Keyboard Interface; Ambient Light Sensor (Als) - Nokia RM-596 Service Manual

RM-596
System Module
Figure 61 Illumination

Keyboard interface

MENU key (Home key), Volume-up and Volume-down key, Lock key, and Camera Capture and auto focus key
are directly connected to RAPU BB ASIC.

Ambient Light Sensor (ALS)

Pupumon V1100 is a digital Ambient Light Sensor (ALS) which is connected to RAPU via I2C_2 bus. It does not
have an interrupt signal as in Augumon ALS. Power supply voltage is provided from VAUX2 output of EM ASIC.
ALS is used in backlight control system to measure the amount of ambient light reaching display surface so
that it is possible to adjust the display (and keypad) brightness in order to achieve good user experience.
This also helps in saving power.
Issue 2 COMPANY CONFIDENTIAL Page 6 – 25
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