C12 datasheet(45/72 Pages) AMSOSRAM

45 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

43 - 70

If the register subX_en is set, the result from the pwm_modulator is inverted logically. That means for up

dimming the starting current is defined by currX_adder - 1 and the end current is defined by currX_adder -

currX_current - 1. An overflow of the internal bus (8 Bits wide to the IDAC) has to be avoided by the register

settings (currX_adder - currX_current - 1 must not be below zero).

Its purpose is to dim one channel e.g. CURR41 from e.g. 110% to 10% of curr41_current and at the same time

dim another channel e.g. CURR42 from 20% to 120% of curr42_current.

Note:

The adder logic operates independent of the currX_mode setting, but its main purpose is to work

together with the pwm modulator (improved up/down dimming)

If the adder logic is not used anymore, set the bit currX_adder to 0. (Setting adder_currentX to 0 is

not sufficient)

Figure

28 – PWM Table

Decrease by 1/4th every

step

Decrease by 1/8th every

step

Seconds

Seconds Seconds

Seconds

Step

%Dimming

PWM

%Dimming

PWM

50msec/

Step

25msec/

Step

5msec/

Step

2,5msec/

Step

100,0

255

100,0

255

0,00s

0,000s

75,3

192

87,8

224

0,05s

0,03s

0,005s

0,003s

56,5

144

76,9

196

0,10s

0,05s

0,010s

0,005s

42,4

108

67,5

172

0,15s

0,08s

0,015s

0,008s

31,8

59,2

151

0,20s

0,10s

0,020s

0,010s

23,9

52,2

133

0,25s

0,13s

0,025s

0,013s

18,0

45,9

117

0,30s

0,15s

0,030s

0,015s

13,7

40,4

103

0,35s

0,18s

0,035s

0,018s

10,6

35,7

0,40s

0,20s

0,040s

0,020s

8,2

31,4

0,45s

0,23s

0,045s

0,023s

6,3

27,5

0,50s

0,25s

0,050s

0,025s

4,7

24,3

0,55s

0,28s

0,055s

0,028s

3,5

21,6

0,60s

0,30s

0,060s

0,030s

2,7

19,2

0,65s

0,33s

0,065s

0,033s

2,4

16,9

0,70s

0,35s

0,070s

0,035s

2,0

14,9

0,75s

0,38s

0,075s

0,038s

1,6

13,3

0,80s

0,40s

0,080s

0,040s

1,2

11,8

0,85s

0,43s

0,085s

0,043s

0,8

10,6

0,90s

0,45s

0,090s

0,045s

0,4

9,4

0,95s

0,48s

0,095s

0,048s

0,0

8,2

1,00s

0,50s

0,100s

0,050s

7,5

1,05s

0,53s

0,105s

0,053s

6,7

1,10s

0,55s

0,110s

0,055s

5,9

1,15s

0,58s

0,115s

0,058s

5,5

1,20s

0,60s

0,120s

0,060s

5,1

1,25s

0,63s

0,125s

0,063s

4,7

1,30s

0,65s

0,130s

0,065s

4,3

1,35s

0,68s

0,135s

0,068s

3,9

1,40s

0,70s

0,140s

0,070s

3,5

1,45s

0,73s

0,145s

0,073s

3,1

1,50s

0,75s

0,150s

0,075s

2,7

1,55s

0,78s

0,155s

0,078s

2,4

1,60s

0,80s

0,160s

0,080s

2,0

1,65s

0,83s

0,165s

0,083s

1,6

1,70s

0,85s

0,170s

0,085s

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