User Guide

Figure 70 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.

RS MMC interface

The reduced size (24mm x 18mm x 1.4mm) multimedia card slot is located under the battery. The device

supports RS MMC hot insertion so it is possible to remove/insert the card when the phone is powered on.

RS MMC card is connected to the application processor MMC/SDIO2 (1.8V) interface. MMC interface is shown

in the following figure:

Figure 71 MMC interface

The detection of RS MMC card removal/insertion is done via hall sensor.

Battery interface

The battery interface supports a 3-pole battery interface. The interface consists of three connectors: VBAT,

BSI and GND.

The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.

RM-49

System Module Nokia Customer Care

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