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LP5569 数据表(PDF) 44 Page - Texas Instruments |
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LP5569 数据表(HTML) 44 Page - Texas Instruments |
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44 / 93 page  44 LP5569 SNVSAP8A – JULY 2017 – REVISED SEPTEMBER 2017 www.ti.com Product Folder Links: LP5569 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Table 21. LED2_CONTROL Register Field Descriptions (continued) Bit Field Type Reset Description 3 exp_en2 R/W 0h 0 = Linear adjustment (default) 1 = Exponential adjustment This bit is effective for both the program execution engine control and direct PWM control. 2 external_power2 R/W 0h 0 = LED is powered by charge pump (default) 1 = LED is powered by external power source 1–0 RESERVED R/W 0h 8.6.1.7 LED3_CONTROL Register (Address = Ah) [reset = 0h] LED3_CONTROL is shown in Figure 33 and described in Table 22. Return to Summary Table. LED3 Control Register Figure 33. LED3_CONTROL Register 7 6 5 4 3 2 1 0 mf_mapping3 led3_ratio_en exp_en3 external_power 3 RESERVED R/W-0h R/W-0h R/W-0h R/W-0h R/W-0h Table 22. LED3_CONTROL Register Field Descriptions Bit Field Type Reset Description 7–5 mf_mapping3 R/W 0h Master fader mapping select: 0h = No master fading (default) 1h = Master fader1 2h = Master fader2 3h = Master fader3 4h = No master fading 5h = PWM input master fading 6h = No master fading 7h = No master fading 4 led3_ratio_en R/W 0h 0 = Disables ratiometric dimming (default) 1 = Enables ratiometric dimming When ratiometric dimming is enabled, the emitted color of an RGB- LED remains the same regardless of the initial magnitude of the LED output. 3 exp_en3 R/W 0h 0 = Linear adjustment (default) 1 = Exponential adjustment This bit is effective for both the program execution engine control and direct PWM control. 2 external_power3 R/W 0h 0 = LED is powered by charge pump (default) 1 = LED is powered by external power source 1–0 RESERVED R/W 0h 8.6.1.8 LED4_CONTROL Register (Address = Bh) [reset = 0h] LED4_CONTROL is shown in Figure 34 and described in Table 23. Return to Summary Table. LED4 Control Register |
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