SP7680EB datasheet(12/16 Pages) SIPEX

12 / 16 page

June 21-07 revH

SP7680: Complete Backlight Solution



2007 Sipex Corporation

Page 12

MAIN, SUB and AUX registers

In the MAIN, SUB and AUX registers bits B7, B6,

B5, B4, B3 and B2 represent the DAC codes D5-D0

used to set the LED current in the MAIN, SUB and

AUX channels. Bits B1 and B0 are don’t care. The

following table lists the DAC codes and the

corresponding current for each channel in mA; the

table appears below and continues on the right

column.

Addressing and Writing Data to the SP7680

To write data to the SP7680 the following data

cycle must be obeyed:

[

Slave

Address

with

write

bit][Data

for

STATUS][Data for CNTRL][Data for MAIN][Data

for SUB][Data for AUX]

Six bytes are communicated each data cycle. All

the

settings

will

take

effect

right

after

the

acknowledgement bit of the current data byte.

B7…B2

Main

Sub

Aux

010001

8.5

17.0

010010

9.0

18.0

010011

9.5

19.0

010100

10.0

20.0

010101

10.5

21.0

010110

11.0

22.0

010111

11.5

23.0

011000

12.0

24.0

011001

12.5

25.0

011010

13.0

26.0

011011

13.5

27.0

011100

14.0

28.0

011101

14.5

29.0

011110

15.0

30.0

011111

15.5

31.0

100000

16.0

32.0

100001

16.5

33.0

100010

17.0

34.0

100011

17.5

35.0

100100

18.0

36.0

100101

18.5

37.0

100110

19.0

38.0

100111

19.5

39.0

101000

20.0

40.0

101001

20.5

41.0

101010

21.0

42.0

101011

21.5

43.0

101100

22.0

44.0

101101

22.5

45.0

101110

23.0

46.0

101111

23.5

47.0

110000

24.0

48.0

110001

24.5

49.0

110010

25.0

50.0

110011

25.5

51.0

110100

26.0

52.0

110101

26.5

53.0

110110

27.0

54.0

110111

27.5

55.0

111000

28.0

56.0

111001

28.5

57.0

111010

29.0

58.0

111011

29.5

59.0

111100

30.0

60.0

111101

30.5

61.0

111110

31.0

62.0

111111

31.5

63.0

B7…B2

Main

Sub

Aux

000000

000001

0.031

000010

1.0

2.0

000011

1.5

3.0

000100

2.0

4.0

000101

2.5

5.0

000110

3.0

6.0

000111

3.5

7.0

001000

4.0

8.0

001001

4.5

9.0

001010

5.0

10.0

001011

5.5

11.0

001100

6.0

12.0

001101

6.5

13.0

001110

7.0

14.0

001111

7.5

15.0

010000

8.0

16.0

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