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MAX8930
WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
BIAS
BIAS VOLTAGE
(3V)
OFFSET
CORRECTION
LINEAR/LOG
16 AMBIENT
LEVELS
NEG
I NPU T
LIGHT
SENSOR
(LOG OR
SENSE
8-BIT
ADC
DATA
CORRECTION
AVERAGE
FILTER
LOGARITHMIC
CURRENT
CONVERSION
SLOPE
PROCESS
WLED_
LINEAR)
CONVERSION
AMBIENT
LEVEL SCALE
DETECT
THRESHOLD
(1x, -0.5x CP)
I NPU T
AND
HYSTERESIS
ON/OFF
BY ALC
ON/OFF
KEY
Figure 4. ALC Block Diagram
AMBIENT LIGHT LEVEL READ
BY I 2 C AT THIS POINT
PWM SLOPE
AND
MAX DUTY
BY I 2 C
PWM
(500Hz)
the embedded digital processing. This data can be read
through the I 2 C (0Dh).
The conversion to LED current can be accomplished
either through a built-in initial lookup table or a built-in
user settable lookup table.
When ALC is activated, the brightness settings of the
main LEDs are controlled through the ALC control cir-
cuitry and not by the baseband processor. The default
setting on power-on reset is for control by the baseband
processor.
ON/OFF of ALC Block for Main WLEDs
ALC operation can be activated independently for the
main LED and the keypad backlight. The ALCEN bit in
register 00h activates ambient light control. The KBALC
bit in register 00h activates ON/OFF for the keypad back-
light in ALC mode. For keypad backlight, the output is
simple logic-high/logic-low.
Bias Voltage for a Sensor
An embedded LDO with a nominal 3V output provides
the bias voltage for the ambient light sensor. This bias
output is enabled as soon as the ALCEN bit is set to 1.
Maxim Integrated
The operation of the bias output voltage has two options
based on the value of the SBIAS bit (bit 7 in Register 0Ch).
When this bit is set to 1, the bias output is synchronized
with the measurement cycle. This means that the bias
voltage generator is active only when a measurement
cycle is being performed. The measurement cycle has
four different times, 0.52s, 1.05s, 1.57s, and 2.10s. When
this bit is set to 0, the bias output is always on as long as
the ALCEN bit is set to 1.
Brightness Data Conversion
16 different dimming steps are available depending on
the ambient light condition. The selection of the log or
linear conversion is possible by the setting of the LSTY
bit (bit 6 of register 0Ch).
Linear type sensor: LOG conversion
Log type sensor: Data bypass
The brightness data can be read through I 2 C (Register
at 0Dh).
LED Current Conversion
The following is the initial current value to each level
of ambient light. This value can be overwritten by I 2 C
command.
25
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