How Ambient Light Sensor Works?

Ambient light sensor working principle is, it is a photodetector, used for detecting the sum of ambient light nearby & appropriately reduces the mobile screen's light. ... By dimming the mobile screen one can prolong the lifetime of the battery.

How ambient light sensor works in mobile phones?

Ambient-light sensors (ALS) are widely used in smartphones to provide information about ambient-light levels, in support of the backlight LED power circuit. ... It also must be able to perform proximity detection (to turn the display off when held to the user's face) as well as the core ambient-light measurement function.

What is the output of ambient light sensor?

The typical digital output ambient light sensor (Figure 5) has a 16-bit digital I2C output. In addition to amplification for the photodiode, the IC's integrated ADC converts the photosensor's output to an I2C signal for direct connec- tion to the I2C communication bus of an MCU or base- band processor.