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AS3676 Datasheet(PDF) 43 Page - ams AG |
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AS3676 Datasheet(HTML) 43 Page - ams AG |
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43 / 92 page  www.austriamicrosystems.com/AS3676 1v1-4 42 - 91 AS3676 Datasheet - D e ta i l e d D e s c r i p t i o n An overflow of the internal bus (8 Bits wide to the IDAC) has to be avoided by the register settings (currX_current + currX_adder must not exceed 255). 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. CURR30 from e.g. 110% to 10% of curr30_current and at the same time dim another channel e.g. CURR31 from 20% to 120% of curr31_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 suffi- cient) At the end of up/down dimming, the pwm_code register keeps its final value (for up-dimming 255 and for down- dimming 0). This can be used to identify the exact time, when up/down dimming is finished. Table 55. PWM Dimming 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 |
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