User Guide

ISSUE 1 09/2004 COMPANY CONFIDENTIAL 29

RH-53/54

8-System Module Nokia Customer Care

SIM -reader

The SIM card reader is located on upper block part of the phone and is connected to UEM via

the flex. For RH-53 a slide-in draw is used as SIM slot. Picture below depicts the SIM slot on

the side of the upper block.

Figure 10:Upper block B-cover SIM-slide slot

The entire SIM interface is located in the two ASICs, UPP and UEM. The UEM contains the

SIM interface logic level shifting. The SIM interface can be programmed to support 3V and 1.8V

SIMs. A register in the UEM controlled by SW is used to selects SIM supply voltage for different

SIMs. However, it is only allowed to change the SIM supply voltage when the SIM IF is initial-

ised i.e. SIM IF id powered down.

Of the eight card contacts only 5 will be connected: C1 (Vcc), C2 (Card Reset), C3 (Card

Clock), C5 (Ground) and C7 (Data I/O).

SIM switch and card detection

The SIM power up/down sequence is generated in the UEM. This means that the UEM gener-

ates the RST signal to the SIM. A mechanical switch is connected to UEM SimCardDet pin to

monitor the presence of the SIM card, i.e. card detection. When the SIM card is inserted, the

switch connects the SimCardDet to GND.

To avoid probable SIM card corruption caused by “hot-swapping”, the UEM will automatically

power down the SIM card interface within 2ms if the switch is opened.