User Guide

Figure 40 Interconnections between application processor, EM ASICs, and IR module

SIM interface

The device has one SIM (Subscriber Identification Module) interface. The interface is located in two ASICs;

digital ASIC RAP contains most of the interface functionality and the mixed signal EM ASIC (N2200) takes care

of power up/down, card detect, ATR counting and level shifting.

The SIM IF is shown in the following figure:

When smart card is inserted the supplied voltage is first 1.8V. If the card does not answer with the ATR (answer

to reset) the next higher class is applied. Only 1.8V and 3V cards are supported.

EM ASIC (N2200) handles the smart card detection. Smart cards are located behind battery and the removal

of the battery causes quick power down of the cards.

RA-6

System Module

Issue 1 COMPANY CONFIDENTIAL Page 6 –13