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LP8866S-Q1 Datasheet(PDF) 26 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 82 page  PWM I 2C PWM Detector DISPLAY BRIGHTNESS REGISTERS MUX BRT_MODE[1:0] SLOPER ADV_SLOPE_EN SLOPE_SELECT[2:0] Dither PWM GENERATOR PWM_FSET Resistor PHASE SHIFT MUX PWM_FSET Resistor LED DRIVER MODE Resistor OUT1 OUT2 OUT3 OUT4 HYBIRD DIMMING CURRENT MULTIPLIER LED_ CURRENT AUTO_LED_STRING_CFG[3:0] ISET Resistor DITHER_SELECT[3:0] OUT5 OUT6 MODE Resistor Figure 7-9. LP8866S-Q1 Brightness Path Diagram 7.3.8.2 Dimming Mode Dimming mode can be adjusted via an external resistor to MODE pin (see Table 7-7). Resistor with 1% accuracy is needed to ensure proper operation. Table 7-7. Dimming Mode Configuration R_MODE (kΩ) MODE I2C Address 3.92 Phase-shift PWM Mode 0x2B 4.75 Hybrid Mode 0x2B 5.76 Current Dimming Mode 0x2B 7.87 Direct PWM Mode 0x2B 11 Phase-shift PWM Mode 0x2A 17.8 Hybrid Mode 0x2A 42.2 Current Dimming Mode 0x2A 124 Direct PWM Mode 0x2A 7.3.8.3 LED Dimming Frequency The LED dimming frequency is asynchronous from the input PWM frequency for phase-shift PWM mode and hybrid dimming mode. The LED dimming frequency is generated from the internal 20-MHz oscillator and can be set to eight discrete frequencies from 152 Hz to 19.531 kHz. The PWM dimming resolution is highest when the lowest PWM frequency is used. The PWM_FSET resistor determines the LED Dimming frequency based on Table 7-8. Resistor with 1% accuracy is needed to ensure proper operation. PWM resolution in Table 7-8 is with PWM dither disabled. Table 7-8. LED PWM Frequency Selection R_PWM_FSET (kΩ) LED PWM FREQUENCY (Hz) PWM DIMMING RESOLUTION (bits) 3.92 152 16 4.75 305 16 5.76 610 15 7.87 1221 14 11 2441 13 17.8 4883 12 42.2 9766 11 124 19531 10 7.3.8.4 Phase-Shift PWM Mode In Phase-Shift PWM mode, all current active channels are turned on and off at LED dimming frequency with a constant delay. However, the number of used channels or channel groups determine the phase delay time between two neighboring channels as shown in Figure 7-10. LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 www.ti.com 26 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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