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AS3688 Datasheet(PDF) 45 Page - ams-OSRAM AG |
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AS3688 Datasheet(HTML) 45 Page - ams-OSRAM AG |
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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: 1. 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) 2. 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 1 100,0 255 100,0 255 0,00s 0,00s 0,000s 0,000s 2 75,3 192 87,8 224 0,05s 0,03s 0,005s 0,003s 3 56,5 144 76,9 196 0,10s 0,05s 0,010s 0,005s 4 42,4 108 67,5 172 0,15s 0,08s 0,015s 0,008s 5 31,8 81 59,2 151 0,20s 0,10s 0,020s 0,010s 6 23,9 61 52,2 133 0,25s 0,13s 0,025s 0,013s 7 18,0 46 45,9 117 0,30s 0,15s 0,030s 0,015s 8 13,7 35 40,4 103 0,35s 0,18s 0,035s 0,018s 9 10,6 27 35,7 91 0,40s 0,20s 0,040s 0,020s 10 8,2 21 31,4 80 0,45s 0,23s 0,045s 0,023s 11 6,3 16 27,5 70 0,50s 0,25s 0,050s 0,025s 12 4,7 12 24,3 62 0,55s 0,28s 0,055s 0,028s 13 3,5 9 21,6 55 0,60s 0,30s 0,060s 0,030s 14 2,7 7 19,2 49 0,65s 0,33s 0,065s 0,033s 15 2,4 6 16,9 43 0,70s 0,35s 0,070s 0,035s 16 2,0 5 14,9 38 0,75s 0,38s 0,075s 0,038s 17 1,6 4 13,3 34 0,80s 0,40s 0,080s 0,040s 18 1,2 3 11,8 30 0,85s 0,43s 0,085s 0,043s 19 0,8 2 10,6 27 0,90s 0,45s 0,090s 0,045s 20 0,4 1 9,4 24 0,95s 0,48s 0,095s 0,048s 21 0,0 0 8,2 21 1,00s 0,50s 0,100s 0,050s 22 7,5 19 1,05s 0,53s 0,105s 0,053s 23 6,7 17 1,10s 0,55s 0,110s 0,055s 24 5,9 15 1,15s 0,58s 0,115s 0,058s 25 5,5 14 1,20s 0,60s 0,120s 0,060s 26 5,1 13 1,25s 0,63s 0,125s 0,063s 27 4,7 12 1,30s 0,65s 0,130s 0,065s 28 4,3 11 1,35s 0,68s 0,135s 0,068s 29 3,9 10 1,40s 0,70s 0,140s 0,070s 30 3,5 9 1,45s 0,73s 0,145s 0,073s 31 3,1 8 1,50s 0,75s 0,150s 0,075s 32 2,7 7 1,55s 0,78s 0,155s 0,078s 33 2,4 6 1,60s 0,80s 0,160s 0,080s 34 2,0 5 1,65s 0,83s 0,165s 0,083s 35 1,6 4 1,70s 0,85s 0,170s 0,085s |
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