Sim Interface - Nokia RH-6 Series Baseband Description & Troubleshooting

CCS Technical Documentation

SIM Interface

RH-6 uses a product specific SIM-card reader (SIM reader). Electrical connection of SIM
reader is similar to other DCT4 products.
The SIM interface is split between UEM and UPP (see figure below). This has been done in
order to reduce the amount of interconnections on the SIM interface between the UPP
and the UEM.
The SIM interface control logic and UART is integrated into the UPP. The SIM interface
start-up and power down sequence, including timing and reset generation is imple-
mented in UEM. The SIM interface in the UPP supports the SIM speed enhancement fea-
tures, which improves the data transfer rate in the SIM interface.
The UEM contains the SIM interface logic level shifting. UPP SIM interface logic levels
are 1.8V. The SIM interface can be programmed to support 3V and 1.8V SIMs. A 5V SIM
interface is not supported. A register in the UEM selects the 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 UEM. The Battery Type contact sig-
nal (BSI) is used to recognize if the battery suddenly is removed from the transceiver
block. The SIMCardDet is not used. If the BSI goes low, the power down sequence is
automatic initiated. The SIMIF will then force all the connections low, i.e. SIMRST, SIM-
CLK, SIMDATA and VSIM. A comparator inside the UEM does the monitoring of the BSI
signal. The comparator offset is such that the comparator output does not alter state as
long as the battery is connected. The BSI comparator threshold level is 2.1 V with 75 mV
hysteresis.
Issue 1 10/2003
Company Confidential
Figure 17: UPP, UEM and SIM Connections
© 2003 Nokia Corporation.
6 - BB Description & Troubleshooting
RH-6
Page 31