User Guide

PAMS
Technical Documentation
NSE–8/9
System Module
Page 2– 69
Issue 1 07/99
UI
The UISWITCH IC is an integrated switch IC for UI purposes. It includes
control switches for buzzer–, vibra– , LED– (display & keyboard) control
and two current sinks for LED’s.
UISWITCH, N400
LCD_LED
GND
VBAT
BUZZER
Vdc_out
KBD_LED
LCDLED_CNT
BUZZ_CNT
Buzzer
VIBRA
VIBRA_CNT
Vibra
KBDLED_CNT
M
BUZZER
VIBRA
Key_light
LCD_light
LCDLED_ADJ
KBDLED_ADJ
R418
Vbb ENABLE
TEST
Vdc_out Vdc_out
4 LEDs
6 LEDs
10K
R415
12K
MAD2PR1
BuzzPWM
VibraPWM
Cobba_GJP
PData(1)
PData(3) R417
R416
Figure 19. UI Switch & Transducers
Table 35. Input and output characteristics of the UISwitch IC
Parameter Pin Symbol Min Typ Max Unit
CONTROL
itlt
LCDLED_CNT
KBDLED CNT
VIL 0 0.5 V
input voltage KBDLED_
C
NT
BUZZ_CNT
VIBRA CNT
VIH 2.0 Vbb Vbbma
x
V
Internal pull–down resistor
VIBRA
_
CNT
Rpd 60 100 180 k
LCD LED ADJUSTMENT
60 A i k t
LCDLED_ADJ Radj. –5% 12 +5% k
max. 60mA sink current
LCD light current ILCD 50 mA
KBD LED ADJUSTMENT
60 A i k t
KBDLED_ADJ Radj. –5% 10 +5% k
max. 60mA sink current
Keyboard light
current
Ikbd 60 mA
BUZZER average current
@ 50% duty cycle
@ VBAT = 3.6V
Rbuzzer (typ.) = 16
Series inductance = 0.5mH
BUZZER Ibuzz 110 mA