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MAX8930
WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
the next 16.4ms, the internal digital logic block tries to
read the ambient light condition 16 times and calculate
the average data. This read data is automatically saved
in Register 0Dh.
Up/Down Slope Control
The up/down slope control is sometimes necessary for
dimming the main WLED_ in a natural way. The up (dark
to bright), down (bright to dark) main WLED current tran-
sition speeds are set individually.
The default value of the up/down slope is 0s. It is pro-
grammable by the settings of control bits in Register
0Ah. The up/down slope time is per 0.1mA increment;
time is set to 2.048ms. After reading the ambient light
condition and getting I LED2 with 20mA, the total time
from I LED1 to I LED2 is 0.4096s [(20mA/0.1mA) x 2.048ms
= 0.4096s].
ADC Data Offset Adjustment
The accuracy of the ALC control circuitry can be cali-
brated in each IC using the ADC data offset adjustment
register. This offset adjustment can correct for parameter
variation in the IC and in the external light sensor. This
adjustment is performed with bits 3–0 in Register 0Ch.
Table 4 shows all possibilities of dimming control for both
main WLEDs and KEY.
for example, if the I LED1 current is 0mA and the up slope
ORIGINAL DATA
SLOPE-APPLIED DATA
ILED 2
ILED 1
BRIGHTNESS
Figure 6. LED Current vs. Brightness
Table 4 . Summar y of Dimming Control for Main WLEDs and KEY
I 2 C
ALC
CAI
(PWM)
PWM
(500Hz)
I 2 C + ALC
I 2 C + CAI
ALC +
CAI
I 2 C + CAI
+ ALC
MAIN
WHITE
LEDS
DIMMING
UP/
DOWN
SLOPE
Yes
(default)
Available
Yes
Available
Yes
Not
available
No
Not
available
No
Not
available
Yes
Not
available
Yes
Not
available
No
Not
available
CONTROL
ON/OFF
Yes
(default)
Yes
No
Yes
No
No
No
No
KEY
DUTY
TRANSITION
CONTROL
Not
available
Not
available
Not
available
Available
Not
available
Not
available
Not
available
Not
available
TIME
28
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