參數(shù)資料
型號(hào): LP3954
廠商: National Semiconductor Corporation
英文描述: Advanced Lighting Management Unit
中文描述: 高級(jí)照明管理單位
文件頁(yè)數(shù): 26/56頁(yè)
文件大?。?/td> 5801K
代理商: LP3954
ADJUSTMENT
WLED1-4[7:0]
WLED5-6[7:0]
0000 0000
0000 0001
0000 0010
0000 0011
Driver current,
ma (typical)
0
0.1
0.2
0.3
25.3
25.4
25.5
1111 1101
1111 1110
1111 1111
WLED Output Current vs. Voltage
20132238
FADE IN / FADE OUT
LP3954 has an automatic fade in and out for main and sub
backlight. The fade function is enabled with EN_FADE bit.
The slope of the fade curve is set by the SLOPE bit. Fade
control for main and sub display is set by FADE_SEL bit.
EN_FADE
0 Automatic fade disabled
1 Automatic fade enabled
0 Fade execution time 1.3s
1 Fade execution time 0.65s
0 Fade controls WLED1-4
1 Fade controls WLED5-6
SLOPE
FADE_SEL
Note:
if DISPL=1 and FADE_SEL=0, Fade effects to WLED1-6
Recommended fading sequence:
1.
2.
3.
4.
5.
6.
ASSUMPTION: Current WLED value in register
Set SLOPE
Set FADE_SEL
Set EN_FADE = 1
Set target WLED value
Fading will be done either within 0.5s or 1s based on
Slope selection
WLED dimming, SLOPE=0
20132239
WLED dimming, SLOPE=1
20132240
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PDF描述
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