Sim Interface; Microsd Card Interface - Nokia RM-645 Service Manual

SIM interface

The phone has a SIM (Subscriber Identification Module) interface including a SIM connector. The connector
is only accessible when the battery is removed.
The SIM interface consists of an internal interface between RAPU and EM ASIC (N2200), and an external
interface between EM ASIC and SIM contacts.
The EM ASIC handles the detection of the SIM card. The detection method is based on the BSI line. Because of
the location of the SIM connector, removing the battery causes a quick power down of the SIM interface.
The SIM interface supports both 1.8V and 3.0V SIM cards. The SIM interface voltage is first 1.8 V when the SIM
card is inserted, and if the card does not respond to the ATR (Answer to Request), a 3V interface voltage is
used.

MicroSD card interface

The microSD card interface has one internal interface between RAPU and EM ASIC and one external interface
between EM ASIC and the microSD card. The microSD card connector is mounted on the main PWB.
The µSD removal detection switch is inside the card sockect.
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Figure 36 SIM interface
Figure 37 MicroSD card interface
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RM-645
System Module
Issue 1