Sim Card - Nokia NHL-2NA Series Troubleshooting Instructions

NHL-2NA

SIM card

The whole SIM interface locates in two chips UPP_WD2 and UEM. UEM contains the SIM
interface logic level shifting. UPP provides SIMClk through UEM to the SIM. SIM inter-
face supports both 3 V and 1.8 V SIMs. There is an EMI component on lg4 between the
sim card and UEM which isn't shown in the below picture. One pullup resistor is also on
board at simdata line, which isn't shown in the picture.
SIM
C5 C6 C7
C1 C2 C3
BSI line from battery
The SIM-power up/down sequence is generated in the UEM. This means that the UEM
generates the RST signal to the SIM. Also the SIMCardDet signal is connected to UEM.
First the SW attempts to power up the SIM with 1.8 V. If this does not succeed power up
is repeated with VSIM switched to 3 V.
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
baudrate is SIM card clock frequency divided by 372 (by default), 64, 32 or 16.
Page 38
Figure 13: UPP WD2 & UEM SIM connections
GND
SIMDATA
SIMCLK
SIMRST
VSIM
UEM
SIMIF
register
BSI
¤Nokia Corporation
CCS Technical Documentation
SIMIO
SIMIO
SIMClk SIMClk
Data
Data
UIF Block
UEMInt
UEM
digital
CBusDa
logic
CBusEnX
CBusClk
GND
UPP
Issue 1 07/02