User Guide

Nokia Customer Care System Module
RH-37
Issue 1 07/04 Nokia Corporation Page 35
SIM
The whole SIM interface locates in UPP and UEMEK.
The interface part in the UEMEK contains power up/down, port gating, card detect, data
receiving, ATR-counter, registers and level shifting buffers logic. The SIM interface is the
electrical interface between the Subscriber Identity Module Card (SIM Card) and mobile
phone (via UEMEK device).
Both 3V and 1.8V SIM cards are supported. A register in the UEMEK selects SIM supply
voltage. It is only allowed to change the SIM supply voltage when the SIM IF is powered
down.
The SIM power up/down sequence is generated in the UEMEK. This means that the
UEMEK generates the RST signal to the SIM. In addition, the SIMCardDet signal is con-
nected to UEMEK. The card detection is taken from the BSI signal, which detects the
removal of the battery.
The data communication between the card and the phone is asynchronous half duplex.
The clock supplied to the card is in GSM system 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. The protocol
type, that is supported, is T=0 (asynchronous half-duplex character transmission as
defined in ISO 7816-3).
Figure 16: UPP/UEMEK SIM Interface Connections
Test possibility
Phoenix SIM Test
For troubleshooting, see SIM Card faults in Baseband Troubleshooting Instructions.
)
SIMIO
BSI
UEMEInt
CBusDa
CBusEnX
CBusClk
UIF Block
UEME
digital
logic
SIMIF
register
SIM
SIM
ASIP
SIMRst
SIMClk
SIMIO
From battery
type contact
VSIM
SIMClk
SIMRst
SIMIO
SIMClk
SIMRst
UPP
UEME