(0)

Lighting Speed

spd(4:0)

Change time per 1/15

of brightness

Change time from

0/15 to 15/15 of

brightness

(and vice versa)

(4) (3) (2) (1) (0)

0

0

0

0

0

Less than 60

μs

Less than 1 ms

0

0

0

0

1

8.5 ms

0.128 s

0

0

0

1

0

10.7 ms

0.160 s

0

0

0

1

1

12.8 ms

0.192 s

0

0

1

0

0

14.9 ms

0.224 s

0

0

1

0

1

17.1 ms

0.256 s

0

0

1

1

0

21.3 ms

0.320 s

0

0

1

1

1

25.6 ms

0.384 s

0

1

0

0

0

29.9 ms

0.448 s

0

1

0

0

1

34.1 ms

0.512 s

0

1

0

1

0

42.7 ms

0.640 s

0

1

0

1

1

51.2 ms

0.768 s

0

1

1

0

0

59.7 ms

0.896 s

0

1

1

0

1

68.3 ms

1.024 s

0

1

1

1

0

85.3 ms

1.280 s

0

1

1

1

1

102 ms

1.536 s

1

0

0

0

0

119 ms

1.792 s

1

0

0

0

1

137 ms

2.048 s

1

0

0

1

0

171 ms

2.560 s

1

0

0

1

1

205 ms

3.072 s

1

0

1

0

0

239 ms

3.584 s

1

0

1

0

1

273 ms

4.096 s

1

0

1

1

0

341 ms

5.120 s

1

0

1

1

1

410 ms

6.144 s

1

1

0

0

0

478 ms

7.168 s

1

1

0

0

1

546 ms

8.192 s

1

1

0

1

0

683 ms

10.24 s

1

1

0

1

1

819 ms

12.29 s

1

1

1

0

0

956 ms

14.34 s

1

1

1

0

1

1,092 ms

16.38 s

1

1

1

1

0

1,365 ms

20.48 s

1

1

1

1

1

1,638 ms

24.58 s

Lighting Gradation

brt(3:0)

Brightness

PWM duty ratio

(reference)

(3)

(2)

(1)

(0)

0000

0/15

(light OFF)

0 %

0001

1/15

0.42 %

0010

2/15

0.84 %

0011

3/15

1.25 %

0100

4/15

1.78 %

0101

5/15

2.61 %

0110

6/15

3.76 %

0111

7/15

5.42 %

1000

8/15

7.96 %

1001

9/15

11.3 %

1010

10/15

16.7 %

1011

11/15

23.3 %

1100

12/15

35.2 %

1101

13/15

48.4 %

1110

14/15

73.4 %

1111

15/15

(Light completely ON)

100 %