User Guide

Figure 126 Tiku/UEMEK SIM interface connections

SIM Logic level shifting

The SIM interface can be programmed to support 3V and 1.8V SIM cards. The UEMEK contains a SIM interface

called Logic level shifting. A register in the UEMEK selects the supply voltage when the SIM interface is powered

down.

SIM Power up/down

The SIM power up/down sequence is generated in the UEMEK. This means that the UEMEK generates the reset

switch (RST) signal to the SIM. In addition, the SIMCardDet signal is connected to UEMEK. The card detection is

taken from the SIMCarDet signal, which also detects the removal of the battery. A comparator inside UEMEK does

the monitoring of the SIMCarDet signal. The comparator outputs do not alter state as long as the battery is

connected.

The SIM interface is powered up when the SIMCardDet signal indicates “card in”.

Flash

The flash programming interface uses FBUSX, FBUSRX, MBUS, VPP and BSI to connect to the baseband. The

connection goes through the UEMEK, so the logic levels correspond to 2.7 V.

12 V VPP can be used to speed up the programming. When the current is applied on the VPP-pin, the EFP-mode

activated. In this mode, 12 V is used for the internal charge pumps, instead of 2.8 V supply (VSDRAM).

System connector

The system connector is a plug and play bottom connector. It supports the fully differential DCT-4, 4-wire audio/

control interface. This includes:

• Charging

• Pads for 2-wire charging in cradles

• Audio

• 2-wire fully differiental mono audio

• 2-wire differiental microphone input

• Detection/controlling

• HeadInt passive brake switch

RM-13/33

Nokia Customer Care System Module Description

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