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LP8555 датащи(PDF) 41 Page - Texas Instruments |
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LP8555 датащи(HTML) 41 Page - Texas Instruments |
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41 / 64 page ![]() LP8555 www.ti.com SNVS857 – FEBRUARY 2014 8.5.13 LEDEN1 Address: 0x19 D7 D6 D5 D4 D3 D2 D1 D0 RESERVED ENABLE[6:1] Bits Field Type Description 7:6 RESERVED R/O 5:0 ENABLE1 R/W LED string enables for Bank B. The ENABLE field configures the enabled LED strings. If the CONFIG.AUTO bit is 0 these LED strings will stay active when the backlight is on. If the CONFIG.AUTO bit is set, then an LED open/short condition will cause that LED string to be removed. A given LED string will never be enabled if the corresponding bit of the ENABLE field is set to 0. The OV field configures the threshold for detecting an LED overvoltage condition; which may occur when one or more LEDs are bypassed (shorted) within an LED string. 8.5.14 VOLTAGE1 Address: 0x1A D7 D6 D5 D4 D3 D2 D1 D0 VMAX1 ADAPT1 VINIT1 Bits Field Type Description Maximum boost voltage for Boost B (typical). 00 = 18 V 7:6 VMAX R/W 01 = 22 V 10 = 25 V 11 = 28 V 5 ADAPT R/W Enable adaptive headroom optimization. Initial boost voltage. When ADAPT is 0 the boost voltage will remain at the VINIT setting. The voltage 4:0 VINIT1 R/W range is from 7 V to 28 V; where 0x00 equals 7 V and 0x3F equals 28 V (typical). The VOLTAGE1.VMAX bit sets the maximum allowed boost voltage for Boost B. The boost control loop will never request a higher voltage than the VMAX value. When the VOLTAGE.ADAPT bit is set to 1 the boost voltage may vary from 7 V to the VMAX configured voltage. VINIT (DEC) VOLTAGE (V) VINIT (DEC) VOLTAGE (V) VINIT (DEC) VOLTAGE (V) 0 7.00 11 14.45 22 21.91 1 7.68 12 15.13 23 22.58 2 8.35 13 15.8 24 23.26 3 9.03 14 16.48 25 23.94 4 9.71 15 17.16 26 24.61 5 10.39 16 17.84 27 25.29 6 11.06 17 18.52 28 25.97 7 11.74 18 19.2 29 26.65 8 12.42 19 19.87 30 27.32 9 13.09 20 20.55 31 28.00 10 13.77 21 21.23 Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 41 Product Folder Links: LP8555 |
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