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MAX8930
WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
The Operation of ALC Function
Table 3 shows the various conditions on the main WLED_
current for LCD backlight.
Sensor Interface
As a default value, 3V is applied from the BIAS pin. The
sensed voltage at the SENSE pin is transformed into
digital data by the embedded 8-bit ADC.
Table 3. ALC Functio n
A/D Conversion
The detection of ambient light condition is performed in
periodic time steps (4 options). BIAS and ADC are turned
off except when reading the ambient light condition. The
sensor is also turned off in between measurements. This
leads to lower power consumption. For the first 64ms,
the ambient light data is discarded because the data
might be inaccurate information in startup period. For
ALC ON/OFF
0
0
1
1
MAIN WLED_ ON/OFF
0
1
0
1
ALC BLOCK
OFF
ON
LCD BACKLIGHT CURRENT
OFF
Setup by main LED current*
OFF
Setup by ambient light data?
* The ALC for WLED backlight is disabled in this mode. It means the current for the LCD backlight is set up by the main LED cur-
rent value using either I 2 C or CAI.
? The ALC for WLED backlight is enabled in this mode. It means the current for the LCD backlight is set up by the ambient light
data from 0h to Fh.
ALCEN = 1
ALC MODE ON/OFF
ADC READ 1 CYCLE
(ALCYC1, ALCYC2)
ADC READ CYCLE
AD SIGNAL START
BIAS OUTPUT = 3V
t WAIT = 64ms OR 32ms
1 T(AD) = 1ms
16 TIMES
MEASUREMENT
ADC MOVEMENT
t(AD) = 16.4ms
AMBIENT LIGHT
DATA
t(ALC) = 80.4ms
Figure 5. ALC A/D Conversion
Maxim Integrated
27
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