User Guide

The EM ASIC 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 IF.

The EM ASIC SIM1 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.

µSD card interface

The µSD card is connected to the engine by an external level shifter with an ESD protection filter. Supplied

voltages:

• VSD: 2.85 V (from level shifter)

• VIO: 1.8 V (from AVILMA)

The uSD card reader has two switches: card_detection and pre_warning. This enables hot swapping, which

means that the card may be plugged in/out at any time, without removing the battery.

RM-244

System Module and User Interface

Page 6 –16 COMPANY CONFIDENTIAL Issue 1