User Guide

Battery interface

The phone is powered by a 3-pole BL-5F battery. The three poles are named VBAT, BSI and GND where the

BSI line is used to recognize the battery capacity. This is done by means of an internal battery pull down

resistor.

Figure 42 Battery pin order

Battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line, which

is located on the main PWB, at a place where the phone temperature is most stabile.

The connection from the charger connector to the charger is established via a charger adaptor.

For service purposes, the device software can be forced into local mode by using pull down resistors

connected to the BSI line.

Camera system

The device's camera system consists of camera processor, which is connected to the application processor.

The camera processor has external SDRAM and it used N5452 IC to control AF and mechanical shutter. The

main camera and flash driver is connected to the camera processor. The front camera (second camera) is

connected to application processor and it shares the CCP-bus with the camera processor through switches

N5400 and 5401.

Figure 43 Camera system block diagram

RA-6

System Module

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