Issue 2 06/2005
COMPANY CONFIDENTIAL
29
Copyright © 2005 Nokia. All Rights Reserved.
RH-53/54
8-System Module
Nokia Customer Care
■
SIM Interface
The SIM interface can be described as electrical interface between the SIM card and the phone
via UEM. The SIM interface in the UEM contains power up/down, port gating, card detect, data
receiving, ATR-counter, registers and level shifting buffers logic.
Figure 9:UEM, UPP and SIM interface
The data communication between the card and the phone is asynchronous half duplex. The
clock supplied to the card in GSM system is either 1.083 MHz or 3.25 MHz. The data baud rate
is SIM card clock frequency divided by 372 (by default), 64, 32 or 16.
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).
UEM
UPP
SIMIO
SIMclk
SIMR
SIMIO
SIMclk
SIMRST
SIM IF
Register
UEM
Digital
Logic
UIF block
UEM int
Cbus Da
Cbus enX
Cbus clk
SIMclk
SIMRST
VSIM
SIMIO
Passive
filter
C4
C3
C2
C1
C5
C6
C7
C8
SIM Card
SimCardDet