Sim Card Fault - Nokia NHL-10 Baseband Troubleshooting And Manual Tuning Manual

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NHL-10

Baseband Troubleshooting

CCS Technical Documentation

SIM Card Fault

The whole SIM interface is located in two chips, UPP_WD2 and UEMK. UEMK contains the

SIM interface logic level shifting. UPP_WD2 provides SIMClk through UEMK to the SIM. The

SIM interface supports both 3V and 1.8V SIMs. There is an EMIF component (3 Lines EMI fil-

ter) between the SIM card and UEMK, which isn't shown in the below picture.

Figure 12: UPP_WD2 and UEMK SIM connections

UEMK

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

erates the RST signal to the SIM. The card detection is taken from the BSI signal, which detects

the removal of the battery. Monitoring of the BSI signal is done by a comparator inside UEMK.

The threshold voltage is calculated from the battery size specifications.

First the SW attempts to power up the SIM with 1.8V. If this does not succeed, power up is re-

peated with VSIM switched to 3V.

The data communication between the card and the phone is asynchronous half duplex. The

clock supplied to the card is in GSM system 1.083MHz or 3.25MHz. The data boud rate is SIM

card clock frequency divided by 372 (by default), 64, 32 or 16.

ISSUE 2 01/2004

COMPANY CONFIDENTIAL

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