Figure 24 SIM interfaceThe 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 theSIM card is inserted, and if the card does not response to the ATR a 3 V interface voltage is used.μSD card interfaceThe μSD card is connected to the engine by an external level shifter and ESD protection filter. Suppliedvoltages:• VMMC: 2.85 V (from level shifter)• VIO: 1.8 V (from AVILMA)The card removal is detected by a push detect switch.RM-352; RM-354System ModuleIssue 1 COMPANY CONFIDENTIAL Page 5 –11Copyright © 2008 Nokia. All rights reserved.
