User Guide

Hall sensor detects the slide position. There is a magnet in slide mechanics under the display module and

when the slide is closed Hall sensor is in magnetic field.

Figure 65 Hall sensor

SIM interface

The device has one SIM (Subscriber Identification Module) interface. It is only accessible if battery is removed.

The SIM interface consists of an internal interface between RAP and EM ASIC (N2200), and of an external

interface between N2200 and SIM contacts. The main SIM interface functionality is in RAP while the EM ASIC

takes care of power up/down, card detection, ATR (Answer To Reset) counting and level shifting.

The SIM IF is shown in the following figure:

Figure 66 SIM interface

The EM ASIC handles the detection of the SIM card. The detection method is based in the BSI line. Because of

the location of the SIM card, removing the battery causes a quick power down of the SIM IF.

The EM ASIC SIM1 interface supports both 1.8 V and 3.0 V SIM cards. The SIM interface voltage is first 1.8 V

when the SIM card is inserted, and if the card does not response to the ATR a 3 V interface voltage is used.

The data communication between the card and the phone is asynchronous half duplex, and the clock supplied

to the card is 1-5 MHz, which is 3.2 MHz by default (in GSM system). The data baud rate is the SIM card clock

frequency divided by 372 (by default), 64, 32 or 16.

RM-208

Nokia Customer Care System Module

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