Nokia 8850 Manual Do Serviço
NSM–2
UI Module
UI Module
PAMS Technical Documentation
Page 4
Issue 1 12/1999
Nokia Mobile Phones Ltd.
Notes
Unit
Max
Typ
Min
Parameter
Signal
PWRONX
Power on signal
0
0.7 x VBB
0.3 x VBB
VBB
V
Power on key
ROW5/
LCDCD
LCDCD
LCD command / data
0
0.7 x VBB
0.3 x VBB
VBB
Keyboard matrix
row 5
row 5
LCD driver code/
data selection
data selection
SCL
Serial clock for LCD
0
0.7 x VBB
0.3 x VBB
VBB
LCD driver serial
clock
clock
SDA
Serial data for LCD
0
0.7 x VBB
0.3 x VBB
VBB
LCD driver serial
data
data
LCDEN
LCD enable
0
0.7 x VBB
0.3 x VBB
VBB
LCD driver chip
select
select
LCDRSTX
Reset
0
0.7 x VBB
0.3 x VBB
VBB
LCD driver reset
GND
0
0
Ground
BUZZER
0
0.3 x VBB
PWM low level
0.7 x VBB
VBB
PWM high level
440
4700
Hz
Buzzer PWM fre-
quency
quency
0
50
%
PWM duty cycle
VBB
2.7
2.8
2.9
V
Logic supply volt-
age
age
LIGHT
0
0.7 x VBB
0.3 x VBB
VBB
Illumination con-
trol
trol
EARN
17.6
788
mV
Connected to
COBBA EARN
output.
COBBA EARN
output.
EARP
17.6
788
mV
Connected to
COBBA EARP
output.
COBBA EARP
output.
CCUT
Charging control
0
0.7 x VBB
0.3 x VBB
VBB
Stops charging
LCD Module Interface
Pin
Line
Symbol
Parameter
Mini-
mum
mum
Typical
/ Nomi-
/ Nomi-
nal
Maxi-
mum
Unit
Notes
1
VBB
Supply voltage
2.7
2.8
2.9
V
300
uA
2
SCLK
Serial clock input
0
4.0
MHz
VBB = 2.7V
0
VBB
V
3
SDA
Serial data input
0
0.3xVBB
0.7xVBB
VBB