Keyboard interface
Figure 29 Keypad matrix
Backlight and illumination
The illumination has four main areas: numeric keypad (2 x white LEDs), display backlight (2 x white LEDs).
The display backlight is powered by the integrated DC/DC converter of the PEARL_J IC.
In the VLED+ line of the Pearl a “VLED disconnect switch” is integrated. This avoids that the VLED line is at
VBAT level even in switched off state (which can cause electro migration problems).
Figure 30 Backlight and illumination concept
Camera concept
Camera interface
The camera module is a EDOF 3.2 Mpix. The camera is connected directly to the baseband, no hardware
accelerator is used. Processing of the image is done by phone processor using NIPS (Nokia Imaging Perfection
System) algorithms.
The CCI-bus (Camera Command Interface) is an I2C-compatible interface that is used bidirectional to transfer
commands from BB to the camera and to get information of the camera register settings from the camera
to BB.
RM-721; RM-722
System Module
Issue 1
COMPANY CONFIDENTIAL
Page 5 – 15
Copyright © 2011 Nokia. All rights reserved.
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