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ADP5501
FADE-IN
FADE-OUT
FADE OVERRIDE
A fade override feature allows the BL_FI and BL_FO timers to
be overridden when the BL_EN bit is reasserted (by the user
setting the FOVR bit in Register 0x02) during a fade-in or fade-
out period and to set the backlight to its maximum setting.
BACKLIGHT
CURRENT
OVERRIDDEN OVERRIDDEN
MAX
30.0
27.5
25.0
22.5
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0.3 SEC
0.6 SEC
0.9 SEC
1.2 SEC
1.5 SEC
1.8 SEC
2.1 SEC
2.4 SEC
2.7 SEC
3.0 SEC
3.5 SEC
4.0 SEC
4.5 SEC
5.0 SEC
5.5 SEC
0
0
0.5
1.0
1.5
2.0 2.5 3.0 3.5 4.0
4.5
5.0
5.5
FADE-OUT TIME (Sec)
Figure 28. Square Law Fade-Out Times
ADVANCED FADING (CUBIC 1 AND CUBIC 2)
BL_EN = 1
BL_EN = 0
BL_EN = 0
Two additional advanced settings in Register 0x02 are available
BL_EN = 1 BL_EN = 1
(REASSERTED BY USER ) (REASSERTED BY USER)
Figure 26. Fade Override
ADVANCED FADING (SQUARE)
Although the default linear fade algorithm gives a smooth
increase and decrease in backlight current, the resulting
increase and decrease in brightness still appear visually abrupt.
For example, for a given fade-in time, the eye notices an initial
increase in brightness as backlight current is increased but
cannot perceive much more increase in brightness as backlight
current is increased to maximum.
for fading the backlight brightness levels, Cubic 1 (BL_LAW = 10)
and Cubic 2 (BL_LAW = 11). As shown in the backlight bright-
ness control block diagram in Figure 14, linear fading and
square fading are implemented by ramping the 128 linear/square
algorithm codes at a fixed frequency over the duration of a
given fade-in/fade-out time.
Cubic fading is implemented by re-using the square algorithm
codes but ramping them with a clock source whose frequency
output increases as the sink current code increases (see Figure 29).
Cubic 1 and Cubic 2 have different frequency vs. code charac-
teristics.
The reason for this is that the eye perceives changes in light
when the brightness of the light source is changed logarithmically
(Weber-Fechner law). To provide a more natural fading exper-
ience to the user, the fade timers can be used in conjunction with
the square law approximation backlight codes (see Equation 2)
DAYLIGHT_MAX
DAYLIGHT_DIM
BST
BL_VALUE
BL_SNK
by setting BL_LAW = 01 in Register 0x02.
30.0
OFFICE_MAX
OFFICE_DIM
MUX
BL_EN
27.5
25.0
22.5
20.0
17.5
DARK_MAX
DARK_DIM
BL_LVL
BL_OFFT
BL_DIMT
BL_FI
BL_FO
COUNTERS
AND
CONTROL
LOGIC
DIM_EN
BL_LAW
CLOCK
GENERATOR
15.0
12.5
10.0
2.1 SEC
2.4 SEC
2.7 SEC
7.5
5.0
2.5
0.3 SEC
0.6 SEC
0.9 SEC
1.2 SEC
1.5 SEC
3.0 SEC
3.5 SEC
4.0 SEC
4.5 SEC
5.0 SEC
Figure 29. Backlight Brightness Control (Cubic)
0
0
0.5
1.0
1.5
1.8 SEC
2.0 2.5 3.0 3.5 4.0
4.5
5.5 SEC
5.0 5.5
FADE-IN TIME (Sec)
Figure 27. Square Law Fade-In Times
Rev. 0 | Page 13 of 28
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