User Guide

RAE-6/RA-4

Nokia Customer Care 6 - Baseband Description and Troubleshooting

36 COMPANY CONFIDENTIAL Issue 1 12/04

•PDA display

•CMT display

• CMT keypad illumination

■ PDA keypad

The keyboard matrix is a full QWERTY-keyboard, and consists of 66 keys + 9-way joystick.

Space bar is built of 2 domes, so there are altogether 67 key domes in the matrix. Keyboard

matrix is organized to 8 columns and 12 rows. Joystick is a 9-way joystick and consists eight

directions (cardinal points & half-cardinal points) and push center direction to select.

The matrix is connected to a keyboard controller COP8, which wakes up whenever there is a

key pressed in the keyboard. The COP8 controller is located in the engine board 1BC. Control-

ler starts to scan the matrix to detect, which keys are pressed, and the scanning is continued

until each key is released. If there are no more key events happening inside a certain time pe-

riod, the controller will return to sleep. During the scanning, the controller will send an interrupt

to the main processor to notify that a key is pressed. When the main processor receives the

notification, it will read the pressed keys from the controller via I2C-bus. Controller will just send

the codes of the pressed keys as Hex-code; the meaning of each key code is determined in the

main processor, depending on the language version and the used application.

Hall-sensor

Hall-sensor is used to detect the PDA-lid position: there is a magnet in the coverlid just above

the Hall-sensor when the lid is closed; when the lid is opened, the Hall is released, thus waking

up the keyboard controller. The Hall-sensor has one dedicated input in the controller, and as

soon as the wake-up is detected, controller sends the lid-opened -message to the main pro-

cessor.

Block diagram

Figure 12: Block diagram of illumination.

TK11851L

Klight

Dlight

DRVEN

CMT display

3 LEDs in series,

13mA

PDA display

2x3 LEDs in series,

2x13mA

CMT Keypad

2 LEDs in series,

10mA

Diodes on

Engine PWB