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ADP5501
The BL_FI timer in Register 0x04 can be used for smooth fade-
in transitions from low to high backlight settings such as off to
BACKLIGHT
CURRENT
FADE-IN
FADE-OUT
MAX-TO-DIM
FADE-OUT
FADE-IN
dim, off to maximum, and dim to maximum. The BL_FI timer
can be programmed to one of 15 settings ranging from 0.3 sec
MAX
OFF-TO-MAX
FADE-IN
FADE-OUT
to 5.5 sec. The BL_FI timer should be programmed before
asserting BL_EN.
30.0
27.5
25.0
DIM
FADE-OUT
DIM-TO-OFF
22.5
0.3 SEC
20.0
17.5
0.6 SEC
0.9 SEC
1.2 SEC
BL_EN = 1 DIM_EN = 1 BL_EN = 0
BL_EN = 0
BL_EN = 0
15.0
1.5 SEC
1.8 SEC
BL_EN = 1
BL_EN = 1
12.5
10.0
7.5
5.0
2.5
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
Figure 24. Backlight Turn-On/Turn-Off/Dim with Fade Timers
Figure 24 shows the fade timers in use. With BL_FI and BL_FO
programmed, if BL_EN is asserted, the backlight fades in to its
maximum setting. If DIM_EN is asserted, the backlight fades
out to its dim setting. If BL_EN is cleared, the backlight fades
0
0
0.5
1.0
1.5
2.0 2.5 3.0 3.5
4.0
4.5
5.0
5.5
out to off.
DIM TIMER
FADE-IN TIME (Sec)
Figure 22. Linear Fade-In Times
The time programmed in BL_FI represents the time it takes the
backlight current to go from 0 mA to 30 mA. Fading between
intermediate settings is shorter.
The BL_FO timer in Register 0x04 can be used for smooth fade-
out transitions from high to low backlight settings such as
maximum to dim and dim to off. The BL_FO timer can be
programmed to one of 15 settings ranging from 0.3 sec to 5.5 sec.
During any point in a fade-out, if BL_EN is asserted, the
backlight stops at its current fade-out position and begins
fading in.
The fade-in and fade-out timers can be used independently of
each other; that is, fade-in can be enabled while fade-out is dis-
abled. The fade timers can also be used with the off and dim timers.
Figure 25 shows the fade timers used with the dim and off timers.
BACKLIGHT
CURRENT
The BL_FO timer should be programmed before asserting BL_EN.
30.0
0.3 SEC
27.5
0.6 SEC
0.9 SEC
25.0
1.2 SEC
MAX
FADE-IN
RUNNING
FADE-OUT
22.5
20.0
17.5
1.5 SEC
1.8 SEC
2.1 SEC
2.4 SEC
2.7 SEC
DIM
OFF TIMER
RUNNING
FADE-OUT
15.0
12.5
3.0 SEC
3.5 SEC
4.0 SEC
10.0
7.5
5.0
4.5 SEC
5.0 SEC
5.5 SEC
BL_EN = 1 DIM_EN = 1
SET BY USER
SET BY INTERNAL STATE MACHINE
BL_EN = 0
DIM_EN = 0
2.5
Figure 25. Fade/Dim/Off Timers Used Together
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 23. Linear Fade-Out Times
The time programmed in BL_FO represents the time it takes
the backlight current to go from 30 mA to 0 mA. Fading
between intermediate settings is shorter.
Rev. 0 | Page 12 of 28
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