Alc; Only For Training And Service Purposes - LG KC560 Service Manual

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3. TECHNICAL BRIEF

The AS3675 is controlled using serial interface pins CLK and DATA. The clock line CLK is never held

Low by the AS3675(as the AS3675 does not use clock stretching of the bus)

Fast Mode Capability(Maximum Clock Frequency is 400 kHZ)

Write Formats

Write Formats (-. Single-Byte Write , -. Page-Write)

Read Formats (-. Current-Address Read -. Random-Read, - Sequential Read)

DATA Input Delay and CLK Spike Filtering by Integrated RC address.

ALC

3.11

The automatic luminance control (ALC) circuit adjusts the LED dimming by changing the LED current

automatically in response to the brightness of the surroundings. An external photodiode or similar

luminance sensor must be connected for the ALC automatic control to function. The luminance sensor is

connected to PD and must be set to increase the PD input current in response to increasing luminance

of the surroundings. In the typical application circuit in section 13, the SM8152A VREF terminal is used

and the luminance sensor photodiode is connected between PD and VREF

LGE Internal Use Only

Figure 16 I2C Serial data port control method

Figure 17 Average Iout vs Lux on photo sensor

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