Cinterion
®
EMS31-US Hardware Interface Overview
2.1 Application Interface
17
EMS31_US_HIO_v00.103
2017-11-27
Confidential / Preliminary
Page 11 of 33
2.1.3
UICC/SIM/USIM Interface
EMS31-US has two identical integrated UICC/SIM/USIM interfaces compatible with the 3GPP
31.102 and ETSI 102 221. These two interfaces are mutually exclusive, meaning that only one
UICC/SIM/USIM interface can be used at a time. This interface is wired to the host interface in
order to be connected to an external SIM card holder. Five pads on the SMT application inter-
face are reserved for each SIM interface.
The UICC/SIM/USIM interface supports 3V and 1.8V SIM cards.
The CCINx signal serves to detect whether a tray (with SIM card) is present in the card holder.
The CCINx signal must be connected to V180 for the detection to work on the module. Other-
wise the SIM card can never be detected by the module.
Using the CCINx signal is mandatory for compliance with the GSM 11.11 recommendation if
the mechanical design of the host application allows the user to remove the SIM card during
operation. To take advantage of this feature, an appropriate SIM card detect switch is required
on the card holder. For example, this is true for the model supplied by Molex, which has been
tested to operate with EMS31-US and is part of the Gemalto M2M reference equipment sub-
mitted for type approval. See
Section 7.1
for Molex ordering numbers.
Note: No guarantee can be given, nor any liability accepted, if loss of data is encountered after
removing the SIM card during operation. Also, no guarantee can be given for properly initializ-
ing any SIM card that the user inserts after having removed the SIM card during operation. In
this case, the application must restart EMS31-US.
Table 1:
Signals of the SIM interface (SMT application interface)
Signal
Description
GND
Separate ground connection for SIM card to improve EMC.
CCCLKx Chipcard clock
CCVCCx SIM supply voltage.
CCIOx
Serial data line, input and output.
CCRSTx Chipcard reset
CCINx
Input on the baseband processor for detecting a SIM card tray in the holder. If the SIM is
removed during operation the SIM interface is shut down immediately to prevent destruc-
tion of the SIM. The CCINx signal is by default low and will change to high level if a SIM
card is inserted.
The CCINx signal is mandatory for applications that allow the user to remove the SIM card
during operation.
The CCINx signal is solely intended for use with a SIM card. It must not be used for any
other purposes. Failure to comply with this requirement may invalidate the type approval of
EMS31-US.
Pull-down 220k resistor is mandatory.
