Power Key; Keys - Nokia RH-41 Series Technical Documentation Manual

RH-41
System Module

Power Key

All signals for the keyboard come from the UPP ASIC, except PWRONX line for the power
key signal which is connected directly to the UEM. The pressing of the PWR key grounds
the PWRONX line and the UEM generates an interrupt to UOO, which is then recognized
as a PWR key press.

Keys

Other keys are detected so that when a key is pressed down, the metal dome connects
one S-line and one R-line of the UPP together and creates an interrupt for the SW. This
kind of detection is also known as metaldome detection. The matrix of how lines are con-
nected and which lines are used for different keys is described in the following table. The
S-line S0 and R-line R5 are not used at all.
Returns /
Scans
R0
R1
R2
R3
R4
R5
where NC = Not Connected
Page 16
S Left
Send
1
4
7
*
Figure 3: Placement of keys
S0 S1
NC NC
NC Soft left
NC 1
NC 2
NC 3
NC NC
Nokia Corporation
CCS Technical Documentation
S Right
Up
Down
End
2 3
5 6
8
9
0
#
S2 S3
Send End
Up Down
4 7
5 8
6 9
NC NC
Confidential
S4
NC
Soft right
*
0
#
NC
Issue 2 09/2003