User Guide

CCS Technical Documentation System Module
RH-10
Issue 1 09/2002 Nokia Corporation Confidential Page 19
Power Key
All signals for keyboard are coming from UPP ASIC except pwr key signal which is con-
nected directly to UEM. When the pwr key is pressed, a switch connects the UEM
PWONX to GND and creates an interrupt.
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 UPP to GND and creates an interrupt for SW. Matrix of how
lines are connected and which lines are used for different keys is described in the follow-
ing table. S-line S0 and R-line R5 are not used.
NC = Not Connected
Lights
Introduction
RH-10 has 10 LEDs for lighting purposes: six (V304-V309) are for keyboard and four
(V300-V303) for display. LED type is Osram LGM470, white (type CL270WB-D) and SMD
through-hole mounted.
Interfaces
Display lights are controlled by UEM Dlight signal (8-bit register DriverPWMR, bits 3...0).
Dlight output is Pulse Width Modulation (PWM) signal, which is used to control average
current going through LEDs (see the following table). When battery voltage changes, a
new PWM value is written to the PWM register, which allows the brightness of lights to
remain consistent with all battery voltages. Signal frequency is fixed at 128Hz.
Keyboard lights are controlled by Klight signal from UEM (8-bit register DriverPWMR,
bits 7...4). Klight output is also a PWM signal and is used in a manner similar to Dlight.
Technical Information
Each LED requires a hole in the PWB where the body of the LED is located. Terminals are
soldered on component side of module PWB. LEDs have white plastic body around the
diode itself, which directs the emitted light to UI side. Current for LCD lights is limited by
resistor between Vbatt and LEDs. For keyboard lights, there are resistors in parallel.
Returns /
Scans
S1 S2 S3 S4
R0 NC Send End NC
R1 Soft left Up Down Soft right
R2 1 4 7 *
R3 2 5 8 0
R4 3 6 9 #