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NJU6052

REMOTE CONTROL COMMANDER IC

Japan Radio Corporation  

NJU6052

(4) PWM DIMMING CONTROL

By setting the duty data at “PWM REGISTER” bits, 8 out of 64 registers are assigned to the PWM

REGISTER 0-7. The PWM duty is changed depending on the register selected by the SENS voltage. The relation

between the PWM REGISTER and its duty is shown below.

TABLE 1 PWM DUTY vs. PWM REGISTER

REGISTER

DUTY

REGISTER

0,0,0,0,0,0

OFF

0,1,0,0,0,0

0,0,0,0,0,1

3.13%

0,1,0,0,0,1

0,0,0,0,1,0

4.69%

0,1,0,0,1,0

0,0,0,0,1,1

6.25%

0,1,0,0,1,1

0,0,0,1,0,0

7.81%

0,1,0,1,0,0

0,0,0,1,0,1

9.38%

0,1,0,1,0,1

0,0,0,1,1,0

10.94%

0,1,0,1,1,0

0,0,0,1,1,1

12.50%

0,1,0,1,1,1

0,0,1,0,0,0

14.06%

0,1,1,0,0,0

0,0,1,0,0,1

15.63%

0,1,1,0,0,1

0,0,1,0,1,0

17.19%

0,1,1,0,1,0

0,0,1,0,1,1

18.75%

0,1,1,0,1,1

0,0,1,1,0,0

20.31%

0,1,1,1,0,0

0,0,1,1,0,1

21.88%

0,1,1,1,0,1

0,0,1,1,1,0

23.44%

0,1,1,1,1,0

0,0,1,1,1,1

25.00%

0,1,1,1,1,1

DUTY

26.56%

28.13%

29.69%

31.25%

32.81%

34.38%

35.94%

37.50%

39.06%

40.63%

42.19%

43.75%

45.31%

46.88%

48.44%

50.00%

REGISTER

1,0,0,0,0,0

1,0,0,0,0,1

1,0,0,0,1,0

1,0,0,0,1,1

1,0,0,1,0,0

1,0,0,1,0,1

1,0,0,1,1,0

1,0,0,1,1,1

1,0,1,0,0,0

1,0,1,0,0,1

1,0,1,0,1,0

1,0,1,0,1,1

1,0,1,1,0,0

1,0,1,1,0,1

1,0,1,1,1,0

1,0,1,1,1,1

DUTY

51.56%

53.13%

54.69%

56.25%

57.81%

59.38%

60.94%

62.50%

64.06%

65.63%

67.19%

68.75%

70.31%

71.88%

73.44%

75.00%

REGISTER

1,1,0,0,0,0

1,1,0,0,0,1

1,1,0,0,1,0

1,1,0,0,1,1

1,1,0,1,0,0

1,1,0,1,0,1

1,1,0,1,1,0

1,1,0,1,1,1

1,1,1,0,0,0

1,1,1,0,0,1

1,1,1,0,1,0

1,1,1,0,1,1

1,1,1,1,0,0

1,1,1,1,0,1

1,1,1,1,1,0

1,1,1,1,1,1

DUTY

76.56%

78.13%

79.69%

81.25%

82.81%

84.38%

85.94%

87.50%

89.06%

90.63%

92.19%

93.75%

95.31%

96.88%

98.44%

100.00%

The relation between the PWM REGISTER and SENS voltage is reversed by the “REV” bit, as follows.

TABLE 2 REV vs. PWM REGISTER

REV

PWM REGISTER

PWM REGISTER0

PWM REGISTER1

PWM REGISTER2

0

PWM REGISTER3

PWM REGISTER4

PWM REGISTER5

PWM REGISTER6

PWM REGISTER7

PWM REGISTER7

PWM REGISTER6

PWM REGISTER5

1

PWM REGISTER4

PWM REGISTER3

PWM REGISTER2

PWM REGISTER1

PWM REGISTER0

Note 1) For the information on the relation between PWM duty and LED current (ILED), refer to “(9-1) PWM DUTY and LED

CURRENT“.

Note 2) For the information on the relation between SENS voltage and PWM REGISTER, refer to “DC ELECTRICAL

CHARACTERISTICS”.

-6-

Ver.2004-02-26

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