Figure 72 Display interface block diagram
I/O expanders and keyboards
HW53 supports LM8323 I/O expander. RM-484 includes two I/O expanders. They are connected to Rapido via
I2C bus.
The first I/O expander is located on the system/RF module. ITU keys, multimedia keys and side keys (including
volume keys, capture key and keylock switch) are connected to it as a 6x4 matrix. In addition, the I/O expander
has several general purpose IOs in use.
The second I/O expander is located on the UI/slide module. S60 keys and 5-way rocker are connected to it as
a 6x5 matrix.
Figure 73 I/O expanders and keyboard matrixes
RM-484 has three separate keyboards:
•
ITU keyboard
•
Multimedia Keyboard
•
S60 keyboard
RM-484; RM-485; RM-486
System Module and User Interface
Issue 1 COMPANY CONFIDENTIAL Page 8 –21
Copyright © 2009 Nokia. All rights reserved.
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