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Applications Information (continued)
? I BL_FINAL = new value written to register 04h (register
07h bit B3BEN must equal 0), however, the “Target”
occur immediately. When changing brightness without
effects, registers 02h through 05h are used for this func-
?
?
value of register 07h has no effect on fade.
t FADE_IN = contents of bits ER2_[2:0] in register 0Fh
t FADE_OUT = t FADE_IN
tion. The target values of registers 06h through 09h are
not involved.
Figure 8 illustrates the brightness change with respect to
Auto-Dim Lighting Effect
Two auto-dim settings are provided — auto-dim full and
time. An example of brightness change to bank #4 with
no lighting effect, is as follows:
auto-dim partial. These settings provide automatic
dimming of bank #1. The auto-dim delay times are set using
the group #1 target and start time register (10h). Delay
?
?
I BL_INITIAL = previous value written to register 05h
I BL_FINAL = new value written to register 05h
times are 8 times the group #1 target and start times.
Auto-dim full provides a time-out and dimming function
followed by a time-out and turn-off function. Auto-dim
full begins when the bank is enabled (or re-enabled), the
bank will first go to the target current and wait for a count
of 8 times the group #1 target time. The bank will then
dim to the “start” current and wait for a count of 8 times
the group #1 start time. The bank will then turn off.
The register 05h bit B4FEN must equal 0, and register 09h
bit B4BEN must equal 0, however, the “Target ” value of
register 09h has no effect on the final current.
Fade State Diagram
The state diagram in Figure 2 describes the fade opera-
tion. If the backlight enable bits are disabled during an
Auto dim partial provides the time-out and dimming func-
No change
Immediate
change to new
bright level
tion, but does not turn off backlights. Auto-dim partial
begins when the bank is enabled (or re-enabled), the bank
Write
BxFEN=0
BxFEN=0
Write new
bright level
will first go to the target current and wait for a count of 8
times the group #1 target time. The bank will then dim to
the “start” current. The bank will not turn off automatically.
Write
BxFEN=1
Auto-dim is available only for group #1. After selecting an
auto-dim option, the bank’s blink effect must be enabled to
enable auto-dim. The bank must then be enabled or re-
enabled to begin the auto-dim. Auto-dim partial is illustrated
Immediate
change to
new bright
level
Write
BxFEN=0
BxFEN=1
No change
Write
new fade
in Figure 6, and auto-dim full is illustrated in Figure 7.
Brightness Change without Effects
There are two ways to change brightness while using no
lighting effect. One way is to set the effect rate option to
the zero value “snap to target” (a function of register 0Fh).
This method will block all lighting effects on all banks
within a group. Another way to change brightness, with
no lighting effect, is to set the BxFEN and BxBEN both
equal to zero. This second method will block all lighting
effects on a single bank, and with no influence over other
banks within the group.
Write
BxFEN=0
or
Write {0,0,0}
to effect rate
bits register
0Fh
No
change
Write
BxFEN=1
Write new
bright
level
Fade Fade
ends begins
Fade
processing
Continue
fade using
new rate
rate
Write
BxFEN=1
Fade begins
at 0mA
Fade is
redirected toward
the new value
from current
state
Write new
bright level
Write entire
bank’s enable bits
BLxEN = 0
Write
BLxEN = 1
Backlights
disabled
Bank
turns off
immediately
Writing a new value to the backlight current register, while
effects are disabled, will cause the change in brightness to
Figure 2 — State Diagram for Fade Function
16
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