LG GT350 - Keypad Back-Light Illumination

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3. TECHNICAL BRIEF
LG Electronics 38/115 LGE Property
3.9 Keypad back-light illumination
There are 4 snow white color LEDs on Qwerty Key and 2 snow white color LEDs on slide Key for keypad
illumination. Slide Keypad Back-light is controlled by SGold3 PWM port which has a duty control function.
And Qwerty Key Back-light is controlled by SM-Power Flash LED port which has constant current control
function. The whole configuration of the SM-POWER Flash LED drivers is shown in below Figure11.