User Guide

CCS Technical Documentation System Module
NPM-2NX
Issue 1 07/02 ãNokia Corporation Page 45
Key/Display blocks
Table 20: KEY Block Interface Signal Description
XMIC HS/HF
Mic
Audio
-UEM
In A
n
a
2/60mV
nom
diff
Audio Headset Mic bias and audio signal
2mV nominal. HF Mic signal 60mV
nominal. Differential symmetric
input.
Accessory detection by bias loadind
(EAD
channel of slow ADC of UEM)
Hook interrupt by heavy bias loading
O
ut
Bi
as
2.1V
bias/
1kohm
DC bias
SGND In A
n
a
2/60mV
nom
diff
GND/
1kohm
Audio Mic - connected to SGND trough
lower part of splitted symmetric load
resistor (2 x 1 kohm).
XEAR HS/HF
EAR/
Amp.
Audio
-UEM
In A
n
a
100 mV
nom
diff
Audio Quasi differential DC-coupled ear-
piece/HF amplifier signal to acces-
sory. DC biased to 0.8V; XEARN a
quiet reference although have signal
when loaded due to internal series
resistor.
Ri
p
#
Signal
Name
DAMPS
/
GSM19
00
Connected
from --- to
KEY
I/O
Signal Properties
A/D--Levels---Freq./
Timing resolution
Description / Notes
KEYB(10:0) Keyboard matrix, Roller key
0 P00 Key-
Board
UPP O
ut
Di
g
0/1.8 V KeyBoard Matrix Line
1 P01 Key-
Board
KeyBoard Matrix Line
2 P02 Key-
Board
Keyboard Matrix Line
3 P03 Key-
Board
Keyboard Matrix Line
4 P04 Key-
Board
Keyboard Matrix Line
5 P10 Key-
Board
Keyboard Matrix Line
6 P11 Key-
Board
Keyboard Matrix Line