Sim Interface - Nokia RM-579 Service Manual

RM-578; RM-579
System Module
Hot swap is supported, which means that USB devices may be plugged in/out at any time.
This phone is provided with a specific connector for µUSB.

SIM interface

The device has one SIM (Subscriber Identification Module) interface. It is only accessible if battery is removed.
The SIM interface consists of an internal interface between RAP and EM ASIC AVILMA (N2200), and of an external
interface between N2200 and SIM contacts.
The SIM IF is shown in the following figure:
Figure 31 SIM interface
The EM ASIC AVILMA handles the detection of the SIM card. The detection method is based in the BSI line.
Because of the location of the SIM card, removing the battery causes a quick power down of the SIM interface.
The SIM interface supports both 1.8 V and 3.0 V SIM cards. The SIM interface voltage is first 1.8 V when the
SIM card is inserted, and if the card does not response to the ATR a 3 V interface voltage is used.
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