Ambient Light Sensor (Als) Interface; Audio Interface - Nokia RM-627 Service Manual

RM-627
System Module
The following block diagram shows the keyboard interface.
The keyboard interface is implemented with RAPU's GENIOs.
The LEDs at the keyboard are controlled by a LED driver. The driver is controlled by a PWM signal from EM ASIC
Gazoo.
Figure 38 Keyboard interface

Ambient light sensor (ALS) interface

Ambient light sensor information is used to control keyboard and display brightness.
• Keyboard backlight is turned OFF, when it is not needed.
• Display brightness is dimmed, when environment lighting is dark.
The ambient light sensor is calibrated in production and can be re-tuned in service points, though not
recommended unless calibration coefficient is lost for some reason
Figure 39 Ambient light sensor (ALS) interface

Audio interface

The following block diagram illustrates the audio interface of the phone:
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