User Interface; Display Interface; Keyboard Interface - Nokia RM-645 Service Manual

RM-645
System Module

User interface

Display interface

The following block diagram illustrates the display interface.
Display backlight is provided directly by EM ASIC.
Figure 40 Display interface

Keyboard interface

The following block diagram shows the keyboard interface. The keyboard interface is implemented with
RAPU's GENIOs. Keyboard GENIOs are protected from ESD with 10-channel ASIPs Z4404 and Z4405. In addition
there are two capacitors C4401 and C4402 added to PWB for improving the immunity to the device's own
low band TX.
RM-645 keyboard supports 3 keys multikeypress functionality.
The LEDs at the UI mechanic assembly for main keyboard are controlled by EM ASIC.
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