User Interface - Nokia RM-333 Service Manual

RM-333; RM-334; RM-335
System Module and User Interface

User interface

User interface
The UI module contains the following main features:
• ITU keypad and five-way cursor control and dedicated multimedia key implemented on a standard cross-
point matrix
• Finger position sensing keys for functions not part of the ITU matrix
• Finger position sensing beneath the five-way cursor control for the implementation of scrolling features
in the UI
• The handset microphone and one of the IHF speakers
• Various independently controlled lighting zones for the UI features described above
The cross-point matrix, LEDs, microphone and IHF are connected to the handset engine using the I/O expander
described below, and the finger position sensing controller is connected via an I2C bus.
A block diagram of the UI module is shown below. For clarity, the filtering components are not shown.
Issue 2
Figure 71 Camera block diagram
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