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ASL5015FHN 数据表(PDF) 16 Page - NXP Semiconductors |
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ASL5015FHN 数据表(HTML) 16 Page - NXP Semiconductors |
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16 / 69 page  NXP Semiconductors ASL5xxxyHz Matrix LED Controller (MLC) ASL5xxxyHz All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved. Product data sheet Rev. 2.1 — 5 February 2019 16 / 69 (1) Curve_1_Fade_in/out (5) Curve_5_Fade_in/out (2) Curve_2_Fade_in/out (6) Curve_6_Fade_in/out (3) Curve_3_Fade_in/out (7) Curve_7_Fade_in/out (4) Curve_4_Fade_in/out (8) Curve_8_Fade_in/out Figure 9. Example PWM Polynomial curves (Default curves in MTP) The equation to determine the curve is up to a third-grade polynomial: Ax3 + Bx2 + Cx + D The system makes an absolute calculation with the first x (step) value and then uses an incremental calculation to ensure no glitch between consecutive PWM Duty Cycle values, even when the shift value is changed to modify the curve speed. Absolute calculation is applied only when START command is used, for NOW or AUTO bits, the incremental calculation is used. Note: A system emulation tool is available and can reproduce any possible scenario. The implementation of a differential calculation ensures a glitch-free system. This method allows a very smooth LED dimming without any undesirable light glitch. The information to be stored in the MTP are only the polynomial coefficient values A, B, C and D. Then, the system calculates the resulting PWM duty cycle on the fly with an internal PWM generator (in the Smart version, ASL50xxyHz). Several curves can be sequenced in case of long fade-in or fade-out scenarios. This feature is only available in the Smart versions, ASL50xxyHz. The ASL5015yHz and ASL5008yHz allow the storage of eight-polynomial curves. The curves can be followed in both directions, depending on whether the stop position is greater or lower than the start position; and the number of fade-in scenarios do not have to be the same as the fade-out ones. It may be necessary to speed up or slow down a curve or interrupt a fade-in curve to set the PWM duty cycle to 100 % immediately, such as in the case of high-beam flashing. This adjustment is possible by changing the shift value. The programmed coefficients in the internal MTP can also be negative, for that reason there are 13 bits reserved per coefficient. That gives the possibility to make smoother curves and shapes that are not possible with just positive coefficients. The available |
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