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HCMS-39X6 датащи(PDF) 21 Page - AVAGO TECHNOLOGIES LIMITED |
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HCMS-39X6 датащи(HTML) 21 Page - AVAGO TECHNOLOGIES LIMITED |
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21 / 22 page ![]() Appendix F. Reference Material Application Note 1027: Soldering LED Components Application Note 1015: Contrast Enhancement Techniques for LED Displays Figure 10. Relative luminous Intensity versus ambient temperature. Appendix E. Display Brightness Two ways have been shown to control the brightness of this LED display: setting the peak current and setting the duty factor. Both values are set in Control Word 0. To compute the resulting display brightness when both PWM and peak current control are used, simply multiply the two relative brightness factors. For example, if Control Register 0 holds the word 1001101, the peak current is 73% of full scale (BIT D5=L, BIT D4 = L) and the PWM is set to 60% duty factor (BIT D3 = H, BIT D2 = H, BIT D1 = L, BIT D0 = H). The resulting brightness is 44% (.73 x .60 = .44) of full scale. The temperature of the display will also affect the LED brightness as shown in Figure 10. 0 -50 AMBIENT TEMPERATURE – °C 3.0 2.5 2.0 1.5 1.0 0.5 100 50 0 RED GREEN |
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