User Interface; Display Interface; Keyboard; Display And Keyboard Backlight - Nokia E62 Service Manual

RM-88
System Module
Pin
1 VBAT
2 BSI
3 GND
Battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line, which
is located on the transceiver PWB.
For service purposes, the device SW can be forced into local mode by using pull down resistors connected to
the BSI line.

User interface

Display interface

The device supports Oxford QVGA 2.8" TFT display with 320 x 240 resolution and 24bit colors. It uses 8-bit
display interface.

Keyboard

The device uses external COP8 micro controller to handle engine & qwerty keyboard matrix. The
communication between COP8 and RAP is handled by I2C bus.

Display and keyboard backlight

The device has one LED Driver (SMPS) that is used to drive six display LEDs.
Display LEDs are connected in to two three LED series. Current adjustment of the driver is done from the
display LED branch, and keyboard current also depends on the display brightness. In a typical use case,
keyboard LEDs are turned ON only in dark ambient lighting conditions.
The keyboard backlight is made with electroluminance. The device has discrete EL-driver, which provide
backlight for keyboard.

ALS interface

Ambient Light Sensor (ALS) is located in the upper part of the phone. It consists of the following components:
• lightguide (part of the front cover)
• phototransistor (V4400) + resistor (R4401)
• NTC + resistors (R4400, R4402, R4403)
Issue 1
Figure 56 Battery pin order
Table 14 Battery interface connections
Signal I/O
->
->
COMPANY CONFIDENTIAL
Copyright © 2006 Nokia. All rights reserved.
Engine connection
EM ASIC N2200 VBAT
EM ASIC N2200 BSI
GND
Nokia Customer Care
Notes
Battery voltage
Battery size
indication
(fixed resistor
inside the
battery pack)
Ground
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