Rm-104 Standby Light Design; Blinking; On, But Not Blinking; Off - Nokia NPL-4 Series Manual

NPL-4/5/RM-104
System Module and User Interface
Figure 30: Display and Air Bubble LEDs driver and Control Diagram
VLED
DLIGHT

RM-104 standby light design

Blinking:

Air bubble LED (V319) is used for standby light feature. Voltage supply VLED for LED is
taken from DC/DC converter. The converter is controlled by the UEMEK via CALLED1 out-
put. Standby light feature can be used only in idle mode. The LED is lit up periodically
and UEMEK Klight-line, controls it. Using Klight as PWM mode the LED is lit and dimmed
smoothly.

On, but not blinking:

Air bubble LED is always on same time with LCD and keypad lights. When the LED is on
Klight line is high state.

Off:

User can switch blinking effect off from the user interface.
Copyright © 2005 Nokia Corporation. All rights reserved.
Page 70
NA
R=27Ω
Figure 31: Standby light connections
Nokia Customer Care
Display Air bubble
led
R=1000
Ω
Issue 2 05/05